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KMID : 0380219940270040308
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Journal of Biochemistry and Molecular Biology
1994 Volume.27 No. 4 p.308 ~ p.312
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Effects of Nonionic Surfactants on the Solubilization and Stability of Mouse Brain Acetylcholinesterase
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Abstract
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Abstract:
@EN A native membrane-bound form and a solubilized (purified ) form of acetylcholinesterase were prepared from mouse brain, and the effects of nonionic surfactants on both solubilization of the bound enzyme and stabilization of the solubilized
enzyme
were investigated. For the solubilization of acetylcholinesterase from mouse brain membrane, treatment with surfactants was more effective than hydrolytic enzymes or a high ionic-strength treatment, and Triton Km value(46.0 μM) than the
membrane-bound
enzyme (59.5μM). This Km value was not changed in the presence of Triton X-100. The Km value of membrane-bound enzyme decreased slightly (13%) to 51.8 μM in the presence of Triton X-100. The solubilized enzyme showed an increased (35%) Vmax
value
after exposure to Triton X-100, while the Vmax value of the membrane-bound enzyme was not significantly affected. Most of the nonionic surfactants tested effectively stabilized the solubilized enzyme. The stabilization effect of Triton X-100
increased
in proportion to an increase in concentration of the surfactant, up to its critical micellar concentration. Nonionic surfactants having lower CMC values were generally more effective in the stabilization of the purified enzyme. This suggests that
stabilization of solubilized acetylcholinesterase by nonionic surfactants is due to binding of the surfactants to the hydrophobic domain of the enzyme thus keeping the enzyme in a micellar environment.
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