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Properties of the inner membrane anion channel in intact mitochondria

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Abstract

The mitochondrial inner membrane possesses an anion channel (IMAC) which mediates the electrophoretic transport of a wide variety of anions and is believed to be an important component of the volume homeostatic mechanism. IMAC is regulated by matrix Mg2+ (IC50=38 µM at pH 7.4) and by matrix H+ (pIC50=7.7). Moreover, inhibition by Mg2+ is pH-dependent. IMAC is also reversibly inhibited by many cationic amphiphilic drugs, including propranolol, and irreversibly inhibited byN,N′-dicyclohexylcarbodiimide. Mercurials have two effects on its activity: (1) they increase the IC50 values for Mg2+, H+, and propranolol, and (2) they inhibit transport. The most potent inhibitor of IMAC is tributyltin, which blocks anion uniport in liver mitochondria at about 1 nmol/mg. The inhibitory dose is increased by mercurials; however, this effect appears to be unrelated to the other mercurial effects. IMAC also appears to be present in plant mitochondria; however, it is insensitive to inhibition by Mg2+, mercurials, andN,N′-dicyclohexylcarbodiimide. Some inhibitors of the adenine nucleotide translocase also inhibit IMAC, including Cibacron Blue, agaric acid, and palmitoyl CoA; however, atractyloside has no effect.

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  1. Department of Pharmacology, Medical College of Ohio, P.O. Box 10008, 43699-0008, Toledo, Ohio

    Andrew D. Beavis

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Beavis, A.D. Properties of the inner membrane anion channel in intact mitochondria. J Bioenerg Biomembr 24, 77–90 (1992). https://doi.org/10.1007/BF00769534

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