单词 | Enterotoxin CT,Cholera |
释义 | Enterotoxin CT,Cholera《英文msh词典》Enterotoxin CT,Cholera [入口词] Enterotoxin CT,Cholera [主题词] Cholera Toxin [药动学] Adjuvants,Immunologic [英文释义] An ENTEROTOXIN from VIBRIO CHOLERAE. It consists of two major protomers,the heavy (H) or A subunit and the B protomer which consists of 5 light (L) or B subunits. The catalytic A subunit is proteolytically cleaved into fragments A1 and A2. The A1 fragment is a MONO(ADP-RIBOSE) TRANSFERASE. The B protomer binds cholera toxin to intestinal epithelial cells,and facillitate the uptake of the A1 fragment. The A1 catalyzed transfer of ADP-RIBOSE to the alpha subunits of heterotrimeric G PROTEINS activates the production of CYCLIC AMP. Increased levels of cyclic AMP are thought to modulate release of fluid and electrolytes from intestinal crypt cells. |
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