The 2,4,6-trimethylpyridinium derivative of histamine is an effective activator of the zinc enzyme carbonic anhydrase (CA, EC 4.2.1.1). However, unlike other CA activators, which bind at the entrance of the active site cavity, an X-ray crystal structure of hCA II in complex with the 1-[2-(1H-imidazol-4-yl)-ethyl]-2,4,6-trimethylpyridinium salt evidenced a binding mode never observed before either for activators or inhibitors of this enzyme, with the 2,4,6-trimethylpyridinium ring pointing towards the metal ion deep within the enzyme cavity, and several strong hydrophobic interactions stabilizing the adduct. Indeed, incubation of the activator with the enzyme for several days leads to potent inhibitory effects. This is the first example of a CA activator which after a longer contact with the enzyme behaves as an inhibitor.

An inhibitor-like binding mode of a carbonic anhydrase activator within the active site of isoform II / K. Dave;M. A. Ilies;A. Scozzafava;C. Temperini;D. Vullo;C. T. Supuran. - In: BIOORGANIC & MEDICINAL CHEMISTRY LETTERS. - ISSN 0960-894X. - STAMPA. - 21:(2011), pp. 2764-2768. [10.1016/j.bmcl.2010.10.045]

An inhibitor-like binding mode of a carbonic anhydrase activator within the active site of isoform II.

SCOZZAFAVA, ANDREA;VULLO, DANIELA;SUPURAN, CLAUDIU TRANDAFIR
2011

Abstract

The 2,4,6-trimethylpyridinium derivative of histamine is an effective activator of the zinc enzyme carbonic anhydrase (CA, EC 4.2.1.1). However, unlike other CA activators, which bind at the entrance of the active site cavity, an X-ray crystal structure of hCA II in complex with the 1-[2-(1H-imidazol-4-yl)-ethyl]-2,4,6-trimethylpyridinium salt evidenced a binding mode never observed before either for activators or inhibitors of this enzyme, with the 2,4,6-trimethylpyridinium ring pointing towards the metal ion deep within the enzyme cavity, and several strong hydrophobic interactions stabilizing the adduct. Indeed, incubation of the activator with the enzyme for several days leads to potent inhibitory effects. This is the first example of a CA activator which after a longer contact with the enzyme behaves as an inhibitor.
2011
21
2764
2768
K. Dave;M. A. Ilies;A. Scozzafava;C. Temperini;D. Vullo;C. T. Supuran
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/776249
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