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Related Experiment Videos

Substrate-induced conformational changes in glycosyltransferases.

Pradman K Qasba1, Boopathy Ramakrishnan, Elizabeth Boeggeman

  • 1Structural Glycobiology Section, Laboratory of Experimental and Computational Biology, CCR, NCI-Frederick, MD 21702, USA. qsaba@helix.nih.gov

Trends in Biochemical Sciences
|January 18, 2005
PubMed
Summary
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Glycosyltransferases use flexible loops that change conformation to bind sugar donors and create acceptor sites for oligosaccharide synthesis. This enzyme mechanism ensures specific sugar transfer and product release.

Area of Science:

  • Biochemistry
  • Enzymology
  • Glycobiology

Background:

  • Oligosaccharide chains are crucial components of glycoproteins, glycolipids, and glycosaminoglycans.
  • Glycosyltransferases catalyze the synthesis of these complex carbohydrates.
  • Understanding glycosyltransferase mechanisms is key to deciphering cellular processes and disease.

Purpose of the Study:

  • To elucidate the structural and dynamic mechanisms of glycosyltransferase action.
  • To investigate the role of enzyme conformational changes in substrate binding and catalysis.
  • To identify conserved features responsible for sugar donor specificity.

Main Methods:

  • Structural studies of glycosyltransferases.
  • Analysis of enzyme conformations in the presence and absence of substrates.

Related Experiment Videos

  • Comparative analysis of enzyme active sites across different species.

    • Main Results:

    • Flexible loops at the enzyme's substrate-binding site undergo a significant conformational change (open to closed) upon donor substrate binding.
    • This loop movement creates a specific acceptor-binding site, acting as a lid to cover the donor substrate.
    • Conserved residues within the sugar-nucleotide-binding pocket determine sugar donor specificity.

    Conclusions:

    • Glycosyltransferases employ a dynamic 'lid' mechanism involving flexible loops for efficient and specific glycosylation.
    • This conformational flexibility is essential for sequential substrate binding, catalysis, and product release.
    • Conserved active site residues highlight evolutionary conservation of glycosylation pathways.