This enzyme was purified from the mitochondrial inner membrane. The enzyme has a preference for long-chain substrates, and activity with a C16 substrate was 6- to 15-fold higher than with a C4 substrate (cf. EC 22.214.171.124 3-hydroxyacyl-CoA dehydrogenase).
El-Fakhri, M. and Middleton, B. The existence of an inner-membrane-bound, long acyl-chain-specific 3-hydroxyacyl-CoA dehydrogenase in mammalian mitochondria. Biochim. Biophys. Acta713 (1982) 270–279. [PMID: 7150615]