Guo YJ, Zhang Y, Liu YX, Lin ZH. Effects of some alcohols on the conformation of mitochondrial H+-ATPase complex and F1-ATPase from pig heart.
BIOCHIMICA ET BIOPHYSICA ACTA 1987;
894:11-5. [PMID:
2889469 DOI:
10.1016/0005-2728(87)90207-6]
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Abstract
The conformations of the H+-ATPase complex and F1-ATPase in low concentrations of methanol, ethanol, n-propanol, iso-propanol and t-butanol were studied by circular dichroism. For F1-ATPase, all but methanol first increased and then decreased the circular dichroism magnitude of helical bands as the alcohol concentration was increased. With ethanol, n-propanol, iso-propanol and t-butanol, the alpha-helix content reached a maximum at about 5% alcohol and began to decrease at 10%. The content of beta-sheet showed the opposite effect, reaching a minimum at 5% and increasing slightly at higher concentrations. None of the alcohols studied had a significant effect on the conformation of the H+-ATPase complex. This difference implies that the alcohols had a greater effect on free F1-ATPase than on the membrane-bound F1-ATPase. The hydrophobic protein F0 and the membrane lipids in the H+-ATPase complex may stabilize and protect F1 from the effects of the alcohols.
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