1Q7A

Crystal structure of the complex formed between russell's viper phospholipase A2 and an antiinflammatory agent oxyphenbutazone at 1.6A resolution


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.6 Å
  • R-Value Free: 0.213 
  • R-Value Work: 0.209 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Phospholipase A2 as a target protein for nonsteroidal anti-inflammatory drugs (NSAIDS): crystal structure of the complex formed between phospholipase A2 and oxyphenbutazone at 1.6 A resolution.

Singh, N.Jabeen, T.Somvanshi, R.K.Sharma, S.Dey, S.Singh, T.P.

(2004) Biochemistry 43: 14577-14583

  • DOI: 10.1021/bi0483561

  • PubMed Abstract: 
  • Phospholipase A(2) (PLA(2); EC 3.1.1.4) is a key enzyme involved in the production of proinflammatory mediators known as eicosanoids. The binding of the substrate to PLA(2) occurs through a well-formed hydrophobic channel. To determine the viability ...

    Phospholipase A(2) (PLA(2); EC 3.1.1.4) is a key enzyme involved in the production of proinflammatory mediators known as eicosanoids. The binding of the substrate to PLA(2) occurs through a well-formed hydrophobic channel. To determine the viability of PLA(2) as a target molecule for the structure-based drug design against inflammation, arthritis, and rheumatism, the crystal structure of the complex of PLA(2) with a known anti-inflammatory compound oxyphenbutazone (OPB), which has been determined at 1.6 A resolution. The structure has been refined to an R factor of 0.209. The structure contains 1 molecule each of PLA(2) and OPB with 2 sulfate ions and 111 water molecules. The binding studies using surface plasmon resonance show that OPB binds to PLA(2) with a dissociation constant of 6.4 x 10(-8) M. The structure determination has revealed the presence of an OPB molecule at the binding site of PLA(2). It fits well in the binding region, thus displaying a high level of complementarity. The structure also indicates that OPB works as a competitive inhibitor. A large number of hydrophobic interactions between the enzyme and the OPB molecule have been observed. The hydrophobic interactions involving residues Tyr(52) and Lys(69) with OPB are particularly noteworthy. Other residues of the hydrophobic channel such as Leu(3), Phe(5), Met(8), Ile(9), and Ala(18) are also interacting extensively with the inhibitor. The crystal structure clearly reveals that the binding of OPB to PLA(2) is specific in nature and possibly suggests that the basis of its anti-inflammatory effects may be due to its binding to PLA(2) as well.


    Organizational Affiliation

    Department of Biophysics, All India Institute of Medical Sciences, New Delhi 110029, India.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Phospholipase A2 VRV-PL-VIIIa
A
121Daboia russeliiMutation(s): 0 
EC: 3.1.1.4
Find proteins for P59071 (Daboia russelii)
Go to UniProtKB:  P59071
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
OPB
Query on OPB

Download SDF File 
Download CCD File 
A
4-BUTYL-1-(4-HYDROXYPHENYL)-2-PHENYLPYRAZOLIDINE-3,5-DIONE
OXYPHENBUTAZONE
C19 H20 N2 O3
HFHZKZSRXITVMK-KRWDZBQOSA-N
 Ligand Interaction
SO4
Query on SO4

Download SDF File 
Download CCD File 
A
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
MOH
Query on MOH

Download SDF File 
Download CCD File 
A
METHANOL
C H4 O
OKKJLVBELUTLKV-UHFFFAOYSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
OPBKd: 64 nM BINDINGMOAD
OPBKd: 64 nM PDBBIND
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.6 Å
  • R-Value Free: 0.213 
  • R-Value Work: 0.209 
  • Space Group: P 43
Unit Cell:
Length (Å)Angle (°)
a = 53.000α = 90.00
b = 53.000β = 90.00
c = 48.200γ = 90.00
Software Package:
Software NamePurpose
DENZOdata reduction
CNSrefinement
AMoREphasing
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-05-11
    Type: Initial release
  • Version 1.1: 2008-04-29
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance