Overview

  • Product name
  • Description
    Rabbit polyclonal to Rb
  • Host species
    Rabbit
  • Tested applications
    Suitable for: WB, ICC/IF, IP, IHC-Pmore details
  • Species reactivity
    Reacts with: Human
    Predicted to work with: Mouse, Rat, Cow, Pig, Rhesus monkey
  • Immunogen

    Recombinant fragment within Human Rb (C terminal). The exact sequence is proprietary.
    Database link: P06400

  • Positive control
    • WB: A431 cell lysate. ICC/IF: MCF7 cells. IHC: Human colon carcinoma tissue. IP: HeLa whole cell lysate (ab150035).

Properties

Applications

Our Abpromise guarantee covers the use of ab226979 in the following tested applications.

The application notes include recommended starting dilutions; optimal dilutions/concentrations should be determined by the end user.

Application Abreviews Notes
WB 1/500 - 1/3000. Predicted molecular weight: 106 kDa.
ICC/IF 1/100 - 1/1000.
IP 1/100 - 1/500.
IHC-P 1/100 - 1/1000.

Target

  • Function
    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.
  • Tissue specificity
    Expressed in the retina.
  • Involvement in disease
    Childhood cancer retinoblastoma
    Bladder cancer
    Osteogenic sarcoma
  • Sequence similarities
    Belongs to the retinoblastoma protein (RB) family.
  • Domain
    The Pocket domain binds to the threonine-phosphorylated domain C, thereby preventing interaction with heterodimeric E2F/DP transcription factor complexes.
  • Post-translational
    modifications
    Phosphorylated 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.
  • Cellular localization
    Nucleus.
  • Information by UniProt
  • Database links
  • Alternative names
    • Exon 17 tumor GOS561 substitution mutation causes premature stop antibody
    • GOS563 exon 17 substitution mutation causes premature stop antibody
    • OSRC antibody
    • Osteosarcoma antibody
    • p105-Rb antibody
    • P105RB antibody
    • PP105 antibody
    • pp110 antibody
    • PPP1R130 antibody
    • pRb antibody
    • Prepro retinoblastoma associated protein antibody
    • Protein phosphatase 1 regulatory subunit 130 antibody
    • Rb antibody
    • RB transcriptional corepressor 1 antibody
    • RB_HUMAN antibody
    • RB1 antibody
    • RB1 gene antibody
    • Retinoblastoma 1 antibody
    • Retinoblastoma suspectibility protein antibody
    • Retinoblastoma-associated protein antibody
    see all

Images

  • Anti-Rb antibody (ab226979) at 1/500 dilution + A431 (human epidermoid carcinoma cell line) whole cell lysate at 30 µg

    Secondary
    HRP-conjugated anti-rabbit IgG

    Predicted band size: 106 kDa



    5% SDS-PAGE gel.

  • Rb was immunoprecipitated from HeLa (human epithelial cell line from cervix adenocarcinoma) whole cell lysate with 4 μg of ab226979. Western blot was performed from the immunoprecipitate using ab226979 at 1/500 dilution.

    Lane 1: Rabbit IgG instead of ab226979 in HeLa whole cell lysate. 

    Lane 2: ab226979 IP in HeLa whole cell lysate.

  • Paraffin-embedded human colon carcinoma tissue stained for Rb using ab226979 at 1/500 dilution in immunohistochemical analysis.

  • 4% paraformaldehyde-fixed MCF7 (human breast adenocarcinoma cell line) cells stained for Rb using ab226979 at 1/500 dilution in ICC/IF. Nuclear Counterstain: Hoechst 33342 (blue).

References

This product has been referenced in:
  • Luo Y  et al. ß-catenin nuclear translocation induced by HIF-1a overexpression leads to the radioresistance of prostate cancer. Int J Oncol 52:1827-1840 (2018). Read more (PubMed: 29658569) »
See 1 Publication for this product

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