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 1.2 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, 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 subjec ...

    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: 
    • 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
    • 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


    Organizational Affiliation

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




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
OUTER MEMBRANE PHSOPHOLIPASE A
A
275Escherichia coli (strain K12)Gene Names: pldA
EC: 3.1.1.4, 3.1.1.32
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: BETA-BARREL
Sub Group: 
Beta-Barrel Membrane Proteins: Monomeric/Dimeric
Protein: 
OmpLA (PldA) outer membrane phospholipase A monomer
Find proteins for P0A921 (Escherichia coli (strain K12))
Go to UniProtKB:  P0A921
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MPD
Query on MPD

Download SDF File 
Download CCD File 
A
(4S)-2-METHYL-2,4-PENTANEDIOL
C6 H14 O2
SVTBMSDMJJWYQN-YFKPBYRVSA-N
 Ligand Interaction
BOG
Query on BOG

Download SDF File 
Download CCD File 
A
B-OCTYLGLUCOSIDE
C14 H28 O6
HEGSGKPQLMEBJL-RKQHYHRCSA-N
 Ligand Interaction
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 = 90.00
b = 78.462β = 90.00
c = 101.424γ = 120.00
Software Package:
Software NamePurpose
CNSrefinement
AMoREphasing
CCP4data scaling
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2001-10-03
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance