Cytotoxic halogenated macrolides and modified peptides from the apratoxin-producing marine cyanobacterium Lyngbya bouillonii from Guam

J Nat Prod. 2010 Sep 24;73(9):1544-52. doi: 10.1021/np1004032.

Abstract

Collections of the marine cyanobacterium Lyngbya bouillonii from shallow patch reefs in Apra Harbor, Guam, afforded three hitherto undescribed analogues of the glycosidic macrolide lyngbyaloside, namely, 2-epi-lyngbyaloside (1) and the regioisomeric 18E- and 18Z-lyngbyalosides C (2 and 3). Concurrently we discovered two new analogues of the cytoskeletal actin-disrupting lyngbyabellins, 27-deoxylyngbyabellin A (4) and lyngbyabellin J (5), a novel macrolide of the laingolide family, laingolide B (6), and a linear modified peptide, lyngbyapeptin D (7), along with known lyngbyabellins A and B, lyngbyapeptin A, and lyngbyaloside. The structures of 1-7 were elucidated by a combination of NMR spectroscopic and mass spectrometric analysis. Compounds 1-6 were either brominated (1-3) or chlorinated (4-6), consistent with halogenation being a hallmark of many marine natural products. All extracts derived from these L. bouillonii collections were highly cytotoxic due to the presence of apratoxin A or apratoxin C. Compounds 1-5 showed weak to moderate cytotoxicity to HT29 colorectal adenocarcinoma and HeLa cervical carcinoma cells.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Antineoplastic Agents / chemistry
  • Antineoplastic Agents / isolation & purification*
  • Antineoplastic Agents / pharmacology*
  • Cyanobacteria / chemistry*
  • Depsipeptides / chemistry
  • Depsipeptides / isolation & purification*
  • Depsipeptides / pharmacology*
  • Drug Screening Assays, Antitumor
  • Guam
  • HT29 Cells
  • HeLa Cells
  • Humans
  • Hydrocarbons, Halogenated / chemistry
  • Hydrocarbons, Halogenated / isolation & purification*
  • Hydrocarbons, Halogenated / pharmacology*
  • Lyngbya Toxins / chemistry*
  • Macrolides / chemistry
  • Macrolides / isolation & purification*
  • Macrolides / pharmacology*
  • Marine Biology
  • Molecular Structure
  • Nuclear Magnetic Resonance, Biomolecular
  • Stereoisomerism

Substances

  • Antineoplastic Agents
  • Depsipeptides
  • Hydrocarbons, Halogenated
  • Lyngbya Toxins
  • Macrolides
  • apratoxin C
  • lyngbyabellin A