This domain is found at the C-terminal end of the putative fimbrium tip subunit Fim1C from Parabacteroides distasonis, and similar proteins from bacteroidetes. Fim1C is thought to be a component of the fimbrium tip that plays a role on the mediation of cell adhesion and biofilm formation. This domain shows transthyretin-like fold that contains seven core beta- strands arranged in two beta-sheets [1].

1: A Distinct Type of Pilus from the Human Microbiome. Xu Q, Shoji M, Shibata S, Naito M, Sato K, Elsliger MA, Grant JC, Axelrod HL, Chiu HJ, Farr CL, Jaroszewski L, Knuth MW, Deacon AM, Godzik A, Lesley SA, Curtis MA, Nakayama K, Wilson IA; Cell. 2016;165:690-703. PMID:27062925