Crystal structure of α-1,3-galactosyltransferase (α3GT) in a complex with p-nitrophenyl-β-galactoside (pNPβGal)

H Jamaluddin, P Tumbale, T A Ferns, N Thiyagarajan, K Brew, K Ravi Acharya

Research output: Contribution to journalArticlepeer-review

4 Citations (SciVal)


The specificities of glycosyltransferases make them useful for the synthesis of biologically active oligosaccharides, but also restrict their range of products. In substrate engineering, substrate promiscuity is enhanced by attaching removable interactive groups to weak substrates. Thus, the attachment of β p-nitrophenyl converts galactose from a poor into a good substrate of α-1,3-galactosyltransferase. The crystallographic structure of a complex of α3GT containing p-nitrophenyl-β-galactoside shows that the p-nitrophenyl binds similarly to the N-acetylglucosamine of the substrate, N-acetyllactosamine, interacting with the indole of Trp249. p-Nitrophenyl, unlike N-acetylglucosamine, makes no H-bonds but has more non-polar interactions, making it an effective monosaccharide mimetic.
Original languageEnglish
Pages (from-to)601-604
Number of pages4
JournalBiochemical and Biophysical Research Communications
Issue number4
Publication statusPublished - 7 Aug 2009


  • α-1
  • Crystal structure
  • Substrate binding
  • Enzyme kinetics
  • 3-Galactosyltransferase
  • Glycosyltransferase


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