Abstract

Inhibitory effects of 35 2-furylethylenes, non-specific alkylating agents, on glycolysis in a respiratory mutant of Saccharomyces cerevisiae were correlated with their 1-octanol/water partition coefficients and the rate constants for reaction with 2-mercaptoacetic acid using physiologically based models. The simplest model explaining the data satisfactorily consists of two-step drug-receptor interaction involving reversible formation of a structurally non-specific non-covalent complex stabilized later covalently. The concentration of the free drug in the receptor surroundings was related to its initial concentration in external medium via a simple form of a disposition function constructed on the basis of time hierarchy of passive membrane transport, non-covalent binding to cell constituents and metabolic inactivation of the drug.

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