Insights Into Trehalose Synthesis Provided by the Structure of the Retaining Glycosyltransferase OtsaGibson, R.P., Turkenburg, J.P., Charnock, S.J., Lloyd, R., Davies, G.J.
(2002) Chem.Biol. 9: 1337
- PubMed: 12498887
- Also Cited By: 1UQU, 1UQT
- PubMed Abstract:
- Characterization of Escherichia Coli Otsa, a Trehalose-6-Phosphate Synthase from Glycosyltransferase Family 20
Gibson, R.P.,Lloyd, R.M.,Charnock, S.J.,Davies, G.J.
(2002) Acta Crystallogr.,Sect.D 58: 349
Trehalose is a nonreducing disaccharide that plays a major role in many organisms, most notably in survival and stress responses. In Mycobacterium tuberculosis, it plays a central role as the carbohydrate core of numerous immunogenic glycolipids incl ...
Trehalose is a nonreducing disaccharide that plays a major role in many organisms, most notably in survival and stress responses. In Mycobacterium tuberculosis, it plays a central role as the carbohydrate core of numerous immunogenic glycolipids including "cord factor" (trehalose 6,6'-dimycolate). The classical pathway for trehalose synthesis involves the condensation of UDP-glucose and glucose-6-phosphate to afford trehalose-6-phosphate, catalyzed by the retaining glycosyltransferase OtsA. The configurations of two anomeric positions are set simultaneously, resulting in the formation of a double glycoside. The three-dimensional structure of the Escherichia coli OtsA, in complex with both UDP and glucose-6-phosphate, reveals the active site at the interface of two beta/alpha/beta domains. The overall structure and the intimate details of the catalytic machinery reveal a striking similarity to glycogen phosphorylase, indicating a strong evolutionary link and suggesting a common catalytic mechanism.
Department of Chemistry, The University of York, York YO10 5YW, Heslington, United Kingdom.