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
2007; Wiley; Volume: 274; Issue: 7 Linguagem: Inglês
10.1111/j.1742-4658.2007.05726.x
ISSN1742-4658
AutoresTara L. Pukala, Jason Doyle, Lyndon Llewellyn, Lucia Kuhn‐Nentwig, Margit A. Apponyi, Frances Separovic, John H. Bowie,
Tópico(s)Venomous Animal Envenomation and Studies
ResumoCupiennin 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.
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