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Orjalo AV, Bhaumik D, Gengler BK, Scott GK, Campisi J.; ''Cell surface-bound IL-1alpha is an upstream regulator of the senescence-associated IL-6/IL-8 cytokine network.''; PubMedEurope PMCScholia
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Zou L, Stillman B.; ''Assembly of a complex containing Cdc45p, replication protein A, and Mcm2p at replication origins controlled by S-phase cyclin-dependent kinases and Cdc7p-Dbf4p kinase.''; PubMedEurope PMCScholia
Zhang Y, Xiong Y, Yarbrough WG.; ''ARF promotes MDM2 degradation and stabilizes p53: ARF-INK4a locus deletion impairs both the Rb and p53 tumor suppression pathways.''; PubMedEurope PMCScholia
Ikeda O, Miyasaka Y, Sekine Y, Mizushima A, Muromoto R, Nanbo A, Yoshimura A, Matsuda T.; ''STAP-2 is phosphorylated at tyrosine-250 by Brk and modulates Brk-mediated STAT3 activation.''; PubMedEurope PMCScholia
Hsu JY, Reimann JD, Sørensen CS, Lukas J, Jackson PK.; ''E2F-dependent accumulation of hEmi1 regulates S phase entry by inhibiting APC(Cdh1).''; PubMedEurope PMCScholia
Wohlschlegel JA, Dwyer BT, Dhar SK, Cvetic C, Walter JC, Dutta A.; ''Inhibition of eukaryotic DNA replication by geminin binding to Cdt1.''; PubMedEurope PMCScholia
Dou QP, Zhao S, Levin AH, Wang J, Helin K, Pardee AB.; ''G1/S-regulated E2F-containing protein complexes bind to the mouse thymidine kinase gene promoter.''; PubMedEurope PMCScholia
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Takahashi A, Imai Y, Yamakoshi K, Kuninaka S, Ohtani N, Yoshimoto S, Hori S, Tachibana M, Anderton E, Takeuchi T, Shinkai Y, Peters G, Saya H, Hara E.; ''DNA damage signaling triggers degradation of histone methyltransferases through APC/C(Cdh1) in senescent cells.''; PubMedEurope PMCScholia
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Lukong KE, Huot ME, Richard S.; ''BRK phosphorylates PSF promoting its cytoplasmic localization and cell cycle arrest.''; PubMedEurope PMCScholia
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Jimi E, Ikebe T, Takahashi N, Hirata M, Suda T, Koga T.; ''Interleukin-1 alpha activates an NF-kappaB-like factor in osteoclast-like cells.''; PubMedEurope PMCScholia
Shen CH, Chen HY, Lin MS, Li FY, Chang CC, Kuo ML, Settleman J, Chen RH.; ''Breast tumor kinase phosphorylates p190RhoGAP to regulate rho and ras and promote breast carcinoma growth, migration, and invasion.''; PubMedEurope PMCScholia
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Magenta A, Fasanaro P, Romani S, Di Stefano V, Capogrossi MC, Martelli F.; ''Protein phosphatase 2A subunit PR70 interacts with pRb and mediates its dephosphorylation.''; PubMedEurope PMCScholia
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Coulonval K, Bockstaele L, Paternot S, Dumont JE, Roger PP.; ''The cyclin D3-CDK4-p27kip1 holoenzyme in thyroid epithelial cells: activation by TSH, inhibition by TGFbeta, and phosphorylations of its subunits demonstrated by two-dimensional gel electrophoresis.''; PubMedEurope PMCScholia
Chung M, Liu C, Yang HW, Köberlin MS, Cappell SD, Meyer T.; ''Transient Hysteresis in CDK4/6 Activity Underlies Passage of the Restriction Point in G1.''; PubMedEurope PMCScholia
Ostrander JH, Daniel AR, Lofgren K, Kleer CG, Lange CA.; ''Breast tumor kinase (protein tyrosine kinase 6) regulates heregulin-induced activation of ERK5 and p38 MAP kinases in breast cancer cells.''; PubMedEurope PMCScholia
Yang BS, Hauser CA, Henkel G, Colman MS, Van Beveren C, Stacey KJ, Hume DA, Maki RA, Ostrowski MC.; ''Ras-mediated phosphorylation of a conserved threonine residue enhances the transactivation activities of c-Ets1 and c-Ets2.''; PubMedEurope PMCScholia
