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Molecules 2011, 16(8), 6396-6407; doi:10.3390/molecules16086396
Article

Substrate Promiscuity of N-Acetylhexosamine 1-Kinases

1
, 1
, 1
, 1
, 2
, 1,†, 1,‡, 1
, 1
, 2
 and 1,*
1 Department of Chemistry, University of California, One Shields Avenue, Davis, CA 95616, USA 2 Departments of Biochemistry and Chemistry, Ohio State University, Columbus, OH 43210, USA Current Address: National Glycoengineering Research Center, Shandong University, Jinan, Shandong 250012, China Current Address: Department of Chemistry, Faculty of Science, Banaras Hindu University, Varanasi, UP 221 005, India
* Author to whom correspondence should be addressed.
Received: 1 July 2011 / Revised: 22 July 2011 / Accepted: 25 July 2011 / Published: 28 July 2011
(This article belongs to the Special Issue Enzyme-Catalyzed Reactions)
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Abstract

N-Acetylhexosamine 1-kinase (NahK) catalyzes the direct addition of a phosphate from adenosine 5'-triphosphate (ATP) to the anomeric position of N-acetylhexosamine and shows similar activity towards N-acetylglucosamine (GlcNAc) and N-acetylgalactosamine (GalNAc). Herein we report the cloning, characterization, and substrate specificity studies of two NahKs from Bifidobacterium infantis ATCC15697 and Bifidobacterium longum ATCC55813, respectively. A new capillary electrophoresis assay method has been developed for enzyme activity assays. Both enzymes have a good expression level in E. coli (180–185 mg/L culture) and can tolerate diverse modifications at C2 of GlcNAc and GalNAc. Various GlcNAc derivatives with C6, both C2 and C6, as well as both C2 and C3 modifications are tolerable substrates for the newly cloned NahKs. Quite interestingly, despite of their low activities toward glucose and galactose, the activities of both NahKs are much higher for mannose and some of its C2, C4, and C6 derivatives. These NahKs are excellent catalysts for enzymatic and chemoenzymatic synthesis of carbohydrates.
Keywords: N-acetylgalactosamine; N-acetylglucosamine; N-acetylhexosamine 1-kinase; mannose; substrate specificity N-acetylgalactosamine; N-acetylglucosamine; N-acetylhexosamine 1-kinase; mannose; substrate specificity
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Li, Y.; Yu, H.; Chen, Y.; Lau, K.; Cai, L.; Cao, H.; Tiwari, V.K.; Qu, J.; Thon, V.; Wang, P.G.; Chen, X. Substrate Promiscuity of N-Acetylhexosamine 1-Kinases. Molecules 2011, 16, 6396-6407.

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