Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 445531
Title Structural and functional evidence for two separate oligosaccharide binding sites of Pasteurellamultocida hyaluronan synthase
Author(s) Kooy, F.K.; Beeftink, H.H.; Eppink, M.H.M.; Tramper, J.; Eggink, G.; Boeriu, C.G.
Source Advances in Enzyme Research 1 (2013)4. - ISSN 2328-4846 - p. 97 - 111.
Department(s) Bioprocess Engineering
BBP Sustainable Chemistry & Technology
Publication type Refereed Article in a scientific journal
Publication year 2013
Abstract Pasteurella multocida hyaluronan synthase (PmHAS) is a bi-functional glycosyltransferase, containing a ß1,3-glucuronyltransferase and ß1,4-N-acetylglucosaminetransferase domain. PmHAS catalyzes the elongation of hyaluronan (HA) through the sequential addition of single monosaccharides to the non-reducing end of the hyaluronan chain. Research is focused on the relation between the length of the HA oligo- saccharide and the single-step elongation ki- netics from HA4 up to HA9. It was found that the turnover number kcat increased with length to maximum values of 11 and 14 s-1 for NAc- and UA-transfer, respectively. Interestingly, the spe- cificity constant kcat/KM increased with polymer length from HA5 to HA7 to a value of 44 mM-1·s-1, indicating an oligosaccharide binding site with increasing specificity towards a heptasaccha- ride at the UA domain. The value of kcat/KM re- mained moderately constant around 8 mM-1·s-1 for HA4, HA6, and HA8, indicating a binding site with significantly lower binding specificity at the NAc domain than at the UA domain. These find- ings are further corroborated by a structural homology model of PmHAS, revealing two dis- tinct sites for binding of oligosaccharides of different sizes, one in each transferase domain. Structural alignment studies between PmHAS and glycosyltransferases of the GT-A fold showed significant similarity in the binding of the UDP-sugars and the orientation of the ac- ceptor substrate. These similarities in substrate orientation in the active site and in essential amino acid residues involved in substrate bind- ing were utilized to localize the two HA oligo- saccharide binding sites.
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