1IM0

OUTER MEMBRANE PHOSPHOLIPASE A FROM ESCHERICHIA COLI N156A ACTIVE SITE MUTANT PH 8.3


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.98 Å
  • R-Value Free: 0.266 
  • R-Value Work: 0.226 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Structural investigations of the active-site mutant Asn156Ala of outer membrane phospholipase A: function of the Asn-His interaction in the catalytic triad.

Snijder, H.J.Van Eerde, J.H.Kingma, R.L.Kalk, K.H.Dekker, N.Egmond, M.R.Dijkstra, B.W.

(2001) Protein Sci 10: 1962-1969

  • DOI: 10.1110/ps.17701
  • Primary Citation of Related Structures:  
    1ILD, 1IM0, 1ILZ

  • PubMed Abstract: 
  • Outer membrane phospholipase A (OMPLA) from Escherichia coli is an integral-membrane enzyme with a unique His-Ser-Asn catalytic triad. In serine proteases and serine esterases usually an Asp occurs in the catalytic triad; its role has been the subject of much debate ...

    Outer membrane phospholipase A (OMPLA) from Escherichia coli is an integral-membrane enzyme with a unique His-Ser-Asn catalytic triad. In serine proteases and serine esterases usually an Asp occurs in the catalytic triad; its role has been the subject of much debate. Here the role of the uncharged asparagine in the active site of OMPLA is investigated by structural characterization of the Asn156Ala mutant. Asparagine 156 is not involved in maintaining the overall active-site configuration and does not contribute significantly to the thermal stability of OMPLA. The active-site histidine retains an active conformation in the mutant notwithstanding the loss of the hydrogen bond to the asparagine side chain. Instead, stabilization of the correct tautomeric form of the histidine can account for the observed decrease in activity of the Asn156Ala mutant.


    Related Citations: 
    • Structural Evidence for Dimerization-Regulated Activation of an Integral Membrane Phospholipase
      Snijder, H.J., Ubarretxena-Belandia, I., Blaauw, M., Kalk, K.H., Verheij, H.M., Egmond, M.R., Dekker, N., Dijkstra, B.W.
      (1999) Nature 401: 717
    • Crystallization and Preliminary X-Ray Analysis of Outer Membrane Phospholipase A from Escherichia Coli
      Blaauw, M., Dekker, N., Verheij, H.M., Kalk, K.H., Dijkstra, B.W.
      (1995) FEBS Lett 373: 10

    Organizational Affiliation

    Laboratory of Biophysical Chemistry, BIOSON Research Institute, University of Groningen, 9747 AG Groningen, The Netherlands.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
OUTER MEMBRANE PHSOPHOLIPASE AA275Escherichia coliMutation(s): 0 
EC: 3.1.1.32 (PDB Primary Data), 3.1.1.4 (UniProt)
Membrane Entity: Yes 
UniProt
Find proteins for P0A921 (Escherichia coli (strain K12))
Explore P0A921 
Go to UniProtKB:  P0A921
Protein Feature View
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  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.98 Å
  • R-Value Free: 0.266 
  • R-Value Work: 0.226 
  • Space Group: P 31 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 78.462α = 90
b = 78.462β = 90
c = 101.424γ = 120
Software Package:
Software NamePurpose
AMoREphasing
CNSrefinement
DENZOdata reduction
SCALEPACKdata scaling
CCP4data scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2001-10-03
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Data collection, Derived calculations, Structure summary