Deadenylation-dependent mRNA decay (Homo sapiens)

From WikiPathways

Revision as of 11:52, 16 July 2014 by ReactomeTeam (Talk | contribs)
Jump to: navigation, search
15, 18, 20, 28, 33...1, 15, 18, 20, 21, 28...15, 18, 20, 22, 24...7, 15, 18, 20, 26...2, 15, 18, 20, 28...15, 18, 20, 23, 28...11, 15, 18, 20, 22...6, 13, 15, 16, 18...3, 5, 15, 18-20, 25...DeadenylatedmRNA:Lsm1-7 Complex[cytosol]Decapped mRNA:LSM1-7Complex [cytosol]Lsm1-7 Complex[cytosol]DCP1-DCP2 DecappingComplex [cytosol]CNOT7 or CNOT8[cytosol]eIF4A [cytosol]Translatable mRNAComplex [cytosol]Exosome Complex[cytosol]PARN homodimer[cytosol]Exosome Ring Hexamer[cytosol]PartiallyDeadenylated mRNAComplex [cytosol]eIF4A [cytosol]cytosolLsm1-7 Complex[cytosol]CCR4-NOT Complex[cytosol]PAN2-PAN3 Complex[cytosol]Lsm1-7 Complex[cytosol]CNOT6 or CNOT6L[cytosol]PAN2-PAN3 ComplexDCP1B(1-618)[cytosol]PATL1 [cytosol]CNOT3 [cytosol]CNOT8 [cytosol]EIF4A1(1-406)[cytosol]DIS3 [cytosol]CNOT11 [cytosol]EIF4A3 [cytosol]LSM7 [cytosol]EIF4A3 [cytosol]CNOT4 [cytosol]CMPEXOSC8 [cytosol]eIF4AUMPLsm1-7 ComplexLSM1 [cytosol]AMPDDX6 [cytosol]EXOSC5 [cytosol]EXOSC7 [cytosol]PAN3(1-741)[cytosol]PABPC1 [cytosol]EXOSC6 [cytosol]EDC4 [cytosol]GMPLSM7 [cytosol]PABPC1 [cytosol]AMPUMPEIF4A2 [cytosol]7-MeGDPPARN [cytosol]PABPC1EIF4B(2-118)[cytosol]PARN homodimerEDC3 [cytosol]7-MeGMPPAIP1PAN2 [cytosol]DCP1-DCP2 DecappingComplexEXOSC9 [cytosol]EXOSC1 [cytosol]H2OCNOT2 [cytosol]Translatable mRNAComplexEIF4E [cytosol]CNOT6 [cytosol]Decapped mRNA:LSM1-7ComplexEIF4B(2-118)[cytosol]PATL1 [cytosol]PAIP1 [cytosol]EIF4A1(1-406)[cytosol]EXOSC4 [cytosol]AMPLSM1 [cytosol]CNOT1 [cytosol]H2OCMPEXOSC3 [cytosol]H2ODCP1A [cytosol]EXOSC2 [cytosol]GMPLSM2 [cytosol]CCR4-NOT ComplexEIF4G1LSM5(2-91) [cytosol]EIF4E [cytosol]TNKS1BP1 [cytosol]LSM4 [cytosol]XRN1LSM2 [cytosol]DeadenylatedmRNA:Lsm1-7 ComplexRQCD1 [cytosol]EIF4A2 [cytosol]LSM4 [cytosol]CNOT6L [cytosol]PAIP1 [cytosol]cappedoligoribonucleotideLSM7 [cytosol]LSM5(2-91) [cytosol]LSM6 [cytosol]LSM4 [cytosol]LSM3(2-102)[cytosol]Exosome ComplexH2OLSM3(2-102)[cytosol]EIF4B(2-118)DCP2 [cytosol]CNOT7 [cytosol]LSM2 [cytosol]CNOT10 [cytosol]DCPS(1-337)LSM1 [cytosol]EIF4ELSM5(2-91) [cytosol]LSM6 [cytosol]PATL1 [cytosol]H2OPartiallyDeadenylated mRNAComplexoligoribonucleotidewith a5'-diphosphateEIF4G1 [cytosol]H2Omature mRNA(eukaryotic, cappedand deadenylated)EIF4G1 [cytosol]LSM3(2-102)[cytosol]LSM6 [cytosol]941, 17, 26, 36488, 14, 3912, 4610, 38


