title: Mechanism-based inhibitors and other active-site targeted inhibitors of oxidosqualene cyclase and squalene cyclase.
abstract: Enzymatic cyclizations of squalene and oxidosqualene lead to sterols and other triterpenoids in bacteria, fungi, plants, and animals. The cyclases for these reactions catalyze formation and stabilization of polycyclic carbocations and direct the enzyme-specific, templated formation of new carbon-carbon bonds in regio- and stereochemically defined contexts. The development of mechanism-based irreversible inhibitors, photoactivatable inhibitors, and numerous substrate analogs have helped to unravel the stepwise events occurring in the catalytic sites of these enzymes by covalent modification of specific amino acid residues.
authors.affiliation: Department of Medicinal Chemistry, University of Utah, Salt Lake City 84112-5820, USA.
authors.forename: I
authors.initials: I
authors.lastname: Abe
authors.forename: Y F
authors.initials: YF
authors.lastname: Zheng
authors.forename: G D
authors.initials: GD
authors.lastname: Prestwich
mesh_terms: D000818:Animals; D001665:Binding Sites; D004791:Enzyme Inhibitors / Q000494:pharmacology*; D019751:Intramolecular Transferases / Q000037:antagonists & inhibitors* / Q000378:metabolism; D007700:Kinetics; D008190:Lyases / Q000037:antagonists & inhibitors* / Q000378:metabolism; D013237:Stereoisomerism
chemical_list: D004791:Enzyme Inhibitors; D008190:Lyases; C022651:squalene cyclase; D019751:Intramolecular Transferases; C021924:lanosterol synthase