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A membrane fraction from the electric organ of Torpedo marmorata hydrolyses the Gly3-Phe4 bond of [D-Ala2, Leu5]enkephalin as well as the Gly-His bond of benzoyl-Gly-His-Leu. The hydrolysis of benzoyl-Gly-His-Leu is completely inhibitable by Captopril (I50 = 19nM), consistent with peptidyl dipeptidase activity, but enkephalin hydrolysis is inhibited to a maximum of only 70%. The residual activity hydrolysing enkephalin is inhibited by phosphoramidon (I50 = 15nM) and therefore resembles endopeptidase-24.11, a mammalian plasma-membrane enzyme implicated in the metabolism of neuropeptides. Both enkephalin-hydrolysing activities in Torpedo electric organ are inhibited by 1,10-phenanthroline, like their mammalian counterparts. The peptidases may function in the hydrolysis of endogenous peptides or in neurotransmitter exocytosis in the electric organ.

biochemical journal

The metabolism of neuropeptides. Both phosphoramidon-sensitive and captopril-sensitive metallopeptidases are present in the electric organ of <i>Torpedo marmorata</i>

The metabolism of neuropeptides. Both phosphoramidon-sensitive and captopril-sensitive metallopeptidases are present in the electric organ of Torpedo marmorata