1ZP2

Structure of the Mediator subunit cyclin C


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Free: 0.288 
  • R-Value Work: 0.244 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structure of the Mediator Subunit Cyclin C and its Implications for CDK8 Function.

Hoeppner, S.Baumli, S.Cramer, P.

(2005) J.Mol.Biol. 350: 833-842

  • DOI: 10.1016/j.jmb.2005.05.041

  • PubMed Abstract: 
  • Cyclin C binds the cyclin-dependent kinases CDK8 and CDK3, which regulate mRNA transcription and the cell cycle, respectively. The crystal structure of cyclin C reveals two canonical five-helix repeats and a specific N-terminal helix. In contrast to ...

    Cyclin C binds the cyclin-dependent kinases CDK8 and CDK3, which regulate mRNA transcription and the cell cycle, respectively. The crystal structure of cyclin C reveals two canonical five-helix repeats and a specific N-terminal helix. In contrast to other cyclins, the N-terminal helix is short, mobile, and in an exposed position that allows for interactions with proteins other than the CDKs. A model of the CDK8/cyclin C pair reveals two regions in the interface with apparently distinct roles. A conserved region explains promiscuous binding of cyclin C to CDK8 and CDK3, and a non-conserved region may be responsible for discrimination of CDK8 against other CDKs involved in transcription. A conserved and cyclin C-specific surface groove may recruit substrates near the CDK8 active site. Activation of CDKs generally involves phosphorylation of a loop at a threonine residue. In CDK8, this loop is longer and the threonine is absent, suggesting an alternative mechanism of activation that we discuss based on a CDK8-cyclin C model.


    Organizational Affiliation

    Gene Center, University of Munich (LMU), Department of Chemistry and Biochemistry, Feodor-Lynen-Str. 25, 81377 Munich, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
RNA polymerase II holoenzyme cyclin-like subunit
A
235Schizosaccharomyces pombe (strain 972 / ATCC 24843)Mutation(s): 0 
Gene Names: srb11
Find proteins for O94503 (Schizosaccharomyces pombe (strain 972 / ATCC 24843))
Go to UniProtKB:  O94503
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Free: 0.288 
  • R-Value Work: 0.244 
  • Space Group: P 31 2 1
Unit Cell:
Length (Å)Angle (°)
a = 91.700α = 90.00
b = 91.700β = 90.00
c = 91.100γ = 120.00
Software Package:
Software NamePurpose
SOLVEphasing
CCP4data scaling
MOSFLMdata reduction
SCALAdata scaling
CNSrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2005-07-19
    Type: Initial release
  • Version 1.1: 2008-04-30
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Derived calculations, Version format compliance