This family represents the Salmonella outer membrane lipoprotein InvH. The molecular function of this protein is unknown, but it is required for the localisation to outer membrane of InvG, which is involved in a type III secretion apparatus mediating host cell invasion [1,2].

1: The Salmonella typhimurium InvH protein is an outer membrane lipoprotein required for the proper localization of InvG. Daefler S, Russel M; Mol Microbiol 1998;28:1367-1380. PMID:9680224

2: Salmonella InvG forms a ring-like multimer that requires the InvH lipoprotein for outer membrane localization. Crago AM, Koronakis V; Mol Microbiol 1998;30:47-56. PMID:9786184