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
  • De Simone G.; Mandrich L.; Menchise V.; Giordano V.; Febbraio F.; Rossi M.; Pedone C.; Manco G. (2004)
    A substrate-induced switch in the reaction mechanism of a thermophilic esterase. Kinetic evidences and structutal basis
    in Journal of biological chemistry (Online)
    (literal)
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
  • 6815 (literal)
Pagina fine
  • 6823 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 279 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
  • 8 (literal)
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)
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