4UN0

Crystal structure of the human CDK12-cyclinK complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.15 Å
  • R-Value Free: 0.271 
  • R-Value Work: 0.215 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structures of the Cdk12/Cyck Complex with AMP-Pnp Reveal a Flexible C-Terminal Kinase Extension Important for ATP Binding.

Dixon-Clarke, S.E.Elkins, J.M.Cheng, S.G.Morin, G.B.Bullock, A.N.

(2015) Sci.Rep. 5: 17122

  • DOI: 10.1038/srep17122
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Cyclin-dependent kinase 12 (CDK12) promotes transcriptional elongation by phosphorylation of the RNA polymerase II C-terminal domain (CTD). Structure-function studies show that this activity is dependent on a C-terminal kinase extension, as well as t ...

    Cyclin-dependent kinase 12 (CDK12) promotes transcriptional elongation by phosphorylation of the RNA polymerase II C-terminal domain (CTD). Structure-function studies show that this activity is dependent on a C-terminal kinase extension, as well as the binding of cyclin K (CycK). To better define these interactions we determined the crystal structure of the human CDK12/CycK complex with and without the kinase extension in the presence of AMP-PNP. The structures revealed novel features for a CDK, including a large β4-β5 loop insertion that contributes to the N-lobe interaction with the cyclin. We also observed two different conformations of the C-terminal kinase extension that effectively open and close the ATP pocket. Most notably, bound AMP-PNP was only observed when trapped in the closed state. Truncation of this C-terminal structure also diminished AMP-PNP binding, as well as the catalytic activity of the CDK12/CycK complex. Further kinetic measurements showed that the full length CDK12/CycK complex was significantly more active than the two crystallised constructs suggesting a critical role for additional domains. Overall, these results demonstrate the intrinsic flexibility of the C-terminal extension in CDK12 and highlight its importance for both ATP binding and kinase activity.


    Organizational Affiliation

    Structural Genomics Consortium, University of Oxford, Old Road Campus, Roosevelt Drive, Oxford OX3 7DQ, UK.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
CYCLIN-K
A, B
259Homo sapiensMutation(s): 0 
Gene Names: CCNK (CPR4)
Find proteins for O75909 (Homo sapiens)
Go to Gene View: CCNK
Go to UniProtKB:  O75909
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
CYCLIN-DEPENDENT KINASE 12
C, D
326Homo sapiensMutation(s): 0 
Gene Names: CDK12 (CRK7, CRKRS, KIAA0904)
EC: 2.7.11.22, 2.7.11.23
Find proteins for Q9NYV4 (Homo sapiens)
Go to Gene View: CDK12
Go to UniProtKB:  Q9NYV4
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
TPO
Query on TPO
C, D
L-PEPTIDE LINKINGC4 H10 N O6 PTHR
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.15 Å
  • R-Value Free: 0.271 
  • R-Value Work: 0.215 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 49.580α = 90.00
b = 148.780β = 94.22
c = 92.150γ = 90.00
Software Package:
Software NamePurpose
Aimlessdata scaling
PHASERphasing
xia2data reduction
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Revision History 

  • Version 1.0: 2014-06-04
    Type: Initial release
  • Version 1.1: 2015-12-09
    Type: Database references