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  • Inhibition and protection of cholinesterases by methanol and ethanol
    Fekonja, Ota ...
    The cholinesterases have been investigated in terms of the effects of methanoland ethanol on substrate and carbamate turnover; and on their phosphorylation. It was found: 1) that at low substrate ... concentrations the twoalcohols inhibit all three tested cholinesterases and that the optimum activities are shifted towards higher substrate concentrations, but with a weak effect on horse butyrylcholinesterase; 2) that methanol slows down carbamoylation by eserine and does not influence decarbamoylation of vertebrate and insect acetylcholinesterase and 3) that ethanol decreases the rate of phosphorylation of vertebrate acetylcholinesterase by DFP. Our resultsare in line with the so-called `approach-and-exit' hypothesis. By hindering the approach of substrate and the exit of products, methanol and ethanol decrease cholinesterase activity at low substrate concentrations and allow for the substrate inhibition only at higher substrate concentrations. Both effects appears to be a consequence of the lower ability of substrate to substitute alcohol rather than water. It also seems that during substrate turnover in the presence of alcohol the transacetylation is negligible.
    Vir: Journal of enzyme inhibition and medicinal chemistry. - ISSN 1475-6366 (Letn. 22, št. 4, 2007, str. 407-415)
    Vrsta gradiva - članek, sestavni del
    Leto - 2007
    Jezik - angleški
    COBISS.SI-ID - 23064281

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