Description

After undergoing rounds of translation, mRNA is normally destroyed by the deadenylation-dependent pathway. Though the trigger is unclear, deadenylation likely proceeds in two steps: one catalyzed by the PAN2-PAN3 complex that shortens the poly(A) tail from about 200 adenosine residues to about 80 residues and one catalyzed by the CCR4-NOT complex or by the PARN enzyme that shortens the tail to about 10-15 residues.
After deadenylation the mRNA is then hydrolyzed by either the 5' to 3' pathway or the 3' to 5' pathway. It is unknown what determinants target a mRNA to one pathway or the other.
The 5' to 3' pathway is initiated by binding of the Lsm1-7 complex to the 3' oligoadenylate tail followed by decapping by the DCP1-DCP2 complex. The 5' to 3' exoribonuclease XRN1 then hydrolyzes the remaining RNA.
The 3' to 5' pathway is initiated by the exosome complex at the 3' end of the mRNA. The exosome processively hydrolyzes the mRNA from 3' to 5', leaving only a capped oligoribonucleotide. The cap is then removed by the scavenging decapping enzyme DCPS.Original Pathway at Reactome: http://www.reactome.org/PathwayBrowser/#DB=gk_current&FOCUS_SPECIES_ID=48887&FOCUS_PATHWAY_ID=429914

Try the New WikiPathways

View approved pathways at the new wikipathways.org.

Quality Tags

Ontology Terms

 

