Abstract
1. Five species of Mytilus inhibitory peptides, MIP 1–5, were isolated from acetone extracts of the anterior byssus retractor muscle (ABRM) of Mytilus edulis. MIP 1 and MIP 2 were shown to be S 2-MIP and A 2-MIP, respectively, first isolated from the pedal ganglia of the animal. 2. All the five peptides had a common C-terminal structure of -Pro-Xaa-Phe-Val-NH 2, which was shown to be important for their biological activity. 3. The five MIPs showed similar inhibitory effects on contractions of the ABRM but did not affect catch tension and its relaxation. 4. In addition to the MIPs, catch-relaxing peptide (CARP) was also found in the ABRM.
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