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Trefoil domain
Trefoil (P-type) domain is a cysteine-rich domain of approximately forty five amino-acid residues has been found in some extracellular eukaryotic proteins. It is known as either the 'P', 'trefoil' or 'TFF' domain, and contains six cysteines linked by three disulphide bonds with connectivity 1-5, 2-4, 3-6.
The domain has been found in a variety of extracellular eukaryotic proteins,〔〔〔 including protein pS2 (TFF1) a protein secreted by the stomach mucosa; spasmolytic polypeptide (SP) (TFF2), a protein of about 115 residues that inhibits gastrointestinal motility and gastric acid secretion; intestinal trefoil factor (ITF) (TFF3); ''Xenopus laevis'' stomach proteins xP1 and xP4; xenopus integumentary mucins A.1 (preprospasmolysin) and C.1, proteins which may be involved in defense against microbial infections by protecting the epithelia from the external environment; xenopus skin protein xp2 (or APEG); Zona pellucida sperm-binding protein B (ZP-B); intestinal sucrase-isomaltase ( / ), a vertebrate membrane bound, multifunctional enzyme complex which hydrolyzes sucrose, maltose and isomaltose; and lysosomal alpha-glucosidase ().
== Examples ==
Human gene encoding proteins containing the trefoil domain include:
* acid alpha-glucosidase, MGAM, TFF1, TFF2, TFF3, and ZP4.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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