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Updated: Jun 26, 2026

Antimicrobial Peptides Produced by Selective Pressure Incorporation of Non-canonical Amino Acids
Published on: May 4, 2018
Antiprotealide is a natural product
Rama Rao Manam1, Venkat R Macherla, Ginger Tsueng
1Nereus Pharmaceuticals, Inc, 10480 Wateridge Circle, San Diego, California 92121, USA.
Abstract:
Large-scale fermentation of the marine actinomycete Salinispora tropica for production of salinosporamide A (NPI-0052; 1) clinical trials materials provided crude extracts containing minor secondary metabolites, including salinosporamide B (2) and a new congener, 3. Spectroscopic characterization revealed that 3 is identical to antiprotealide, a molecular hybrid of 20S proteasome inhibitors 1 and omuralide (4) not previously described as a natural product. Analysis of crude extracts from shake flask cultures of three wild-type S. tropica strains confirmed the production of antiprotealide at 1.1, 0.8, and 3.0 mg/L. Thus, antiprotealide is a natural product metabolite of S. tropica.
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