Respiratory electron transport, ATP synthesis by chemiosmotic coupling, and heat production by uncoupling proteins. (Homo sapiens)

From WikiPathways

Revision as of 16:40, 31 October 2018 by ReactomeTeam (Talk | contribs)
Jump to: navigation, search
386, 10-12, 15...8, 9, 19, 31, 448, 4414, 18, 3638194417, 2021, 228, 44388, 44198, 44124, 4528, 4440, 4540, 4526, 3016, 378, 448, 4440, 4540, 4540, 453-5, 7, 29...8, 44mitochondrial intermembrane spacemitochondrial matrixATPNDUFAB1 MT-ND1 NDUFB2 NDUFC1 NDUFB6 ACAD9 NDUFAF6 NDUFS3 NDUFA2 NDUFB10 ATP5F1 4Fe-4S COX7B NDUFS6 NDUFAF3 NDUFB2 NDUFB7 SDHB 4Fe-4S NDUFAF4 NDUFAF3 F1Fo ATP synthaseMT-ND2 4Fe-4S UCP3 Ubiquinol-cytochromec reductaseTACO1 NDUFS3 SURF1 NDUFS1:2x4Fe-4SNDUFS7 NDUFA2 NDUFC2 LCFA4Fe-4S ACAD9 NDUFS7 NDUFAF3 NDUFS2 NDUFA6 4Fe-4S NDUFS1 ATP5O NDUFA7 NDUFB11 NDUFC1 MT-ND2 NDUFB1 ATP5I NDUFB4 NDUFA10 NDUFAF7 ETFDHMT-CO3 NAD+370 kDa subcomplexNDUFA12 NDUFAF7 ATP5E ATP5O NDUFA2 ACAD9 NDUFC2 NDUFB1 MT-ND4 H+NDUFB10 UCP dimerUQCRC2 NDUFB2 MT-CYB ATP MT-ND2 FAD NDUFS3 H+NDUFAF2 NDUFAB1 Fatty Acid anion "head-out" 980kDa complexMT-ND1 NDUFA3 ATP5C1 NDUFB5 ATP5L ATP5G3 550kDa complexNDUFS3ETF:FADH2COX6C(3-75) NDUFV3UCP dimerNDUFB9 NDUFS7 NDUFAB1 FAD PiNDUFS5 NDUFA4 FAD 4Fe-4S NDUFS3 MT-ND3 NDUFA9:FADFMN NDUFB1 ATP5J NDUFB7 NDUFAF5 O2NDUFA1 ATP5F1 NDUFV1 NDUFA6 UQCR10 SDHA CuA Iron Sulphur Cluster FADH2 H+H+NDUF subunitsATP5A1 NDUFA8 NDUFAF5MCIA complexMT-ATP6 4Fe-4S NDUFB6 ETFA(1-?) CYCS NDUFA5 NDUFB11 LRPPRC ferriheme FAD FA anion:UCP dimer "head-out" complexNDUFB3 FAD ATPase:ATPferriheme TIMMDC1 NDUFB4 H+NDUFS1 FP subcomplexTMEM126B ATP5B UQCRC1 NDUFA6 ATP5D UCP3 NDUFAF2 NDUFS2 NDUFA9 MT-ND6 NDUFS1 NDUFA9 NDUFC2 Fatty Acid "head-in"NDUFA1 NDUFB6NDUFB2 NDUFS2 NDUFS6 COX18 NDUFA3 4Fe-4S NDUFAB1 FAD NDUFAF4 TIMMDC1 NDUFAB1 NDUFA11 NUBPLNDUFB10 COX7A2L ACAD9 H2ONDUFB8 QH2NDUFS5NDUFA3 ATP5B 4Fe-4SATP5F1 NDUFC2 NDUFA3 NDUFB1 NDUFA7 NDUFA5 NDUFS7 NDUFB2 NDUFA5 NDUFS5 NDUFB5 NDUFS7 4Fe-4S CoQNDUFA5 NDUFB4 NDUFB9 NDUFAF6 NDUFAB1 NDUFB4 NDUFAF1 COX6B1 NDUFB4 SLC25A27 SLC25A14 NDUFS3 Fatty Acid anion"head-in"UCP3 NDUFS2 NDUFA9 MT-ND6NDUFB1 FAD ETFB FAD NDUFS8 CoQNDUFA10 SDHB ATP5J2 NDUFS8 NDUFA11 NDUFAF3 4Fe-4S TIMMDC1NUBPL:4Fe-4SATP5I NDUFB8 NDUFB4 NDUFV1:4Fe-4S:FMNATP GDP NDUFS2 NDUFB7 NDUFA5 MT-ATP8 NDUFC1 MT-CO1 HP subcomplexGTP MT-ND4 NDUFA2 NDUFA6 NDUFAF5 FAD NDUFA9 FADNDUFAF6 FADH2NDUFAF4 TMEM126B NDUFC1 NDUFA7 NDUFB4 NDUFS8 Intermediate 2NDUFA10 TRAP1ATP5E ETF:FADNDUFV1 NDUFA7 NDUFB7 CYC1 Succinatedehydrogenasecomplex (reduced)NDUFA9 NDUFB11 CYCS NDUFS1 NDUFA10 MT-ATP6 ATP5B MT-ND6 SLC25A14 NDUFA3 TMEM126B 4Fe-4S NDUFS4 MT-ND24Fe-4S ATP5G1 FAD H+NDUFA9 NDUFA13 NDUFB7 NDUFA8 ATP5A1 ATP5S NDUFS2 Fatty Acid anion "head-in" CoQCOX4I1 NDUFS7 NDUFB3 SLC25A27 NDUFA8 4Fe-4S NDUFB3 NDUFB2 UQCRQ ADP NDUFB7 ATP5G3 COX5B NDUFAF5 NDUFA2 ATP5H NDUFS8 COQ10B NDUFA7 ATP5S ATP5G1 MT-ND6 NDUFAF3COX16 NDUFV2 ETFB NDUFA12NDUFAF3 UQCRH TIMMDC1 NDUFB5 ATP5A1 NDUFA11 NDUFAF7 NDUFB1 NDUFAF7 TMEM126B NDUFS3 NDUFA8 MT-ND3 NDUFS4NDUFV2 Fatty Acid"head-out"Heme 1 cytochrome c1 cofactor ATP5C1 NDUFS6ETFA(1-?) FMNNDUFB6 NDUFB3 NDUFV3 QH2NDUFB5 H+SCO1 NDUFA13 NDUFS7 NDUFA5 MT-ND5 NDUFB3 FAD NDUFAF3 Mitochondrial FattyAcid Beta-OxidationFAD NDUFA7 MT-ND2 NDUFV2NDUFS7 COX7C SLC25A27 FAD NDUFS8 NDUFA13 AMP NDUF:4Fe-4S subunitsSDHD Cytochrome c(reduced)NDUFB8 FMN NDUFB10 ECSIT NDUFA2 MT-ND3 NDUFAF4 Heme 2 cytochrome c1 cofactor NDUFB8 FAD MT-ND5 NDUFA7 NDUFA10 NDUFA10 4Fe-4S ACAD9 NDUFB5 AMP FAD ECSIT NDUFB5 Cytochrome c(oxidised)TIMMDC1 Ketone bodymetabolismNDUFA6 NDUFS7 NDUFA11 ATPase:ADP:Piferroheme NDUFA6 COX11,14,16,18,20H2OADPNDUFS8 SDHA FAD NDUFB6 NDUFA9 NDUFB8 ATP5E SDH complex (ox.)NDUFS2 NDUFS2 TMEM126B COX ancilliaryproteinsATP5J NDUFS2 UCP3 4Fe-4S NDUFA8 MT-ND4 815kDa complexNDUFB9 NDUFAF1 NDUFA11 ATP5L ATP5G2 UCP2 NDUFS6 NDUFS8 SDHC 4Fe-4S ECSIT Complex IIron Sulphur Cluster NDUFC1 NDUFB8 NDUFS8 4Fe-4S SLC25A14 NDUFS3 NDUFA13 SLC25A14 MT-ND1 ATP5J2 NDUFB9 NDUFB9 NDUFB11 NDUFA12 NDUFAF7 NDUFS3 ATP5C1 NDUFS4 MT-CO2 NUBPL ATP5G3 NDUFB7 MT-ATP8 SCO2 NDUFS8 NDUFA12 NDUFA13 NDUFC2 FA anion:UCP dimer"head-in" complexNDUFA1 NDUFB5 UCP2 Fatty Acid anion"head-out"UCP1 4Fe-4S CoQNDUFA2 UQCR11 NDUFS8 NDUFC2 NDUFAF5 NDUFB6 Cytochrome c oxidaseIP subcomplexNDUFB11 COX11 NDUFB9 ATP5G2 UCP1 H+MT-ND1NDUFB3 NDUFA5 MT-ND6 ATP5D 4Fe-4S COX19NDUFA13 NDUFB8 NDUFS1 NDUFA1 NDUFAF7 NDUFV2 NDUFC1 Intermediate 1ATP5G1 UCP2 NDUFB3 NDUFB11 NDUFS8 ATP5H NDUFC2 NDUFAF6 FAD NDUFAB1 ATP5S ATP5J2 NDUFB1 NDUFA1 SLC25A27 Cytochrome c(oxidised)NDUFA9 TIMMDC1 COX6A1 NDUFV3 ATP5H MT-ND1 NDUFB10 Pi FAD ATP5O NDUFA11 UQCRFS1(79-274) NDUFA9 SDHC QH2NDUFAF7 NDUFAF4NDUFV1 COQ10A,BHeme bL MT-ND3 NDUFA6 NDUFA10 NDUFA8 4Fe-4S MT-ATP8 MT-ND5NDUFAF7FMN NDUFV2:4Fe-4SCOQ10A H+NDUFS7 MT-ND3315kDa subcomplexTIMMDC1 NDUFA8 NDUFA1 NDUFB9 NDUFAF2ATP5I MT-ND6 NDUFB2 NDUFB10 Purine nucleotideNDUFAF4 NDUFA3 NDUFV1NDUFAF7 COX8A NDUFC1 COX5A NDUFS4 SDHD UCP1 NDUFAF4 MT-ND4FMN UQCRB ATP5L NDUFAF1 NDUFS2 NDUFAF6ATP5J NDUFV2 MT-ND2 NDUFS2 COX20 ATP5G2 ATP5D NDUFA11 NDUFS1 NDUFS7:4Fe-4SNDUFS7 NADHCYCS FADH2 COX14 MT-ND1 MT-ND5 NDUFA13 NDUFV1 NDUFB11 MT-ATP6 MT-ND3 ADP NDUFA3 NDUFAF1 NDUFB10 ECSIT UCP1 2Fe-2S ECSIT NDUFV3 NDUFS8:2x4Fe-4SUCP2 NDUFAF7:NDUFS2:2x4Fe-4SNDUFA1 NDUFAF1 23, 272, 32, 39, 4113


