Specificityab10921 recognises human and mouse Rb protein only when it has been phosphorylated at the S608 residue. The antibody does not recognise non-phosphorylated Rb or Rb phosphorylated at other sites.
Phosphorylation of the Rb protein at S608 is dependant upon CDK4.
FunctionKey regulator of entry into cell division that acts as a tumor suppressor. Promotes G0-G1 transition when phosphorylated by CDK3/cyclin-C. Acts as a transcription repressor of E2F1 target genes. The underphosphorylated, active form of RB1 interacts with E2F1 and represses its transcription activity, leading to cell cycle arrest. Directly involved in heterochromatin formation by maintaining overall chromatin structure and, in particular, that of constitutive heterochromatin by stabilizing histone methylation. Recruits and targets histone methyltransferases SUV39H1, KMT5B and KMT5C, leading to epigenetic transcriptional repression. Controls histone H4 'Lys-20' trimethylation. Inhibits the intrinsic kinase activity of TAF1. Mediates transcriptional repression by SMARCA4/BRG1 by recruiting a histone deacetylase (HDAC) complex to the c-FOS promoter. In resting neurons, transcription of the c-FOS promoter is inhibited by BRG1-dependent recruitment of a phospho-RB1-HDAC1 repressor complex. Upon calcium influx, RB1 is dephosphorylated by calcineurin, which leads to release of the repressor complex (By similarity). In case of viral infections, interactions with SV40 large T antigen, HPV E7 protein or adenovirus E1A protein induce the disassembly of RB1-E2F1 complex thereby disrupting RB1's activity.
Tissue specificityExpressed in the retina.
Involvement in diseaseChildhood cancer retinoblastoma Bladder cancer Osteogenic sarcoma
Sequence similaritiesBelongs to the retinoblastoma protein (RB) family.
DomainThe Pocket domain binds to the threonine-phosphorylated domain C, thereby preventing interaction with heterodimeric E2F/DP transcription factor complexes.
Post-translational modificationsPhosphorylated by CDK6 and CDK4, and subsequently by CDK2 at Ser-567 in G1, thereby releasing E2F1 which is then able to activate cell growth. Dephosphorylated at the late M phase. SV40 large T antigen, HPV E7 and adenovirus E1A bind to the underphosphorylated, active form of pRb. Phosphorylation at Thr-821 and Thr-826 promotes interaction between the C-terminal domain C and the Pocket domain, and thereby inhibits interactions with heterodimeric E2F/DP transcription factor complexes. Dephosphorylated at Ser-795 by calcineruin upon calcium stimulation. CDK3/cyclin-C-mediated phosphorylation at Ser-807 and Ser-811 is required for G0-G1 transition. Phosphorylated by CDK1 and CDK2 upon TGFB1-mediated apoptosis. N-terminus is methylated by METTL11A/NTM1 (By similarity). Monomethylation at Lys-810 by SMYD2 enhances phosphorylation at Ser-807 and Ser-811, and promotes cell cycle progression. Monomethylation at Lys-860 by SMYD2 promotes interaction with L3MBTL1. Acetylation at Lys-873 and Lys-874 regulates subcellular localization, at least during keratinocytes differentiation.
Protein phosphatase 1 regulatory subunit 130 antibody
RB transcriptional corepressor 1 antibody
RB1 gene antibody
Retinoblastoma 1 antibody
Retinoblastoma suspectibility protein antibody
Retinoblastoma-associated protein antibody
Anti-Rb (phospho S608) antibody [51B7] images
Immunocytochemistry/ Immunofluorescence - Rb (phospho S608) antibody [51B7] (ab10921)Image courtesy of an Abreview submitted by Dr. Kirk McManus, University of Manitoba/MICB, Canada
ab10921 (1/200) staining Rb phospho S608 in Human HeLa cells (green). Cells were fixed in paraformaldehyde, permeabilised using 0.5% Triton X-100/PBS and counterstained with DAPI in order to highlight the nucleus (red). For further experimental details please refer to Abreview.
References for Anti-Rb (phospho S608) antibody [51B7] (ab10921)
This product has been referenced in:
Silva AR et al. Repair of oxidative DNA damage, cell-cycle regulation and neuronal death may influence the clinical manifestation of Alzheimer's disease. PLoS One9:e99897 (2014).
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