title: Muraceins--muramyl peptides produced by Nocardia orientalis as angiotensin-converting enzyme inhibitors. II. Isolation and structure determination.
abstract: Three new muramyl peptides ( muraceins A, B and C) have been isolated from fermentations of Nocardia orientalis as inhibitors of angiotensin-converting enzyme (ACE). Structures 1 and 2, for muraceins A and B respectively, were deduced from their spectroscopic properties. Muracein C, 3, was shown to be a muramyl pentapeptide containing N-acetylmuramic acid, alanine, glutamic acid, serine and diaminopimelic acid in a 1:2:1:1:1 ratio based on the 1H NMR integration.
mesh_terms: D000119:Acetylmuramyl-Alanyl-Isoglutamine / Q000031:analogs & derivatives* / Q000302:isolation & purification; D000595:Amino Acid Sequence; D000806:Angiotensin-Converting Enzyme Inhibitors; D055598:Chemical Phenomena; D002621:Chemistry; D009682:Magnetic Resonance Spectroscopy; D009615:Nocardia; D013329:Structure-Activity Relationship
chemical_list: D000806:Angiotensin-Converting Enzyme Inhibitors; D000119:Acetylmuramyl-Alanyl-Isoglutamine; C041439:muracein A; C041440:muracein B; C041441:muracein C; C041442:SQ 28370