Rb (S780) Blocking Peptide | RB1 blocking peptide

Phospho-Rb(S780) Antibody Blocking peptide

• Gene Names: RB1; RB; pRb; OSRC; pp110; p105-Rb; PPP1R130
• Synonyms: Rb (S780); Phospho-Rb(S780) Antibody Blocking peptide; Retinoblastoma-associated protein; p105-Rb; pRb; Rb; pp110; RB1; RB1 blocking peptide

• Specificity: The synthetic peptide sequence used to generate the antibody was selected from the region of human Phospho-Rb-S780. A 10 to 100 fold molar excess to antibody is recommended. Precise conditions should be optimized for a particular assay.
• Form/Format: The synthetic peptide was lyophilized with 100% acetonitrile and is supplied as a powder. Reconstitute with 0.1 ml deionized water for a final concentration of 1 mg/ml.
• Sequence Length: 928

• Cellular Location: Nucleus.
• Tissue Location: Expressed in the retina.
• Preparation and Storage: Maintain refrigerated at 2-8 degree C for up to 6 months. For long term storage store at -20 degree C.

Related Product Information for RB1 blocking peptide

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, SUV420H1 and SUV420H2, 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.

NCBI and Uniprot Product Information

• NCBI GI #: 132164
• NCBI GeneID: 5925
• UniProt Accession #: P06400; P78499; Q5VW46; Q8IZL4; A8K5E3
• Molecular Weight: 106,159 Da
• NCBI Official Full Name: Retinoblastoma-associated protein
• NCBI Official Synonym Full Names: RB transcriptional corepressor 1
• NCBI Official Symbol: RB1
• NCBI Official Synonym Symbols: RB; pRb; OSRC; pp110; p105-Rb; PPP1R130
• NCBI Protein Information: retinoblastoma-associated protein
• UniProt Protein Name: Retinoblastoma-associated protein
• Protein Family: Retinoblastoma-associated protein
• UniProt Gene Name: RB1
• UniProt Synonym Gene Names: Rb
• UniProt Entry Name: RB_HUMAN

NCBI Description

The protein encoded by this gene is a negative regulator of the cell cycle and was the first tumor suppressor gene found. The encoded protein also stabilizes constitutive heterochromatin to maintain the overall chromatin structure. The active, hypophosphorylated form of the protein binds transcription factor E2F1. Defects in this gene are a cause of childhood cancer retinoblastoma (RB), bladder cancer, and osteogenic sarcoma. [provided by RefSeq, Jul 2008]

Uniprot Description

Rb: retinoblastoma tumor suppressor protein regulates cell proliferation by controlling progression through the G1-phase restriction point. Has three distinct binding domains and interacts with regulatory proteins including the E2F family of transcription factors, c-Abl tyrosine kinase and proteins with a conserved LXCXE motif. Cell cycle-dependent phosphorylation by Cdks inhibits Rb target binding, thus allowing cell cycle progression. Recruits and targets histone methyltransferase suv39h1 leading to epigenetic transcriptional repression.

Protein type: Transcription, coactivator/corepressor; Oncoprotein; Tumor suppressor; Nuclear receptor co-regulator

Chromosomal Location of Human Ortholog: 13q14.2

Cellular Component: chromatin; nucleoplasm; nucleus; PML body; Rb-E2F complex; SWI/SNF complex; transcription elongation factor complex b

Molecular Function: DNA binding; identical protein binding; kinase binding; phosphoprotein binding; protein binding; transcription factor activity; transcription factor binding; ubiquitin protein ligase binding

Biological Process: cell cycle arrest; cell cycle checkpoint; chromatin remodeling; G1/S transition of mitotic cell cycle; G1/S-specific transcription in mitotic cell cycle; maintenance of mitotic sister chromatid cohesion; mitotic cell cycle checkpoint; myoblast differentiation; negative regulation of protein kinase activity; negative regulation of transcription factor activity; negative regulation of transcription from RNA polymerase II promoter, mitotic; negative regulation of transcription, DNA-dependent; positive regulation of mitotic metaphase/anaphase transition; Ras protein signal transduction; regulation of lipid kinase activity; regulation of mitotic cell cycle; sister chromatid biorientation

Disease: Bladder Cancer; Osteogenic Sarcoma; Retinoblastoma; Small Cell Cancer Of The Lung