Crystal structure of a UDP-glucose-specific glycosyltransferase from a Mycobacterium species

J Biol Chem. 2008 Oct 10;283(41):27881-27890. doi: 10.1074/jbc.M801853200. Epub 2008 Jul 30.


Glycosyltransferases (GTs) are a large and ubiquitous family of enzymes that specifically transfer sugar moieties to a range of substrates. Mycobacterium tuberculosis contains a large number of GTs, many of which are implicated in cell wall synthesis, yet the majority of these GTs remain poorly characterized. Here, we report the high resolution crystal structures of an essential GT (MAP2569c) from Mycobacterium avium subsp. paratuberculosis (a close homologue of Rv1208 from M. tuberculosis) in its apo- and ligand-bound forms. The structure adopted the GT-A fold and possessed the characteristic DXD motif that coordinated an Mn(2+) ion. Atypical of most GTs characterized to date, MAP2569c exhibited specificity toward the donor substrate, UDP-glucose. The structure of this ligated complex revealed an induced fit binding mechanism and provided a basis for this unique specificity. Collectively, the structural features suggested that MAP2569c may adopt a "retaining" enzymatic mechanism, which has implications for the classification of other GTs in this large superfamily.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Amino Acid Motifs / physiology
  • Bacterial Proteins / chemistry*
  • Cell Wall / enzymology*
  • Crystallography, X-Ray
  • Glycosyltransferases / chemistry*
  • Glycosyltransferases / classification
  • Manganese / chemistry*
  • Mycobacterium / enzymology*
  • Substrate Specificity
  • Uridine Diphosphate Glucose / chemistry*


  • Bacterial Proteins
  • Manganese
  • Glycosyltransferases
  • Uridine Diphosphate Glucose

Associated data

  • PDB/3CKJ
  • PDB/3CKN
  • PDB/3CKO
  • PDB/3CKQ
  • PDB/3CKV