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Gambus A, van Deursen F, Polychronopoulos D, Foltman M, Jones RC, Edmondson RD, Calzada A, Labib K.; ''A key role for Ctf4 in coupling the MCM2-7 helicase to DNA polymerase alpha within the eukaryotic replisome.''; PubMedEurope PMCScholia
Yan Z, DeGregori J, Shohet R, Leone G, Stillman B, Nevins JR, Williams RS.; ''Cdc6 is regulated by E2F and is essential for DNA replication in mammalian cells.''; PubMedEurope PMCScholia
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Meng W, Swenson LL, Fitzgibbon MJ, Hayakawa K, Ter Haar E, Behrens AE, Fulghum JR, Lippke JA.; ''Structure of mitogen-activated protein kinase-activated protein (MAPKAP) kinase 2 suggests a bifunctional switch that couples kinase activation with nuclear export.''; PubMedEurope PMCScholia
Zhou BP, Liao Y, Xia W, Spohn B, Lee MH, Hung MC.; ''Cytoplasmic localization of p21Cip1/WAF1 by Akt-induced phosphorylation in HER-2/neu-overexpressing cells.''; PubMedEurope PMCScholia
Ezhevsky SA, Ho A, Becker-Hapak M, Davis PK, Dowdy SF.; ''Differential regulation of retinoblastoma tumor suppressor protein by G(1) cyclin-dependent kinase complexes in vivo.''; PubMedEurope PMCScholia
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Viglietto G, Motti ML, Bruni P, Melillo RM, D'Alessio A, Califano D, Vinci F, Chiappetta G, Tsichlis P, Bellacosa A, Fusco A, Santoro M.; ''Cytoplasmic relocalization and inhibition of the cyclin-dependent kinase inhibitor p27(Kip1) by PKB/Akt-mediated phosphorylation in breast cancer.''; PubMedEurope PMCScholia
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Kamalati T, Jolin HE, Fry MJ, Crompton MR.; ''Expression of the BRK tyrosine kinase in mammary epithelial cells enhances the coupling of EGF signalling to PI 3-kinase and Akt, via erbB3 phosphorylation.''; PubMedEurope PMCScholia
Blomberg I, Hoffmann I.; ''Ectopic expression of Cdc25A accelerates the G(1)/S transition and leads to premature activation of cyclin E- and cyclin A-dependent kinases.''; PubMedEurope PMCScholia
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Wu CL, Kirley SD, Xiao H, Chuang Y, Chung DC, Zukerberg LR.; ''Cables enhances cdk2 tyrosine 15 phosphorylation by Wee1, inhibits cell growth, and is lost in many human colon and squamous cancers.''; PubMedEurope PMCScholia
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The pRB C-terminus contains a cluster of seven candidate in vivo cdk phosphorylation sites (residues 795, 807, 811, 821, and 826) and is phosphorylated in vitro by cyclin A, cyclin E, and cyclin D-associated kinases.
At the beginning of this reaction, 1 molecule of 'phospho-Retinoblastoma protein', and 1 molecule of 'RNA primer-DNA primer:origin duplex with DNA damage' are present. At the end of this reaction, 1 molecule of 'Rb1:RNA primer-DNA primer:origin duplex with DNA damage' is present.
This reaction takes place in the 'nucleus' and is mediated by the 'phosphoprotein phosphatase activity' of 'PP2A'.
At the beginning of this reaction, 1 molecule of 'RNA primer-DNA primer:origin duplex' is present. At the end of this reaction, 1 molecule of 'DNA polymerase alpha:primase', and 1 molecule of 'RNA primer-DNA primer:origin duplex with DNA damage' are present.
This event is inferred from the fission yeast. Cyclin B activity is thought to inhibit pre-RC formation by first associating with ORC during DNA replication.
This set of events is inferred from annotated events in Drosophila.
Rb1 is normally hyperphosphorylated by CycD/CDK4/CDK6 and Cyclin E/CDK2 for transition into S-phase. PP2A can then reverse this reaction, in this case, in response to DNA damage induced checkpoint.
