Mitochondrial-matrix proteins at unexpected locations: are they exported?
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Many proteins that were originally characterized on the basis of non-mitochondrial functions have unexpectedly been shown to be identical to mitochondrial-matrix proteins. Most of these proteins are encoded by single nuclear genes and are initially targeted to the mitochondrial matrix. We suggest that mitochondria, as organelles of bacterial origin, possess specific mechanisms for export of proteins to other compartments.
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