1O9K

Crystal structure of the retinoblastoma tumour suppressor protein bound to E2F peptide

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.285 
  • R-Value Work: 0.229 
  • R-Value Observed: 0.232 

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Literature

Crystal Structure of the Retinoblastoma Tumor Suppressor Protein Bound to E2F and the Molecular Basis of its Regulation

Xiao, B., Spencer, J., Clements, A., Ali-Khan, N., Mittnacht, S., Broceno, C., Burghammer, M., Perrakis, A., Marmorstein, R., Gamblin, S.J.

(2003) Proc Natl Acad Sci U S A 100: 2363

  • DOI: 10.1073/pnas.0436813100
  • Primary Citation of Related Structures:  
    1O9K

  • PubMed Abstract: 

    • The retinoblastoma tumor suppressor protein (pRb) regulates the cell cycle, facilitates differentiation, and restrains apoptosis. Furthermore, dysfunctional pRb is thought to be involved in the development of most human malignancies. Many of the functions of pRb are mediated by its regulation of the E2F transcription factors ...

    The retinoblastoma tumor suppressor protein (pRb) regulates the cell cycle, facilitates differentiation, and restrains apoptosis. Furthermore, dysfunctional pRb is thought to be involved in the development of most human malignancies. Many of the functions of pRb are mediated by its regulation of the E2F transcription factors. To understand the structural basis for this regulation, we have determined the crystal structure of a fragment of E2F in complex with the pocket domain of the tumor suppressor protein. The pRb pocket, comprising the A and B cyclin-like domains, is the major focus of tumourigenic mutations in the protein. The fragment of E2F used in our structural studies, residues 409-426 of E2F-1, represents the core of the pRb-binding region of the transcription factor. The structure shows that E2F binds at the interface of the A and B domains of the pocket making extensive interactions with conserved residues from both. We show by solution studies that a second site, probably contained within the "marked box" region of E2F, is responsible for additional interactions with the pRb pocket but is insufficient for complex formation on its own. In addition, we show that the interaction of the core binding fragment of E2F with pRb is inhibited by phosphorylation of the tumor suppressor protein by CDK2cyclin DE. Finally, our data reveal that the tight binding of the human papillomavirus E7 oncoprotein to pRb prevents subsequent interactions with the marked box region of E2F but not with its core binding region.

    Organizational Affiliation: 

    Division of Protein Structure, National Institute for Medical Research, Mill Hill, London NW7 1AA, United Kingdom.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
RETINOBLASTOMA-ASSOCIATED PROTEINA, C, E, G218Homo sapiensMutation(s): 0 
Gene Names: RB1
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PHAROS:  P06400
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UniProt GroupP06400
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
RETINOBLASTOMA-ASSOCIATED PROTEINB, D, F, H152Homo sapiensMutation(s): 0 
Gene Names: RB1
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
TRANSCRIPTION FACTOR E2F1I [auth P],
J [auth Q],
K [auth R],
L [auth S]		18Homo sapiensMutation(s): 0 
Gene Names: E2F1, RBBP3
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Find proteins for Q01094 (Homo sapiens)
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Go to UniProtKB:  Q01094
PHAROS:  Q01094
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UniProt GroupQ01094
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Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.285 
  • R-Value Work: 0.229 
  • R-Value Observed: 0.232 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 101.996α = 90
b = 158.548β = 93.7
c = 110.617γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
DENZOdata reduction
SCALEPACKdata scaling
AMoREphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2003-03-06
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Version format compliance