alpha Conotoxins
《英文msh詞典》alpha Conotoxins
[入口詞] alpha Conotoxins
[主題詞] Conotoxins
[藥動學] Calcium Channel Blockers
[英文釋義] Peptide neurotoxins from the marine fish-hunting snails of the genus Conus. They contain 13 to 29 amino acids which are strongly basic and are highly cross-linked by disulfide bonds. There are three types of conotoxins,omega-,alpha-,and mu-. OMEGA-CONOTOXINS inhibit voltage-activated entry of calcium into the presynaptic membrane and therefore the release of ACETYLCHOLINE. Alpha-conotoxins inhibit the postsynaptic acetylcholine receptor. Mu-conotoxins prevent the generation of muscle action potentials. (From Concise Encyclopedia Biochemistry and Molecular Biology,3rd ed)