Molecular Dynamics of the Interaction of Pralidoxime and Deazapralidoxime with Acetylcholinesterase Inhibited by the Neurotoxic Agent Tabun

نویسندگان

  • Arlan da S. Gonçalves
  • Tanos C. C. França
  • Alan Wilter
  • José D. Figueroa-Villar
چکیده

Reativadores eficientes de Aceticolinesterase são fundamentais para o desenvolvimento de antídotos contra o envenenamento por pesticidas neurotóxicos e agentes de guerra química. Todavia, o mecanismo da reação de reativação e as características estruturais dos reativadores conhecidos são pouco compreendidos. Com o objetivo de estudar o comportamento dinâmico e o efeito da carga líquida do antídoto na reativação desta enzima, foi conduzido um estudo por dinâmica molecular da acetilcolinesterase humana inibida por tabun em complexo com o antídoto pralidoxima e com seu análogo deazapralidoxima nas formas neutra e aniônica. Os resultados mostraram que a carga positiva da pralidoxima é importrante para sua admissão e permanência dentro do sítio ativo. Além disso, os análogos, diferente da pralidoxima, quando colocados dentro do sítio ativo, se distanciam do resíduo serina fosforilado da enzima e são repelidos pelo potencial eletrostático na entrada do canal que conduz ao sítio ativo.

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تاریخ انتشار 2006