At G1 entry from G0, p130 (RBL2) is phosphorylated on three threonine and serine residues by cyclin D1 dependent kinases CDK4 and/or CDK6, leading to dissociation of p130 (RBL2) from complexes it formed with E2F4 or E2F5 and DP1 or DP2. This is thought to promote translocation of E2F4 and E2F5, which lack nuclear localization signals, to the cytosol, allowing activating E2Fs (E2F1, E2F2 and E2F3) to bind E2F promoters and activate transcription of genes needed for G1 progression.
In late G1, cyclin D dependent kinases CDK4 and CDK6 phosphorylate RBL1 (p107) on four serine and threonine residues (S964, S975, T369 and S640), leading to dissociation of phosphorylated RBL1 (p107) from E2F4 in complex with either DP-1 or DP-2. E2F4, which lacks nuclear localization signal, is then thought to translocate to the cytosol, allowing E2F promoter sites to become occupied by activating E2Fs (E2F1, E2F2, and E2F3), resulting in transcription of E2F targets needed for cell cycle progression.
p130 (RBL2) in complex with E2F4 or E2F5 and DP1 or DP2 recruits histone deacetylase HDAC1, probably in complex with other chromatin modification factors, and represses transcription of E2F target promoters during G0 in quiescent cells.
p107 (RBL1) in complex with E2F4 and DP1 or DP2 recruits histone deacetylase HDAC1 (possibly in complex with other chromatin modification proteins) through LXCXE-like motif, shared by pocket proteins, to repress transcription of E2F target genes in early G1.
In G0 and early G1, p130 (RBL2) bound to E2F4 or E2F5 and DP1 or DP2 associates with the MuvB complex, consisting of LIN9, LIN37, LIN52, LIN54 and RBBP4 to form evolutionarily conserved DREAM complex. Phosphorylation of LIN52 on serine residue S28 is critical for association of MuvB complex with p130 (RBL2).
LIN52 subunit of MuvB complex is phosphorylated by the protein kinase DYRK1A on the serine residue S28, promoting association of MuvB with p130 (RBL2). From model organism studies, DYRK proteins are known to function in cell cycle regulation, differentiation and stress response.
In G0 and early G1, expression of E2F target genes such as Cyclin A, E2F1, CDC2 and MYBL2 is inhibited by complexes containing p130 (RBL2) and p107 (RBL1), respectively, and histone deacetylase HDAC1.
Dephosphorylation of p107 (RBL1) by PP2A complex containing either PPP2R3B (B" beta) or PPP2R2A (B alpha) regulatory subunit plays a role in maintaining the equilibrium of hyperphosphorylated and hypophosphorylated p107 (RBL1), through counteracting action of cyclin dependent kinases (CDKs) throughout the cell cycle. It is assumed that PP2A dephosphorylates p107 (RBL1) on all four phosphorylation sites, but further experiments are needed to confirm this.
Dephosphorylation of p130 (RBL2) by PP2A complex containing either PPP2R3B (B" beta) or PPP2R2A (B alpha) regulatory subunit plays a role in maintaining the equilibrium of hyperphosphorylated and hypophosphorylated p130 (RBL2), through counteracting action of cyclin dependent kinases (CDKs). It is assumed that PP2A dephosphorylates p130 (RBL2) on all three phosphorylation sites, but further experiments are needed to confirm this.
p130 (RBL2) in complex with E2F4/5 and DP1/2 binds to cyclin A or cyclin E in complex with CDK2 through its conserved LFG pocket domain motif and amino terminus, leading to inhibition of CDK2 kinase activity and suppression of cellular growth.
p130 (RBL2) is able to bind complexes of CDK2 with either cyclin A or cyclin E through the cyclin-binding LFG motif within the pocket domain, which is conserved in p107 (RBL1) and p21/WAF1/Cip1 family of cyclin-dependent kinases. In addition to LFG motif, amino terminal region of p130 (RBL2), conserved in p107 (RBL1), is necessary for inhibition of CDK2 kinase activity. Presence of E2F is not required for this interaction.
p107 (RBL1) in complex with E2F4 and DP1/2 binds to cyclin A or cyclin E in complex with CDK2 through its conserved LFG pocket domain motif and amino terminus, leading to inhibition of CDK2 kinase activity and suppression of cellular growth.
p107 (RBL1) is able to bind complexes of CDK2 with either cyclin A or cyclin E, through cyclin-binding LFG motif in the pocket domain, which is conserved in p130 (RBL2) and p21/WAF1/Cip1 family of cyclin-dependent kinase inhibitors. In addition to the LFG motif, the amino terminal sequence conserved in the p107 (RBL1) and p130 (RBL2) is needed for inhibition of CDK2 kinase activity. Presence of E2F is not required for this interaction.
