title: New cyclic peptides with cytotoxic activity from the ascidian Lissoclinum patella.
abstract: The isolation and structures of a new patellamide (patellamide D) and two new lissoclinamides (lissoclinamides 4 and 5) from the aplousobranch ascidian Lissoclinum patella are described. Structures were determined largely by using two-dimensional NMR techniques and mass spectrometry. These peptides and other members of the patellamide and lissoclinamide families that have been reported previously are found within the obligate algal symbiont of the genus Prochloron. The cytotoxicities of the compounds toward fibroblast and tumor cell lines are reported. One of these compounds, lissoclinamide 4, is markedly more toxic than other members of the family. Structure-activity relationships are discussed.
authors.affiliation: Department of Biochemistry, University of Queensland, St. Lucia, Australia.
authors.forename: B M
authors.initials: BM
authors.lastname: Degnan
authors.forename: C J
authors.initials: CJ
authors.lastname: Hawkins
authors.forename: M F
authors.initials: MF
authors.lastname: Lavin
authors.forename: E J
authors.initials: EJ
authors.lastname: McCaffrey
authors.forename: D L
authors.initials: DL
authors.lastname: Parry
authors.forename: A L
authors.initials: AL
authors.lastname: van den Brenk
authors.forename: D J
authors.initials: DJ
authors.lastname: Watters
mesh_terms: D000818:Animals; D002461:Cell Line, Transformed; D002470:Cell Survival / Q000187:drug effects; D002851:Chromatography, High Pressure Liquid; D004247:DNA / Q000096:biosynthesis; D005347:Fibroblasts / Q000166:cytology / Q000187:drug effects / Q000378:metabolism; D006801:Humans; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D008968:Molecular Conformation; D015394:Molecular Structure; D010456:Peptides, Cyclic / Q000302:isolation & purification* / Q000494:pharmacology; D013329:Structure-Activity Relationship; D014407:Tumor Cells, Cultured; D001749:Urinary Bladder Neoplasms / Q000378:metabolism / Q000473:pathology; D014561:Urochordata / Q000032:analysis*
chemical_list: D010456:Peptides, Cyclic; C059972:patellamide D; D004247:DNA