IcmF_C family represents a conserved region situated towards the C-terminal end of IcmF-like proteins. It was thought to be involved in Vibrio cholerae cell surface reorganisation that results in increased adherence to epithelial cells leading to an increased conjugation frequency [1]. IcmF as a whole interacts with DotU whereby these bind tightly and form the docking area of the T6SS within the inner membrane. The exact function of this domain is not clear [2].

1: Involvement of in vivo induced icmF gene of Vibrio cholerae in motility, adherence to epithelial cells, and conjugation frequency. Das S, Chakrabortty A, Banerjee R, Chaudhuri K; Biochem Biophys Res Commun 2002;295:922-928. PMID:12127983

2: The rise of the Type VI secretion system. Filloux A; F1000Prime Rep. 2013;5:52. PMID:24381728