1BI7

MECHANISM OF G1 CYCLIN DEPENDENT KINASE INHIBITION FROM THE STRUCTURE OF THE CDK6-P16INK4A TUMOR SUPPRESSOR COMPLEX

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.40 Å
  • R-Value Free: 0.330 
  • R-Value Work: 0.227 
  • R-Value Observed: 0.227 

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This is version 1.2 of the entry. See complete history. 


Literature

Structural basis for inhibition of the cyclin-dependent kinase Cdk6 by the tumour suppressor p16INK4a.

Russo, A.A., Tong, L., Lee, J.O., Jeffrey, P.D., Pavletich, N.P.

(1998) Nature 395: 237-243

  • DOI: 10.1038/26155
  • Primary Citation of Related Structures:  
    1BI7, 1BI8

  • PubMed Abstract: 

    • The cyclin-dependent kinases 4 and 6 (Cdk4/6) that control the G1 phase of the cell cycle and their inhibitor, the p16INK4a tumour suppressor, have a central role in cell proliferation and in tumorigenesis. The structures of Cdk6 bound to p16INK4a an ...

    The cyclin-dependent kinases 4 and 6 (Cdk4/6) that control the G1 phase of the cell cycle and their inhibitor, the p16INK4a tumour suppressor, have a central role in cell proliferation and in tumorigenesis. The structures of Cdk6 bound to p16INK4a and to the related p19INK4d reveal that the INK4 inhibitors bind next to the ATP-binding site of the catalytic cleft, opposite where the activating cyclin subunit binds. They prevent cyclin binding indirectly by causing structural changes that propagate to the cyclin-binding site. The INK4 inhibitors also distort the kinase catalytic cleft and interfere with ATP binding, which explains how they can inhibit the preassembled Cdk4/6-cyclin D complexes as well. Tumour-derived mutations in INK4a and Cdk4 map to interface contacts, solidifying the role of CDK binding and inhibition in the tumour suppressor activity of p16INK4a.

    Organizational Affiliation: 

    Cellular Biochemistry and Biophysics Program, Memorial Sloan-Kettering Cancer Center, New York, New York 10021, USA.



Macromolecules
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(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
CYCLIN-DEPENDENT KINASE 6A326Homo sapiensMutation(s): 0 
Gene Names: CDK6, CDKN6
EC: 2.7.1 (PDB Primary Data), 2.7.11.22 (UniProt)
Find proteins for Q00534 (Homo sapiens)
Explore Q00534 
Go to UniProtKB:  Q00534
NIH Common Fund Data Resources
PHAROS  Q00534
GTEx  ENSG00000105810
Protein Feature View
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  • Reference Sequence
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(by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
MULTIPLE TUMOR SUPPRESSORB156Homo sapiensMutation(s): 0 
Gene Names: CDKN2A, CDKN2, MTS1
Find proteins for P42771 (Homo sapiens)
Explore P42771 
Go to UniProtKB:  P42771
NIH Common Fund Data Resources
PHAROS  P42771
GTEx  ENSG00000147889
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.40 Å
  • R-Value Free: 0.330 
  • R-Value Work: 0.227 
  • R-Value Observed: 0.227 
  • Space Group: P 41 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 123.1α = 90
b = 123.1β = 90
c = 112.5γ = 90
Software Package:
Software NamePurpose
X-PLORmodel building
X-PLORrefinement
DENZOdata reduction
SCALEPACKdata scaling
X-PLORphasing

Structure Validation

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View more in-depth experimental data

Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1999-01-13
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance