This family includes uncharacterised proteins predominantly found in Firmicutes, including Uncharacterized protein YfhH from Bacillus subtilis and protein GK0453 from Geobacillus kaustophilus. GK0453 shows two small domains: an helix-turn-helix like motif is found in its N-terminal domain while an SH3-like beta-barrel like structure is observed its C-terminal region. Its specific function is unknown [1]. Some of the members of this protein family are annotated as transcriptional regulators (see Q3EXU7, Q81I96).

1: Structure of the hypothetical DUF1811-family protein GK0453 from Geobacillus kaustophilus HTA426. Padmanabhan B, Nakamura Y, Antonyuk SV, Strange RW, Hasnain SS, Yokoyama S, Bessho Y; Acta Crystallogr Sect F Struct Biol Cryst Commun. 2013;69:342-345. PMID:23545635