Recombinant Human Rb protein (ab73767)



  • NatureRecombinant
  • SourceEscherichia coli
  • Amino Acid Sequence
    • SpeciesHuman
    • Molecular weight17 kDa
    • Amino acids792 to 928


Our Abpromise guarantee covers the use of ab73767 in the following tested applications.

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

  • Applications


  • Purity> 95 % SDS-PAGE.
    ab73767 is purified by proprietary chromatographic techniques. Purity is greater than 95.0% as determined by RP-HPLC and SDS-PAGE.
  • FormLyophilised
  • Concentration information loading...

Preparation and Storage

  • Stability and Storage

    Shipped at 4°C. Upon delivery aliquot. Store at -20°C or -80°C. Avoid freeze / thaw cycle.

    Preservative: None
    Constituents: 20mM PBS, pH 7.4

  • ReconstitutionReconstitute in sterile 18MO-cm H2O not less than 100 µg/ml, which can then be further diluted to other aqueous solutions.

General Info

  • Alternative names
    • OSRC
    • Osteosarcoma
    • p105-Rb
    • P105RB
    • PP105
    • pp110
    • PPP1R130
    • pRb
    • Prepro retinoblastoma associated protein
    • Protein phosphatase 1 regulatory subunit 130
    • Rb
    • RB_HUMAN
    • RB1
    • RB1 gene
    • Retinoblastoma 1
    • Retinoblastoma suspectibility protein
    • Retinoblastoma-associated protein
    see all
  • FunctionKey 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 specificityExpressed in the retina.
  • Involvement in diseaseChildhood cancer retinoblastoma
    Bladder cancer
    Osteogenic sarcoma
  • Sequence similaritiesBelongs to the retinoblastoma protein (RB) family.
  • DomainThe Pocket domain binds to the threonine-phosphorylated domain C, thereby preventing interaction with heterodimeric E2F/DP transcription factor complexes.
  • Post-translational
    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 localizationNucleus.
  • Information by UniProt

References for Recombinant Human Rb protein (ab73767)

ab73767 has not yet been referenced specifically in any publications.

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The protein was expressed in E. coli as a soluble protein. Then, purified by affinity chromatography. Unfortunately, we have never performed a CDK4 kinase experiment using the protein nor do we know if there have ...

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