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. 1983 Jan;153(1):57–65. doi: 10.1128/jb.153.1.57-65.1983

Orientation of succinate dehydrogenase and cytochrome b558 in the Bacillus subtilis cytoplasmic membrane.

L Hederstedt, L Rutberg
PMCID: PMC217341  PMID: 6401289

Abstract

The orientation of the three subunits of the membrane-bound succinate dehydrogenase (SDH)-cytochrome b558 complex in Bacillus subtilis was studied in protoplasts ("right side out") and isolated membranes (random orientation), using immunoadsorption and surface labeling with [35S]diazobenzenesulfonate. Anti-SDH antibodies were adsorbed by isolated membranes but not by protoplasts. The SDH Mr 65,000 flavoprotein subunit was labeled with [35S]diazobenzenesulfonate in isolated membranes but not in protoplasts. The flavoprotein subunit is thus located on the cytoplasmic side of the membrane. The location of the SDH Mr 28,000 iron-protein subunit was not definitely established, but most probably the iron-protein subunit also is located on the cytoplasmic side of the membrane. Antibodies were not obtained to the hydrophobic cytochrome b558. The cytochrome was strongly labeled with [35S]diazobenzenesulfonate in protoplasts, and labeling was also obtained with isolated membranes. Cytochrome b558 is thus exposed on the outside of the membrane. In B. subtilis SDH binds specifically to cytochrome b558, which suggests that the cytochrome is exposed also on the cytoplasmic side of the membrane. The results obtained suggest that the B. subtilis SDH is exclusively located on the cytoplasmic side of the membrane where it is bound to cytochrome b558, which spans the membrane.

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