DsrE is a small soluble protein involved in intracellular sulfur reduction [1]. This family also includes DsrF and the homologues TusD/C. n E. coli, the DsrEFH homologue TusBCD interacts with the DsrC homologue TusE in a sulfur relay system during 2-thiouridine biosynthesis [2].

1: Sirohaem sulfite reductase and other proteins encoded by genes at the dsr locus of Chromatium vinosum are involved in the oxidation of intracellular sulfur. Pott AS, Dahl C; Microbiology 1998;144:1881-1894. PMID:9695921

2: Mechanistic insights into sulfur relay by multiple sulfur mediators involved in thiouridine biosynthesis at tRNA wobble positions. Ikeuchi Y, Shigi N, Kato J, Nishimura A, Suzuki T; Mol Cell. 2006;21:97-108. PMID:16387657