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Structure—activity relationships for in vitro oxime reactivation of chlorpyrifos-inhibited acetylcholinesterase

K. Kuča, V. Račáková, and D. Jun

Centre of Advanced Studies, University of Defence, 500 01 Hradec Králové, Czech Republic



Received: 27 July 2006  Revised: 7 March 2007  Accepted: 15 March 2007

Abstract: Organophosphorus pesticides parathion, chlorpyrifos, and malathion inhibit the enzyme acetylcholinesterase (AChE; EC via phosphorylation of its active site. AChE reactivators and anticholinergics are compounds used as antidotes in the case of intoxication by these AChE inhibitors. In this work, chlorpyrifos, a representative member of this pesticide family, was used to inhibit the AChE activity of rat brain. The effect of twenty-one structurally different AChE reactivators was tested in vitro and subsequently, the relationship between their chemical structure and biological activity was outlined.

Keywords: acetylcholinesterase - reactivators - structure—activity relationship - pesticide - organophosphates

Full paper is available at

DOI: 10.2478/s11696-007-0030-7


Chemical Papers 61 (4) 256–261 (2007)

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