Description

Oxidation of fatty acids and pyruvate in the mitochondrial matrix yield large amounts of NADH. The respiratory electron transport chain couples the re-oxidation of this NADH to NAD+ to the export of protons from the mitochonrial matrix, generating a chemiosmotic gradient across the inner mitochondrial membrane. This gradient is used to drive the synthesis of ATP; it can also be bypassed by uncoupling proteins to generate heat, a reaction in brown fat that may be important in regulation of body temperature in newborn children. View original pathway at:Reactome.

Comments

Reactome-Converter 
Pathway is converted from Reactome ID: 163200
Reactome-version 
Reactome version: 63
Reactome Author 
Reactome Author: Jassal, Bijay

Try the New WikiPathways

View approved pathways at the new wikipathways.org.

Quality Tags

Ontology Terms

 

Bibliography

View all...
  1. Stanley CA, Hale DE.; ''Genetic disorders of mitochondrial fatty acid oxidation.''; PubMed Europe PMC Scholia
  2. Allan CM, Hill S, Morvaridi S, Saiki R, Johnson JS, Liau WS, Hirano K, Kawashima T, Ji Z, Loo JA, Shepherd JN, Clarke CF.; ''A conserved START domain coenzyme Q-binding polypeptide is required for efficient Q biosynthesis, respiratory electron transport, and antioxidant function in Saccharomyces cerevisiae.''; PubMed Europe PMC Scholia
  3. Yoshida S, Tsutsumi S, Muhlebach G, Sourbier C, Lee MJ, Lee S, Vartholomaiou E, Tatokoro M, Beebe K, Miyajima N, Mohney RP, Chen Y, Hasumi H, Xu W, Fukushima H, Nakamura K, Koga F, Kihara K, Trepel J, Picard D, Neckers L.; ''Molecular chaperone TRAP1 regulates a metabolic switch between mitochondrial respiration and aerobic glycolysis.''; PubMed Europe PMC Scholia
  4. Fontanesi F, Soto IC, Horn D, Barrientos A.; ''Assembly of mitochondrial cytochrome c-oxidase, a complicated and highly regulated cellular process.''; PubMed Europe PMC Scholia
  5. Boyer PD, Cross RL, Momsen W.; ''A new concept for energy coupling in oxidative phosphorylation based on a molecular explanation of the oxygen exchange reactions.''; PubMed Europe PMC Scholia
  6. Hirst J, Carroll J, Fearnley IM, Shannon RJ, Walker JE.; ''The nuclear encoded subunits of complex I from bovine heart mitochondria.''; PubMed Europe PMC Scholia
  7. Barros MH, Johnson A, Gin P, Marbois BN, Clarke CF, Tzagoloff A.; ''The Saccharomyces cerevisiae COQ10 gene encodes a START domain protein required for function of coenzyme Q in respiration.''; PubMed Europe PMC Scholia
  8. Balsa E, Marco R, Perales-Clemente E, Szklarczyk R, Calvo E, Landázuri MO, Enríquez JA.; ''NDUFA4 is a subunit of complex IV of the mammalian electron transport chain.''; PubMed Europe PMC Scholia
  9. Mitchell P.; ''Protonmotive redox mechanism of the cytochrome b-c1 complex in the respiratory chain: protonmotive ubiquinone cycle.''; PubMed Europe PMC Scholia
  10. Wikstrom MK.; ''Proton pump coupled to cytochrome c oxidase in mitochondria.''; PubMed Europe PMC Scholia
  11. Yano T.; ''The energy-transducing NADH: quinone oxidoreductase, complex I.''; PubMed Europe PMC Scholia
  12. Wood PA.; ''Defects in mitochondrial beta-oxidation of fatty acids.''; PubMed Europe PMC Scholia
  13. Loeffen J, Elpeleg O, Smeitink J, Smeets R, Stöckler-Ipsiroglu S, Mandel H, Sengers R, Trijbels F, van den Heuvel L.; ''Mutations in the complex I NDUFS2 gene of patients with cardiomyopathy and encephalomyopathy.''; PubMed Europe PMC Scholia
  14. Belogrudov GI, Hatefi Y.; ''Factor B and the mitochondrial ATP synthase complex.''; PubMed Europe PMC Scholia
  15. Rinaldo P, Matern D, Bennett MJ.; ''Fatty acid oxidation disorders.''; PubMed Europe PMC Scholia
  16. Sciacovelli M, Guzzo G, Morello V, Frezza C, Zheng L, Nannini N, Calabrese F, Laudiero G, Esposito F, Landriscina M, Defilippi P, Bernardi P, Rasola A.; ''The mitochondrial chaperone TRAP1 promotes neoplastic growth by inhibiting succinate dehydrogenase.''; PubMed Europe PMC Scholia
  17. Trumpower BL, Gennis RB.; ''Energy transduction by cytochrome complexes in mitochondrial and bacterial respiration: the enzymology of coupling electron transfer reactions to transmembrane proton translocation.''; PubMed Europe PMC Scholia
  18. Stiburek L, Hansikova H, Tesarova M, Cerna L, Zeman J.; ''Biogenesis of eukaryotic cytochrome c oxidase.''; PubMed Europe PMC Scholia
  19. Schultz BE, Chan SI.; ''Structures and proton-pumping strategies of mitochondrial respiratory enzymes.''; PubMed Europe PMC Scholia
  20. Garlid KD, Jaburek M, Jezek P.; ''Mechanism of uncoupling protein action.''; PubMed Europe PMC Scholia
  21. Belogrudov GI.; ''Factor B is essential for ATP synthesis by mitochondria.''; PubMed Europe PMC Scholia
  22. Roe CR, Roe DS.; ''Recent developments in the investigation of inherited metabolic disorders using cultured human cells.''; PubMed Europe PMC Scholia
  23. Loeffen JL, Triepels RH, van den Heuvel LP, Schuelke M, Buskens CA, Smeets RJ, Trijbels JM, Smeitink JA.; ''cDNA of eight nuclear encoded subunits of NADH:ubiquinone oxidoreductase: human complex I cDNA characterization completed.''; PubMed Europe PMC Scholia
  24. Long JZ, Svensson KJ, Bateman LA, Lin H, Kamenecka T, Lokurkar IA, Lou J, Rao RR, Chang MR, Jedrychowski MP, Paulo JA, Gygi SP, Griffin PR, Nomura DK, Spiegelman BM.; ''The Secreted Enzyme PM20D1 Regulates Lipidated Amino Acid Uncouplers of Mitochondria.''; PubMed Europe PMC Scholia
  25. Estornell E, Fato R, Castelluccio C, Cavazzoni M, Parenti Castelli G, Lenaz G.; ''Saturation kinetics of coenzyme Q in NADH and succinate oxidation in beef heart mitochondria.''; PubMed Europe PMC Scholia
  26. Soto IC, Fontanesi F, Liu J, Barrientos A.; ''Biogenesis and assembly of eukaryotic cytochrome c oxidase catalytic core.''; PubMed Europe PMC Scholia
