pfam05019: Coq4 (This model is not part of the current CDD release)
Coenzyme Q (ubiquinone) biosynthesis protein Coq4
Coq4p was shown to peripherally associate with the matrix face of the mitochondrial inner membrane. The putative mitochondrial- targeting sequence present at the amino-terminus of the polypeptide efficiently imported it to mitochondria. The function of Coq4p is unknown, although its presence is required to maintain a steady-state level of Coq7p, another component of the Q biosynthetic pathway. The overall structure of Coq4 is alpha helical and shows resemblance to haemoglobin/myoglobin.
Jiyao W et al.(2023). "The conserved domain database in 2023.",