Crystal structure of the inactive retinoblastoma protein phosphorylated at T373

Experimental Data Snapshot

  • Resolution: 2.70 Å
  • R-Value Free: 0.266 
  • R-Value Work: 0.212 
  • R-Value Observed: 0.216 

wwPDB Validation   3D Report Full Report

This is version 1.2 of the entry. See complete history


Structures of inactive retinoblastoma protein reveal multiple mechanisms for cell cycle control.

Burke, J.R.Hura, G.L.Rubin, S.M.

(2012) Genes Dev 26: 1156-1166

  • DOI: https://doi.org/10.1101/gad.189837.112
  • Primary Citation of Related Structures:  
    4ELJ, 4ELL

  • PubMed Abstract: 

    Cyclin-dependent kinase (Cdk) phosphorylation of the Retinoblastoma protein (Rb) drives cell proliferation through inhibition of Rb complexes with E2F transcription factors and other regulatory proteins. We present the first structures of phosphorylated Rb that reveal the mechanism of its inactivation. S608 phosphorylation orders a flexible "pocket" domain loop such that it mimics and directly blocks E2F transactivation domain (E2F(TD)) binding. T373 phosphorylation induces a global conformational change that associates the pocket and N-terminal domains (RbN). This first multidomain Rb structure demonstrates a novel role for RbN in allosterically inhibiting the E2F(TD)-pocket association and protein binding to the pocket "LxCxE" site. Together, these structures detail the regulatory mechanism for a canonical growth-repressive complex and provide a novel example of how multisite Cdk phosphorylation induces diverse structural changes to influence cell cycle signaling.

  • Organizational Affiliation

    Department of Chemistry and Biochemistry, University of California at Santa Cruz, Santa Cruz, California 95064, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Retinoblastoma-associated protein656Homo sapiensMutation(s): 0 
Gene Names: RB1
UniProt & NIH Common Fund Data Resources
Find proteins for P06400 (Homo sapiens)
Explore P06400 
Go to UniProtKB:  P06400
PHAROS:  P06400
GTEx:  ENSG00000139687 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP06400
Sequence Annotations
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on TPO
Experimental Data & Validation

Experimental Data

  • Resolution: 2.70 Å
  • R-Value Free: 0.266 
  • R-Value Work: 0.212 
  • R-Value Observed: 0.216 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 51.62α = 90
b = 129.51β = 90
c = 135.04γ = 90
Software Package:
Software NamePurpose
JBluIce-EPICSdata collection
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-05-23
    Type: Initial release
  • Version 1.1: 2012-08-15
    Changes: Database references
  • Version 1.2: 2017-08-23
    Changes: Refinement description, Source and taxonomy