1L8S

CARBOXYLIC ESTER HYDROLASE COMPLEX (DIMERIC PLA2 + LPC-ether + ACETATE + PHOSPHATE IONS)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.55 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.183 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Crystal structure of phospholipase A2 Complex with the Hydrolysis Products of Platelet Activating Factor: Equilibrium Binding of Fatty Acid and Lysophospholipid-ether at the Active Site may be Mutually Exclusive

Pan, Y.H.Yu, B.-Z.Berg, O.G.Jain, M.K.Bahnson, B.J.

(2002) Biochemistry 41: 14790-14800


  • PubMed Abstract: 
  • We have solved the 1.55 A crystal structure of the anion-assisted dimer of porcine pancreatic group IB phospholipase A2 (PLA2), complexed with the products of hydrolysis of the substrate platelet activating factor. The dimer contains five coplanar ph ...

    We have solved the 1.55 A crystal structure of the anion-assisted dimer of porcine pancreatic group IB phospholipase A2 (PLA2), complexed with the products of hydrolysis of the substrate platelet activating factor. The dimer contains five coplanar phosphate anions bound at the contact surface between the two PLA2 subunits. This structure parallels a previously reported anion-assisted dimer that mimics the tetrahedral intermediate of PLA2 bound to a substrate interface [Pan, Y. H., et al. (2001) Biochemistry 40, 609-617]. The dimer structure has a molecule of the product acetate bound in subunit A and the other product 1-octadecyl-sn-glycero-3-phosphocholine (LPC-ether) to subunit B. Therefore, this structure is of the two individual product binary complexes and not of a ternary complex with both products in one active site of PLA2. Protein crystals with bound products were only obtained by cocrystallization starting from the initial substrate. In contrast, an alternate crystal form was obtained when PLA2 was cocrystallized with LPC-ether and succinate, and this crystal form did not contain bound products. The product bound structure has acetate positioned in the catalytic site of subunit A such that one of its oxygen atoms is located 3.5 A from the catalytic calcium. Likewise, a longer than typical Ca-to-Gly(32) carbonyl distance of 3.4 A results in a final Ca coordination that is four-coordinate and has distorted geometry. The other oxygen of acetate makes hydrogen bonds with N(delta)(1)-His(48), O(delta)(1)-Asp(49), and the catalytic assisting water (w7). In contrast, the glycerophosphocholine headgroup of LPC-ether in subunit B makes no contacts with calcium or with the catalytic residues His(48) or Asp(49). The tail of the LPC-ether is located near the active site pocket with the last nine carbons of the sn-1- acyl chain refined in two alternate conformations. The remaining atoms of the LPC-ether product have been modeled into the solvent channel but have their occupancies set to zero in the refined model due to disorder. Together, the crystallographic and equilibrium binding results with the two products show that the simultaneous binding of both the products in a single active site is not favored.


    Organizational Affiliation

    Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, and Department of Molecular Evolution, Uppsala University Evolutionary Biology Center, Uppsala, Sweden.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PHOSPHOLIPASE A2, MAJOR ISOENZYME
A, B
124Sus scrofaMutation(s): 0 
Gene Names: PLA2G1B
EC: 3.1.1.4
Find proteins for P00592 (Sus scrofa)
Go to Gene View: PLA2G1B
Go to UniProtKB:  P00592
Small Molecules
Ligands 5 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PO4
Query on PO4

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

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Download CCD File 
A
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
ACT
Query on ACT

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Download CCD File 
A
ACETATE ION
C2 H3 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-M
 Ligand Interaction
CA
Query on CA

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Download CCD File 
A, B
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
LPE
Query on LPE

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Download CCD File 
B
1-O-OCTADECYL-SN-GLYCERO-3-PHOSPHOCHOLINE
LPC-ETHER
C26 H57 N O6 P
XKBJVQHMEXMFDZ-AREMUKBSSA-O
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.55 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.183 
  • Space Group: P 31
Unit Cell:
Length (Å)Angle (°)
a = 65.166α = 90.00
b = 65.166β = 90.00
c = 62.963γ = 120.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
SHELXL-97refinement
DENZOdata reduction
AMoREphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2002-12-25
    Type: Initial release
  • Version 1.1: 2008-04-28
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2018-01-31
    Type: Advisory, Experimental preparation