Catalytic activity:ATP + H (2) O + xenobiotic (In) = ADP + phosphate + xenobiotic (Out) . ,Disease:Genetic variations in ABCB1 are associated with susceptibility to inflammatory bowel disease type 13 (IBD13) [MIM:612244]. Inflammatory bowel disease is characterized by a chronic relapsing intestinal inflammation. It is subdivided into Crohn disease and ulcerative colitis phenotypes. Crohn disease may involve any part of the gastrointestinal tract , but most frequently the terminal ileum and colon. Bowel inflammation is transmural and discontinuous; it may contain granulomas or be associated with intestinal or perianal fistulas. In contrast , in ulcerative colitis , the inflammation is continuous and limited to rectal and colonic mucosal layers; fistulas and granulomas are not observed. Both diseases include extraintestinal inflammation of the skin , eyes , or joints. Crohn disease and ulcerative colitis are commonly classified as autoimmune diseases. ,Function:Energy-dependent efflux pump responsible for decreased drug accumulation in multidrug-resistant cells. ,online information:P-glycoprotein entry ,online information:The Singapore human mutation and polymorphism database ,polymorphism:Genetic variation in ABCB1 may play a role in patients who do not respond to drug treatment. ,similarity:Belongs to the ABC transporter family. ,similarity:Belongs to the ABC transporter family. Multidrug resistance exporter (TC 3.A.1.201) subfamily. ,similarity:Contains 2 ABC transmembrane type-1 domains. ,similarity:Contains 2 ABC transporter domains. ,tissue specificity:Expressed in liver , kidney , small intestine and brain. ,
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