Mrs2p is an essential component of the major electrophoretic Mg2+ influx system in mitochondria.

Abstract excerpt

Steady-state concentrations of mitochondrial Mg(2+) previously have been shown to vary with the expression of Mrs2p, a component of the inner mitochondrial membrane with two transmembrane domains. While its structural and functional similarity to the bacterial Mg(2+) transport protein CorA suggested a role for Mrs2p in Mg(2+) influx into the organelle, other functions in cation homeostasis could not be excluded....

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