title: Cyclic heptapeptides from the Jamaican sponge Stylissa caribica.
abstract: Two new cyclic heptapeptides, stylisin 1(1) and stylisin 2 (2), were isolated and characterized from the Jamaican sponge Stylissa caribica, in addition to the cyclic heptapeptide phakellistatin 13 (3) and the known bromopyrrole alkaloids sceptrin (4), stevensine (5), and oroidin (6). The new structures were assigned on the basis of 1D and 2D NMR spectroscopic data, as well as chemical methods for the elucidation of the absolute configuration of amino acids. The peptides and alkaloids have been evaluated for their antimicrobial, antimalarial, anticancer, anti-HIV-1, anti-Mtb, and antiinflammatory activities.
authors.affiliation: Department of Pharmacognosy, Pharmacology, Chemistry & Biochemistry and National Center for Natural Products Research, The University of Mississippi, University, MS 38677, USA.
authors.forename: Rabab
authors.initials: R
authors.lastname: Mohammed
authors.forename: Jiangnan
authors.initials: J
authors.lastname: Peng
authors.forename: Michelle
authors.initials: M
authors.lastname: Kelly
authors.forename: Mark T
authors.initials: MT
authors.lastname: Hamann
mesh_terms: D000818:Animals; D019380:Anti-HIV Agents / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D000890:Anti-Infective Agents / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology*; D000893:Anti-Inflammatory Agents / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology*; D000962:Antimalarials / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology*; D000970:Antineoplastic Agents / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D000995:Antitubercular Agents / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology*; D004354:Drug Screening Assays, Antitumor; D007563:Jamaica; D015394:Molecular Structure; D010456:Peptides, Cyclic / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D011161:Porifera / Q000737:chemistry*
chemical_list: D019380:Anti-HIV Agents; D000890:Anti-Infective Agents; D000893:Anti-Inflammatory Agents; D000962:Antimalarials; D000970:Antineoplastic Agents; D000995:Antitubercular Agents; D010456:Peptides, Cyclic