http://www.cnr.it/ontology/cnr/individuo/prodotto/ID168560
A substrate-induced switch in the reaction mechanism of a thermophilic esterase. Kinetic evidences and structutal basis (Articolo in rivista)
- Type
- Label
- A substrate-induced switch in the reaction mechanism of a thermophilic esterase. Kinetic evidences and structutal basis (Articolo in rivista) (literal)
- Anno
- 2004-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.1074/jbc.M307738200 (literal)
- Alternative label
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- De Simone G.; Mandrich L.; Menchise V.; Giordano V.; Febbraio F.; Rossi M.; Pedone C.; Manco G. (literal)
- Pagina inizio
- Pagina fine
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
- Rivista
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
- Note
- ISI Web of Science (WOS) (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
- Istituto di Biostrutture e Bioimmagini-Consiglio Nazionale delle Ricerche, via Mezzocannone 6,
80134 Naples, Italy and the Istituto di Biochimica delle Proteine-Consiglio Nazionale delle Ricerche,
Via P. Castellino 111, 80131 Naples, Italy (literal)
- Titolo
- A substrate-induced switch in the reaction mechanism of a thermophilic esterase. Kinetic evidences and structutal basis (literal)
- Abstract
- The reaction mechanism of the esterase 2 (EST2) from Alicyclobacillus acidocaldarius was studied at the kinetic and structural level to shed light on the mechanism of activity and substrate specificity increase previously observed in its double mutant M211S/R215L. In particular, the values of kinetic constants (k1, k(-1), k2, and k3) along with activation energies (E1, E(-1), E2, and E3) were measured for wild type and mutant enzyme. The previously suggested substrate-induced switch in the reaction mechanism from kcat=k3 with a short acyl chain substrate (p-nitrophenyl hexanoate) to kcat=k2 with a long acyl chain substrate (p-nitrophenyl dodecanoate) was validated. The inhibition afforded by an irreversible inhibitor (1-hexadecanesulfonyl chloride), structurally related to p-nitrophenyl dodecanoate, was studied by kinetic analysis. Moreover the three-dimensional structure of the double mutant bound to this inhibitor was determined, providing essential information on the enzyme mechanism. In fact, structural analysis explained the observed substrate-induced switch because of an inversion in the binding mode of the long acyl chain derivatives with respect to the acyl- and alcohol-binding sites. (literal)
- Prodotto di
- Autore CNR
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