Bibliography

View all...
  1. Wu M, Reuter M, Lilie H, Liu Y, Wahle E, Song H.; ''Structural insight into poly(A) binding and catalytic mechanism of human PARN.''; PubMed Europe PMC Scholia
  2. Bail S, Kiledjian M.; ''More than 1 + 2 in mRNA decapping.''; PubMed Europe PMC Scholia
  3. Moore MJ.; ''From birth to death: the complex lives of eukaryotic mRNAs.''; PubMed Europe PMC Scholia
  4. Kowalinski E, Kögel A, Ebert J, Reichelt P, Stegmann E, Habermann B, Conti E.; ''Structure of a Cytoplasmic 11-Subunit RNA Exosome Complex.''; PubMed Europe PMC Scholia
  5. Wilusz CJ, Wormington M, Peltz SW.; ''The cap-to-tail guide to mRNA turnover.''; PubMed Europe PMC Scholia
  6. Siddiqui N, Mangus DA, Chang TC, Palermino JM, Shyu AB, Gehring K.; ''Poly(A) nuclease interacts with the C-terminal domain of polyadenylate-binding protein domain from poly(A)-binding protein.''; PubMed Europe PMC Scholia
  7. Zheng D, Ezzeddine N, Chen CY, Zhu W, He X, Shyu AB.; ''Deadenylation is prerequisite for P-body formation and mRNA decay in mammalian cells.''; PubMed Europe PMC Scholia
  8. Gallie DR.; ''A tale of two termini: a functional interaction between the termini of an mRNA is a prerequisite for efficient translation initiation.''; PubMed Europe PMC Scholia
  9. Ingelfinger D, Arndt-Jovin DJ, Lührmann R, Achsel T.; ''The human LSm1-7 proteins colocalize with the mRNA-degrading enzymes Dcp1/2 and Xrnl in distinct cytoplasmic foci.''; PubMed Europe PMC Scholia
  10. Yamashita A, Chang TC, Yamashita Y, Zhu W, Zhong Z, Chen CY, Shyu AB.; ''Concerted action of poly(A) nucleases and decapping enzyme in mammalian mRNA turnover.''; PubMed Europe PMC Scholia
  11. Fritz DT, Bergman N, Kilpatrick WJ, Wilusz CJ, Wilusz J.; ''Messenger RNA decay in mammalian cells: the exonuclease perspective.''; PubMed Europe PMC Scholia
  12. Fenger-Grøn M, Fillman C, Norrild B, Lykke-Andersen J.; ''Multiple processing body factors and the ARE binding protein TTP activate mRNA decapping.''; PubMed Europe PMC Scholia
  13. Garneau NL, Wilusz J, Wilusz CJ.; ''The highways and byways of mRNA decay.''; PubMed Europe PMC Scholia
  14. Körner CG, Wahle E.; ''Poly(A) tail shortening by a mammalian poly(A)-specific 3'-exoribonuclease.''; PubMed Europe PMC Scholia
  15. Houseley J, Tollervey D.; ''The many pathways of RNA degradation.''; PubMed Europe PMC Scholia
  16. Lau NC, Kolkman A, van Schaik FM, Mulder KW, Pijnappel WW, Heck AJ, Timmers HT.; ''Human Ccr4-Not complexes contain variable deadenylase subunits.''; PubMed Europe PMC Scholia
  17. Uchida N, Hoshino S, Katada T.; ''Identification of a human cytoplasmic poly(A) nuclease complex stimulated by poly(A)-binding protein.''; PubMed Europe PMC Scholia
  18. Gorgoni B, Gray NK.; ''The roles of cytoplasmic poly(A)-binding proteins in regulating gene expression: a developmental perspective.''; PubMed Europe PMC Scholia
  19. Gao M, Fritz DT, Ford LP, Wilusz J.; ''Interaction between a poly(A)-specific ribonuclease and the 5' cap influences mRNA deadenylation rates in vitro.''; PubMed Europe PMC Scholia
  20. Ozgur S, Chekulaeva M, Stoecklin G.; ''Human Pat1b connects deadenylation with mRNA decapping and controls the assembly of processing bodies.''; PubMed Europe PMC Scholia
  21. Zaric B, Chami M, Rémigy H, Engel A, Ballmer-Hofer K, Winkler FK, Kambach C.; ''Reconstitution of two recombinant LSm protein complexes reveals aspects of their architecture, assembly, and function.''; PubMed Europe PMC Scholia
  22. Borman AM, Michel YM, Malnou CE, Kean KM.; ''Free poly(A) stimulates capped mRNA translation in vitro through the eIF4G-poly(A)-binding protein interaction.''; PubMed Europe PMC Scholia
  23. Dupressoir A, Morel AP, Barbot W, Loireau MP, Corbo L, Heidmann T.; ''Identification of four families of yCCR4- and Mg2+-dependent endonuclease-related proteins in higher eukaryotes, and characterization of orthologs of yCCR4 with a conserved leucine-rich repeat essential for hCAF1/hPOP2 binding.''; PubMed Europe PMC Scholia
  24. Aström J, Aström A, Virtanen A.; ''Properties of a HeLa cell 3' exonuclease specific for degrading poly(A) tails of mammalian mRNA.''; PubMed Europe PMC Scholia
  25. Parker R, Song H.; ''The enzymes and control of eukaryotic mRNA turnover.''; PubMed Europe PMC Scholia
  26. Totaro A, Renzi F, La Fata G, Mattioli C, Raabe M, Urlaub H, Achsel T.; ''The human Pat1b protein: a novel mRNA deadenylation factor identified by a new immunoprecipitation technique.''; PubMed Europe PMC Scholia

History

View all...
CompareRevisionActionTimeUserComment
115026view16:56, 25 January 2021ReactomeTeamReactome version 75
113471view11:54, 2 November 2020ReactomeTeamReactome version 74
112670view16:06, 9 October 2020ReactomeTeamReactome version 73
101587view11:45, 1 November 2018ReactomeTeamreactome version 66
101123view21:29, 31 October 2018ReactomeTeamreactome version 65
100651view20:03, 31 October 2018ReactomeTeamreactome version 64
100201view16:48, 31 October 2018ReactomeTeamreactome version 63
99752view15:14, 31 October 2018ReactomeTeamreactome version 62 (2nd attempt)
99316view12:46, 31 October 2018ReactomeTeamreactome version 62
93995view13:50, 16 August 2017ReactomeTeamreactome version 61
93604view11:28, 9 August 2017ReactomeTeamreactome version 61
87169view19:22, 18 July 2016MkutmonOntology Term : 'pathway pertinent to DNA replication and repair, cell cycle, maintenance of genomic integrity, RNA and protein biosynthesis' added !
86710view09:24, 11 July 2016ReactomeTeamreactome version 56
83258view10:34, 18 November 2015ReactomeTeamVersion54
81369view12:53, 21 August 2015ReactomeTeamVersion53
76837view08:06, 17 July 2014ReactomeTeamFixed remaining interactions
76541view11:52, 16 July 2014ReactomeTeamFixed remaining interactions
75874view09:52, 11 June 2014ReactomeTeamRe-fixing comment source
75574view10:39, 10 June 2014ReactomeTeamReactome 48 Update
74929view13:45, 8 May 2014AnweshaFixing comment source for displaying WikiPathways description
74573view08:37, 30 April 2014ReactomeTeamNew pathway

