This is the C-terminal domain of the ethanolamine utilization protein EutK. It is a helix-turn-helix domain and is predicted to bind to nucleic acids [1].

1: Structure and mechanisms of a protein-based organelle in Escherichia coli. Tanaka S, Sawaya MR, Yeates TO; Science. 2010;327:81-84. PMID:20044574