Phosphorylated p130 (RBL2) binds SCF (Skp2) ubiquitin ligase in complex with Cks1. Phosphorylation of p130 (RBL2) serine residue S672 by CDK4/6 is critical for this interaction.
As quiescent G0 cells reenter the cell cycle, p130 (RBL2) is phosphorylated by CDK4/6. This phosphorylated p130 (RBL2) binds ubiquitin ligase SCF (Skp2) in complex with Cks1, and is subsequently ubiquitinated and degraded similarly to p27, which is another target of SCF (Skp2).
Prior to mitogen activation, the inhibitory proteins, INK4 (p15, p16, p18, and p19) associate with the catalytic domain of free CDK4/6, preventing its association with cyclins, and thus its activation.
p27 translocates to the nucleoplasm where it associates with CyclinE:Cdk2 complexes. Localization of p27 to the nucleus is necessary to inhibit Cdk activation by Cdk-activating kinase.
The interaction between the Skp2 subunit of the SCF(Skp2) complex and p27 is dependent upon Cdk2:Cyclin A/E mediated phosphorylation of p27 at Thr 187 (Carrano et al, 1999; Tsvetkov et al, 1999). There is evidence that Cyclin A/B:Cdk1 can also bind and phosphorylate p27 on Thr 187 (Nakayama et al., 2004). This phosphorylation is also essential for the subsequent ubiquitination of p27.
The accessory protein, Cks1 promotes efficient interaction between phosphorylated p27 and the SCF (Skp2) complex (Ganoth et al., 2001; Spruck et al., 2001). Cks1 binds to Skp2 in the leucine-rich repeat (LRR) domain and C-terminal tail (Hao et al., 2005). The phosphorylated Thr187 side chain of p27 associates with a phosphate binding site on Cks1, and the side chain containing Glu185 is positioned in the interface between Skp2 and Cks1 where it interacts with both (Hao et al., 2005).
Phosphorylation of cyclin-dependent kinases (CDKs) by the CDK-activating kinase (CAK) is required for the activation of the CDK kinase activity. The association of p21/p27 with the Cyclin A/E:Cdk2 complex prevents CAK mediated phosphorylation of Cdk2 (Aprelikova et al., 1995).
pRB contains, in its C terminus, a cyclin-cdk interaction motif like that found in E2F1 and p21 that enables it to be recognized and phosphorylated by cyclin-cdk complexes.
E2F1 binds to E2F binding sites on the genome activating the synthesis of the target proteins. For annotation purposes, the reactions regulated by E2F1 are grouped under this pathway and information about the target genes alone are displayed for annotation purposes. Cellular targets for activation by E2F1 include thymidylate synthetase, Rir2, Dihydrofolate reductase, Cdc2, Cyclin A1, Cdc6 (DeGregori et al., 1995), Cdt1 (Yoshida and Inoue, 2004), CDC45 (Arata et al., 2000), CDC6 (Yan et al., 1998; Ohtani et al., 1998), Cyclin E (Ohtani et al., 1996), Emi1 (Hsu et al., 2002), and Orc1 (Ohtani et al., 1997). The activation of TK2 (Dnk1) and Cdc25A by E2F1 have been inferred from similar events in Drosophila (Duronio and O'Farrell, 1994;Reis and Edgar, 2004). Rir2 protein is involved in dNTP level regulation and activation of this enzyme results in higher levels of dNTPs in anticipation of S-phase. E2F activation of Rir2 has been shown also in Drosophila by Duronio and O'Farrell (1994). E2F1 activation of CDC45 is shown in mouse cells by using human E2F1 construct (Arata et al., 2000). Cyclin E is also transcriptionally regulated by E2F1. Cyclin E protein plays important role in the transition of G1 in S-phase by associating with Cdk2 (Ohtani et al., 1996). E2F activation of PCNA has been demonstrated in Drosophila (DeGregori et al., 1995) and in some human cells by using recombinant adenovirus constructs. E2F activation of Polymerase A (Pol A) has been demonstrated in some human cells. It has also been demonstrated in Drosophila by Ohtani and Nevins (1994). It has been observed in Drosophila that E2F1 regulated expression of Orc1 stimulates ORC1-6 complex formation and binding to the origin of replication (Asano and Wharton, 1999). Orc1-6 recruit Cdc6 and Cdt1 that are required to recruit the MCM2-7 replication helicases. E2F1 regulation incorporates a feedback mechanism where in Geminin can inhibit MCM2-7 recruitment of ORC1-6 complex by interacting with Cdc6/Cdt1. The activation of Cdc25A and TK2 (Dnk1) by E2F1 has been inferred from similar events in Drosophila (Duronio RJ, O'Farrell 1994; Reis and Edgar, 2004). E2F1 activates string (Cdc25) that in turn activates Cyclin B/Cdk1. A similar phenomenon has been observed in mouse NIH 3T3 cells and in Rat1 cells.
