Cytotoxic halogenated macrolides and modified peptides from the apratoxin-producing marine cyanobacterium Lyngbya bouillonii from Guam.
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.
Matthew
Susan
S
Department of Medicinal Chemistry, University of Florida, Gainesville, Florida 32610, USA.
Salvador
Lilibeth A
LA
Schupp
Peter J
PJ
Paul
Valerie J
VJ
Luesch
Hendrik
H
D000970:Antineoplastic Agents / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology*; D000458:Cyanobacteria / Q000737:chemistry*; D047630:Depsipeptides / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology*; D004354:Drug Screening Assays, Antitumor; D006141:Guam; D019073:HT29 Cells; D006367:HeLa Cells; D006801:Humans; D006846:Hydrocarbons, Halogenated / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology*; D008235:Lyngbya Toxins / Q000737:chemistry*; D018942:Macrolides / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology*; D008386:Marine Biology; D015394:Molecular Structure; D019906:Nuclear Magnetic Resonance, Biomolecular; D013237:Stereoisomerism
D000970:Antineoplastic Agents; D047630:Depsipeptides; D006846:Hydrocarbons, Halogenated; D008235:Lyngbya Toxins; D018942:Macrolides; C470919:apratoxin C; C410925:lyngbyabellin A