Trans-sialidase activity of Photobacterium damsela alpha2,6-sialyltransferase and its application in the synthesis of sialosides

Glycobiology. 2010 Feb;20(2):260-8. doi: 10.1093/glycob/cwp172. Epub 2009 Oct 30.

Abstract

Trans-sialidases catalyze the transfer of a sialic acid from one sialoside to an acceptor to form a new sialoside. alpha2,3-Trans-sialidase activity was initially discovered in the parasitic protozoan Trypanosoma cruzi, and more recently was found in a multifunctional Pasteurella multocida sialyltransferase PmST1. alpha2,8-Trans-sialidase activity was also described for a multifunctional Campylobacter jejuni sialyltransferase CstII. We report here the discovery of the alpha2,6-trans-sialidase activity of a previously reported recombinant truncated bacterial alpha2,6-sialyltransferase from Photobacterium damsela (Delta15Pd2,6ST). This is the first time that the alpha2,6-trans-sialidase activity has ever been identified. Kinetic studies indicate that Delta15Pd2,6ST-catalyzed trans-sialidase reaction follows a ping-pong bi-bi reaction mechanism. Cytidine 5'-monophosphate, the product of sialyltransferase reactions, is not required by the trans-sialidase activity of the enzyme but enhances the trans-sialidase activity modestly as a non-essential activator. Using chemically synthesized Neu5AcalphapNP and LacbetaMU, alpha2,6-linked sialoside Neu5Acalpha2,6LacbetaMU has been obtained in one-step in high yield using the trans-sialidase activity of Delta15Pd2,6ST. In addition to the alpha2,6-trans-sialidase activity, Delta15Pd2,6ST also has alpha2,6-sialidase activity. The multifunctionality is thus a common feature of many bacterial sialyltransferases.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Catalysis
  • Enzyme Activation
  • Glycoproteins / metabolism*
  • N-Acetylneuraminic Acid / biosynthesis*
  • N-Acetylneuraminic Acid / chemistry
  • Neuraminidase / metabolism*
  • Photobacterium / enzymology*
  • Sialyltransferases / metabolism*
  • beta-D-Galactoside alpha 2-6-Sialyltransferase

Substances

  • Glycoproteins
  • Sialyltransferases
  • trans-sialidase
  • Neuraminidase
  • N-Acetylneuraminic Acid
  • beta-D-Galactoside alpha 2-6-Sialyltransferase