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Mar. Drugs 2017, 15(12), 371;

Inhibitors of Serine Proteases from a Microcystis sp. Bloom Material Collected from Timurim Reservoir, Israel

Raymond and Beverly Sackler School of Chemistry and Faculty of Exact Sciences, Tel-Aviv University, Ramat Aviv, Tel-Aviv 69978, Israel
Author to whom correspondence should be addressed.
Received: 23 October 2017 / Revised: 19 November 2017 / Accepted: 20 November 2017 / Published: 1 December 2017
(This article belongs to the Special Issue Compounds from Cyanobacteria II)
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Two new natural products, micropeptin TR1058 (1) and aeruginosin TR642 (2), were isolated from the hydrophilic extract of bloom material of Microcystis sp. collected from the Timurim water reservoir in Israel. The structures of compounds 1 and 2 were determined using 1D and 2D NMR spectroscopy and HR ESI MS and MS/MS techniques. Micropeptin TR1058 (1) was extremely unstable under the isolation conditions, and several degradation products were identified. NMR analysis of aeruginosin TR642 (2) revealed a mixture of eight isomers, and elucidation of its structure was challenging. Aeruginosin TR642 contains a 4,5-didehydroaraginal subunit that has not been described before. Micropeptin TR1058 (1) inhibited chymotrypsin with an IC50 of 6.78 µM, and aeruginosin TR642 (2) inhibited trypsin and thrombin with inhibition concentration (IC50) values of 3.80 and 0.85 µM, respectively. The structures and biological activities of the new compounds are discussed. View Full-Text
Keywords: cyanobacteria; Microcystis; micropeptin; aeruginosin; protease inhibitors cyanobacteria; Microcystis; micropeptin; aeruginosin; protease inhibitors

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Hasan-Amer, R.; Carmeli, S. Inhibitors of Serine Proteases from a Microcystis sp. Bloom Material Collected from Timurim Reservoir, Israel. Mar. Drugs 2017, 15, 371.

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