Journal
CARBOHYDRATE RESEARCH
Volume 342, Issue 12-13, Pages 1741-1772Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carres.2007.05.001
Keywords
cell-wall biosynthesis; mycobacteria; mannosyltransferase; synthesis; deoxy analogs; methoxy analogs; lipoarabinomannan
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A panel of analogs of the disaccharide alpha-D-Manp-(1 -> 6)-alpha-D-Manp-OOctyl, a known acceptor substrate for a polyprenol monophosphomannose-dependent alpha-(1 -> 6)-mannosyltransferase involved in the assembly of the alpha-(1 -> 6)-linked mannan core of mycobacterial lipoarabinomannan, has been synthesized. Described are synthetic routes to the target deoxy and methoxy analogs in which one of the hydroxyl groups Of the parent disaccharide has been modified. All glycosylation reactions involved the use of octyl glycoside acceptors and thioglycoside donors using iodonium-ion activation, and the stereochemistry of the mannopyranoside bond formed was established by measurement of the (1)J(C-1.H-1). Depending on the target, the key methylation or deoxygenation reactions were carried out on either mono- or disaccharide substrates. This series of analogs will be useful for probing the substrate specificity of the enzyme, in particular, its steric and hydrogen-bonding requirements. (c) 2007 Elsevier Ltd. All rights reserved.
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