Add time:09/04/2019 Source:sciencedirect.com
Endopeptidase-24.11 (‘enkephalinase’, EC 3.4.24.11) from pig kidney hydrolysed neurokinin B at 4 sites:The major site of hydrolysis was the Gly8-Leu9 bond. Angiotensin converting enzyme (peptidyl dipeptidase A, EC 3.4.15.1) from pig kidney hydrolysed substance P releasing the C-tenninal tripeptide Gly-Leu-MetNH2 but failed to hydrolyse neurokinin B. Pig brain striatal synaptic membranes hydrolysed neurokinin B producing a similar pattern of products as did endopeptidase-24.11. Substantial inhibition of this activity was achieved with the selective inhibitor phosphoramidon. A combination of phosphoramidon and bestatin abolished the hydrolysis of neurokinin B by synaptic membranes. Thus, a bestatin-sensitive aminopeptidase may play a role in the synaptic metabolism of neurokinin B in addition to endopeptidase-24.11. This aminopeptidase appears to be distinct from aminopeptidase N (EC 3.4.11.2).
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