External references

DataNodes

View all...
NameTypeDatabase referenceComment
7-MeGDPMetaboliteCHEBI:20794 (ChEBI)
7-MeGMPMetaboliteCHEBI:17825 (ChEBI)
AMPMetaboliteCHEBI:16027 (ChEBI)
CCR4-NOT ComplexComplexREACT_21110 (Reactome) The human CCR4-NOT complex contains 7 core subunits: CNOT1, CNOT2, CNOT3, CNOT9/RCD1, CNOT10, TAB182, and C2ORF29. Complexes contain either CNOT7 or CNOT8 (with CNOT8-containing complexes apparently involved in nuclear RNA splicing and CNOT7-containing complexes involved in cytoplasmic mRNA decay) and CNOT6 or CNOT6L. CNOT6 and CNOT6L are catalytic exoribonucleases. CNOT7 and CNOT8 also have ribonuclease activity. CNOT1 is the largest subunit and, based on yeast two-hybrid assays, interacts with CNOT2, CNOT7, CNOT8, and CNOT9, thus acting as a scaffold.
CMPMetaboliteCHEBI:17361 (ChEBI)
CNOT1 [cytosol]ProteinA5YKK6 (Uniprot-TrEMBL)
CNOT10 [cytosol]ProteinQ9H9A5 (Uniprot-TrEMBL)
CNOT11 [cytosol]ProteinQ9UKZ1 (Uniprot-TrEMBL)
CNOT2 [cytosol]ProteinQ9NZN8 (Uniprot-TrEMBL)
CNOT3 [cytosol]ProteinO75175 (Uniprot-TrEMBL)
CNOT4 [cytosol]ProteinO95628 (Uniprot-TrEMBL)
CNOT6 [cytosol]ProteinQ9ULM6 (Uniprot-TrEMBL)
CNOT6L [cytosol]ProteinQ96LI5 (Uniprot-TrEMBL)
CNOT7 [cytosol]ProteinQ9UIV1 (Uniprot-TrEMBL)
CNOT8 [cytosol]ProteinQ9UFF9 (Uniprot-TrEMBL)
DCP1-DCP2 Decapping ComplexComplexREACT_20836 (Reactome)
DCP1A [cytosol]ProteinQ9NPI6 (Uniprot-TrEMBL)
DCP1B(1-618) [cytosol]ProteinQ8IZD4 (Uniprot-TrEMBL)
DCP2 [cytosol]ProteinQ8IU60 (Uniprot-TrEMBL)
DCPS(1-337)ProteinQ96C86 (Uniprot-TrEMBL)
DDX6 [cytosol]ProteinP26196 (Uniprot-TrEMBL)
DIS3 [cytosol]ProteinQ9Y2L1 (Uniprot-TrEMBL)
Deadenylated mRNA:Lsm1-7 ComplexComplexREACT_20909 (Reactome)
Decapped mRNA:LSM1-7 ComplexComplexREACT_21085 (Reactome)
EDC3 [cytosol]ProteinQ96F86 (Uniprot-TrEMBL)
EDC4 [cytosol]ProteinQ6P2E9 (Uniprot-TrEMBL)
EIF4A1(1-406) [cytosol]ProteinP60842 (Uniprot-TrEMBL)
EIF4A2 [cytosol]ProteinQ14240 (Uniprot-TrEMBL)
EIF4A3 [cytosol]ProteinP38919 (Uniprot-TrEMBL)
EIF4B(2-118) [cytosol]ProteinP23588 (Uniprot-TrEMBL)
EIF4B(2-118)ProteinP23588 (Uniprot-TrEMBL)
EIF4E [cytosol]ProteinP06730 (Uniprot-TrEMBL)
EIF4EProteinP06730 (Uniprot-TrEMBL)
EIF4G1 [cytosol]ProteinQ04637 (Uniprot-TrEMBL)
EIF4G1ProteinQ04637 (Uniprot-TrEMBL)
EXOSC1 [cytosol]ProteinQ9Y3B2 (Uniprot-TrEMBL)
EXOSC2 [cytosol]ProteinQ13868 (Uniprot-TrEMBL)
