Protein Science
Protein Science
5 years ago

Crystal structure of a marine glycoside hydrolase family 99 related protein lacking catalytic machinery

Agata Anna Mystkowska, Jan-Hendrik Hehemann, Craig S. Robb
Algal polysaccharides of diverse structures are one of the most abundant carbon resources for heterotrophic, marine bacteria with coevolved digestive enzymes. A putative sulfo-mannan polysaccharide utilization locus, which is conserved in marine Flavobacteriia, contains an unusual GH99-like protein that lacks the conserved catalytic residues of glycoside hydrolase family 99. Using X-ray crystallography, we structurally characterized this protein from the marine Flavobacterium Ochrovirga pacifica to help elucidate its molecular function. The structure reveals the absence of potential catalytic residues for polysaccharide hydrolysis, which, together with additional structural features, suggests this protein may be non-catalytic and involved in carbohydrate binding. This article is protected by copyright. All rights reserved.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/pro.3291

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