DNA polymerase alpha:primase is comprised of four subunits, p180, p70, p58, and p49. The two primase subunits, p58 and p49, form a tight complex. The p49 subunit contains the DNA primase activity and one role of p58 appears to be tethering p49 to p180, the DNA polymerase catalytic subunit. The fourth subunit, p70, binds p180 and may tether the DNA polymerase alpha:primase complex to Cdc45.
After pre-RC assembly and Cdc45 association with the origin of replication, Replication Protein A (RPA) also associates with chromatin. RPA is a heterotrimeric complex containing p70, p34, and p11 subunits, and also is required for DNA recombination and DNA repair. The p70 subunit of RPA binds to the primase subunits of Pol alpha:primase. The p70 and p34 subunits of RPA are phosphorylated in a cell cycle-dependent manner. RPA is a single-strand DNA (ssDNA) binding protein and its association with chromatin at this stage suggests that DNA is partially unwound. This suggestion has been confirmed by detection of ssDNA in budding yeast origins of replication using chemical methods.
Once the Mcm2-7 complex has been assembled onto the origin of replication, the next step is the assembly of Cdc45, an essential replication protein, in late G1. The assembly of Cdc45 onto origins of replication forms a complex distinct from the pre-replicative complex, sometimes called the pre-initiation complex. The assembly of Cdc45 onto origins correlates with the time of initiation. Like the Mcm2-7 proteins, Cdc45 binds specifically to origins in the G1 phase of the cell cycle and then to non-origin DNA during S phase and is therefore thought to travel with the replication fork. Indeed, S. cerevisiae Cdc45 is required for DNA replication elongation as well as replication initiation. Cdc45 is required for the association of alpha DNA polymerase:primase with chromatin. Based on this observation and the observation that in S. cerevisiae, cCdc45 has been found in large complexes with some components of Mcm2-7 complex, it has been suggested that Cdc45 plays a scaffolding role at the replication fork, coupling Pol-alpha:primase to the replication fork through the helicase. Association of Cdc45 with origin DNA is regulated in the cell cycle and its association is dependent on the activity of cyclin-dependent kinases but not the Cdc7/Dbf4 kinase. In Xenopus egg extracts, association of Cdc45 with chromatin is dependent on Xmus101. TopBP1, the human homolog of Xmus1, is essential for DNA replication and interacts with DNA polymerase epsilon, one of the polymerases involved in replicating the genome. TopBP1 homologs have been found in S. cerevisiae and S. pombe. Sld3, an additional protein required for Cdc45 association with chromatin in S. cerevisiae and S. pombe, has no known human homolog.
At the beginning of this reaction, 1 molecule of 'Mcm10:active pre-replicative complex', 1 molecule of 'DDK', and 1 molecule of 'CDK' are present. At the end of this reaction, 1 molecule of 'CDK:DDK:Mcm10:pre-replicative complex' is present.
MCM10 is required for human DNA replication. In S. cerevisiae, Mcm10, like Mcm2-7, is required for minichromosome maintenance, but Mcm10 has no sequence homology with these other proteins (Merchant et al., 1997). Genetic studies have demonstrated that Mcm10 is required for DNA replication in S. pombe (Aves et al., 1998) and S. cerevisiae cells (Homesley et al., 2000) and immunodepletion of XlMcm10 interferes with DNA replication in Xenopus egg extracts (Wohlschlegel et al., 2002). Human Mcm10 interacts with chromatin in G1 phase and then dissociates during G2 phase. In S. cerevisiae, Mcm10 has been shown to localize to origins during G1 (Ricke and Bielinsky, 2004), and it may stabilize the association of Mcm2-7 with the pre-replicative complex (Sawyer et al., 2004). This timing of association is consistent with studies that demonstrate that, in Xenopus egg extracts, Mcm10 is required for association of Cdc45, but not Mcm2-7 with chromatin. Biochemical evidence that Mcm10 plays a direct role in the activation of the pre-replicative complex includes the requirement for SpMcm10 in the phosphorylation of the Mcm2-7 complex by DDK (Lee et al., 2004) and the fact that SpMcm10 binds and stimulates DNA polymerase alpha activity (Fien et al., 2004).
