Conformational Behaviour of Azasugars Based on Mannuronic Acid.

Autor: van Rijssel ER; Leiden Institute of Chemistry, Leiden University, Einsteinweg 55, 2333 CC, Leiden, The Netherlands., Janssen APA; Leiden Institute of Chemistry, Leiden University, Einsteinweg 55, 2333 CC, Leiden, The Netherlands., Males A; York Structural Biology Laboratory, Department of Chemistry, The University of York, York, YO10 5DD, UK., Davies GJ; York Structural Biology Laboratory, Department of Chemistry, The University of York, York, YO10 5DD, UK., van der Marel GA; Leiden Institute of Chemistry, Leiden University, Einsteinweg 55, 2333 CC, Leiden, The Netherlands., Overkleeft HS; Leiden Institute of Chemistry, Leiden University, Einsteinweg 55, 2333 CC, Leiden, The Netherlands., Codée JDC; Leiden Institute of Chemistry, Leiden University, Einsteinweg 55, 2333 CC, Leiden, The Netherlands.
Jazyk: angličtina
Zdroj: Chembiochem : a European journal of chemical biology [Chembiochem] 2017 Jul 04; Vol. 18 (13), pp. 1297-1304. Date of Electronic Publication: 2017 Apr 18.
DOI: 10.1002/cbic.201700080
Abstrakt: A set of mannuronic-acid-based iminosugars, consisting of the C-5-carboxylic acid, methyl ester and amide analogues of 1deoxymannorjirimicin (DMJ), was synthesised and their pH-dependent conformational behaviour was studied. Under acidic conditions the methyl ester and the carboxylic acid adopted an "inverted" 1 C 4 chair conformation as opposed to the "normal" 4 C 1 chair at basic pH. This conformational change is explained in terms of the stereoelectronic effects of the ring substituents and it parallels the behaviour of the mannuronic acid ester oxocarbenium ion. Because of this solution-phase behaviour, the mannuronic acid ester azasugar was examined as an inhibitor for a Caulobacter GH47 mannosidase that hydrolyses its substrates by way of a reaction itinerary that proceeds through a 3 H 4 transition state. No binding was observed for the mannuronic acid ester azasugar, but sub-atomic resolution data were obtained for the DMJ⋅CkGH47 complex, showing two conformations- 3 S 1 and 1 C 4 -for the DMJ inhibitor.
(© 2017 The Authors. Published by Wiley-VCH Verlag GmbH & Co. KGaA.)
Databáze: MEDLINE
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