EXOSC3 [cytosol]ProteinQ9NQT5 (Uniprot-TrEMBL)
EXOSC4 [cytosol]ProteinQ9NPD3 (Uniprot-TrEMBL)
EXOSC5 [cytosol]ProteinQ9NQT4 (Uniprot-TrEMBL)
EXOSC6 [cytosol]ProteinQ5RKV6 (Uniprot-TrEMBL)
EXOSC7 [cytosol]ProteinQ15024 (Uniprot-TrEMBL)
EXOSC8 [cytosol]ProteinQ96B26 (Uniprot-TrEMBL)
EXOSC9 [cytosol]ProteinQ06265 (Uniprot-TrEMBL)
Exosome ComplexComplexREACT_20841 (Reactome) The exosome complex comprises a ring and associated subunits. The ring contains EXOSC2, EXOSC7, EXOSC8, EXOSC9, EXOSC5, and EXOSC6. The subunits EXOSC1, EXOSC2, EXOSC3, and RRP44 bind the ring. The catalytic ribonuclease site is located in RRP44, which yields ribonucleotides having 5'-monophosphates.
GMPMetaboliteCHEBI:17345 (ChEBI)
H2OMetaboliteCHEBI:15377 (ChEBI)
LSM1 [cytosol]ProteinO15116 (Uniprot-TrEMBL)
LSM2 [cytosol]ProteinQ9Y333 (Uniprot-TrEMBL)
LSM3(2-102) [cytosol]ProteinP62310 (Uniprot-TrEMBL)
LSM4 [cytosol]ProteinQ9Y4Z0 (Uniprot-TrEMBL)
LSM5(2-91) [cytosol]ProteinQ9Y4Y9 (Uniprot-TrEMBL)
LSM6 [cytosol]ProteinP62312 (Uniprot-TrEMBL)
LSM7 [cytosol]ProteinQ9UK45 (Uniprot-TrEMBL)
Lsm1-7 ComplexComplexREACT_21014 (Reactome)
PABPC1 [cytosol]ProteinP11940 (Uniprot-TrEMBL)
PABPC1ProteinP11940 (Uniprot-TrEMBL)
PAIP1 [cytosol]ProteinQ9H074 (Uniprot-TrEMBL)
PAIP1ProteinQ9H074 (Uniprot-TrEMBL)
PAN2 [cytosol]ProteinQ504Q3 (Uniprot-TrEMBL)
PAN2-PAN3 ComplexComplexREACT_20697 (Reactome)
PAN3(1-741) [cytosol]ProteinQ58A45 (Uniprot-TrEMBL)
PARN [cytosol]ProteinO95453 (Uniprot-TrEMBL)
PARN homodimerComplexREACT_21052 (Reactome) Structural analysis has shown that PARN forms homodimers.
PATL1 [cytosol]ProteinQ86TB9 (Uniprot-TrEMBL)
Partially

Deadenylated mRNA

Complex		ComplexREACT_20682 (Reactome)
RQCD1 [cytosol]ProteinQ92600 (Uniprot-TrEMBL)
TNKS1BP1 [cytosol]ProteinQ9C0C2 (Uniprot-TrEMBL)
Translatable mRNA ComplexComplexREACT_21129 (Reactome) mRNA's that are ready for translation have a circular structure caused by interaction between PABP bound to the 3' poly(A) tail and the eIF4E-eIF4G-PAIP complex bound to the 7-methylguanosine cap. The interaction between poly(A)-PABP and the eIF4G-eIF4E complex stimulates affinity of eIF4E for the cap and improves translation.
UMPMetaboliteCHEBI:16695 (ChEBI)
XRN1ProteinQ8IZH2 (Uniprot-TrEMBL)
capped oligoribonucleotideREACT_20913 (Reactome)
eIF4AProteinREACT_21151 (Reactome)
mature mRNA

