2PHI

A LARGE CONFORMATIONAL CHANGE IS FOUND IN THE CRYSTAL STRUCTURE OF THE PORCINE PANCREATIC PHOSPHOLIPASE A2 POINT MUTANT F63V


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Work: 0.176 

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This is version 1.3 of the entry. See complete history


Literature

Crystal structure of a porcine pancreatic phospholipase A2 mutant. A large conformational change caused by the F63V point mutation.

Thunnissen, M.M.Franken, P.A.de Haas, G.H.Drenth, J.Kalk, K.H.Verheij, H.M.Dijkstra, B.W.

(1993) J Mol Biol 232: 839-855

  • DOI: https://doi.org/10.1006/jmbi.1993.1435
  • Primary Citation of Related Structures:  
    2PHI

  • PubMed Abstract: 

    The highly homologous bovine and porcine pancreatic phospholipase A2 (85% amino acid residue identity) show a large conformational difference in the loop from residue 59 to 71. In bovine phospholipase A2 residues 59 to 66 adopt an alpha-helix conformation, while residues 67 to 71 are in a surface loop. Residues 59 to 66 in the porcine enzyme have a random coil conformation, and residues 67 to 71 form a short 3(10)-helix. It has been suggested that most probably this conformational difference is caused by the substitution Val63 (bovine) to Phe63 (porcine) in the otherwise invariant loop 59 to 70. To test this hypothesis, a mutant porcine phospholipase A2 was constructed in which residue Phe63 was replaced by a Val. The activity of this F63V mutant towards aggregated substrates was about half the activity of wild-type porcine phospholipase A2, but significantly different from that of the bovine enzyme. The affinity for zwitterionic interfaces was found to be intermediate between porcine and bovine phospholipase. The mutation did not have any effect on the stability of the enzyme towards denaturation by guanidine.HCl. The F63V mutant was crystallized in space group P2(1)2(1)2(1) with cell dimensions a = 79.88 A, b = 65.23 A, c = 52.62 A, with two molecules per asymmetric unit. Its three-dimensional structure was solved by molecular replacement methods, and refined to a crystallographic R-factor of 17.6% for all data between 10 and 2.2 A resolution. In one molecule the 58 to 71 loop is in very weak density, suggesting a high degree of disorder or flexibility. The conformation of the same loop in the other molecule could be determined unambiguously. It shows a conformation which resembles more that of bovine phospholipase A2 than that of porcine phospholipase. It is concluded that indeed the single F63V substitution causes a dramatic conformational change.


  • Organizational Affiliation

    Laboratory of Biophysical Chemistry and BIOSON Research Institute, University of Groningen, The Netherlands.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
PHOSPHOLIPASE A2
A, B
124Sus scrofaMutation(s): 0 
EC: 3.1.1.4
UniProt
Find proteins for P00592 (Sus scrofa)
Explore P00592 
Go to UniProtKB:  P00592
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP00592
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Work: 0.176 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 79.88α = 90
b = 65.23β = 90
c = 52.62γ = 90
Software Package:
Software NamePurpose
X-PLORmodel building
TNTrefinement
X-PLORphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1993-07-15
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2012-01-25
    Changes: Database references