This family consists of several SseB proteins which appear to be found exclusively in Enterobacteria. SseB is known to enhance serine-sensitivity in Escherichia coli [1] and is part of the Salmonella pathogenicity island 2 (SPI-2) translocon [2]. This presumed domain is found at the C-terminus of SseB proteins.

1: Enhancement of serine-sensitivity by a gene encoding rhodanese-like protein in Escherichia coli. Hama H, Kayahara T, Ogawa W, Tsuda M, Tsuchiya T; J Biochem (Tokyo) 1994;115:1135-1140. PMID:7982894

2: SseA is a chaperone for the SseB and SseD translocon components of the Salmonella pathogenicity-island-2-encoded type III secretion system. Ruiz-Albert J, Mundy R, Yu XJ, Beuzon CR, Holden DW; Microbiology 2003;149:1103-1111. PMID:12724372