Crystal structure of E. coli glucose-1-phosphate uridylyltransferase

Experimental Data Snapshot

  • Resolution: 1.95 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.198 
  • R-Value Observed: 0.202 

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The molecular architecture of glucose-1-phosphate uridylyltransferase

Thoden, J.B.Holden, H.M.

(2007) Protein Sci 16: 432-440

  • DOI: https://doi.org/10.1110/ps.062626007
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Glucose-1-phosphate uridylyltransferase, also referred to as UDP-glucose pyrophosphorylase or UGPase, catalyzes the formation of UDP-glucose from glucose-1-phosphate and UTP. Not surprisingly, given the central role of UDP-glucose in glycogen synthesis and in the production of glycolipids, glycoproteins, and proteoglycans, the enzyme is ubiquitous in nature. Interestingly, however, the prokaryotic and eukaryotic forms of the enzyme are unrelated in amino acid sequence and structure. Here we describe the cloning and structural analysis to 1.9 A resolution of the UGPase from Escherichia coli. The protein is a tetramer with 222 point group symmetry. Each subunit of the tetramer is dominated by an eight-stranded mixed beta-sheet. There are two additional layers of beta-sheet (two and three strands) and 10 alpha-helices. The overall fold of the molecule is remarkably similar to that observed for glucose-1-phosphate thymidylyltransferase in complex with its product, dTDP-glucose. On the basis of this similarity, a UDP-glucose moiety has been positioned into the active site of UGPase. This protein/product model predicts that the side chains of Gln 109 and Asp 137, respectively, serve to anchor the uracil ring and the ribose of UDP-glucose to the protein. The beta-phosphoryl group of the product is predicted to lie within hydrogen bonding distance to the epsilon-nitrogen of Lys 202 whereas the carboxylate group of Glu 201 is predicted to bridge the 2'- and 3'-hydroxyl groups of the glucosyl moiety. Details concerning the overall structure of UGPase and a comparison with glucose-1-phosphate thymidylyltransferase are presented.

  • Organizational Affiliation

    Department of Biochemistry, University of Wisconsin, Madison, Wisconsin 53706, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
UTP--glucose-1-phosphate uridylyltransferase
A, B, C, D
302Escherichia coliMutation(s): 0 
Gene Names: galU
Find proteins for P0AEP3 (Escherichia coli (strain K12))
Explore P0AEP3 
Go to UniProtKB:  P0AEP3
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0AEP3
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.95 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.198 
  • R-Value Observed: 0.202 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 63.9α = 90
b = 109.3β = 93.8
c = 100.5γ = 90
Software Package:
Software NamePurpose
PDB_EXTRACTdata extraction
PROTEUM PLUSdata collection
SAINTdata reduction
SADABSdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-12-12
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2024-03-13
    Changes: Data collection, Database references