The S. cerevisiae Mgr1 protein has been shown to be required for mitochondrial viability in yeast lacking mitochondrial DNA. It is a mitochondrial inner membrane protein, which interacts with Yme1 and is a new subunit of the i-AAA protease complex [1].

1: A Genomewide Screen for Petite-negative Yeast Strains Yields a New Subunit of the i-AAA Protease Complex. Dunn CD, Lee MS, Spencer FA, Jensen RE; Mol Biol Cell. 2006;17:213-226. PMID:16267274