Abstract
Mitochondria (or mitoplasts) and submitochondrial particles from yeast were treated with [125I] diazobenzenesulfonate to label selectively proteins exposed on the outer or inner surface of the inner mitochondrial membrane. Polyacrylamide gel analysis of the immunoprecipitates formed with antibodies against Complex III or cytochromeb revealed that the two core proteins and cytochromeb were labeled in both mitochondria and submitochondrial particles, suggesting that these proteins span the membrane. Cytochromec 1 and the iron sulfur protein were labeled in mitochondria but not in submitochondrial particles, suggesting that these proteins are exposed on the cytosolic side of the inner membrane. The steady-state reduction of cytochromesb andc 1 was determined with succinate and the decyl analogue of coenzyme Q as substrates. Addition of the coenzyme Q analogue to mitochondria caused reduction of 15–30% of the total dithionite-reducibleb and 100% of the cytochromec 1: Addition of the coenzyme Q analogue to submitochondrial particles led to the reduction of 70% of the total dithionite-reducible cytochromeb but insignificant amounts of cytochromec 1. A model to explain the topography of Complex III in the inner membrane is proposed based on these results.
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Abbreviations used: DABS, diazobenzene sulfonate; DBH2, reduced form of decyl analogue of coenzyme Q (2,3-dimethoxy-5-methyl-6-n-decyl-1,4-benzoquinone); PMSF, phenylmethylsulfonyl fluoride; SDS, sodium dodecyl sulfate.
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Beattie, D.S., Clejan, L., Chen, YS. et al. Orientation of complex III in the yeast mitochondrial membrane: Labeling with [125I] diazobenzenesulfonate and functional studies with the decyl analogue of coenzyme Q as substrate. J Bioenerg Biomembr 13, 357–373 (1981). https://doi.org/10.1007/BF00743210
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DOI: https://doi.org/10.1007/BF00743210