1KXU

CYCLIN H, A POSITIVE REGULATORY SUBUNIT OF CDK ACTIVATING KINASE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.295 
  • R-Value Work: 0.214 
  • R-Value Observed: 0.214 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Three-dimensional structure of human cyclin H, a positive regulator of the CDK-activating kinase.

Kim, K.K.Chamberlin, H.M.Morgan, D.O.Kim, S.H.

(1996) Nat Struct Biol 3: 849-855

  • DOI: 10.1038/nsb1096-849
  • Primary Citation of Related Structures:  
    1KXU

  • PubMed Abstract: 
  • Cyclin-dependent kinases (CDKs), which play a key role in cell cycle control, are activated by the CDK activating kinase (CAK), which activates cyclin-bound CDKs by phosphorylation at a specific threonine residue. Vertebrate CAK contains two key componen ...

    Cyclin-dependent kinases (CDKs), which play a key role in cell cycle control, are activated by the CDK activating kinase (CAK), which activates cyclin-bound CDKs by phosphorylation at a specific threonine residue. Vertebrate CAK contains two key components: a kinase subunit with homology to its substrate CDKs and a regulatory subunit with homology to cyclins. We have determined the X-ray crystal structure of the regulatory subunit of CAK, cyclin H, at 2.6 A resolution. Cyclin H contains two alpha-helical core domains with a fold similar to that of cyclin A, a regulatory subunit of CAK substrate CDK2, and of TFIIB, a transcription factor. Outside of the core domains, the N- and C-terminal regions of the three structures are completely different. The conformational differences between cyclin H and A structures may reflect functional differences between the two cyclins.


    Related Citations: 
    • A Novel Cyclin Associates with Mo15/Cdk7 to Form the Cdk-Activating Kinase
      Fisher, R.P., Morgan, D.O.
      (1994) Cell 78: 713

    Organizational Affiliation

    Department of Chemistry, University of California, Berkeley 94720, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
CYCLIN H A333Homo sapiensMutation(s): 0 
Gene Names: CCNH
Find proteins for P51946 (Homo sapiens)
Explore P51946 
Go to UniProtKB:  P51946
NIH Common Fund Data Resources
PHAROS:  P51946
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.295 
  • R-Value Work: 0.214 
  • R-Value Observed: 0.214 
  • Space Group: I 41 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 84.08α = 90
b = 84.08β = 90
c = 374.88γ = 90
Software Package:
Software NamePurpose
X-PLORmodel building
X-PLORrefinement
DENZOdata reduction
SCALEPACKdata scaling
X-PLORphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1997-01-27
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2011-11-16
    Changes: Atomic model