4FKD

Identification of the Activator Binding Residues in the Second Cysteine-Rich Regulatory Domain of Protein Kinase C Theta


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.63 Å
  • R-Value Free: 0.204 
  • R-Value Work: 0.171 
  • R-Value Observed: 0.173 

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Literature

Identification of the Activator Binding Residues in the Second Cysteine-Rich Regulatory Domain of Protein Kinase C Theta.

Rahman, G.M.Shanker, S.Lewin, N.E.Kedei, N.Hill, C.S.Prasad, B.V.Blumberg, P.M.Das, J.

(2013) Biochem J 451: 33-44

  • DOI: 10.1042/BJ20121307
  • Primary Citation of Related Structures:  
    4FKD

  • PubMed Abstract: 
  • PKC (protein kinase C) θ is predominantly expressed in T-cells and is critically involved in immunity. Design of PKCθ-selective molecules to manage autoimmune disorders by targeting its activator-binding C1 domain requires the knowledge of its structure and the activator-binding residues ...

    PKC (protein kinase C) θ is predominantly expressed in T-cells and is critically involved in immunity. Design of PKCθ-selective molecules to manage autoimmune disorders by targeting its activator-binding C1 domain requires the knowledge of its structure and the activator-binding residues. The C1 domain consists of twin C1 domains, C1A and C1B, of which C1B plays a critical role in the membrane translocation and activation of PKCθ. In the present study we determined the crystal structure of PKCθC1B to 1.63 Å (1 Å=0.1 nm) resolution, which showed that Trp(253) at the rim of the activator-binding pocket was orientated towards the membrane, whereas in PKCδC1B the homologous tryptophan residue was orientated away from the membrane. This particular orientation of Trp(253) affects the size of the activator-binding pocket and the membrane affinity. To further probe the structural constraints on activator-binding, five residues lining the activator-binding site were mutated (Y239A, T243A, W253G, L255G and Q258G) and the binding affinities of the PKCθC1B mutants were measured. These mutants showed reduced binding affinities for phorbol ester [PDBu (phorbol 12,13-dibutyrate)] and diacylglycerol [DOG (sn-1,2-dioctanoylglycerol), SAG (sn-1-stearoyl 2-arachidonyl glycerol)]. All five full-length PKCθ mutants exhibited reduced phorbol-ester-induced membrane translocation compared with the wild-type. These results provide insights into the PKCθ activator-binding domain, which will aid in future design of PKCθ-selective molecules.


    Organizational Affiliation

    Department of Pharmacological & Pharmaceutical Sciences, College of Pharmacy, University of Houston, Houston, TX 77204, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Protein kinase C theta type A65Mus musculusMutation(s): 0 
Gene Names: PrkcqPkcq
EC: 2.7.11.13
Find proteins for Q02111 (Mus musculus)
Explore Q02111 
Go to UniProtKB:  Q02111
NIH Common Fund Data Resources
IMPC:  MGI:97601
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download Ideal Coordinates CCD File 
A
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.63 Å
  • R-Value Free: 0.204 
  • R-Value Work: 0.171 
  • R-Value Observed: 0.173 
  • Space Group: P 61
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 65.85α = 90
b = 65.85β = 90
c = 27.12γ = 120
Software Package:
Software NamePurpose
CrystalCleardata collection
PHASERphasing
PHENIXrefinement
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-01-23
    Type: Initial release
  • Version 1.1: 2013-06-19
    Changes: Database references