  27. Echtay KS, Roussel D, St-Pierre J, Jekabsons MB, Cadenas S, Stuart JA, Harper JA, Roebuck SJ, Morrison A, Pickering S, Clapham JC, Brand MD.; ''Superoxide activates mitochondrial uncoupling proteins.''; PubMed Europe PMC Scholia
  28. Kevelam SH, Rodenburg RJ, Wolf NI, Ferreira P, Lunsing RJ, Nijtmans LG, Mitchell A, Arroyo HA, Rating D, Vanderver A, van Berkel CG, Abbink TE, Heutink P, van der Knaap MS.; ''NUBPL mutations in patients with complex I deficiency and a distinct MRI pattern.''; PubMed Europe PMC Scholia
  29. Schuelke M, Loeffen J, Mariman E, Smeitink J, van den Heuvel L.; ''Cloning of the human mitochondrial 51 kDa subunit (NDUFV1) reveals a 100% antisense homology of its 3'UTR with the 5'UTR of the gamma-interferon inducible protein (IP-30) precursor: is this a link between mitochondrial myopathy and inflammation?''; PubMed Europe PMC Scholia
  30. Garlid KD, Orosz DE, Modrianský M, Vassanelli S, Jezek P.; ''On the mechanism of fatty acid-induced proton transport by mitochondrial uncoupling protein.''; PubMed Europe PMC Scholia
  31. Pitceathly RD, Rahman S, Wedatilake Y, Polke JM, Cirak S, Foley AR, Sailer A, Hurles ME, Stalker J, Hargreaves I, Woodward CE, Sweeney MG, Muntoni F, Houlden H, Taanman JW, Hanna MG, UK10K Consortium.; ''NDUFA4 mutations underlie dysfunction of a cytochrome c oxidase subunit linked to human neurological disease.''; PubMed Europe PMC Scholia
  32. Smeitink J, Sengers R, Trijbels F, van den Heuvel L.; ''Human NADH:ubiquinone oxidoreductase.''; PubMed Europe PMC Scholia
  33. Mckenzie M, Ryan MT.; ''Assembly factors of human mitochondrial complex I and their defects in disease.''; PubMed Europe PMC Scholia
  34. Andrews B, Carroll J, Ding S, Fearnley IM, Walker JE.; ''Assembly factors for the membrane arm of human complex I.''; PubMed Europe PMC Scholia
  35. Jezek P, Hanus J, Semrad C, Garlid KD.; ''Photoactivated azido fatty acid irreversibly inhibits anion and proton transport through the mitochondrial uncoupling protein.''; PubMed Europe PMC Scholia
  36. Bourges I, Ramus C, Mousson de Camaret B, Beugnot R, Remacle C, Cardol P, Hofhaus G, Issartel JP.; ''Structural organization of mitochondrial human complex I: role of the ND4 and ND5 mitochondria-encoded subunits and interaction with prohibitin.''; PubMed Europe PMC Scholia
  37. Mimaki M, Wang X, McKenzie M, Thorburn DR, Ryan MT.; ''Understanding mitochondrial complex I assembly in health and disease.''; PubMed Europe PMC Scholia
  38. Sass JO.; ''Inborn errors of ketogenesis and ketone body utilization.''; PubMed Europe PMC Scholia
  39. Sheftel AD, Stehling O, Pierik AJ, Netz DJ, Kerscher S, Elsässer HP, Wittig I, Balk J, Brandt U, Lill R.; ''Human ind1, an iron-sulfur cluster assembly factor for respiratory complex I.''; PubMed Europe PMC Scholia
  40. Carilla-Latorre S, Gallardo ME, Annesley SJ, Calvo-Garrido J, Graña O, Accari SL, Smith PK, Valencia A, Garesse R, Fisher PR, Escalante R.; ''MidA is a putative methyltransferase that is required for mitochondrial complex I function.''; PubMed Europe PMC Scholia
  41. MacLennan DH, Lenaz G, Szarkowska L.; ''Studies on the mechanims of oxidative phosphorylation. IX. Effect of cytochrome c on energy-linked processes.''; PubMed Europe PMC Scholia
  42. Mitchell P.; ''Possible molecular mechanisms of the protonmotive function of cytochrome systems.''; PubMed Europe PMC Scholia
  43. Coates PM, Tanaka K.; ''Molecular basis of mitochondrial fatty acid oxidation defects.''; PubMed Europe PMC Scholia
  44. Echtay KS, Murphy MP, Smith RA, Talbot DA, Brand MD.; ''Superoxide activates mitochondrial uncoupling protein 2 from the matrix side. Studies using targeted antioxidants.''; PubMed Europe PMC Scholia
  45. Friedrich T, Böttcher B.; ''The gross structure of the respiratory complex I: a Lego System.''; PubMed Europe PMC Scholia
  46. Guzzo G, Sciacovelli M, Bernardi P, Rasola A.; ''Inhibition of succinate dehydrogenase by the mitochondrial chaperone TRAP1 has anti-oxidant and anti-apoptotic effects on tumor cells.''; PubMed Europe PMC Scholia

History

View all...
CompareRevisionActionTimeUserComment
114966view16:49, 25 January 2021ReactomeTeamReactome version 75
113410view11:48, 2 November 2020ReactomeTeamReactome version 74
112612view15:59, 9 October 2020ReactomeTeamReactome version 73
101528view11:39, 1 November 2018ReactomeTeamreactome version 66
101063view21:21, 31 October 2018ReactomeTeamreactome version 65
100594view19:55, 31 October 2018ReactomeTeamreactome version 64
100143view16:40, 31 October 2018ReactomeTeamreactome version 63
99693view15:09, 31 October 2018ReactomeTeamreactome version 62 (2nd attempt)
99281view12:45, 31 October 2018ReactomeTeamreactome version 62
93907view13:44, 16 August 2017ReactomeTeamreactome version 61
93481view11:24, 9 August 2017ReactomeTeamreactome version 61
86578view09:21, 11 July 2016ReactomeTeamreactome version 56
83426view11:11, 18 November 2015ReactomeTeamVersion54
81630view13:10, 21 August 2015ReactomeTeamVersion53
77091view08:38, 17 July 2014ReactomeTeamFixed remaining interactions
76797view12:18, 16 July 2014ReactomeTeamFixed remaining interactions
76120view10:18, 11 June 2014ReactomeTeamRe-fixing comment source
75832view11:40, 10 June 2014ReactomeTeamReactome 48 Update
75192view09:40, 9 May 2014AnweshaFixing comment source for displaying WikiPathways description
74837view10:06, 30 April 2014ReactomeTeamReactome46
74431view07:10, 19 April 2014EgonwRelocated an InfoBox.
68937view17:34, 8 July 2013MaintBotUpdated to 2013 gpml schema
45047view19:09, 6 October 2011ThomasOntology Term : 'energy metabolic pathway' added !
42118view21:58, 4 March 2011MaintBotAutomatic update
39928view05:56, 21 January 2011MaintBotNew pathway

