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Azetidine-2,4-diones (4-oxo-beta-lactams) as scaffolds for designing elastase inhibitors

Mulchande, J.; Guedes, R. C.; Tsang, W.-Y.; Page, M. I.; Moreira, R. and Iley, J. (2008). Azetidine-2,4-diones (4-oxo-beta-lactams) as scaffolds for designing elastase inhibitors. Journal of Medicinal Chemistry, 51(6) pp. 1783–1790.

URL: http://pubs.acs.org/cgi-bin/abstract.cgi/jmcmar/20...
DOI (Digital Object Identifier) Link: http://dx.doi.org/10.1021/jm701257h
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Abstract

A new class of inhibitors 4-oxo-β-lactams (azetidine-2,4-diones), containing the required structural elements for molecular recognition, inhibit porcine pancreatic elastase (PPE) but show a dramatically lower reactivity toward hydroxide compared with the analogous inhibitors 3-oxo-β-sultams. Inhibition is the result of acylation of the active site serine and electron-withdrawing substituents at the N-(4-aryl) position in 3,3-diethyl-N-aryl derivatives increasing the rate of enzyme acylation and generating a Hammett ρ-value of 0.65. Compared with a ρ-value of 0.96 for the rates of alkaline hydrolysis of the same series, this is indicative of an earlier transition state for the enzyme-catalyzed reaction. Docking studies indicate favorable noncovalent interactions of the inhibitor with the enzyme. Compound 2i, the most potent inhibitor against PPE, emerged as a very potent HLE inhibitor, with a second-order rate for enzyme inactivation of ~5 × 105 M−1 s−1.

Item Type: Journal Article
ISSN: 0022-2623
Keywords: elastase; beta-lactams; beta-lactim; imides; PPE; HLE
Academic Unit/Department: Science > Life, Health and Chemical Sciences
Item ID: 10817
Depositing User: James Iley
Date Deposited: 13 Jun 2008
Last Modified: 02 Dec 2010 20:08
URI: http://oro.open.ac.uk/id/eprint/10817
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