title: Antimalarial, antiviral, and antitoxoplasmosis norsesterterpene peroxide acids from the Red Sea sponge Diacarnus erythraeanus.
abstract: A new norsesterterpene acid, named muqubilone (1), along with the known sigmosceptrellin-B and muqubilin were isolated from the Red Sea sponge Diacarnus erythraeanus. The structure determination of 1 was based primarily on 1D and 2D NMR analyses. Sigmosceptrellin-B exhibits significant in vitro antimalarial activity against Plasmodium falciparum (D6 and W2 clones) with IC(50) values of 1200 and 3400 ng/mL, respectively. Muqubilin and 1 show in vitro antiviral activity against herpes simplex type 1 (HSV-1) with ED(50) values of 7.5 and 30 microg/mL, respectively. Muqubilin and sigmosceptrellin-B display potent in vitro activity against Toxoplasma gondii at a concentration of 0.1 microM without significant toxicity.
authors.affiliation: The Department of Pharmacognosy, and National Center for Natural Products Research, School of Pharmacy, The University of Mississippi, University, Mississippi 38677, USA.
authors.forename: K A
authors.initials: KA
authors.lastname: El Sayed
authors.forename: M T
authors.initials: MT
authors.lastname: Hamann
authors.forename: N E
authors.initials: NE
authors.lastname: Hashish
authors.forename: W T
authors.initials: WT
authors.lastname: Shier
authors.forename: M
authors.initials: M
authors.lastname: Kelly
authors.forename: A A
authors.initials: AA
authors.lastname: Khan
mesh_terms: D000818:Animals; D000962:Antimalarials / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D000981:Antiprotozoal Agents / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D000998:Antiviral Agents / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D018259:Herpesvirus 1, Human / Q000187:drug effects; D010545:Peroxides / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D010963:Plasmodium falciparum / Q000187:drug effects; D011161:Porifera / Q000737:chemistry*; D013729:Terpenes / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D014122:Toxoplasma / Q000187:drug effects*
chemical_list: D000962:Antimalarials; D000981:Antiprotozoal Agents; D000998:Antiviral Agents; D010545:Peroxides; D013729:Terpenes; C430184:muqubilone