1KXU

CYCLIN H, A POSITIVE REGULATORY SUBUNIT OF CDK ACTIVATING KINASE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.295 
  • R-Value Work: 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.Mol.Biol. 3: 849-855


  • 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 comp ...

    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: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
CYCLIN H
A
333Homo sapiensGene Names: CCNH
Find proteins for P51946 (Homo sapiens)
Go to Gene View: CCNH
Go to UniProtKB:  P51946
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.295 
  • R-Value Work: 0.214 
  • Space Group: I 41 2 2
Unit Cell:
Length (Å)Angle (°)
a = 84.080α = 90.00
b = 84.080β = 90.00
c = 374.880γ = 90.00
Software Package:
Software NamePurpose
X-PLORrefinement
DENZOdata reduction
X-PLORphasing
SCALEPACKdata scaling
X-PLORmodel building

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

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