Abstract:
:Trehalose synthase (TreS) catalyzes the reversible conversion of maltose into trehalose in mycobacteria as one of three biosynthetic pathways to this nonreducing disaccharide. Given the importance of trehalose to survival of mycobacteria, there has been considerable interest in understanding the enzymes involved in its production; indeed the structures of the key enzymes in the other two pathways have already been determined. Herein, we present the first structure of TreS from Mycobacterium smegmatis, thereby providing insights into the catalytic machinery involved in this intriguing intramolecular reaction. This structure, which is of interest both mechanistically and as a potential pharmaceutical target, reveals a narrow and enclosed active site pocket within which intramolecular substrate rearrangements can occur. We also present the structure of a complex of TreS with acarbose, revealing a hitherto unsuspected oligosaccharide-binding site within the C-terminal domain. This may well provide an anchor point for the association of TreS with glycogen, thereby enhancing its role in glycogen biosynthesis and degradation.
journal_name
Glycobiologyjournal_title
Glycobiologyauthors
Caner S,Nguyen N,Aguda A,Zhang R,Pan YT,Withers SG,Brayer GDdoi
10.1093/glycob/cwt044subject
Has Abstractpub_date
2013-09-01 00:00:00pages
1075-83issue
9eissn
0959-6658issn
1460-2423pii
cwt044journal_volume
23pub_type
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