External references

DataNodes

View all...
NameTypeDatabase referenceComment
2Fe-2S R-ALL-164296 (Reactome)
315kDa subcomplexComplexR-HSA-6799189 (Reactome)
370 kDa subcomplexComplexR-HSA-6799190 (Reactome)
4Fe-4S R-ALL-164292 (Reactome)
4Fe-4S R-ALL-169274 (Reactome)
4Fe-4SR-ALL-169274 (Reactome)
550kDa complexComplexR-HSA-6799176 (Reactome)
815kDa complexComplexR-HSA-6799187 (Reactome)
980kDa complexComplexR-HSA-6799183 (Reactome)
ACAD9 ProteinQ9H845 (Uniprot-TrEMBL)
ADP MetaboliteCHEBI:16761 (ChEBI)
ADPMetaboliteCHEBI:16761 (ChEBI)
AMP MetaboliteCHEBI:16027 (ChEBI)
ATP MetaboliteCHEBI:15422 (ChEBI)
ATP5A1 ProteinP25705 (Uniprot-TrEMBL)
ATP5B ProteinP06576 (Uniprot-TrEMBL)
ATP5C1 ProteinP36542 (Uniprot-TrEMBL)
ATP5D ProteinP30049 (Uniprot-TrEMBL)
ATP5E ProteinP56381 (Uniprot-TrEMBL)
ATP5F1 ProteinP24539 (Uniprot-TrEMBL)
ATP5G1 ProteinP05496 (Uniprot-TrEMBL)
ATP5G2 ProteinQ06055 (Uniprot-TrEMBL)
ATP5G3 ProteinP48201 (Uniprot-TrEMBL)
ATP5H ProteinO75947 (Uniprot-TrEMBL)
ATP5I ProteinP56385 (Uniprot-TrEMBL)
ATP5J ProteinP18859 (Uniprot-TrEMBL)
ATP5J2 ProteinP56134 (Uniprot-TrEMBL)
ATP5L ProteinO75964 (Uniprot-TrEMBL)
ATP5O ProteinP48047 (Uniprot-TrEMBL)
ATP5S ProteinQ99766 (Uniprot-TrEMBL)
ATPMetaboliteCHEBI:15422 (ChEBI)
ATPase:ADP:PiComplexR-HSA-164838 (Reactome)
ATPase:ATPComplexR-HSA-164835 (Reactome)
COQ10A ProteinQ96MF6 (Uniprot-TrEMBL)
COQ10A,BComplexR-HSA-8933103 (Reactome)
COQ10B ProteinQ9H8M1 (Uniprot-TrEMBL)
COX ancilliary proteinsComplexR-HSA-5566488 (Reactome)
COX11 ProteinQ9Y6N1 (Uniprot-TrEMBL)
COX11,14,16,18,20ComplexR-HSA-5336143 (Reactome)
COX14 ProteinQ96I36 (Uniprot-TrEMBL)
COX16 ProteinQ9P0S2 (Uniprot-TrEMBL)
COX18 ProteinQ8N8Q8 (Uniprot-TrEMBL)
COX19ProteinQ3E731 (Uniprot-TrEMBL)
COX20 ProteinQ5RI15 (Uniprot-TrEMBL)
COX4I1 ProteinP13073 (Uniprot-TrEMBL)
COX5A ProteinP20674 (Uniprot-TrEMBL)
COX5B ProteinP10606 (Uniprot-TrEMBL)
COX6A1 ProteinP12074 (Uniprot-TrEMBL)
COX6B1 ProteinP14854 (Uniprot-TrEMBL)
COX6C(3-75) ProteinP09669 (Uniprot-TrEMBL)
COX7A2L ProteinO14548 (Uniprot-TrEMBL)
COX7B ProteinP24311 (Uniprot-TrEMBL)
COX7C ProteinP15954 (Uniprot-TrEMBL)
COX8A ProteinP10176 (Uniprot-TrEMBL)
CYC1 ProteinP08574 (Uniprot-TrEMBL)
CYCS ProteinP99999 (Uniprot-TrEMBL)
CoQMetaboliteCHEBI:46245 (ChEBI)
Complex IComplexR-HSA-6799192 (Reactome)
CuA MetaboliteCHEBI:28694 (ChEBI)
Cytochrome c (oxidised)ComplexR-HSA-352607 (Reactome)
Cytochrome c (reduced)ComplexR-HSA-352609 (Reactome)
Cytochrome c oxidaseComplexR-HSA-164316 (Reactome)
ECSIT ProteinQ9BQ95 (Uniprot-TrEMBL)
ETF:FADH2ComplexR-HSA-169268 (Reactome)
ETF:FADComplexR-HSA-169267 (Reactome)
ETFA(1-?) ProteinP13804 (Uniprot-TrEMBL)
ETFB ProteinP38117 (Uniprot-TrEMBL)
ETFDHProteinQ16134 (Uniprot-TrEMBL)
F1Fo ATP synthaseComplexR-HSA-74186 (Reactome) Mitochondrial ATP synthase subunit s (ATP5S) appears to be an essential subunit necessary for H+ conduction of ATP synthase (Belogrudov & Hatefi 2002, Belogrudov 2002).
FA anion:UCP dimer "head-in" complexComplexR-HSA-166218 (Reactome)
FA anion:UCP dimer "head-out" complexComplexR-HSA-166385 (Reactome)
FAD MetaboliteCHEBI:16238 (ChEBI)
FADMetaboliteCHEBI:16238 (ChEBI)
FADH2 MetaboliteCHEBI:17877 (ChEBI)
FADH2MetaboliteCHEBI:17877 (ChEBI)
FMN MetaboliteCHEBI:17621 (ChEBI)
FMNMetaboliteCHEBI:17621 (ChEBI)
FP subcomplexComplexR-HSA-5689686 (Reactome)
Fatty Acid "head-out"MetaboliteCHEBI:35366 (ChEBI)
Fatty Acid "head-in"MetaboliteCHEBI:35366 (ChEBI)
Fatty Acid anion "head-in"MetaboliteCHEBI:28868 (ChEBI)
Fatty Acid anion "head-out"MetaboliteCHEBI:28868 (ChEBI)
Fatty Acid anion "head-in" MetaboliteCHEBI:28868 (ChEBI)
Fatty Acid anion "head-out" MetaboliteCHEBI:28868 (ChEBI)
GDP MetaboliteCHEBI:17552 (ChEBI)
GTP MetaboliteCHEBI:15996 (ChEBI)
H+MetaboliteCHEBI:15378 (ChEBI)
H2OMetaboliteCHEBI:15377 (ChEBI)
HP subcomplexComplexR-HSA-163929 (Reactome)
Heme 1 cytochrome c1 cofactor R-ALL-164585 (Reactome)
Heme 2 cytochrome c1 cofactor R-ALL-164586 (Reactome)
Heme bL R-ALL-164657 (Reactome)
IP subcomplexComplexR-HSA-5689699 (Reactome)
Intermediate 1ComplexR-HSA-6788529 (Reactome)
Intermediate 2ComplexR-HSA-6799181 (Reactome)
Iron Sulphur Cluster R-ALL-113591 (Reactome)
Ketone body metabolismPathwayR-HSA-74182 (Reactome) Acetoacetate, beta-hydroxybutyrate, and acetone collectively are called ketone bodies. The first two are synthesized from acetyl-CoA, in the mitochondria of liver cells; acetone is formed by spontaneous decarboxylation of acetoacetate. Ketone body synthesis in liver is effectively irreversible because the enzyme that catalyzes the conversion of acetoacetate to acetoacetyl-CoA is not present in liver cells.

Ketone bodies, unlike fatty acids and triglycerides, are water-soluble. They are exported from the liver, and are taken up by other tissues, notably brain and skeletal and cardiac muscle. There, they are broken down to acetyl-CoA which is oxidized via the TCA cycle to yield energy. In a normal person, this pathway of ketone body synthesis and utilization is most active during extended periods of fasting. Under these conditions, mobilization and breakdown of stored fatty acids generates abundant acetyl-CoA acetyl-CoA in liver cells for synthesis of ketone bodies, and their utilization in other tissues minimizes the demand of these tissues for glucose (Sass 2011).

LCFAMetaboliteCHEBI:15904 (ChEBI)
LRPPRC ProteinP42704 (Uniprot-TrEMBL)
MCIA complexComplexR-HSA-5689052 (Reactome)
MT-ATP6 ProteinP00846 (Uniprot-TrEMBL)
MT-ATP8 ProteinP03928 (Uniprot-TrEMBL)
MT-CO1 ProteinP00395 (Uniprot-TrEMBL)
MT-CO2 ProteinP00403 (Uniprot-TrEMBL)
MT-CO3 ProteinP00414 (Uniprot-TrEMBL)
MT-CYB ProteinP00156 (Uniprot-TrEMBL)
MT-ND1 ProteinP03886 (Uniprot-TrEMBL)
MT-ND1ProteinP03886 (Uniprot-TrEMBL)
MT-ND2 ProteinP03891 (Uniprot-TrEMBL)
MT-ND2ProteinP03891 (Uniprot-TrEMBL)
MT-ND3 ProteinP03897 (Uniprot-TrEMBL)
MT-ND3ProteinP03897 (Uniprot-TrEMBL)
MT-ND4 ProteinP03905 (Uniprot-TrEMBL)
MT-ND4ProteinP03905 (Uniprot-TrEMBL)
MT-ND5 ProteinP03915 (Uniprot-TrEMBL)
MT-ND5ProteinP03915 (Uniprot-TrEMBL)
MT-ND6 ProteinP03923 (Uniprot-TrEMBL)
MT-ND6ProteinP03923 (Uniprot-TrEMBL)
Mitochondrial Fatty Acid Beta-OxidationPathwayR-HSA-77289 (Reactome) Beta-oxidation begins once fatty acids have been imported into the mitochondrial matrix by carnitine acyltransferases. The beta-oxidation spiral of fatty acids metabolism involves the repetitive removal of two carbon units from the fatty acyl chain. There are four steps to this process: oxidation, hydration, a second oxidation, and finally thiolysis. The last step releases the two-carbon acetyl-CoA and a ready primed acyl-CoA that takes another turn down the spiral. In total each turn of the beta-oxidation spiral produces one NADH, one FADH2, and one acetyl-CoA.

