Inhibition of cholinesterase by acephate and methamidophos: evidence for the binding of acephate to a modulatory 'allosteric' site

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Abstract

The methamidophos-inactivated cholinesterase (ChE) was reactivated by dialysis, whereas, the acephate-inactivated ChE was not reactivated by dialysis. The acephate-inactivated ChE was also not reactivated by Pyridine-2-aldoxime methiodide (2-PAM). The kinetic properties of control-ChE were significantly different from the kinetic properties of the acephate-exposed- dialyzed ChE. However, the kinetic properties of control ChE were similar to the kinetic properties of the methamidophos-exposed-dialyzed ChE. It is proposed that acephate irreversibly binds to a peripheral 'allosteric' site in ChE and alters the kinetic properties of the ChE active sites.

Original languageEnglish (US)
Pages (from-to)727-728
Number of pages2
JournalMedical Science Research
Volume16
Issue number14
StatePublished - Jan 1 1988

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