Retinoblastoma K860 Me1 Antibody

RB1 (RB Transcriptional Corepressor 1) is a protein coding gene. The protein encoded by this gene is a negative regulator of the cell cycle and was the first tumor suppressor gene found. Promotes G0-G1 transition when phosphorylated by CDK3/cyclin-C. Acts as a transcription repressor of E2F1 target genes. The active, hypo-phosphorylated form of RB1 interacts with E2F1 and represses its transcription activity, leading to cell cycle arrest. RB1 is directly involved in heterochromatin formation by maintaining overall chromatin structure and the constitutive heterochromatin, by stabilizing histone methylation. Retinoblastoma recruits and targets histone methyltransferases SUV39H1, KMT5B and KMT5C, leading to epigenetic transcriptional repression. It controls histone H4 Lys-20 trimethylation and inhibits the intrinsic kinase activity of TAF1. It 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 RB1s activity. RB1 may be associated with diseases such as retinoblastoma, small cell cancer of the lung, bladder cancer, and osteogenic sarcoma. Anti-Retinoblastoma K860 Me1 Antibody is useful for researchers interested in cancer, transcription factor, epigenetics, and enzyme antibody research.