thymidylyltransferase complexed with TTP

Experimental Data Snapshot

  • Resolution: 2.10 Å
  • R-Value Free: 0.235 
  • R-Value Work: 0.198 

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Structure, mechanism and engineering of a nucleotidylyltransferase as a first step toward glycorandomization.

Barton, W.A.Lesniak, J.Biggins, J.B.Jeffrey, P.D.Jiang, J.Rajashankar, K.R.Thorson, J.S.Nikolov, D.B.

(2001) Nat Struct Biol 8: 545-551

  • DOI: https://doi.org/10.1038/88618
  • Primary Citation of Related Structures:  
    1IIM, 1IIN

  • PubMed Abstract: 

    Metabolite glycosylation is affected by three classes of enzymes: nucleotidylyltransferases, which activate sugars as nucleotide diphospho-derivatives, intermediate sugar-modifying enzymes and glycosyltransferases, which transfer the final derivatized activated sugars to aglycon substrates. One of the first crystal structures of an enzyme responsible for the first step in this cascade, alpha-D-glucopyranosyl phosphate thymidylyltransferase (Ep) from Salmonella, in complex with product (UDP-Glc) and substrate (dTTP) is reported at 2.0 A and 2.1 A resolution, respectively. These structures, in conjunction with the kinetic characterization of Ep, clarify the catalytic mechanism of this important enzyme class. Structure-based engineering of Ep produced modified enzymes capable of utilizing 'unnatural' sugar phosphates not accepted by wild type Ep. The demonstrated ability to alter nucleotidylyltransferase specificity by design is an integral component of in vitro glycosylation systems developed for the production of diverse glycorandomized libraries.

  • Organizational Affiliation

    Cellular Biochemistry and Biophysics Program, Joan and Sanford I. Weill Graduate School of Medical Sciences, Cornell University, 1275 York Avenue, New York 10021, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
glucose-1-phosphate thymidylyltransferase
A, B
292Salmonella entericaMutation(s): 0 
Find proteins for P26393 (Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720))
Explore P26393 
Go to UniProtKB:  P26393
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP26393
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.10 Å
  • R-Value Free: 0.235 
  • R-Value Work: 0.198 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 120.06α = 90
b = 120.06β = 90
c = 94.41γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2001-05-09
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Derived calculations, Version format compliance
  • Version 1.3: 2024-02-07
    Changes: Data collection, Database references, Derived calculations