Further oxidation of acetyl-CoA via the tricarboxylic acid cycle generates additional FADH2 and NADH. All reduced cofactors are used by the mitochondrial electron transport chain to form ATP. The complete oxidation of a fatty acid molecule produces numerous ATP molecules. Palmitate, used as the model here, produces 129 ATPs.

Beta-oxidation pathways differ for saturated and unsaturated fatty acids. The beta-oxidation of saturated fatty acids requires four different enzymatic steps. Beta-oxidation produces and consumes intermediates with a trans configuration; unsaturated fatty acids that have bonds in the cis configuration require three separate enzymatic steps to prepare these molecules for the beta-oxidation pathway.

NAD+MetaboliteCHEBI:15846 (ChEBI)
NADHMetaboliteCHEBI:16908 (ChEBI)
NDUF subunitsComplexR-HSA-6788518 (Reactome)
NDUF:4Fe-4S subunitsComplexR-HSA-6788527 (Reactome)
NDUFA1 ProteinO15239 (Uniprot-TrEMBL)
NDUFA10 ProteinO95299 (Uniprot-TrEMBL)
NDUFA11 ProteinQ86Y39 (Uniprot-TrEMBL)
NDUFA12 ProteinQ9UI09 (Uniprot-TrEMBL)
NDUFA12ProteinQ9UI09 (Uniprot-TrEMBL)
NDUFA13 ProteinQ9P0J0 (Uniprot-TrEMBL)
NDUFA2 ProteinO43678 (Uniprot-TrEMBL)
NDUFA3 ProteinO95167 (Uniprot-TrEMBL)
NDUFA4 ProteinO00483 (Uniprot-TrEMBL)
NDUFA5 ProteinQ16718 (Uniprot-TrEMBL)
NDUFA6 ProteinP56556 (Uniprot-TrEMBL)
NDUFA7 ProteinO95182 (Uniprot-TrEMBL)
NDUFA8 ProteinP51970 (Uniprot-TrEMBL)
NDUFA9 ProteinQ16795 (Uniprot-TrEMBL)
NDUFA9:FADComplexR-HSA-164289 (Reactome)
NDUFAB1 ProteinO14561 (Uniprot-TrEMBL)
NDUFAF1 ProteinQ9Y375 (Uniprot-TrEMBL)
NDUFAF2 ProteinQ8N183 (Uniprot-TrEMBL)
NDUFAF2ProteinQ8N183 (Uniprot-TrEMBL)
NDUFAF3 ProteinQ9BU61 (Uniprot-TrEMBL)
NDUFAF3ProteinQ9BU61 (Uniprot-TrEMBL)
NDUFAF4 ProteinQ9P032 (Uniprot-TrEMBL)
NDUFAF4ProteinQ9P032 (Uniprot-TrEMBL)
NDUFAF5 ProteinQ5TEU4 (Uniprot-TrEMBL)
NDUFAF5ProteinQ5TEU4 (Uniprot-TrEMBL)
NDUFAF6 ProteinQ330K2 (Uniprot-TrEMBL)
NDUFAF6ProteinQ330K2 (Uniprot-TrEMBL)
NDUFAF7 ProteinQ7L592 (Uniprot-TrEMBL)
NDUFAF7:NDUFS2:2x4Fe-4SComplexR-HSA-164288 (Reactome)
NDUFAF7ProteinQ7L592 (Uniprot-TrEMBL)
NDUFB1 ProteinO75438 (Uniprot-TrEMBL)
NDUFB10 ProteinO96000 (Uniprot-TrEMBL)
NDUFB11 ProteinQ9NX14 (Uniprot-TrEMBL)
NDUFB2 ProteinO95178 (Uniprot-TrEMBL)
NDUFB3 ProteinO43676 (Uniprot-TrEMBL)
NDUFB4 ProteinO95168 (Uniprot-TrEMBL)
NDUFB5 ProteinO43674 (Uniprot-TrEMBL)
NDUFB6 ProteinO95139 (Uniprot-TrEMBL)
NDUFB6ProteinO95139 (Uniprot-TrEMBL)
NDUFB7 ProteinP17568 (Uniprot-TrEMBL)
NDUFB8 ProteinO95169 (Uniprot-TrEMBL)
NDUFB9 ProteinQ9Y6M9 (Uniprot-TrEMBL)
NDUFC1 ProteinO43677 (Uniprot-TrEMBL)
NDUFC2 ProteinO95298 (Uniprot-TrEMBL)
NDUFS1 ProteinP28331 (Uniprot-TrEMBL)
NDUFS1:2x4Fe-4SComplexR-HSA-164297 (Reactome)
NDUFS2 ProteinO75306 (Uniprot-TrEMBL)
NDUFS3 ProteinO75489 (Uniprot-TrEMBL)
NDUFS3ProteinO75489 (Uniprot-TrEMBL)
NDUFS4 ProteinO43181 (Uniprot-TrEMBL)
NDUFS4ProteinO43181 (Uniprot-TrEMBL)
NDUFS5 ProteinO43920 (Uniprot-TrEMBL)
NDUFS5ProteinO43920 (Uniprot-TrEMBL)
NDUFS6 ProteinO75380 (Uniprot-TrEMBL)
NDUFS6ProteinO75380 (Uniprot-TrEMBL)
NDUFS7 ProteinO75251 (Uniprot-TrEMBL)
NDUFS7:4Fe-4SComplexR-HSA-164293 (Reactome)
NDUFS8 ProteinO00217 (Uniprot-TrEMBL)
NDUFS8:2x4Fe-4SComplexR-HSA-164295 (Reactome)
NDUFV1 ProteinP49821 (Uniprot-TrEMBL)
NDUFV1:4Fe-4S:FMNComplexR-HSA-6788516 (Reactome)
NDUFV1ProteinP49821 (Uniprot-TrEMBL)
NDUFV2 ProteinP19404 (Uniprot-TrEMBL)
NDUFV2:4Fe-4SComplexR-HSA-6788524 (Reactome)
NDUFV2ProteinP19404 (Uniprot-TrEMBL)
NDUFV3 ProteinP56181 (Uniprot-TrEMBL)
NDUFV3ProteinP56181 (Uniprot-TrEMBL)
NUBPL ProteinQ8TB37 (Uniprot-TrEMBL)
NUBPL:4Fe-4SComplexR-HSA-5690007 (Reactome)
NUBPLProteinQ8TB37 (Uniprot-TrEMBL)
O2MetaboliteCHEBI:15379 (ChEBI)
Pi MetaboliteCHEBI:18367 (ChEBI)
PiMetaboliteCHEBI:18367 (ChEBI)
Purine nucleotideComplexR-ALL-170037 (Reactome)
QH2MetaboliteCHEBI:17976 (ChEBI)
SCO1 ProteinO75880 (Uniprot-TrEMBL)
SCO2 ProteinO43819 (Uniprot-TrEMBL)
SDH complex (ox.)ComplexR-HSA-70990 (Reactome)
SDHA ProteinP31040 (Uniprot-TrEMBL)
SDHB ProteinP21912 (Uniprot-TrEMBL)
SDHC ProteinQ99643 (Uniprot-TrEMBL)
SDHD ProteinO14521 (Uniprot-TrEMBL)
SLC25A14 ProteinO95258 (Uniprot-TrEMBL)
SLC25A27 ProteinO95847 (Uniprot-TrEMBL)
SURF1 ProteinQ15526 (Uniprot-TrEMBL)
Succinate

dehydrogenase

complex (reduced)
ComplexR-HSA-165631 (Reactome)
TACO1 ProteinQ9BSH4 (Uniprot-TrEMBL)
TIMMDC1 ProteinQ9NPL8 (Uniprot-TrEMBL)
TIMMDC1ProteinQ9NPL8 (Uniprot-TrEMBL)
TMEM126B ProteinQ8IUX1 (Uniprot-TrEMBL)
TRAP1ProteinQ12931 (Uniprot-TrEMBL)
UCP dimerComplexR-HSA-166389 (Reactome)
UCP1 ProteinP25874 (Uniprot-TrEMBL)
UCP2 ProteinP55851 (Uniprot-TrEMBL)
UCP3 ProteinP55916 (Uniprot-TrEMBL)
UQCR10 ProteinQ9UDW1 (Uniprot-TrEMBL)
UQCR11 ProteinO14957 (Uniprot-TrEMBL)
UQCRB ProteinP14927 (Uniprot-TrEMBL)
UQCRC1 ProteinP31930 (Uniprot-TrEMBL)
UQCRC2 ProteinP22695 (Uniprot-TrEMBL)
UQCRFS1(79-274) ProteinP47985 (Uniprot-TrEMBL)
UQCRH ProteinP07919 (Uniprot-TrEMBL)
UQCRQ ProteinO14949 (Uniprot-TrEMBL)
Ubiquinol-cytochrome c reductaseComplexR-HSA-164317 (Reactome)
ferriheme MetaboliteCHEBI:38574 (ChEBI)
ferroheme MetaboliteCHEBI:38573 (ChEBI)

