Jizanpeptins, Cyanobacterial Protease Inhibitors from a Symploca sp. Cyanobacterium Collected in the Red Sea

David A. Gallegos, Josep Sauri, Ryan D. Cohen, Xuemei Wan, Patrick Videau, Alec O. Vallota-Eastman, Lamiaa A. Shaala, Diaa T. A. Youssef, R. Thomas Williamson, Gary E. Martin, Benjamin Philmus, Aleksandra E. Sikora, Jane E. Ishmael, Kerry L. McPhail

Research output: Indexed journal article Articlepeer-review

20 Citations (Scopus)

Abstract

Jizanpeptins A-E (1-5) are micropeptin depsipeptides isolated from a Red Sea specimen of a Symploca sp. cyanobacterium. The planar structures of the jizanpeptins were established using NMR spectroscopy and mass spectrometry and contain 3-amino-6-hydroxy-2-piperidone (Ahp) as one of eight residues in a typical micropeptin motif, as well as a side chain terminal glyceric acid sulfate moiety. The absolute configurations of the jizanpeptins were assigned using a combination of Marfey's methodology and chiral-phase HPLC analysis of hydrolysis products compared to commercial and synthesized standards. Jizanpeptins A-E showed specific inhibition of the serine protease trypsin (IC50 = 72 nM to 1 mu M) compared to chymotrypsin (IC50 = 1.4 to >10 mu M) in vitro and were not overtly cytotoxic to HeLa cervical or NCI-H460 lung cancer cell lines at micromolar concentrations.
Original languageEnglish
Pages (from-to)1417-1425
Number of pages9
JournalJournal of Natural Products
Volume81
Issue number6
DOIs
Publication statusPublished - Jun 2018
Externally publishedYes

Keywords

  • Marine cyanobacterium
  • Serine-protease
  • Vibrio-cholerae
  • Moorea-producens
  • High-throughput
  • Microcystis-aeruginosa
  • Lyngbya-confervoides
  • Elastase inhibitors
  • Cyclic depsipeptide
  • Fresh-water

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