4QEM

Crystal structure of the complex of Phospholipase A2 With P-Coumaric Acid At 1.2 A Resolution


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.20 Å
  • R-Value Free: 0.221 
  • R-Value Work: 0.191 
  • R-Value Observed: 0.192 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Structures and binding studies of the complexes of phospholipase A2 with five inhibitors

Shukla, P.K.Gautam, L.Sinha, M.Kaur, P.Sharma, S.Singh, T.P.

(2015) Biochim Biophys Acta 1854: 269-277

  • DOI: 10.1016/j.bbapap.2014.12.017
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • Phospholipase A2 (PLA2) catalyzes the hydrolysis of phospholipids into arachidonic acid and lysophospholipids. Arachidonic acid is used as a substrate in the next step of the multistep pathway leading to the production of eicosanoids. The eicosanoids ...

    Phospholipase A2 (PLA2) catalyzes the hydrolysis of phospholipids into arachidonic acid and lysophospholipids. Arachidonic acid is used as a substrate in the next step of the multistep pathway leading to the production of eicosanoids. The eicosanoids, in extremely low concentrations, are required in a number of physiological processes. However, the increase in their concentrations above the essential physiological requirements leads to various inflammatory conditions. In order to prevent the unwanted rise in the concentrations of eicosanoids, the actions of PLA2 and other enzymes of the pathway need to be blocked. We report here the structures of five complexes of group IIA PLA2 from Daboia russelli pulchella with tightly binding inhibitors, (i) p-coumaric acid, (ii) resveratrol, (iii) spermidine, (iv) corticosterone and (v) gramine derivative. The binding studies using fluorescence spectroscopy and surface plasmon resonance techniques for the interactions of PLA2 with the above five compounds showed high binding affinities with values of dissociation constants (KD) ranging from 3.7×10(-8) M to 2.1×10(-9) M. The structure determinations of the complexes of PLA2 with the above five compounds showed that all the compounds bound to PLA2 in the substrate binding cleft. The protein residues that contributed to the interactions with these compounds included Leu2, Leu3, Phe5, Gly6, Ile9, Ala18, Ile19, Trp22, Ser23, Cys29, Gly30, Cys45, His48, Asp49 and Phe106. The positions of side chains of several residues including Leu2, Leu3, Ile19, Trp31, Lys69, Ser70 and Arg72 got significantly shifted while the positions of active site residues, His48, Asp49, Tyr52 and Asp99 were unperturbed.


    Organizational Affiliation

    Department of Biophysics, All India Institute of Medical Sciences, New Delhi, India. Electronic address: tpsingh.aiims@gmail.com.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Phospholipase A2 VRV-PL-VIIIa
A
121Daboia russelii pulchellaMutation(s): 0 
EC: 3.1.1.4
Find proteins for P59071 (Daboia russelii)
Go to UniProtKB:  P59071
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
HC4
Query on HC4

Download CCD File 
A
4'-HYDROXYCINNAMIC ACID
C9 H8 O3
NGSWKAQJJWESNS-ZZXKWVIFSA-N
 Ligand Interaction
SO4
Query on SO4

Download CCD File 
A
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.20 Å
  • R-Value Free: 0.221 
  • R-Value Work: 0.191 
  • R-Value Observed: 0.192 
  • Space Group: P 43
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 52.29α = 90
b = 52.29β = 90
c = 47.25γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
AMoREphasing
REFMACrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-06-18
    Type: Initial release
  • Version 1.1: 2015-01-28
    Changes: Database references, Structure summary