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- W2027366956 abstract "A preparation of ATPase from the membranes of Micrococcus lysodeikticus, solubilized and more than 95 %. pure, showed two main bands in analytical polyacrylamide gel electrophoresis. They did not correspond to isoenzymes because one band could be converted into the other by exposure to a mildly alkaline pH value. The conversion was paralleled by changes in molecular weight, circular dichroism and catalytic properties. Denaturation by pH at 25 °C was followed by means of circular dichroism, ultracentrifugation and polyacrylamide gel electrophoresis. A large conformational transition took place in the acid range with midpoints at about pH = 3.6 (I = 10−4 M), 4.3 (I = 0.03 M) and 5.3 (I = 0.1 M). The transition was irreversible. Strong aggregation of the protein occurred in this range of pH. The final product was largely random coil, but even at pH 1.5 dissociation into individual subunits was not complete. However, partial dissociation took place at pH 5 (I = 0.028 M). At this pH value the enzyme was inactive, but 20–30 % of the activity could be recovered when the pH was returned to 7.5. In the alkaline region the midpoint of the transition occurred near pH = 11 (I = 0.028 M). The pK of most of the tyrosine residues of the protein was about 10.9. The unfolding was irreversible and the protein was soon converted into peptide species with molecular weights lower than those determined for the subunits by gel clectrophoresis in the presence of sodium dodecyl sulphate. Conventional proteolysis did not account for the transformation." @default.
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- W2027366956 date "1975-12-01" @default.
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- W2027366956 title "Confomational and molecular responses to pH variation of the purified membrane adenosine triphospate of Micrococcus lysodeikticus" @default.
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- W2027366956 doi "https://doi.org/10.1016/0005-2736(75)90123-6" @default.
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