This family consists of several bacterial sequences which are related to the EthD protein of Rhodococcus ruber (Swiss:Q93EX2). In Rhodococcus ruber, EthD is thought to be involved in the degradation of ethyl tert-butyl ether (ETBE). EthD synthesis is induced by ETBE but it's exact function is unknown, it is however thought to be essential to the ETBE degradation system.

1: Cloning of a genetically unstable cytochrome P-450 gene cluster involved in degradation of the pollutant ethyl tert-butyl ether by Rhodococcus ruber. Chauvaux S, Chevalier F, Le Dantec C, Fayolle F, Miras I, Kunst F, Beguin P; J Bacteriol 2001;183:6551-6557. PMID:11673424