Anti-RbAp48 [Clone 11G10]

GST fusion protein corresponding to aa 1-425 of human RbAp48.

PBS, pH 7.4.

Liquid

Purified by Protein G affinity chromatography

This antibody is stable at -20°C for at least one (1) year; store in appropriate aliquots to avoid multiple freeze-thaw cycles.

Research Use Only

Next Day 2-8°C

This antibody recognizes human and mouse RbAp48.

RbAp48, product of the RBBP4 gene in humans, is a 48 kDa nuclear protein that was first identified through its interaction with the carboxyl-terminus of retinoblastoma protein (Rb). In mice, the RbAp48 protein is a key component in histone acetylation, transcriptional regulation and in the cyclic adenosine monophosphate (cAMP)-protein kinase element-binding protein CREB1 path way. Since histone acetylation and the cAMP-PKA-CREB1 pathway are extremely important for normal hippocampal function, RbAp48 has been investigated to test whether decreased expression of RbAp48 in aged animals is directly associated with age-related memory loss.

Tumor suppressor that is a key regulator of the G1/S transition of the cell cycle (PubMed:10499802). The hypophosphorylated form binds transcription regulators of the E2F family, preventing transcription of E2F-responsive genes (PubMed:10499802). Both physically blocks E2Fs transactivating domain and recruits chromatin-modifying enzymes that actively repress transcription (PubMed:10499802). Cyclin and CDK-dependent phosphorylation of RB1 induces its dissociation from E2Fs, thereby activating transcription of E2F responsive genes and triggering entry into S phase (PubMed:10499802). RB1 also promotes the G0-G1 transition upon phosphorylation and activation by CDK3/cyclin-C (PubMed:15084261). 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). {UniProtKB:P13405, UniProtKB:P33568, PubMed:10499802, PubMed:15084261}.; (Microbial infection) 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. {PubMed:1316611, PubMed:17974914, PubMed:18701596, PubMed:2839300, PubMed:8892909}.