Enzymatic and biochemical characterization of Bungarus sindanus snake venom acetylcholinesterase
J. venom. anim. toxins incl. trop. dis
; 18(2): 236-243, 2012. graf, tab
Artigo
em Inglês
| LILACS, VETINDEX
| ID: lil-639483
Biblioteca responsável:
BR68.1
ABSTRACT
This study analyses venom from the elapid krait snake Bungarus sindanus, which contains a high level of acetylcholinesterase (AChE) activity. The enzyme showed optimum activity at alkaline pH (8.5) and 45ºC. Krait venom AChE was inhibited by substrate. Inhibition was significantly reduced by using a high ionic strength buffer; low ionic strength buffer (10 mM PO4 pH 7.5) inhibited the enzyme by 1. 5mM AcSCh, while high ionic strength buffer (62 mM PO4 pH 7.5) inhibited it by 1 mM AcSCh. Venom acetylcholinesterase was also found to be thermally stable at 45ºC; it only lost 5% of its activity after incubation at 45ºC for 40 minutes. The Michaelis-Menten constant (Km) for acetylthiocholine iodide hydrolysis was found to be 0.068 mM. Krait venom acetylcholinesterase was also inhibited by ZnCl2, CdCl2, and HgCl2 in a concentrationdependent manner. Due to the elevated levels of AChE with high catalytic activity and because it is more stable than any other sources, Bungarus sindanus venom is highly valuable for biochemical studies of this enzyme.(AU)
Texto completo:
Disponível
Base de dados:
LILACS
/
VETINDEX
Assunto principal:
Acetilcolinesterase
/
Acetiltiocolina
/
Venenos de Serpentes
/
Bungarus
/
Enzimas
Limite:
Animais
Idioma:
Inglês
Revista:
J. venom. anim. toxins incl. trop. dis
Ano de publicação:
2012
Tipo de documento:
Artigo
Instituição/País de afiliação:
Federal University of Santa Maria/BR
/
University of Science and Technology/PK