Search results for RBL1

Showing 20 results out of 42

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Species

Types

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Protein (2 results from a total of 2)

Identifier: R-HSA-389104
Species: Homo sapiens
Compartment: nucleoplasm
Primary external reference: UniProt: RBL1: P28749
Identifier: R-HSA-1226085
Species: Homo sapiens
Compartment: nucleoplasm
Primary external reference: UniProt: RBL1: P28749

DNA Sequence (1 results from a total of 1)

Identifier: R-HSA-8964489
Species: Homo sapiens
Compartment: nucleoplasm
Primary external reference: ENSEMBL: ENSG00000080839

Reaction (5 results from a total of 19)

Identifier: R-HSA-8964492
Species: Homo sapiens
Compartment: nucleoplasm
The DREAM complex binds the RBL1 (p107) gene promoter (Litovchick et al. 2007).
Identifier: R-HSA-8964525
Species: Homo sapiens
Compartment: nucleoplasm
The DREAM complex directly represses transcription of the RBL1 gene (Litovchick et al. 2007).
Identifier: R-HSA-8964588
Species: Homo sapiens
Compartment: nucleoplasm
In G0 and early G1, complexes containing p130 (RBL2) and p107 (RBL1), respectively, and histone deacetylase HDAC1 bind the promoter of the CCNA2 gene (Rayman et al. 2002).
Identifier: R-HSA-8978926
Species: Homo sapiens
Compartment: nucleoplasm
In G0 and early G1, complexes containing p130 (RBL2) and p107 (RBL1), respectively, and histone deacetylase HDAC1 directly inhibit transcription from the MYBL2 gene (Rayman et al. 2002).
Identifier: R-HSA-8964513
Species: Homo sapiens
Compartment: nucleoplasm
Transcription of the E2F1 gene is directly inhibited by the DREAM complex (Litovchick et al. 2007). E2F1 transcription is also directly inhibited by the complex of HDAC1 and RBL1 (p107) or RBL2 (p130) (Rayman et al. 2002).

Set (2 results from a total of 2)

Identifier: R-HSA-6798269
Species: Homo sapiens
Compartment: nucleoplasm
Identifier: R-HSA-8964549
Species: Homo sapiens
Compartment: nucleoplasm

Complex (5 results from a total of 12)

Identifier: R-HSA-2127252
Species: Homo sapiens
Compartment: nucleoplasm
Identifier: R-HSA-1226088
Species: Homo sapiens
Compartment: nucleoplasm
Identifier: R-HSA-1363310
Species: Homo sapiens
Compartment: nucleoplasm
Identifier: R-HSA-6798265
Species: Homo sapiens
Compartment: nucleoplasm
Identifier: R-HSA-2127250
Species: Homo sapiens
Compartment: nucleoplasm

Pathway (5 results from a total of 6)

Identifier: R-HSA-1362300
Species: Homo sapiens
Compartment: nucleoplasm
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.
Identifier: R-HSA-1538133
Species: Homo sapiens
Compartment: nucleoplasm
In G0 and early G1 in quiescent cells, p130 (RBL2) bound to E2F4 or E2F5 and either DP1 or DP2, associates with the MuvB complex, forming an evolutionarily conserved DREAM complex, that represses transcription of cell cycle genes. During early G1 phase in actively cycling cells, p107 (RBL1) forms a complex with E2F4 and DP1 or DP2 and represses transcription of E2F target genes. Both p130 (RBL2) and p107 (RBL1) repress transcription of E2F targets through recruiting histone deacetylase HDAC1, possibly in complex with other chromatin modifying enzymes, to E2F-regulated promoters. Expression of p107 (RBL1) is cell cycle regulated, with its levels peaking in late G1 and S phase. Although p107 (RBL1) is phosphorylated by cyclin D assocaited kinases during late G1 phase, a small pool of p107 (RBL1) is thought to be present throughout G1 and S phase, and could be involved in fine tuning the transcription of S-phase genes. This is supported by studies showing that unlike RB1 and p130 (RBL2), which are able to induce G1 arrest when over-expressed, p107 (RBL1) over-expression can arrest the cell cycle in both G1 and S phase. For recent reviews on the function of p107, p130 and pocket proteins in general, please refer to Wirt and Sage, 2010, MacPherson 2008 and Cobrinik 2005.
Identifier: R-HSA-69231
Species: Homo sapiens
Three D-type cyclins are essential for progression from G1 to S-phase. These D cyclins bind to and activate both CDK4 and CDK6. The formation of all possible complexes between the D-type cyclins and CDK4/6 is promoted by the proteins, p21(CIP1/WAF1) and p27(KIP1). The cyclin-dependent kinases are then activated due to phosphorylation by CAK. The cyclin dependent kinases phosphorylate the RB1 protein and RB1-related proteins p107 (RBL1) and p130 (RBL2). Phosphorylation of RB1 leads to release of activating E2F transcription factors (E2F1, E2F2 and E2F3). After repressor E2Fs (E2F4 and E2F5) dissociate from phosphorylated RBL1 and RBL2, activating E2Fs bind to E2F promoter sites, stimulating transcription of cell cycle genes, which then results in proper G1/S transition. The binding and sequestration of p27Kip may also contribute to the activation of CDK2 cyclin E/CDK2 cyclin A complexes at the G1/S transition (Yew et al., 2001).
Identifier: R-HSA-453279
Species: Homo sapiens
Mitotic G1-G1/S phase involves G1 phase of the mitotic interphase and G1/S transition, when a cell commits to DNA replication and divison genetic and cellular material to two daughter cells.

