The YfkD-like protein family includes the B. subtilis YfkD protein Swiss:O34579, which is functionally uncharacterised. Its expression is regulated by the sigma factor sigma-B, which regulates the expression of stress-response proteins, and by the forespore-specific sigma factor sigma-G [1,2]. This family of proteins is found in bacteria. Proteins in this family are typically between 254 and 265 amino acids in length.

1: Proteomics characterization of novel spore proteins of Bacillus subtilis. Kuwana R, Kasahara Y, Fujibayashi M, Takamatsu H, Ogasawara N, Watabe K; Microbiology. 2002;148:3971-3982. PMID:12480901

2: Characterization of Bacillus subtilis YfkE (ChaA): a calcium-specific Ca2+/H+ antiporter of the CaCA family. Fujisawa M, Wada Y, Tsuchiya T, Ito M; Arch Microbiol. 2009;191:649-657. PMID:19543710