title: The first example of a significant active site conformational rearrangement in a carbonic anhydrase-inhibitor adduct: the carbonic anhydrase I-topiramate complex.
abstract: Topiramate is a widely used antiepileptic drug, which has been demonstrated to act as an efficient weight loss agent. Since several studies have pointed out that is a potent in vitro inhibitor of several Carbonic anhydrase (CA) isozymes, it has been hypothesized that its anti-obesity properties could be ascribed to the inhibition of the CAs involved in de novo lipogenesis. Consequently, the study of the interactions of with all human CA isoforms represents an important step for the rational drug design of selective CA inhibitors to be used as anti-obesity drugs. In this paper we report the crystallographic structure of the adduct that forms with hCA I, showing for the first time a profound reorganization of the CA active site upon binding of the inhibitor. Moreover, a structural comparison with hCA II- and hCA VA- adducts, previously investigated, has been performed showing that a different H-bond network together with the movement of some amino acid residues in the active site may account for the different inhibition constants of toward these three CA isozymes.
authors.affiliation: Istituto di Biostrutture e Bioimmagini-CNR, via Mezzocannone 16, 80134 Naples, Italy.
authors.forename: Vincenzo
authors.initials: V
authors.lastname: Alterio
authors.forename: Simona Maria
authors.initials: SM
authors.lastname: Monti
authors.forename: Emanuela
authors.initials: E
authors.lastname: Truppo
authors.forename: Carlo
authors.initials: C
authors.lastname: Pedone
authors.forename: Claudiu T
authors.initials: CT
authors.lastname: Supuran
authors.forename: Giuseppina
authors.initials: G
authors.lastname: De Simone
mesh_terms: D000595:Amino Acid Sequence; D024401:Carbonic Anhydrase I / Q000037:antagonists & inhibitors / Q000737:chemistry* / Q000378:metabolism*; D002257:Carbonic Anhydrase Inhibitors / Q000737:chemistry / Q000378:metabolism* / Q000494:pharmacology*; D020134:Catalytic Domain; D018360:Crystallography, X-Ray; D005632:Fructose / Q000031:analogs & derivatives* / Q000737:chemistry / Q000378:metabolism / Q000494:pharmacology; D006801:Humans; D007527:Isoenzymes / Q000037:antagonists & inhibitors / Q000737:chemistry / Q000378:metabolism; D008958:Models, Molecular; D008969:Molecular Sequence Data; D011485:Protein Binding; D000077236:Topiramate
chemical_list: D002257:Carbonic Anhydrase Inhibitors; D007527:Isoenzymes; D000077236:Topiramate; D005632:Fructose; D024401:Carbonic Anhydrase I