2WO5

Structure of wild type E. coli N-acetylneuraminic acid lyase in space group P21 crystal form I


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Free: 0.272 
  • R-Value Work: 0.211 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural Insights Into Substrate Specificity in Variants of N-Acetylneuraminic Acid Lyase Produced by Directed Evolution.

Campeotto, I.Bolt, A.H.Harman, T.A.Dennis, C.A.Trinh, C.H.Phillips, S.E.V.Nelson, A.Pearson, A.R.Berry, A.

(2010) J.Mol.Biol. 404: 56

  • DOI: 10.1016/j.jmb.2010.08.008
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The substrate specificity of Escherichia coli N-acetylneuraminic acid lyase was previously switched from the natural condensation of pyruvate with N-acetylmannosamine, yielding N-acetylneuraminic acid, to the aldol condensation generating N-alkylcarb ...

    The substrate specificity of Escherichia coli N-acetylneuraminic acid lyase was previously switched from the natural condensation of pyruvate with N-acetylmannosamine, yielding N-acetylneuraminic acid, to the aldol condensation generating N-alkylcarboxamide analogues of N-acetylneuraminic acid. This was achieved by a single mutation of Glu192 to Asn. In order to analyze the structural changes involved and to more fully understand the basis of this switch in specificity, we have isolated all 20 variants of the enzyme at position 192 and determined the activities with a range of substrates. We have also determined five high-resolution crystal structures: the structures of wild-type E. coli N-acetylneuraminic acid lyase in the presence and in the absence of pyruvate, the structures of the E192N variant in the presence and in the absence of pyruvate, and the structure of the E192N variant in the presence of pyruvate and a competitive inhibitor (2R,3R)-2,3,4-trihydroxy-N,N-dipropylbutanamide. All structures were solved in space group P2(1) at resolutions ranging from 1.65 Å to 2.2 Å. A comparison of these structures, in combination with the specificity profiles of the variants, reveals subtle differences that explain the details of the specificity changes. This work demonstrates the subtleties of enzyme-substrate interactions and the importance of determining the structures of enzymes produced by directed evolution, where the specificity determinants may change from one substrate to another.


    Organizational Affiliation

    Astbury Center for Structural Molecular Biology, Garstang Building, University of Leeds, Leeds LS2 9JT, UK.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
N-ACETYLNEURAMINATE LYASE
A, B, C, D
304Escherichia coli (strain K12)Mutation(s): 0 
Gene Names: nanA (npl)
EC: 4.1.3.3
Find proteins for P0A6L4 (Escherichia coli (strain K12))
Go to UniProtKB:  P0A6L4
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Free: 0.272 
  • R-Value Work: 0.211 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 54.795α = 90.00
b = 142.167β = 109.01
c = 84.180γ = 90.00
Software Package:
Software NamePurpose
SCALAdata scaling
REFMACrefinement
REFMACphasing
MOSFLMdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2010-08-25
    Type: Initial release
  • Version 1.1: 2011-05-08
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance