Title : Differential inhibition of soluble and membrane-bound acetylcholinesterase forms from mouse brain by choline esters with an acyl moiety of an intermediate size - Cho_1994_Neurochem.Res_19_799 |
Author(s) : Cho Y , Cha SH , Sok DE |
Ref : Neurochem Res , 19 :799 , 1994 |
Abstract :
Differential inhibitions of soluble and membrane-bound acetylcholinesterase forms purified from mouse brain were examined by the comparison of kinetic constants such as a Km value, a Kss value (substrate inhibition constant), and IC50 values of active site-selective ligands including choline esters. Membrane-bound acetylcholinesterase form (solubilized only in the presence of detergent) showed lower Km and Kss values than soluble acetylcholinesterase form (easily solubilized without detergent). Edrophonium expressed a slightly but significantly (p < 0.01) higher inhibition of detergent-soluble acetylcholinesterase form than aqueous-soluble acetylcholinesterase form, while physostigmine inhibited both forms with a similar potency. A remarkable difference in inhibition was observed using choline esters; although choline esters with acyl chain of a short size (acetyl- to butyrylcholine) or a long size (heptanoyl- to decanoylcholine) showed a similar inhibitory potency for two forms of acetylcholinesterase, pentanoylcholine and hexanoylcholine inhibited more strongly aqueous-soluble acetylcholinesterase than detergent-soluble acetylcholinesterase. Thus, it is suggested that the two forms of AChE may be distinguished kinetically by pentanoyl- or hexanoylcholine. |
PubMedSearch : Cho_1994_Neurochem.Res_19_799 |
PubMedID: 7969748 |
Cho Y, Cha SH, Sok DE (1994)
Differential inhibition of soluble and membrane-bound acetylcholinesterase forms from mouse brain by choline esters with an acyl moiety of an intermediate size
Neurochem Res
19 :799
Cho Y, Cha SH, Sok DE (1994)
Neurochem Res
19 :799