Mitochondrial S-adenosyl-L-methionine/S-adenosyl-L-homocysteine antiporter. Mediates the exchange of cytosolic S-adenosyl-L-methionine, the predominant methyl-group donor for macromolecule methylation processes, for mitochondrial S-adenosylhomocysteine(SAH), a by-product of methylation reactions

Mitochondrion inner membrane

Combined oxidative phosphorylation deficiency 28

An autosomal recessive mitochondrial disorder characterized by decreased activities of respiratory chain enzymes, and variable clinical manifestations. Clinical features include episodic metabolic decompensation beginning in infancy, mild muscle weakness, cardiorespiratory insufficiency, developmental delay, or even death.