Crystal structure of an H329A mutant of p. aeruginosa PMM/PGM

Experimental Data Snapshot

  • Resolution: 1.80 Å
  • R-Value Free: 0.219 
  • R-Value Work: 0.186 
  • R-Value Observed: 0.188 

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Identification of an essential active-site residue in the alpha-D-phosphohexomutase enzyme superfamily.

Lee, Y.Mehra-Chaudhary, R.Furdui, C.Beamer, L.J.

(2013) FEBS J 280: 2622-2632

  • DOI: https://doi.org/10.1111/febs.12249
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Enzymes in the α-d-phosphohexomutase superfamily catalyze the conversion of 1-phosphosugars to their 6-phospho counterparts. Their phosphoryl transfer reaction has long been proposed to require general acid-base catalysts, but candidate residues for these key roles have not been identified. In this study, we show through mutagenesis and kinetic studies that a histidine (His329) in the active site is critical for enzyme activity in a well-studied member of the superfamily, phosphomannomutase/phosphoglucomutase from Pseudomonas aeruginosa. Crystallographic characterization of an H329A mutant protein showed no significant changes from the wild-type enzyme, excluding structural disruption as the source of its compromised activity. Mutation of the structurally analogous lysine residue in a related protein, phosphoglucomutase from Salmonella typhimurium, also results in significant catalytic impairment. Analyses of protein-ligand complexes of the P. aeruginosa enzyme show that His329 is appropriately positioned to abstract a proton from the O1/O6 hydroxyl of the phosphosugar substrates, and thus may serve as the general base in the reaction. Histidine is strongly conserved at this position in many proteins in the superfamily, and lysine is also often conserved at a structurally corresponding position, particularly in the phosphoglucomutase enzyme sub-group. These studies shed light on the mechanism of this important enzyme superfamily, and may facilitate the design of mechanism-based inhibitors. Structural data have been deposited in the Protein Data Bank with accession number 4IL8.

  • Organizational Affiliation

    Chemistry Department, University of Missouri, Columbia, MO 65211, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Phosphomannomutase/phosphoglucomutase463Pseudomonas aeruginosa PAO1Mutation(s): 1 
Gene Names: algCPA5322
EC: (PDB Primary Data), (PDB Primary Data)
Find proteins for P26276 (Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1))
Explore P26276 
Go to UniProtKB:  P26276
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP26276
Sequence Annotations
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on SEP
Experimental Data & Validation

Experimental Data

  • Resolution: 1.80 Å
  • R-Value Free: 0.219 
  • R-Value Work: 0.186 
  • R-Value Observed: 0.188 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 70.962α = 90
b = 72.906β = 90
c = 93.03γ = 90
Software Package:
Software NamePurpose
d*TREKdata reduction
d*TREKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-08-14
    Type: Initial release
  • Version 1.1: 2017-11-15
    Changes: Advisory, Refinement description
  • Version 1.2: 2023-11-29
    Changes: Advisory, Data collection, Database references, Derived calculations