[How thione phosphonates inhibit activities of various cholinesterases]

Abstract

Analysis of mechanism of reversible inhibition of human erythrocyte acetylcholinesterase (AChE), of horse serum cholinesterase (ChE), and ChE of optical ganglia tissue of individuals of the Commander squid Berryleuthis magister from various habitat zones was studied under effect thionphosphonates (P=S), derivatives of piperidine, morpholine, perhydroazepine as well as several heterocyclic model compounds. Data of comparative inhibitory specificity have allowed us to suggest that thionphosphonates are sorbed in the area of cholinesterase esterase center at the expense of phosphoryl part of the inhibitor molecule, rather than of its heterocyclic grouping. An advantage in the antienzyme efficiency of thionphosphonates (P=S) over phosphonates (P=O) is revealed. The ion strength effect is used for analysis of contribution of the hydrophobichydrophilic interaction in the enzyme-inhibitor system.