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New microviridins from a water bloom of the cyanobacterium Microcystis aeruginosa
Authors:Vered Reshef
Affiliation:School of Chemistry, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Ramat Aviv, Tel Aviv 69978, Israel
Abstract:Three new microviridins namely, SD1684 (1), SD1634 (2), and SD1652 (3), were isolated from the hydrophilic extract of Microcystis aeruginosa. The planar structures of compounds 1-3 were determined by homonuclear and inverse-heteronuclear 2D-NMR techniques as well as by high-resolution mass spectrometry. The absolute configuration of the asymmetric centers was studied using Marfey's method for HPLC. Compounds 1-3 contain l-threo-β-hydroxy aspartic acid as a building block of the peptide chain. This is the first example where microviridins contain non-proteinogenic amino acid in their structure. Compound 2 is a mild serine protease inhibitor.
Keywords:Natural products   Cyanobacteria   Microcystis aeruginosa   Protease inhibitors
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