At the beginning of this reaction, 1 molecule of 'Mcm10:pre-replicative complex' is present. At the end of this reaction, 1 molecule of 'Mcm10:active pre-replicative complex', and 1 molecule of 'CDT1' are present.
At the beginning of this reaction, 1 molecule of 'Mcm2-7 complex', and 1 molecule of 'ATP' are present. At the end of this reaction, 1 molecule of 'phosphorylated Mcm2-7 complex', and 1 molecule of 'ADP' are present.
This reaction takes place in the 'nucleus' and is mediated by the 'kinase activity' of 'DDK'.
At the beginning of this reaction, 1 molecule of 'origin of replication', and 1 molecule of 'DNA polymerase epsilon' are present. At the end of this reaction, 1 molecule of 'DNA polymerase epsilon:origin complex' is present.
The E-type cyclins and Cyclin Dependent Kinase 2 control the transition from G1 to S phase. Cdk2 is competent to carry out the necessary reactions only when complexed with Cyclin E.
The formation of CyclinD:CDK4/6 complexes is promoted by two proteins, p21Cip1/Waf1 and p27kip1. Activity of the cyclin-dependent kinases 4 and 6 can be inhibited by the binding of several small CDK-inhibitory proteins (CKIs).
During G1, the activity of cyclin-dependent kinases (CDKs) is controlled by the CDK inhibitors (CKIs) CDKN1A (p21) and CDKN1B (p27), thereby preventing premature entry into S phase (see Guardavaccaro and Pagano, 2006). The efficient recognition and ubiquitination of p27 by the SCF (Skp2) complex requires the formation of a trimeric complex containing p27 and cyclin E/A:Cdk2.
At the beginning of this reaction, 1 molecule of 'ATP', and 1 molecule of 'Cyclin E1:Cdk2 complex' are present. At the end of this reaction, 1 molecule of 'Cyclin E1:phospho-Cdk2 complex', and 1 molecule of 'ADP' are present.
This reaction takes place in the 'nucleoplasm' and is mediated by the 'kinase activity' of 'Myt1 kinase'.
At the beginning of this reaction, 1 molecule of 'Cyclin E2:Cdk2 complex', and 1 molecule of 'ATP' are present. At the end of this reaction, 1 molecule of 'Cyclin E2:phospho-Cdk2 complex', and 1 molecule of 'ADP' are present.
This reaction takes place in the 'nucleoplasm' and is mediated by the 'kinase activity' of 'Myt1 kinase'.
Activated PTK6 (BRK) binds to CDKN1B (p27KIP1) that is in a complex with CDK4 and cyclin D1 (CCND1). Since PTK6 increases cyclin E1 (CCNE1) levels downstream of ERBB2 while decreasing CDKN1B levels, PTK6 probably also associates with CDKN1B bound to the complex of CCNE1 and CDK2 (Xiang et al. 2008).
PTK6 (BRK) phosphorylates CDKN1B (p27KIP1) bound to the complex of CDK4 and CCND1 (cyclin D1) on tyrosine residue Y88 and possibly other tyrosines (e.g. Y89) (Patel et al. 2015). Based on the finding that PTK6 promotes ERBB2-induced increase in cyclin E1 (CCNE1) levels and decrease in CDKN1B levels (Xiang et al. 2008), and supported by the analogy with other SRC family kinases that phosphorylate CDKN1B (Grimmler et al. 2007), PTK6 is likely to also phosphorylate CDKN1B bound to the complex of CCNE1 and CDK2. Phosphorylation of CDKN1B (p27KIP1) on tyrosine residue Y88 by SRC family kinases dislodges the 3-10 helix of CDKN1B from the active site of CDK2 or CDK4, thus converting CDKN1B from a bound inhibitor to a bound non-inhibitor (Grimmler et al. 2007, Ray et al. 2009).
