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Rationalization of the inhibition activity of structurally related organometallic compounds against the drug target cathepsin B by DFT

Casini, Angela, Edafe, Fabio, Erlandsson, Mikael, Gonsalvi, Luca, Ciancetta, Antonella, Re, Nazzareno, Ienco, Andrea, Messori, Luigi, Peruzzini, Maurizio and Dyson, Paul J. 2010. Rationalization of the inhibition activity of structurally related organometallic compounds against the drug target cathepsin B by DFT. Dalton Transactions 39 (23) , pp. 5556-5563. 10.1039/C003218B

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Abstract

A series of organometallic compounds of general formula [(arene)M(PTA)nXm]Y (arene = η6-C10H14, η-C5Me5); M = Ru(II), Os(II), Rh(III) and Ir(III); X = Cl, mPTA; Y = OTf, PF6) have been screened for their cytotoxicity and ability to inhibit cathepsin B in vitro, in comparison to the antimetastatic compound NAMI-A. The Ru and Os analogues and NAMI-A showed similar enzyme inhibition properties (with IC50 values in the low μM range), whereas the Rh(III) and Ir(III) compounds were inactive. In order to build up a rational for the observed differences, DFT calculations of the metal complexes adducts with N-acetyl-L-cysteine-N′-methylamide, a mimic for the Cys residue in the cathepsin B active site, were performed to provide insights into binding thermodynamics in solution. Initial structure–activity relationships have been defined with the calculated binding energies of the M–S bonds correlating well with the observed inhibition properties of the compounds.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Subjects: Q Science > QD Chemistry
Publisher: Royal Society of Chemistry
Date of Acceptance: 19 April 2010
Last Modified: 04 Jun 2017 08:30
URI: http://orca.cf.ac.uk/id/eprint/79341

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