Jizanpeptins, Cyanobacterial Protease Inhibitors from a <i>Symploca</i> sp. Cyanobacterium Collected in the Red Sea
作者:David A. Gallegos、Josep Saurí、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
DOI:10.1021/acs.jnatprod.8b00117
日期:2018.6.22
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.