This domain is found at the N-terminal end of a group of proteins predominantly found in fungi, plants and basal metazoans, including Mitochondrial inner membrane i-AAA protease supercomplex subunit YME1 from Saccharomyces cerevisiae. This domain shows a This domain shows a tetratricopeptide repeat fold [1].

1: Structure and evolution of N-domains in AAA metalloproteases. Scharfenberg F, Serek-Heuberger J, Coles M, Hartmann MD, Habeck M, Martin J, Lupas AN, Alva V; J Mol Biol. 2015;427:910-923. PMID:25576874