3GPE

Crystal Structure Analysis of PKC (alpha)-C2 domain complexed with Ca2+ and PtdIns(4,5)P2


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.277 
  • R-Value Work: 0.243 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structural and mechanistic insights into the association of PKCalpha-C2 domain to PtdIns(4,5)P2.

Guerrero-Valero, M.Ferrer-Orta, C.Querol-Audi, J.Marin-Vicente, C.Fita, I.Gomez-Fernandez, J.C.Verdaguer, N.Corbalan-Garcia, S.

(2009) Proc.Natl.Acad.Sci.USA 106: 6603-6607

  • DOI: 10.1073/pnas.0813099106

  • PubMed Abstract: 
  • C2 domains are widely-spread protein signaling motifs that in classical PKCs act as Ca(2+)-binding modules. However, the molecular mechanisms of their targeting process at the plasma membrane remain poorly understood. Here, the crystal structure of P ...

    C2 domains are widely-spread protein signaling motifs that in classical PKCs act as Ca(2+)-binding modules. However, the molecular mechanisms of their targeting process at the plasma membrane remain poorly understood. Here, the crystal structure of PKCalpha-C2 domain in complex with Ca(2+), 1,2-dihexanoyl-sn-glycero-3-[phospho-L-serine] (PtdSer), and 1,2-diayl-sn-glycero-3-[phosphoinositol-4,5-bisphosphate] [PtdIns(4,5)P(2)] shows that PtdSer binds specifically to the calcium-binding region, whereas PtdIns(4,5)P(2) occupies the concave surface of strands beta3 and beta4. Strikingly, the structure reveals a PtdIns(4,5)P(2)-C2 domain-binding mode in which the aromatic residues Tyr-195 and Trp-245 establish direct interactions with the phosphate moieties of the inositol ring. Mutations that abrogate Tyr-195 and Trp-245 recognition of PtdIns(4,5)P(2) severely impaired the ability of PKCalpha to localize to the plasma membrane. Notably, these residues are highly conserved among C2 domains of topology I, and a general mechanism of C2 domain-membrane docking mediated by PtdIns(4,5)P(2) is presented.


    Organizational Affiliation

    Department of Bioquímica y Biología Molecular A, Facultad de Veterinaria, Universidad de Murcia, 30100 Murcia, Spain.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Protein kinase C alpha type
A
137Rattus norvegicusMutation(s): 0 
Gene 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
PT5
Query on PT5

Download SDF File 
Download CCD File 
A
(1S)-2-{[(R)-hydroxy{[(1R,2R,3S,4R,5R,6S)-2,3,6-trihydroxy-4,5-bis(phosphonooxy)cyclohexyl]oxy}phosphoryl]oxy}-1-[(octadecanoyloxy)methyl]ethyl (8E,11E)-icosa-5,8,11,14-tetraenoate
Phosphatidylinositol 4,5-bisphosphate; PtdIns(4,5)P2
C47 H85 O19 P3
CNWINRVXAYPOMW-IJHFYCNNSA-N
 Ligand Interaction
PO4
Query on PO4

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

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Download CCD File 
A
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
PT5Kd: 1800 nM PDBBIND
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.277 
  • R-Value Work: 0.243 
  • Space Group: P 32 2 1
Unit Cell:
Length (Å)Angle (°)
a = 57.848α = 90.00
b = 57.848β = 90.00
c = 90.479γ = 120.00
Software Package:
Software NamePurpose
ADSCdata collection
MOSFLMdata reduction
REFMACrefinement
SCALAdata scaling
AMoREphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2009-05-05
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Advisory, Version format compliance