Annotated Interactions

View all...
SourceTargetTypeDatabase referenceComment
315kDa subcomplexArrowR-HSA-6799191 (Reactome)
315kDa subcomplexR-HSA-6799202 (Reactome)
370 kDa subcomplexArrowR-HSA-6799199 (Reactome)
370 kDa subcomplexR-HSA-6799202 (Reactome)
4Fe-4SR-HSA-5690023 (Reactome)
550kDa complexArrowR-HSA-6799202 (Reactome)
550kDa complexR-HSA-6799197 (Reactome)
815kDa complexArrowR-HSA-6799197 (Reactome)
815kDa complexR-HSA-6799179 (Reactome)
980kDa complexArrowR-HSA-6799179 (Reactome)
980kDa complexR-HSA-6799196 (Reactome)
ADPR-HSA-164840 (Reactome)
ATPArrowR-HSA-164834 (Reactome)
ATPase:ADP:PiArrowR-HSA-164840 (Reactome)
ATPase:ADP:PiR-HSA-164832 (Reactome)
ATPase:ADP:Pimim-catalysisR-HSA-164832 (Reactome)
ATPase:ATPArrowR-HSA-164832 (Reactome)
ATPase:ATPR-HSA-164834 (Reactome)
ATPase:ATPmim-catalysisR-HSA-164834 (Reactome)
COQ10A,BArrowR-HSA-163217 (Reactome)
COX ancilliary proteinsArrowR-HSA-163214 (Reactome)
COX11,14,16,18,20ArrowR-HSA-163214 (Reactome)
COX19ArrowR-HSA-163214 (Reactome)
CoQArrowR-HSA-164651 (Reactome)
CoQR-HSA-163213 (Reactome)
CoQR-HSA-163217 (Reactome)
CoQR-HSA-164651 (Reactome)
CoQR-HSA-169270 (Reactome)
Complex IArrowR-HSA-6799196 (Reactome)
Complex Imim-catalysisR-HSA-163217 (Reactome)
Cytochrome c (oxidised)ArrowR-HSA-163214 (Reactome)
Cytochrome c (oxidised)R-HSA-164651 (Reactome)
Cytochrome c (reduced)ArrowR-HSA-164651 (Reactome)
Cytochrome c (reduced)R-HSA-163214 (Reactome)
Cytochrome c oxidasemim-catalysisR-HSA-163214 (Reactome)
ETF:FADArrowR-HSA-169270 (Reactome)
ETF:FADH2ArrowR-HSA-169260 (Reactome)
ETF:FADH2R-HSA-169270 (Reactome)
ETF:FADR-HSA-169260 (Reactome)
ETF:FADmim-catalysisR-HSA-169260 (Reactome)
ETFDHmim-catalysisR-HSA-169270 (Reactome)
F1Fo ATP synthaseArrowR-HSA-164834 (Reactome)
F1Fo ATP synthaseR-HSA-164840 (Reactome)
FA anion:UCP dimer "head-in" complexArrowR-HSA-166220 (Reactome)
FA anion:UCP dimer "head-in" complexR-HSA-166214 (Reactome)
FA anion:UCP dimer "head-in" complexmim-catalysisR-HSA-166214 (Reactome)
FA anion:UCP dimer "head-out" complexArrowR-HSA-166214 (Reactome)
FA anion:UCP dimer "head-out" complexR-HSA-166387 (Reactome)
FADArrowR-HSA-169260 (Reactome)
FADH2R-HSA-169260 (Reactome)
FMNR-HSA-6788556 (Reactome)
FP subcomplexArrowR-HSA-6800870 (Reactome)
FP subcomplexR-HSA-6799179 (Reactome)
Fatty Acid "head-out"ArrowR-HSA-166219 (Reactome)
Fatty Acid "head-out"R-HSA-166215 (Reactome)
Fatty Acid "head-in"ArrowR-HSA-166215 (Reactome)
Fatty Acid "head-in"R-HSA-166223 (Reactome)
Fatty Acid anion "head-in"ArrowR-HSA-166223 (Reactome)
Fatty Acid anion "head-in"R-HSA-166220 (Reactome)
Fatty Acid anion "head-out"ArrowR-HSA-166387 (Reactome)
Fatty Acid anion "head-out"R-HSA-166219 (Reactome)
H+ArrowR-HSA-163214 (Reactome)
H+ArrowR-HSA-163217 (Reactome)
H+ArrowR-HSA-164651 (Reactome)
H+ArrowR-HSA-164834 (Reactome)
H+ArrowR-HSA-166223 (Reactome)
H+ArrowR-HSA-170026 (Reactome)
H+R-HSA-163214 (Reactome)
H+R-HSA-163217 (Reactome)
H+R-HSA-164651 (Reactome)
H+R-HSA-164834 (Reactome)
H+R-HSA-166219 (Reactome)
H+R-HSA-170026 (Reactome)
H2OArrowR-HSA-163214 (Reactome)
H2OArrowR-HSA-164832 (Reactome)
HP subcomplexR-HSA-6799178 (Reactome)
IP subcomplexArrowR-HSA-6800868 (Reactome)
IP subcomplexR-HSA-6799203 (Reactome)
Intermediate 1ArrowR-HSA-6799203 (Reactome)
Intermediate 1R-HSA-6799178 (Reactome)
Intermediate 2ArrowR-HSA-6799178 (Reactome)
Intermediate 2R-HSA-6799191 (Reactome)
LCFAArrowR-HSA-170026 (Reactome)
MCIA complexArrowR-HSA-6799196 (Reactome)
MCIA complexR-HSA-6799199 (Reactome)
MT-ND1R-HSA-6799191 (Reactome)
MT-ND2R-HSA-6799199 (Reactome)
MT-ND3R-HSA-6799199 (Reactome)
MT-ND4R-HSA-6799197 (Reactome)
MT-ND5R-HSA-6799197 (Reactome)
MT-ND6R-HSA-6799199 (Reactome)
NAD+ArrowR-HSA-163217 (Reactome)
NADHR-HSA-163217 (Reactome)
NDUF subunitsR-HSA-6788523 (Reactome)
NDUF:4Fe-4S subunitsArrowR-HSA-6788523 (Reactome)
NDUFA12R-HSA-6800870 (Reactome)
NDUFA9:FADR-HSA-6800868 (Reactome)
NDUFAF2ArrowR-HSA-6799196 (Reactome)
NDUFAF2R-HSA-6800870 (Reactome)
NDUFAF3ArrowR-HSA-6799196 (Reactome)
NDUFAF3R-HSA-6799203 (Reactome)
NDUFAF4ArrowR-HSA-6799196 (Reactome)
NDUFAF4R-HSA-6799203 (Reactome)
NDUFAF5ArrowR-HSA-6799196 (Reactome)
NDUFAF5R-HSA-6799191 (Reactome)
NDUFAF6ArrowR-HSA-6799196 (Reactome)
NDUFAF6R-HSA-6799191 (Reactome)
NDUFAF7:NDUFS2:2x4Fe-4SR-HSA-6800868 (Reactome)
NDUFAF7ArrowR-HSA-6799196 (Reactome)
NDUFB6R-HSA-6799199 (Reactome)
NDUFS1:2x4Fe-4SR-HSA-6800870 (Reactome)
NDUFS3R-HSA-6800868 (Reactome)
NDUFS4R-HSA-6800870 (Reactome)
NDUFS5R-HSA-6799179 (Reactome)
NDUFS6R-HSA-6800870 (Reactome)
NDUFS7:4Fe-4SR-HSA-6800868 (Reactome)
NDUFS8:2x4Fe-4SR-HSA-6800868 (Reactome)
NDUFV1:4Fe-4S:FMNArrowR-HSA-6788556 (Reactome)
NDUFV1:4Fe-4S:FMNR-HSA-6800870 (Reactome)
NDUFV1R-HSA-6788556 (Reactome)
NDUFV2:4Fe-4SArrowR-HSA-6788556 (Reactome)
NDUFV2:4Fe-4SR-HSA-6800870 (Reactome)
NDUFV2R-HSA-6788556 (Reactome)
NDUFV3R-HSA-6800870 (Reactome)
NUBPL:4Fe-4SArrowR-HSA-5690023 (Reactome)
NUBPL:4Fe-4SR-HSA-6788523 (Reactome)
NUBPL:4Fe-4SR-HSA-6788556 (Reactome)
NUBPLArrowR-HSA-6788523 (Reactome)
NUBPLArrowR-HSA-6788556 (Reactome)
NUBPLR-HSA-5690023 (Reactome)
O2R-HSA-163214 (Reactome)
PiR-HSA-164840 (Reactome)
Purine nucleotideTBarR-HSA-170026 (Reactome)
QH2ArrowR-HSA-163213 (Reactome)
QH2ArrowR-HSA-163217 (Reactome)
QH2ArrowR-HSA-164651 (Reactome)
QH2ArrowR-HSA-169270 (Reactome)
QH2R-HSA-164651 (Reactome)
R-HSA-163213 (Reactome) This event is deduced on the basis of bovine experimental data.
Complex II (succinate dehydrogenase) transfers electrons from the TCA cycle to ubiquinone. The 6th step in the TCA cycle is where succinate is dehydrogenated to fumarate with subsequent reduction of FAD to FADH2. FADH2 provides the electrons for the transport chain. Succinate dehydrogenase belongs to subclass 1 of the SQR family (succinate:quinone reductase) (classified by Hagerhall, C and Hederstedt, L [1996]).
It consists of 4 subunits (referred to as A, B, C and D), all nuclear-encoded and is located on the matrix side of the inner mitochondrial membrane. Subunits A and B are hydrophilic whereas subunits C and D are integral proteins of the inner membrane. SQRs usually contain 3 Fe-S clusters bound by the B subunit. Succinate dehydrogenase contains one [2Fe-2S] cluster, one [4Fe-4S] cluster and one [3Fe-4S] cluster. Additionally, the A subunit has a covalently-bound FAD group. Reduced complex II has this FAD converted to FADH2. The electrons from complex II are transferred to ubiquinone (also called Q, Coenzyme Q or CoQ), a small mobile carrier of electrons located within the inner membrane. Ubiquinone is reduced to ubiquinol during this process.

The mitochondrial heat shock protein 75 kDa (TRAP1) inhibits Complex II of the respiratory chain which elicits respiratory downregulation, leading to a pseudohypoxic state. This state is caused by succinate-dependent HIF1-alpha stabilisation which, in turn, can promote tumorigenesis (Sciacovelli et al. 2013, Yoshida et al. 2013, Guzzo et al. 2014).
R-HSA-163214 (Reactome) Complex IV (COX, cytochrome c oxidase) contains the hemeprotein cytochrome a and a3. It also contains copper atoms which undergo a transition from Cu+ to Cu2+ during the transfer of electrons through the complex to molecular oxygen. A bimetallic centre containing a copper atom and a heme-linked iron protein binds oxygen after 4 electrons have been picked up. Water, the final product of oxygen reduction, is then released. Oxygen is the final electron acceptor in the respiratory chain. The overall reaction can be summed as

4Cyt c (red.) + 12H+ (in) + O2 = 4Cyt c (ox.) + 2H2O + 8H+ (out)

Four protons are taken up from the matrix side of the membrane to form the water (scalar protons). Wikstrom (1977) suggests 4 protons are additionally transferred out from the matrix to the intermembrane space.

COX ancillary proteins mediate membrane insertion, catalytic core processing, copper transport and insertion into core subunits and heme A biosynthesis (Stilburek et al. 2006, Fontanesi et al. 2006, Soto et al. 2012). To date, all Mendelian disorders presenting COX deficiency have been assigned to mutations in ancillary factors, with the exception of an infantile encephalomyopathy caused by a defective COX6B1 and an exocrine pancreatic insufficiency caused by a defective COX4I2 gene (Soto et al. 2012). Balsa et al have shown that NDUFA4, formerly considered to be a constituent of NADH dehydrogenase (Complex I), is instead a component of the cytochrome c oxidase (CIV) (Balsa et al. 2012). Patients with NDUFA4 mutations display COX deficiencies (Pitceathly et al. 2013).
R-HSA-163217 (Reactome) Complex I (NADH:ubiquinone oxidoreductase or NADH dehydrogenase) utilizes NADH formed from glycolysis and the TCA cycle to pump protons out of the mitochondrial matrix. It is the largest enzyme complex in the electron transport chain, containing 45 subunits. Seven subunits (ND1-6, ND4L) are encoded by mitochondrial DNA (Loeffen et al [1998]), the remainder are encoded in the nucleus. The enzyme has a FMN prosthetic group and 8 Iron-Sulfur (Fe-S) clusters. The electrons from NADH oxidation pass through the flavin (FMN) and Fe-S clusters to ubiquinone (CoQ). This electron transfer is coupled with the translocation of protons from the mitochondrial matrix to the intermembrane space. For each electron transferred, 2 protons can be pumped out of the matrix. As there are 2 electrons transferred, 4 protons can be pumped out.
Complex I is made up of 3 sub-complexes - Iron-Sulfur protein fraction (IP), Flavoprotein fraction (FP) and the Hydrophobic protein fraction (HP), probably arranged in an L-shaped structure with the IP and FP fractions protruding into the mitochondrial matrix and the HP arm lying within the inner mitochondrial membrane. The overall reaction can be summed as below:
NADH + Ubiquinone + 5H+ (mito. matrix) = NAD+ + Ubiquinol + 4H+ (intermemb. space)
The electrons from complex I are transferred to ubiquinone (Coenzyme Q, CoQ), a small mobile carrier of electrons located within the inner membrane. Ubiquinone is reduced to ubiquinol (QH2) during this process.

Mitochondrial coenzyme Q-binding protein COQ10 homologs A and B (COQ10A and B) are thought to be required for correct coenzyme CoQ in the respiratory chain. Their function in humans is unknown but the yeast model suggests functions in facilitating de novo CoQ biosynthesis and in delivering it to one or more complexes of the respiratory electron transport chain (Barros et al. 2005, Allan et al. 2013).
R-HSA-164651 (Reactome) The protonmotive Q cycle is the mechanism by which complex III transfers electrons from ubiquinol to cytochrome c, linking this process to translocation of protons across the membrane. This cycle is complicated by the fact that both ubiquinol is oxidised and ubiquinone is reduced during this process. Through a complex series of electron transfers, Complex III consumes two molecules of ubiquinol (QH2) and two molecules of oxidized cytochrome c, generates one molecule of ubiquinone (Q) and two molecules of reduced cytochrome c, regenerates one molecule of ubiquinol (QH2), and mediates the translocation of two protons from the mitochondrial matrix to the mitochondrial intermembrane space. The overall reaction can be summed up as

2QH2 + 2cyt c (ox.) + Q + 2H+ (matrix) = 2Q + 2cyt c (red.) + QH2 + 4H+ (intermemb. space)
R-HSA-164832 (Reactome) In the tight configuration, the beta subunit catalyzes the reaction of ADP + Pi to ATP + water. ATP is still tightly bound to the subunit at this stage.
R-HSA-164834 (Reactome) In the last step, the beta subunit is converted to the open form and ATP is released. Passage of protons through the Fo part causes a ring of approximately 10 subunits to rotate. This rotation in turn drives the rotation of the gamma subunits, which forms part of one of the stalks. The gamma subunit moves between the three beta subunits which are held in place by the second stalk which can be regarded as a stator. The polypeptide called OSCP connects the stator stalk to the assembly of alpha and beta subunits. It is this step that is coupled to proton translocation as energy is required to break the strong bond between ATP and the protein.
R-HSA-164840 (Reactome) The beta subunit has 3 conformations; tight, open and loose. ADP and Pi bind to the subunit in the loose form. On binding, this subunit is converted to the tight configuration.
R-HSA-166214 (Reactome) The FA anion which was facing the matrix side of the inner mitochondrial membrane now flip-flops over to the intermembrane space-side of the membrane.
R-HSA-166215 (Reactome) At the beginning of this reaction, 1 molecule of 'Fatty Acid "head-out"' is present. At the end of this reaction, 1 molecule of 'Fatty Acid "head-in"' is present.

