Abstract:The role of cytochrome bse2, a fragile constituent of the respiratory terminal oxidase supercomplex of the thermoacidophilic archaeon, Sulfolobus sp. strain 7, was investigated spectroscopically in the membrane-bound state. Cytochrome bse2 did not react with CO or cyanide in the membrane-bound state, while it was irreversibly modified to a CO-reactive form (bss9) upon solubilization in the presence of cholate and LiCI. Cyanide titration analyses with the succinate-reduced membrane suggested that cytochrome bss… Show more
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