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Glycobiology Advance Access published online on August 17, 2007
Glycobiology, doi:10.1093/glycob/cwm086
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© The Author 2007. Published by Oxford University Press. All rights reserved. For permissions, please e-mail: journals.permissions@oxfordjournals.org
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/2.0/uk/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

A ß-galactoside {alpha}2,6-sialyltransferase produced by a marine bacterium, Photobacterium leiognathi JT-SHIZ-145, is active at pH 8

Takeshi Yamamoto1,, Yoko Hamada, Masako Ichikawa, Hitomi Kajiwara, Toshiki Mine, Hiroshi Tsukamoto and Yoshimitsu Takakura

Glycotechnology Business Unit, JAPAN TOBACCO INC, 700 Higashibara, Iwata, Shizuoka 438-0802, JAPAN

1 To whom correspondence should be addressed: Tel: +81-538-32-7389; FAX: +81-538-33-6046 e-mail: akeshi.yamamoto{at}ims.jti.co.jp

Received on June 9, 2007; accepted on August 6, 2007

A gene encoding a sialyltransferase produced by Photobacterium leiognathi JT-SHIZ-145 was cloned, sequenced, and expressed in Escherichia coli. The sialyltransferase gene contained an open reading frame of 1494 base pairs encoding a predicted protein of 497 amino acid residues. The deduced amino acid sequence of the sialyltransferase had no significant similarity to mammalian sialyltransferases and did not contain sialyl motifs, but did show high homology to another marine bacterial sialyltransferase, a ß-galactoside {alpha}2,6-sialyltransferase produced by P. damselae JT0160. The acceptor substrate specificity of the new enzyme was similar to that of the {alpha}2,6-sialyltransferase from P. damselae JT0160, but its activity was maximal at pH 8. This property is quite different from the properties of all mammalian and bacterial sialyltransferases reported previously, which have maximal activity at acidic pH. In general, both sialosides and cytidine-5'-monophospho-N-acetylneuraminic acid, the common donor substrate of sialyltransferases, are more stable under basic conditions. Therefore, a sialyltransferase with an optimum pH in the basic range should be useful for the preparation of sialosides and the modification of glycoconjugates such as asialo-glycoproteins and asialo-glycolipids. Thus, the sialyltransferase obtained from P. leiognathi JT-SHIZ-145 is a promising tool for the efficient production of sialosides.

Key words: Genus Photobacterium / Marine bacterium / Sialyltransferase


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