(eukaryotic, capped

and deadenylated)		REACT_20743 (Reactome) After deadenylation, mRNAs have 10-15 3' adenosine residues remaining of about 200 initial adenosine residues.
oligoribonucleotide

with a

5'-diphosphate		REACT_20778 (Reactome)

Annotated Interactions

View all...
SourceTargetTypeDatabase referenceComment
7-MeGDPArrowREACT_20560 (Reactome)
7-MeGMPArrowREACT_20556 (Reactome)
AMPArrowREACT_20533 (Reactome)
AMPArrowREACT_20588 (Reactome)
AMPArrowREACT_20606 (Reactome)
AMPArrowREACT_20651 (Reactome)
AMPArrowREACT_20662 (Reactome)
CCR4-NOT Complexmim-catalysisREACT_20651 (Reactome)
CMPArrowREACT_20533 (Reactome)
CMPArrowREACT_20588 (Reactome)
DCP1-DCP2 Decapping Complexmim-catalysisREACT_20560 (Reactome)
DCPS(1-337)mim-catalysisREACT_20556 (Reactome)
Deadenylated mRNA:Lsm1-7 ComplexArrowREACT_20540 (Reactome)
Deadenylated mRNA:Lsm1-7 ComplexREACT_20560 (Reactome)
Decapped mRNA:LSM1-7 ComplexArrowREACT_20560 (Reactome)
Decapped mRNA:LSM1-7 ComplexREACT_20533 (Reactome)
EIF4B(2-118)ArrowREACT_20651 (Reactome)
EIF4B(2-118)ArrowREACT_20662 (Reactome)
EIF4EArrowREACT_20651 (Reactome)
EIF4EArrowREACT_20662 (Reactome)
EIF4G1ArrowREACT_20651 (Reactome)
EIF4G1ArrowREACT_20662 (Reactome)
Exosome Complexmim-catalysisREACT_20588 (Reactome)
GMPArrowREACT_20533 (Reactome)
GMPArrowREACT_20588 (Reactome)
H2OREACT_20533 (Reactome)
H2OREACT_20556 (Reactome)
H2OREACT_20560 (Reactome)
H2OREACT_20588 (Reactome)
H2OREACT_20606 (Reactome)
H2OREACT_20651 (Reactome)
H2OREACT_20662 (Reactome)
Lsm1-7 ComplexArrowREACT_20533 (Reactome)
Lsm1-7 ComplexREACT_20540 (Reactome)
PABPC1ArrowREACT_20651 (Reactome)
PABPC1ArrowREACT_20662 (Reactome)
PAIP1ArrowREACT_20651 (Reactome)
PAIP1ArrowREACT_20662 (Reactome)
PAN2-PAN3 Complexmim-catalysisREACT_20606 (Reactome)
PARN homodimermim-catalysisREACT_20662 (Reactome)
Partially

