Integrating Molecular Networking and 1H NMR To Target the Isolation of Chrysogeamides from a Library of Marine-Derived Penicillium Fungi

J Org Chem. 2019 Feb 1;84(3):1228-1237. doi: 10.1021/acs.joc.8b02614. Epub 2019 Jan 16.

Abstract

A challenging problem in natural product discovery is to rapidly dereplicate known compounds and expose novel ones from complicated components. Herein, integrating the LC-MS/MS-dependent molecular networking and 1H NMR techniques efficiently and successfully enabled the targeted identification of seven new cyclohexadepsipeptides, chrysogeamides A-G (1-7), from the coral-derived fungus Penicillium chrysogenum (CHNSCLM-0003) which was targeted from a library of marine-derived Penicillium fungi. Compound 4 features a rare 3-hydroxy-4-methylhexanoic acid (HMHA) moiety which was first discovered from marine-derived organisms. Interestingly, isotope-labeling feeding experiments confirmed that 13C1-l-Leu was transformed into 13C1-d-Leu moiety, indicating that d-Leu could be isomerized from l-Leu. Compounds 1 and 2 obviously promoted angiogenesis in zebrafish at 1.0 μg/mL with nontoxic to embryonic zebrafish at 100 μg/mL. Combining molecular networking with 1H NMR as a discovery tool will be implemented as a systematic strategy, not only for known compounds dereplication but also for untapped reservoir discovery.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Aquatic Organisms
  • Biological Products / chemistry*
  • Fungi / chemistry*
  • Penicillium / chemistry*
  • Proton Magnetic Resonance Spectroscopy
  • Tandem Mass Spectrometry / methods*

Substances

  • Biological Products