Domain found in Sea urchin sperm protein, Enterokinase, Agrin (SEA). Proposed function of regulating or binding carbohydrate side chains. Recently a proteolytic activity has been shown for a SEA domain [4].

1: The SEA module: a new extracellular domain associated with O-glycosylation. Bork P, Patthy L; Protein Sci 1995;4:1421-1425. PMID:7670383

2: Enterokinase, the initiator of intestinal digestion, is a mosaic protease composed of a distinctive assortment of domains. Kitamoto Y, Yuan X, Wu Q, McCourt DW, Sadler JE; Proc Natl Acad Sci U S A 1994;91:7588-7592. PMID:8052624

3: Solution structure of the SEA domain from the murine homologue of ovarian cancer antigen CA125 (MUC16). Maeda T, Inoue M, Koshiba S, Yabuki T, Aoki M, Nunokawa E, Seki E, Matsuda T, Motoda Y, Kobayashi A, Hiroyasu F, Shirouzu M, Terada T, Hayami N, Ishizuka Y, Shinya N, Tatsuguchi A, Yoshida M, Hirota H, Matsuo Y, Tani K, Arakawa T, Carninci P, Kawai J, Hay J Biol Chem 2004;279:13174-13182. PMID:14764598

4: SEA domain proteolysis determines the functional composition of dystroglycan. Akhavan A, Crivelli SN, Singh M, Lingappa VR, Muschler JL; FASEB J. 2008;22:612-621. PMID:17905726