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Three muraceins , a family of muramyl peptides, were isolated from Nocardia orientalis as inhibitors of angiotensin-converting enzyme (ACE). Muracein A, the most potent inhibitor, inhibited ACE competitively with a Ki of 1.5 microM. Liver alcohol dehydrogenase and carboxypeptidase A, two other zinc-containing enzymes, were not inhibited at 150 microM. Inhibition of ACE could not be reversed by divalent cations.

journal of antibiotics

Muraceins - Muramyl peptides produced by Nocardia orientalis as angiotensin-converting enzyme inhibitors I. Taxonomy, fermentation and biological properties.