This reaction takes place in the 'mitochondrial inner membrane'.

R-HSA-166219 (Reactome) At the beginning of this reaction, 1 molecule of 'H+', and 1 molecule of 'Fatty Acid anion "head-out"' are present. At the end of this reaction, 1 molecule of 'Fatty Acid "head-out"' is present.

This reaction takes place in the 'mitochondrial inner membrane'.

R-HSA-166220 (Reactome) A FA anion diffuses laterally within the membrane towards UCP. The membrane potential drives the FA anion to an energy well halfway up on UCP. The electric field created by the redox-linked proton ejection drives the head group to the energy well.
R-HSA-166223 (Reactome) At the beginning of this reaction, 1 molecule of 'Fatty Acid "head-in"' is present. At the end of this reaction, 1 molecule of 'H+', and 1 molecule of 'Fatty Acid anion "head-in"' are present.

This reaction takes place in the 'mitochondrial inner membrane'.

R-HSA-166387 (Reactome) At the beginning of this reaction, 1 molecule of 'FA anion:UCP dimer "head-out" complex' is present. At the end of this reaction, 1 molecule of 'UCP dimer', and 1 molecule of 'Fatty Acid anion "head-out"' are present.

This reaction takes place in the 'mitochondrial inner membrane' (Garlid et al. 1996).

R-HSA-169260 (Reactome) Electron transfer flavoprotein (ETF) is a 63kDa heterodimer composed of alpha and beta subunits and binds one FAD and one AMP per dimer. ETF resides on the matrix face of the mitochondrial inner membrane. Reducing equivalents from the beta-oxidation of fatty acyl CoAs are transferred to ETF, reducing the ETF-bound FAD to FADH2 (Wood 1999).
R-HSA-169270 (Reactome) ETF-ubiquinone oxidoreductase (ETFDH), catalyses the re-oxidation of reduced ETF, with ubiquinone (CoQ) as the electron acceptor being reduced to ubiquinol (QH2) (Estornell et al. 1992, MacLennan et al. 1997).
R-HSA-170026 (Reactome) In this reaction, 1 molecule of 'H+' is translocated from mitochondrial intermembrane space to mitochondrial matrix.

This reaction takes place in the 'mitochondrial inner membrane' and is mediated by the 'hydrogen ion transporter activity' of 'UCP dimer' (Echtay et al. 2002a, Echtay et al. 2002b).
R-HSA-5690023 (Reactome) The iron-sulfur protein NUBPL is thought to bind the cofactor [4Fe-4S] cluster and deliver it to complex I (NADH dehydrogenase) subunits during its biogenesis. The exact mechanism of transfer is unknown but defects in NUBPL are shown to cause mitochondrial complex I deficiency (MT-C1D) with a distinct MRI pattern (Sheftel et al. 2009, Kevelam et al. 2013).
R-HSA-6788523 (Reactome) In total, eight iron-sulfur (4Fe-4S) clusters are incorporated into six subunits (mitochondrial matrix-located NDUFS1, S2, S7, S8 and mitochondrial membrane-located V1 and V2) (Andrews et al. 2013). Incorporation into NDUFV1 and V2 (located on the mitochondrial membrane) is shown in a separate reaction. The mechanism of transfer in all cases is unknown.
R-HSA-6788556 (Reactome) In total, eight iron-sulfur (4Fe-4S) clusters are incorporated into six subunits (mitochondrial matrix-located NDUFS1, S2, S7, S8 and mitochondrial membrane-located V1 and V2) (Andrews et al. 2013). Incorporation into NDUFS1, S2, S7 and S8 is shown in a separate reaction. The mechanism of transfer is unknown. NDUFV1 also binds FMN (Schuelke et al. 1998).
R-HSA-6799178 (Reactome) The hydrophobic protein fraction (HP) is assembled with NDUFA3, 8, 9 and 13 amongst many others and anchored to the inner mitochondrial membrane by Intermediate 1 assembly factors NDUFAF3 (C3orf60), NDUFAF4 (C6orf66) and TIMMDC1 (C3orf1) to form Intermediate 2 (Mckenzie & Ryan 2010, Andrews et al. 2013).
R-HSA-6799179 (Reactome) Subunits NDUFA12, NDUFS1, 4, 6, NDUFV1, 2 and 3 with the assembly factor NDUFAF2 comprises the peripheral arm, called the flavoprotein (FP) subcomplex. In addition, remaining subunits such as NDUFS5 join here (Mimaki et al. 2012).
R-HSA-6799191 (Reactome) A complex I intermediate of 315kDa (reestimated from the original 400kDa) is formed centred around the core subunits NADH dehydrogenase [ubiquinone] iron-sulfur proteins 2 and 3 (NDUFS2 and NDUFS3) with other complex I subunits and assembly factor subunits (forming IP and HP subcomplexes). The IP subcomplex is anchored to the inner mitochondrial membrane by NADH-ubiquinone oxidoreductase chain 1 (MT-ND1) (together with NDUFAF5 and/or 6) (Mckenzie & Ryan 2010, Andrews et al. 2013).
R-HSA-6799196 (Reactome) In the last step, the MCIA complex and it is assumed all of the assembly factors (NDUFAF2-7, TIMMDC1) dissociate from the 980kDa complex to leave mature Complex I (Mckenzie & Ryan 2010, Andrews et al. 2013).
R-HSA-6799197 (Reactome) Distal components of the membrane arm MT-ND4 and 5 associate with the 550kDa complex to form the 815kDa complex (Mckenzie & Ryan 2010, Andrews et al. 2013).
R-HSA-6799199 (Reactome) Membrane arm subunits MT-ND2, 3 and 6 and NDUFB6 associate with the assembly factors TMEM126B, NDUFAF1, ECSIT and ACAD9 (which form the MCIA complex) forming a 370kDa subcomplex (Mckenzie & Ryan 2010, Andrews et al. 2013).
R-HSA-6799202 (Reactome) The 315kDa and 370kDa subcomplexes associate to form a 550kDa complex (Mckenzie & Ryan 2010, Andrews et al. 2013).
R-HSA-6799203 (Reactome) Complex I assembly begins with the formation of a 315kDa subcomplex, centred around the core subunits NADH dehydrogenase [ubiquinone] iron-sulfur proteins 2 and 3 (NDUFS2 and NDUFS3) (Mckenzie & Ryan 2010, Mimaki et al. 2012, Andrews et al. 2013). NDUFS2 is thought to be bound to NDUFAF7 (Carilla-Latorre et al. 2010). Defects in NDUFS2 can cause mitochondrial complex I deficiency (MT-C1D; OMIM:252010), causing a wide range of clinical disorders, ranging from lethal neonatal disease to adult-onset neurodegenerative disorders (Loeffen et al. 2001). As an initial part of the 315kDa subcomplex, the subunits NDUFS7, S8 and A9, together with NDUFS2 and S3, form an evolutionarily conserved hydrogenase module as part of the Iron-Sulfur protein fraction (IP) subcomplex (termed Intermediate 1 here) (Mckenzie & Ryan 2010, Andrews et al. 2013).
R-HSA-6800868 (Reactome) The subunits NDUFS7, S8 and A9, together with NDUFS2 and S3, form an evolutionarily conserved hydrogenase module as part of the Iron-Sulfur protein fraction (IP) subcomplex (Mckenzie & Ryan 2010, Andrews et al. 2013).
R-HSA-6800870 (Reactome) Subunits NDUFA12, NDUFS1, 4, 6, NDUFV1, 2 and 3 with the assembly factor NDUFAF2 comprises the peripheral arm, called the flavoprotein (FP) subcomplex (Mimaki et al. 2012).
SDH complex (ox.)ArrowR-HSA-163213 (Reactome)
Succinate

dehydrogenase

complex (reduced)
R-HSA-163213 (Reactome)
Succinate

dehydrogenase

complex (reduced)
mim-catalysisR-HSA-163213 (Reactome)
TIMMDC1ArrowR-HSA-6799196 (Reactome)
TIMMDC1R-HSA-6799203 (Reactome)
TRAP1TBarR-HSA-163213 (Reactome)
UCP dimerArrowR-HSA-166387 (Reactome)
UCP dimerR-HSA-166220 (Reactome)
UCP dimermim-catalysisR-HSA-170026 (Reactome)
Ubiquinol-cytochrome c reductasemim-catalysisR-HSA-164651 (Reactome)
Personal tools