This domain is found at the C-terminus of Legionella LssY proteins, which may be a part of the type I secretion system [1]. This domain is functionally uncharacterised. This domain is found in bacteria, and is typically between 182 and 195 amino acids in length. It is often found in association with Pfam:PF09335 and PF01569. There are two completely conserved residues (P and W) that may be functionally important.

1: Virulence factors encoded by Legionella longbeachae identified on the basis of the genome sequence analysis of clinical isolate D-4968. Kozak NA, Buss M, Lucas CE, Frace M, Govil D, Travis T, Olsen-Rasmussen M, Benson RF, Fields BS; J Bacteriol. 2010;192:1030-1044. PMID:20008069