Inhibition of naringinase (L-rhamnosidase) by piperidine analogues of L-rhamnose: Scaffolds for libraries incorporating trihydroxypipecolic acids
作者:John P. Shilvock、Joseph R. Wheatley、Benjamin Davis、Robert J. Nash、Rhodri C. Griffiths、M.George Jones、Matthias Müller、Sarah Crook、David J. Watkin、Colin Smith、Gurdyal S. Besra、Patrick J. Brennan、George W.J. Fleet
DOI:10.1016/0040-4039(96)01958-2
日期:1996.11
L-Deoxyrhamnojirimycin 1 does not inhibit naringinase significantly but 5-epi-L-deoxyrhamnojirimycin 2 is a potent inhibitor. Conversely, α-C-glycosides of 1 are good inhibitors of L-rhamnosidase whereas those of 2 are not. Intermediate azabicyclic lactones are likely to be of use for the incorporation of a number of trihydroxypipecolicacids into peptide libraries.
5-epi-Deoxyrhamnojirimycin is a potent inhibitor of an α-l-rhamnosidase: 5-epi-deoxymannojirimycin is not a potent inhibitor of an α-d-mannosidase
作者:Benjamin G. Davis、Andrew Hull、Colin Smith、Robert J. Nash、Alison A. Watson、David A. Winkler、Rhodri C. Griffiths、George W.J. Fleet
DOI:10.1016/s0957-4166(98)00317-6
日期:1998.8
Whereas deoxyrhamnojirimycin (LRJ) 1 shows no significant inhibition of naringinase (an alpha-L-rhamnosidase), its C-5 epimer 2 is a potent and specific inhibitor of the enzyme and demonstrates the value of unambiguous chemical synthesis of such materials in the evaluation of their biological properties. In contrast, moderately weak inhibition towards an alpha-D-mannosidase is shown by both deoxymannojirimycin (DMJ) 5 and its C-5 epimer 6. Mimics of L-rhamnose which are recognised by enzymes that synthesise or process L-rhamnose may inhibit el ther the biosynthesis of the sugar or its incorporation into mycobacterial cell walls, providing new strategies for the treatment of diseases such as tuberculosis and leprosy. Molecular modelling studies provide a rationale for the surprisingly potent activity of the C-S epimer 2 compared with LRJ 1 and support a general hypothesis that potent piperidine glycosidase inhibitors mimic the H-4(3) conformation Of the relevant glycopyranosyl cation intermediate. (C) 1998 Elsevier Science Ltd. All rights reserved.