1DSY

C2 DOMAIN FROM PROTEIN KINASE C (ALPHA) COMPLEXED WITH CA2+ AND PHOSPHATIDYLSERINE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.195 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Ca(2+) bridges the C2 membrane-binding domain of protein kinase Calpha directly to phosphatidylserine.

Verdaguer, N.Corbalan-Garcia, S.Ochoa, W.F.Fita, I.Gomez-Fernandez, J.C.

(1999) EMBO J. 18: 6329-6338

  • DOI: 10.1093/emboj/18.22.6329

  • PubMed Abstract: 
  • The C2 domain acts as a membrane-targeting module in a diverse group of proteins including classical protein kinase Cs (PKCs), where it plays an essential role in activation via calcium-dependent interactions with phosphatidylserine. The three-dimens ...

    The C2 domain acts as a membrane-targeting module in a diverse group of proteins including classical protein kinase Cs (PKCs), where it plays an essential role in activation via calcium-dependent interactions with phosphatidylserine. The three-dimensional structures of the Ca(2+)-bound forms of the PKCalpha-C2 domain both in the absence and presence of 1, 2-dicaproyl-sn-phosphatidyl-L-serine have now been determined by X-ray crystallography at 2.4 and 2.6 A resolution, respectively. In the structure of the C2 ternary complex, the glycerophosphoserine moiety of the phospholipid adopts a quasi-cyclic conformation, with the phosphoryl group directly coordinated to one of the Ca(2+) ions. Specific recognition of the phosphatidylserine is reinforced by additional hydrogen bonds and hydrophobic interactions with protein residues in the vicinity of the Ca(2+) binding region. The central feature of the PKCalpha-C2 domain structure is an eight-stranded, anti-parallel beta-barrel with a molecular topology and organization of the Ca(2+) binding region closely related to that found in PKCbeta-C2, although only two Ca(2+) ions have been located bound to the PKCalpha-C2 domain. The structural information provided by these results suggests a membrane binding mechanism of the PKCalpha-C2 domain in which calcium ions directly mediate the phosphatidylserine recognition while the calcium binding region 3 might penetrate into the phospholipid bilayer.


    Organizational Affiliation

    IBMB-CSIC, Jordi Girona Salgado 18,26, E-08034 Barcelona.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PROTEIN KINASE C, ALPHA TYPE
A
139Rattus norvegicusGene Names: Prkca (Pkca)
EC: 2.7.11.13
Find proteins for P05696 (Rattus norvegicus)
Go to UniProtKB:  P05696
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PO4
Query on PO4

Download SDF File 
Download CCD File 
A
PHOSPHATE ION
O4 P
NBIIXXVUZAFLBC-UHFFFAOYSA-K
 Ligand Interaction
PSF
Query on PSF

Download SDF File 
Download CCD File 
A
1,2-DICAPROYL-SN-PHOSPHATIDYL-L-SERINE
PHOSPHATIDYLSERINE
C18 H34 N O10 P
MIQYPPGTNIFAPO-CABCVRRESA-N
 Ligand Interaction
CA
Query on CA

Download SDF File 
Download CCD File 
A
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.195 
  • Space Group: P 32 2 1
Unit Cell:
Length (Å)Angle (°)
a = 58.800α = 90.00
b = 58.800β = 90.00
c = 91.700γ = 120.00
Software Package:
Software NamePurpose
AMoREphasing
SCALEPACKdata scaling
CNSrefinement
DENZOdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2000-01-26
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance