The structure of the DsrD protein has shown it to contain a winged-helix motif similar to those found in DNA binding proteins [1]. The structure suggests a possible role for DsrD in transcription of translation of genes which catalyse dissimilatory sulfite reduction.

1: Crystal structure of dissimilatory sulfite reductase D (DsrD) protein--possible interaction with B- and Z-DNA by its winged-helix motif. Mizuno N, Voordouw G, Miki K, Sarai A, Higuchi Y; Structure. 2003;11:1133-1140. PMID:12962631