3ORS

Crystal Structure of N5-Carboxyaminoimidazole Ribonucleotide Mutase from Staphylococcus aureus


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.45 Å
  • R-Value Free: 0.203 
  • R-Value Work: 0.177 
  • R-Value Observed: 0.178 

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This is version 1.1 of the entry. See complete history


Literature

Structural and biochemical characterization of N5-carboxyaminoimidazole ribonucleotide synthetase and N5-carboxyaminoimidazole ribonucleotide mutase from Staphylococcus aureus.

Brugarolas, P.Duguid, E.M.Zhang, W.Poor, C.B.He, C.

(2011) Acta Crystallogr D Biol Crystallogr 67: 707-715

  • DOI: 10.1107/S0907444911023821
  • Primary Citation of Related Structures:  
    3ORQ, 3ORR, 3ORS

  • PubMed Abstract: 
  • With the rapid rise of methicillin-resistant Staphylococcus aureus infections, new strategies against S. aureus are urgently needed. De novo purine biosynthesis is a promising yet unexploited target, insofar as abundant evidence has shown that bacteria with compromised purine biosynthesis are attenuated ...

    With the rapid rise of methicillin-resistant Staphylococcus aureus infections, new strategies against S. aureus are urgently needed. De novo purine biosynthesis is a promising yet unexploited target, insofar as abundant evidence has shown that bacteria with compromised purine biosynthesis are attenuated. Fundamental differences exist within the process by which humans and bacteria convert 5-aminoimidazole ribonucleotide (AIR) to 4-carboxy-5-aminoimidazole ribonucleotide (CAIR). In bacteria, this transformation occurs through a two-step conversion catalyzed by PurK and PurE; in humans, it is mediated by a one-step conversion catalyzed by class II PurE. Thus, these bacterial enzymes are potential targets for selective antibiotic development. Here, the first comprehensive structural and biochemical characterization of PurK and PurE from S. aureus is presented. Structural analysis of S. aureus PurK reveals a nonconserved phenylalanine near the AIR-binding site that occupies the putative position of the imidazole ring of AIR. Mutation of this phenylalanine to isoleucine or tryptophan reduced the enzyme efficiency by around tenfold. The K(m) for bicarbonate was determined for the first time for a PurK enzyme and was found to be ∼18.8 mM. The structure of PurE is described in comparison to that of human class II PurE. It is confirmed biochemically that His38 is essential for function. These studies aim to provide foundations for future structure-based drug-discovery efforts against S. aureus purine biosynthesis.


    Organizational Affiliation

    Department of Chemistry and Institute for Biophysical Dynamics, The University of Chicago, 929 East 57th Street, GCIS E321, Chicago, IL 60637, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
N5-Carboxyaminoimidazole Ribonucleotide Mutase ABCDEFGH163Staphylococcus aureus subsp. aureus str. NewmanMutation(s): 0 
Gene Names: NWMN_0933purE
EC: 5.4.99.18
Find proteins for A0A0H3K7Y1 (Staphylococcus aureus (strain Newman))
Explore A0A0H3K7Y1 
Go to UniProtKB:  A0A0H3K7Y1
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.45 Å
  • R-Value Free: 0.203 
  • R-Value Work: 0.177 
  • R-Value Observed: 0.178 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 81.302α = 90
b = 78.207β = 113.94
c = 93.039γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
PHASERphasing
REFMACrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2011-07-20
    Type: Initial release
  • Version 1.1: 2012-03-28
    Changes: Database references