Cohesin domains interact with a complementary domain, termed the dockerin domain. The cohesin-dockerin interaction is the crucial interaction for complex formation in the cellulosome [1].

1: A cohesin domain from Clostridium thermocellum: the crystal structure provides new insights into cellulosome assembly. Shimon LJ, Bayer EA, Morag E, Lamed R, Yaron S, Shoham Y, Frolow F; Structure 1997;5:381-390. PMID:9083107