The terminal electron transfer enzyme Me2SO reductase of Escherichia coli is a heterotrimeric enzyme composed of a membrane extrinsic catalytic dimer (DmsAB) and a membrane intrinsic polytopic anchor subunit (DmsC) [1].

1: The topology of the anchor subunit of dimethyl sulfoxide reductase of Escherichia coli. Weiner JH, Shaw G, Turner RJ, Trieber CA; J Biol Chem 1993;268:3238-3244. PMID:8429002