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DataNodes
pre-replicative
complex:CDC45:RPA1-4pre-replicative
complex:CDC45pre-replicative
complexB:CDK1:ORC:origin
of replicationalpha:primase:DNA polymerase alpha:origin
complexepsilon:origin
complexpre-replicative
complexprimer:origin duplex with DNA
damageprimer:origin duplex with DNA
damageprimer:origin
duplexAnnotated Interactions
pre-replicative
complex:CDC45:RPA1-4pre-replicative
complex:CDC45:RPA1-4pre-replicative
complex:CDC45:RPA1-4pre-replicative
complex:CDC45pre-replicative
complex:CDC45pre-replicative
complexpre-replicative
complexB:CDK1:ORC:origin
of replicationalpha:primase:DNA polymerase alpha:origin
complexepsilon:origin
complexepsilon:origin
complexpre-replicative
complexpre-replicative
complexThis reaction takes place in the 'nucleus' and is mediated by the 'phosphoprotein phosphatase activity' of 'PP2A'.
This reaction takes place in the 'nucleus'.
This reaction takes place in the 'nucleus'.
Rb1 is normally hyperphosphorylated by CycD/CDK4/CDK6 and Cyclin E/CDK2 for transition into S-phase. PP2A can then reverse this reaction, in this case, in response to DNA damage induced checkpoint.
Cellular targets for activation by E2F1 include thymidylate synthetase, Rir2, Dihydrofolate reductase, Cdc2, Cyclin A1, Cdc6 (DeGregori et al., 1995), Cdt1 (Yoshida and Inoue, 2004), CDC45 (Arata et al., 2000), CDC6 (Yan et al., 1998; Ohtani et al., 1998), Cyclin E (Ohtani et al., 1996), Emi1 (Hsu et al., 2002), and Orc1 (Ohtani et al., 1997). The activation of TK2 (Dnk1) and Cdc25A by E2F1 have been inferred from similar events in Drosophila (Duronio and O'Farrell, 1994;Reis and Edgar, 2004).
Rir2 protein is involved in dNTP level regulation and activation of this enzyme results in higher levels of dNTPs in anticipation of S-phase. E2F activation of Rir2 has been shown also in Drosophila by Duronio and O'Farrell (1994). E2F1 activation of CDC45 is shown in mouse cells by using human E2F1 construct (Arata et al., 2000). Cyclin E is also transcriptionally regulated by E2F1. Cyclin E protein plays important role in the transition of G1 in S-phase by associating with Cdk2 (Ohtani et al., 1996). E2F activation of PCNA has been demonstrated in Drosophila (DeGregori et al., 1995) and in some human cells by using recombinant adenovirus constructs. E2F activation of Polymerase A (Pol A) has been demonstrated in some human cells. It has also been demonstrated in Drosophila by Ohtani and Nevins (1994). It has been observed in Drosophila that E2F1 regulated expression of Orc1 stimulates ORC1-6 complex formation and binding to the origin of replication (Asano and Wharton, 1999). Orc1-6 recruit Cdc6 and Cdt1 that are required to recruit the MCM2-7 replication helicases. E2F1 regulation incorporates a feedback mechanism where in Geminin can inhibit MCM2-7 recruitment of ORC1-6 complex by interacting with Cdc6/Cdt1. The activation of Cdc25A and TK2 (Dnk1) by E2F1 has been inferred from similar events in Drosophila (Duronio RJ, O'Farrell 1994; Reis and Edgar, 2004). E2F1 activates string (Cdc25) that in turn activates Cyclin B/Cdk1. A similar phenomenon has been observed in mouse NIH 3T3 cells and in Rat1 cells.
This reaction takes place in the 'nucleus'.
This reaction takes place in the 'nucleus'.
This reaction takes place in the 'nucleus' and is mediated by the 'kinase activity' of 'DDK'.
This reaction takes place in the 'nucleoplasm' and is mediated by the 'kinase activity' of 'Myt1 kinase'.
This reaction takes place in the 'nucleoplasm' and is mediated by the 'kinase activity' of 'Myt1 kinase'.
primer:origin duplex with DNA
damageprimer:origin duplex with DNA
damageprimer:origin duplex with DNA
damageprimer:origin duplex with DNA
damageprimer:origin
duplex