Retinoblastoma (RB) is an embryonic malignant neoplasm of retinal origin. It almost always presents in early childhood and is often bilateral. Spontaneous regression ('cure') occurs in some cases.Lee W.-H., Nature 329:642-645(1987).Lee W.-H., Science 235:1394-1399(1987).Friend S.H., Proc. Natl. Acad. Sci. U.S.A. 84:9059-9063(1987).
Host
Rabbit
Immunogen
Peptide sequence around phosphorylation site of Serine 608(Y-L-S(p)-P-V) derived from Human Retinoblastoma.
Involvement In Disease
Childhood cancer retinoblastoma (RB); Bladder cancer (BLC); Osteogenic sarcoma (OSRC)
Raised In
Rabbit
Reactivity
Human, Mouse
Regulatory
RUO
Relevance
Retinoblastoma (RB) is an embryonic malignant neoplasm of retinal origin. It almost always presents in early childhood and is often bilateral. Spontaneous regression ('cure') occurs in some cases.
Lee W.-H., Nature 329:642-645(1987). Lee W.-H., Science 235:1394-1399(1987). Friend S.H., Proc. Natl. Acad. Sci. U.S.A. 84:9059-9063(1987).
Species
Homo Sapiens (Human)
Specificity
The antibody detects endogenous levels of Retinoblastoma only when phosphorylated at serine 608.
Key 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.
Pathway
Cell cycle Cellular senescence
Protein Families
Retinoblastoma protein (RB) family
Tissue Specificity
Expressed in the retina.
Buffer
Rabbit IgG in phosphate buffered saline (without Mg2+ and Ca2+), pH 7.4, 150mM NaCl, 0.02% sodium azide and 50% glycerol.
Form
Rabbit IgG in phosphate buffered saline (without Mg2+ and Ca2+), pH 7.4, 150mM NaCl, 0.02% sodium azide and 50% glycerol.
Format
liquid
Purification
Antibodies were produced by immunizing rabbits with synthetic phosphopeptide and KLH conjugates. Antibodies were purified by affinity-chromatography using epitope-specific phosphopeptide. Non-phospho specific antibodies were removed by chromatogramphy usi
Purity
Antibodies were produced by immunizing rabbits with synthetic phosphopeptide and KLH conjugates. Antibodies were purified by affinity-chromatography using epitope-specific phosphopeptide. Non-phospho specific antibodies were removed by chromatogramphy using non-phosphopeptide.
Storage
Upon receipt, store at -20°C or -80°C. Avoid repeated freeze.