Crystal structure of glucosyl-3-phosphoglycerate synthase from Mycobacterium tuberculosis

Experimental Data Snapshot

  • Resolution: 2.60 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.215 
  • R-Value Observed: 0.216 

wwPDB Validation   3D Report Full Report

This is version 1.3 of the entry. See complete history

Re-refinement Note

A newer entry is available that reflects an alternative modeling of the original data: 5JQQ


Mechanistic insights into the retaining glucosyl-3-phosphoglycerate synthase from mycobacteria.

Urresti, S.Albesa-Jove, D.Schaeffer, F.Pham, H.T.Kaur, D.Gest, P.van der Woerd, M.J.Carreras-Gonzalez, A.Lopez-Fernandez, S.Alzari, P.M.Brennan, P.J.Jackson, M.Guerin, M.E.

(2012) J Biol Chem 287: 24649-24661

  • DOI: https://doi.org/10.1074/jbc.M112.368191
  • Primary Citation of Related Structures:  
    4DDZ, 4DE7, 4DEC

  • PubMed Abstract: 

    Considerable progress has been made in recent years in our understanding of the structural basis of glycosyl transfer. Yet the nature and relevance of the conformational changes associated with substrate recognition and catalysis remain poorly understood. We have focused on the glucosyl-3-phosphoglycerate synthase (GpgS), a "retaining" enzyme, that initiates the biosynthetic pathway of methylglucose lipopolysaccharides in mycobacteria. Evidence is provided that GpgS displays an unusually broad metal ion specificity for a GT-A enzyme, with Mg(2+), Mn(2+), Ca(2+), Co(2+), and Fe(2+) assisting catalysis. In the crystal structure of the apo-form of GpgS, we have observed that a flexible loop adopts a double conformation L(A) and L(I) in the active site of both monomers of the protein dimer. Notably, the L(A) loop geometry corresponds to an active conformation and is conserved in two other relevant states of the enzyme, namely the GpgS·metal·nucleotide sugar donor and the GpgS·metal·nucleotide·acceptor-bound complexes, indicating that GpgS is intrinsically in a catalytically active conformation. The crystal structure of GpgS in the presence of Mn(2+)·UDP·phosphoglyceric acid revealed an alternate conformation for the nucleotide sugar β-phosphate, which likely occurs upon sugar transfer. Structural, biochemical, and biophysical data point to a crucial role of the β-phosphate in donor and acceptor substrate binding and catalysis. Altogether, our experimental data suggest a model wherein the catalytic site is essentially preformed, with a few conformational changes of lateral chain residues as the protein proceeds along the catalytic cycle. This model of action may be applicable to a broad range of GT-A glycosyltransferases.

  • Organizational Affiliation

    Unidad de Biofísica, Centro Mixto Consejo Superior de Investigaciones Científicas-Universidad del País Vasco/Euskal Herriko Unibertsitatea, Barrio Sarriena s/n, Leioa, Bizkaia, 48940, Spain.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
GLUCOSYL-3-PHOSPHOGLYCERATE SYNTHASE (GpgS)344Mycobacterium tuberculosis H37RvMutation(s): 0 
Gene Names: gpgSMT1246Rv1208
EC: 2.4.1
Find proteins for P9WMW9 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Explore P9WMW9 
Go to UniProtKB:  P9WMW9
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP9WMW9
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.60 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.215 
  • R-Value Observed: 0.216 
  • Space Group: I 41
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 98.85α = 90
b = 98.85β = 90
c = 127.64γ = 90
Software Package:
Software NamePurpose
Blu-Icedata collection
d*TREKdata reduction
d*TREKdata scaling

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-06-06
    Type: Initial release
  • Version 1.1: 2012-06-13
    Changes: Database references
  • Version 1.2: 2013-01-09
    Changes: Database references
  • Version 1.3: 2024-02-28
    Changes: Data collection, Database references, Derived calculations