During early G1, cells can enter a quiescent G0 state. In quiescent cells, the evolutionarily conserved DREAM complex, consisting of the pocket protein family member p130 (RBL2), bound to E2F4 or E2F5, and the MuvB complex, represses transcription of cell cycle genes (reviewed by Sadasivam and DeCaprio 2013).

During early G1 phase in actively cycling cells, transcription of cell cycle genes is repressed by another pocket protein family member, p107 (RBL1), which forms a complex with E2F4 (Ferreira et al. 1998, Cobrinik 2005). RB1 tumor suppressor, the product of the retinoblastoma susceptibility gene, is the third member of the pocket protein family. RB1 binds to E2F transcription factors E2F1, E2F2 and E2F3 and inhibits their transcriptional activity, resulting in prevention of G1/S transition (Chellappan et al. 1991, Bagchi et al. 1991, Chittenden et al. 1991, Lees et al. 1993, Hiebert 1993, Wu et al. 2001). Once RB1 is phosphorylated on serine residue S795 by Cyclin D:CDK4/6 complexes, it can no longer associate with and inhibit E2F1-3. Thus, CDK4/6-mediated phosphorylation of RB1 leads to transcriptional activation of E2F1-3 target genes needed for the S phase of the cell cycle (Connell-Crowley et al. 1997). CDK2, in complex with cyclin E, contributes to RB1 inactivation and also activates proteins needed for the initiation of DNA replication (Zhang 2007). Expression of D type cyclins is regulated by extracellular mitogens (Cheng et al. 1998, Depoortere et al. 1998). Catalytic activities of CDK4/6 and CDK2 are controlled by CDK inhibitors of the INK4 family (Serrano et al. 1993, Hannon and Beach 1994, Guan et al. 1994, Guan et al. 1996, Parry et al. 1995) and the Cip/Kip family, respectively.

Identifier: R-HSA-2173796
Species: Homo sapiens
After phosphorylated SMAD2 and/or SMAD3 form a heterotrimer with SMAD4, SMAD2/3:SMAD4 complex translocates to the nucleus (Xu et al. 2000, Kurisaki et al. 2001, Xiao et al. 2003). In the nucleus, linker regions of SMAD2 and SMAD3 within SMAD2/3:SMAD4 complex can be phosphorylated by CDK8 associated with cyclin C (CDK8:CCNC) or CDK9 associated with cyclin T (CDK9:CCNT). CDK8/CDK9-mediated phosphorylation of SMAD2/3 enhances transcriptional activity of SMAD2/3:SMAD4 complex, but also primes it for ubiquitination and consequent degradation (Alarcon et al. 2009).

The transfer of SMAD2/3:SMAD4 complex to the nucleus can be assisted by other proteins, such as WWTR1. In human embryonic cells, WWTR1 (TAZ) binds SMAD2/3:SMAD4 heterotrimer and mediates TGF-beta-dependent nuclear accumulation of SMAD2/3:SMAD4. The complex of WWTR1 and SMAD2/3:SMAD4 binds promoters of SMAD7 and SERPINE1 (PAI-1 i.e. plasminogen activator inhibitor 1) genes and stimulates their transcription (Varelas et al. 2008). Stimulation of SMAD7 transcription by SMAD2/3:SMAD4 represents a negative feedback loop in TGF-beta receptor signaling. SMAD7 can be downregulated by RNF111 ubiquitin ligase (Arkadia), which binds and ubiquitinates SMAD7, targeting it for degradation (Koinuma et al. 2003).

SMAD2/3:SMAD4 heterotrimer also binds the complex of RBL1 (p107), E2F4/5 and TFDP1/2 (DP1/2). The resulting complex binds MYC promoter and inhibits MYC transcription. Inhibition of MYC transcription contributes to anti-proliferative effect of TGF-beta (Chen et al. 2002). SMAD2/3:SMAD4 heterotrimer also associates with transcription factor SP1. SMAD2/3:SMAD4:SP1 complex stimulates transcription of a CDK inhibitor CDKN2B (p15-INK4B), also contributing to the anti-proliferative effect of TGF-beta (Feng et al. 2000).

MEN1 (menin), a transcription factor tumor suppressor mutated in a familial cancer syndrome multiple endocrine neoplasia type 1, forms a complex with SMAD2/3:SMAD4 heterotrimer, but transcriptional targets of SMAD2/3:SMAD4:MEN1 have not been elucidated (Kaji et al. 2001, Sowa et al. 2004, Canaff et al. 2012).

JUNB is also an established transcriptional target of SMAD2/3:SMAD4 complex (Wong et al. 1999).
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