Synthesis of Stylissamide B, a Pro-Rich Cyclic Heptapeptide Isolated From the Marine Sponge Stylissa caribica.

J Pept Sci

Department of Chemistry and Biological Engineering, Graduate School of Science and Engineering, Yamagata University, Yonezawa, Yamagata, Japan.

Published: June 2025


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Article Abstract

Stylissamide B was successfully synthesized for the first time using Fmoc solid-phase peptide synthesis (Fmoc-SPPS) followed by cyclization in solution phase. The Fmoc-SPPS process was monitored using the reversible detection method for amino groups (ReD-A method). The linear peptide, Pro-Pro-Ile-Tyr-Pro-Phe-Pro, was cyclized to form stylissamide B. The spectral data obtained were in agreement with previously reported literature, thereby confirming the reliability of the synthetic method.

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