Deadenylated mRNA

Complex		ArrowREACT_20606 (Reactome)
Partially

Deadenylated mRNA

Complex		REACT_20651 (Reactome)
Partially

Deadenylated mRNA

Complex		REACT_20662 (Reactome)
REACT_20533 (Reactome) The XRN1 exoribonuclease hydrolyzes decapped mRNA from 5' to 3' and yields ribonucleotides having 5'-monophosphates. In yeast Xrn1 associates with the Lsm1-7 complex.
REACT_20540 (Reactome) The Lsm1-7 complex forms a heptameric ring that binds the 3' oligoadenylated ends of mRNAs that have been deadenylated. The bound Lsm1-7 may prevent access of the exosome (a 3' to 5' exonuclease) to the 3' end and thereby direct the mRNA to the 5' to 3' exonuclease pathway. The yeast Lsm1-7 complex has a preference for oligoadenylated RNA compared to polyadenylated RNA, however other determinants of binding by Lsm1-7 are unknown.
REACT_20556 (Reactome) The scavenging nuclease DCPS hydrolyzes the triphosphate bond between the 7-methylguanosine cap and the remaining oligoribonucleotide body of the mRNA. The products are 7-methylguanosine 5'-monophosphate and an oligoribonucleotide with a 5'-diphosphate.
REACT_20560 (Reactome) The DCP1-DCP2 decapping complex binds the 7-methylguanosine cap of mRNA and hydrolyzes the triphosphate bond to yield 7-methylguanosine 5'-diphosphate and RNA with 5'-monophosphate. The DCP2 subunit of the complex catalyzes the hydrolysis. DCP2 has higher affinity for some subsets of mRNA.
REACT_20588 (Reactome) The exosome complex hydrolyzes capped, deadenylated mRNA from 3' to 5' and yields ribonucleotides having 5'-monophosphates. In yeast the Ski2-Ski3-Ski8 complex assists degradation by the exosome complex, however little is known about the function of the homologous Ski complex in mammals. Although many exosomal components contain exonuclease signatures, only two components have been shown to degrade RNA. Rrp6/PMSCL-100 has been shown to be involved in the 3’-5’ decay of nuclear mRNAs in yeast. Rrp6 may also function in the absence of the core exosomal components. The Rrp44/dDis3 component of the core exosome has been shown to possess both 3’-5’ exonuclease activity along with endonuclease activity via its PIN domain.
REACT_20606 (Reactome) The PAN2-PAN3 exoribonuclease complex hydrolyzes the poly(A) tail of a mRNA, shortening the tail from about 200 adenosine residues to about 80 adenosine residues and yielding adenosine 5'-monophosphate. PAN2 is the exoribonuclease component of the complex; PAN3 is required for cellular localization. The poly(A)-binding protein (PABP) interacts with PAN3 and recruits the PAN2-PAN3 complex to mRNA.
REACT_20651 (Reactome) The CCR4-NOT complex hydrolyzes adenosine residues at the 3' end of polyadenylated mRNA, shortening the number of adenosine residues to about 10-15 residues and yielding adenosine 5'-monophosphate. CNOT6 and CNOT6L are the exoribonucleases responsible for hydrolysis. Activity of the CCR4-NOT complex is inhibited by PABP bound to the poly(A) tail of the mRNA. The trigger for activation of deadenylation by the CCR4-NOT complex is unknown. Complexes containing CNOT7 rather than CNOT8 appear to be responsible for cytoplasmic mRNA decay.
REACT_20662 (Reactome) The PARN exoribonuclease hydrolyzes adenosine residues at the 3' ends of polyadenylated mRNA, shortening the poly(A) tail from about 80 adenosine residues to about 10-15 residues and yielding adenosine 5'-monophosphate. PARN interacts simultaneously with the poly(A) tail and with the 7-methylguanosine cap of the mRNA, therefore it is believed that PARN displaces the eIF4F cap-binding complex. The trigger for deadenylation by PARN is unknown. PARN is also part of a complex that regulates poly(A) tail length and hence translation in developing oocytes.
Translatable mRNA ComplexREACT_20606 (Reactome)
UMPArrowREACT_20533 (Reactome)
UMPArrowREACT_20588 (Reactome)
XRN1mim-catalysisREACT_20533 (Reactome)
capped oligoribonucleotideArrowREACT_20588 (Reactome)
capped oligoribonucleotideREACT_20556 (Reactome)
eIF4AArrowREACT_20651 (Reactome)
eIF4AArrowREACT_20662 (Reactome)
mature mRNA

(eukaryotic, capped

and deadenylated)		ArrowREACT_20651 (Reactome)
mature mRNA

(eukaryotic, capped

and deadenylated)		ArrowREACT_20662 (Reactome)
mature mRNA

(eukaryotic, capped

and deadenylated)		REACT_20540 (Reactome)
mature mRNA

(eukaryotic, capped

and deadenylated)		REACT_20588 (Reactome)
oligoribonucleotide

with a

5'-diphosphate		ArrowREACT_20556 (Reactome)
Retrieved from "https://classic.wikipathways.org/index.php/Pathway:WP2659"
Personal tools