Crystal Structure of Phosphoenolpyruvate Mutase Complexed with Sulfopyruvate

Experimental Data Snapshot

  • Resolution: 2.25 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.179 
  • R-Value Observed: 0.185 

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Dissociative phosphoryl transfer in PEP mutase catalysis: structure of the enzyme/sulfopyruvate complex and kinetic properties of mutants.

Liu, S.Lu, Z.Jia, Y.Dunaway-Mariano, D.Herzberg, O.

(2002) Biochemistry 41: 10270-10276

  • DOI: https://doi.org/10.1021/bi026024v
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The crystal structure of PEP mutase from Mytilus edulis in complex with a substrate-analogue inhibitor, sulfopyruvate S-pyr (K(i) = 22 microM), has been determined at 2.25 A resolution. Mg(II)-S-pyr binds in the alpha/beta barrel's central channel, at the C-termini of the beta-strands. The binding mode of S-pyr's pyruvyl moiety resembles the binding mode of oxalate seen earlier. The location of the sulfo group of S-pyr is postulated to mimic the phosphonyl group of the product phosphonopyruvate (P-pyr). This sulfo group interacts with the guanidinium group of Arg159, but it is not aligned for nucleopilic attack by neighboring basic amino side chains. Kinetic analysis of site directed mutants, probing the key active site residues Asp58, Arg159, Asn122, and His190 correlate well with the structural information. The results presented here rule out a phosphoryl transfer mechanism involving a double displacement, and suggest instead that PEP mutase catalysis proceeds via a dissociative mechanism in which the pyruvyl C(3) adds to the same face of the phosphorus from which the C(2)O departs. We propose that Arg159 and His190 serve to hold the phosphoryl/metaphosphate/phosphonyl group stationary along the reaction pathway, while the pyruvyl C(1)-C(2) bond rotates upon formation of the metaphosphate. In agreement with published data, the phosphoryl group transfer occurs on the Si-face of PEP with retention of configuration at phosphorus.

  • Organizational Affiliation

    Center for Advanced Research in Biotechnology, University of Maryland Biotechnology Institute, 9600 Gudelsky Drive, Rockville, Maryland 20850, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
295Mytilus edulisMutation(s): 0 
Find proteins for P56839 (Mytilus edulis)
Explore P56839 
Go to UniProtKB:  P56839
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP56839
Sequence Annotations
  • Reference Sequence
Small Molecules
Binding Affinity Annotations 
IDSourceBinding Affinity
SPV Binding MOAD:  1M1B Ki: 2.20e+4 (nM) from 1 assay(s)
PDBBind:  1M1B Ki: 2.20e+4 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Resolution: 2.25 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.179 
  • R-Value Observed: 0.185 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 90.024α = 90
b = 130.441β = 90
c = 90.475γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2002-08-28
    Type: Initial release
  • Version 1.1: 2008-04-28
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Derived calculations, Version format compliance
  • Version 1.3: 2024-02-14
    Changes: Data collection, Database references, Derived calculations, Refinement description