Synthesis of deoxy and methoxy analogs of octyl α-d-mannopyranosyl-(1→6)-α-d-mannopyranoside as probes for mycobacterial lipoarabinomannan biosynthesis
- 作者：Pui-Hang Tam ; Todd L. Lowary
- 关键词：Cell-wall biosynthesis ; Mycobacteria ; Mannosyltransferase ; Synthesis ; Deoxy analogs ; Methoxy analogs ; Lipoarabinomannan
- 刊名：Carbohydrate Research
- 出版年：2007
- 期刊代码：15_00086215
- 类别：ch
- 出版时间：3 September 2007
- 卷：342
- 期：12-13
- 页码：1741-1772
- 文件大小：542 K
摘要
A panel of analogs of the disaccharide α-d-Manp-(1→6)-α-d-Manp-OOctyl, a known acceptor substrate for a polyprenol monophosphomannose-dependent α-(1→6)-mannosyltransferase involved in the assembly of the α-(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 1JC-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.