Temocapril is a prodrug whose hydrolysis by carboxylesterase 1 (CES1) yields the active ACE inhibitor temocaprilat. This molecular-dynamics (MD) study uses a resolved structure of the human CES1 (hCES1) to investigate some mechanistic details of temocapril hydrolysis. The ionization constants of temocapril (pK1 and pK3) and temocaprilat (pK1, pK2, and pK3) were determined experimentally and computationally using commercial algorithms. The constants so obtained were in good agreement and revealed that temocapril exists mainly in three ionic forms (a cation, a zwitterion, and an anion), whereas temocaprilat exists in four major ionic forms (a cation, a zwitterion, an anion, and a dianion). All these ionic forms were used as ligands in 5-ns MS simulations. While the cationic and zwitterionic forms of temocapril were involved in an ion-pair bond with Glu255 suggestive of an inhibitor behavior, the anionic form remained in a productive interaction with the catalytic center. As for temocaprilat, its cation appeared trapped by Glu255, while its zwitterion and anion made a slow departure from the catalytic site and a partial egress from the protein. Only its dianion was effectively removed from the catalytic site and attracted to the protein surface by Lys residues. A detailed mechanism of product egress emerges from the simulations.
Influence of ionization state on the activation of temocapril by hCES1: a molecular-dynamics study / G. Vistoli, A. Pedretti, A. Mazzolari, C. Bolchi, B. Testa. - In: CHEMISTRY & BIODIVERSITY. - ISSN 1612-1872. - 6:11(2009), pp. 2092-2100. ((Intervento presentato al 4. convegno LogP Symposium focused on PhysChem and ADMET Profiling in Drug Research tenutosi a Zurigo nel 2009.
|Titolo:||Influence of ionization state on the activation of temocapril by hCES1: a molecular-dynamics study|
|Settore Scientifico Disciplinare:||Settore CHIM/08 - Chimica Farmaceutica|
|Data di pubblicazione:||2009|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1002/cbdv.200900174|
|Appare nelle tipologie:||01 - Articolo su periodico|