Brierley 1994 J Bioenerg Biomembr
| Brierley GP, Baysal K, Jung DW (1994) Cation transport systems in mitochondria: Na+ and K+ uniports and exchangers. J Bioenerg Biomembr 26:519-26. |
Brierley GP, Baysal K, Jung DW (1994) J Bioenerg Biomembr
Abstract: It is now well established that mitochondria contain three antiporters that transport monovalent cations. A latent, allosterically regulated K+/H+ antiport appears to serve as a cation-extruding device that helps maintain mitochondrial volume homeostasis. An apparently unregulated Na+/H+ antiport keeps matrix [Na+] low and the Na(+)-gradient equal to the H(+)-gradient. A Na+/Ca2+ antiport provides a Ca(2+)-extruding mechanism that permits the mitochondrion to regulate matrix [Ca2+] by balancing Ca2+ efflux against influx on the Ca(2+)-uniport. All three antiports have well-defined physiological roles and their molecular properties and regulatory features are now being determined. Mitochondria also contain monovalent cation uniports, such as the recently described ATP- and glibenclamide-sensitive K+ channel and ruthenium red-sensitive uniports for Na+ and K+. A physiological role of such uniports has not been established and their properties are just beginning to be defined.
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Labels:
Regulation: Calcium, Ion;substrate transport
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