FadA (Fusobacterium adhesin A) is an adhesin which forms two alpha helices that form an intra-molecular coiled-coil arrangement.

1: Identification and characterization of a novel adhesin unique to oral fusobacteria. Han YW, Ikegami A, Rajanna C, Kawsar HI, Zhou Y, Li M, Sojar HT, Genco RJ, Kuramitsu HK, Deng CX; J Bacteriol. 2005;187:5330-5340. PMID:16030227

2: Crystal structure of FadA adhesin from Fusobacterium nucleatum reveals a novel oligomerization motif, the leucine chain. Nithianantham S, Xu M, Yamada M, Ikegami A, Shoham M, Han YW; J Biol Chem. 2009;284:3865-3872. PMID:18996848