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Cupiennin 1a, an antimicrobial peptide from the venom of the neotropical wandering spider Cupiennius salei , also inhibits the formation of nitric oxide by neuronal nitric oxide synthase
Author(s) -
Pukala Tara L.,
Doyle Jason R.,
Llewellyn Lyndon E.,
KuhnNentwig Lucia,
Apponyi Margit A.,
Separovic Frances,
Bowie John H.
Publication year - 2007
Publication title -
the febs journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.981
H-Index - 204
eISSN - 1742-4658
pISSN - 1742-464X
DOI - 10.1111/j.1742-4658.2007.05726.x
Subject(s) - nitric oxide , nitric oxide synthase , chemistry , calmodulin , biochemistry , biophysics , antimicrobial , peptide , biology , enzyme , organic chemistry
Cupiennin 1a (GFGALFKFLAKKVAKTVAKQAAKQGAKYVVNKQME‐NH 2 ) is a potent venom component of the spider Cupiennius salei. Cupiennin 1a shows multifaceted activity. In addition to known antimicrobial and cytolytic properties, cupiennin 1a inhibits the formation of nitric oxide by neuronal nitric oxide synthase at an IC 50 concentration of 1.3 ± 0.3 µ m . This is the first report of neuronal nitric oxide synthase inhibition by a component of a spider venom. The mechanism by which cupiennin 1a inhibits neuronal nitric oxide synthase involves complexation with the regulatory protein calcium calmodulin. This is demonstrated by chemical shift changes that occur in the heteronuclear single quantum coherence spectrum of 15 N‐labelled calcium calmodulin upon addition of cupiennin 1a. The NMR data indicate strong binding within a complex of 1 : 1 stoichiometry.