title: Cytotoxic alkaloids and antibiotic nordammarane triterpenoids from the marine-derived fungus Aspergillus sydowi.
abstract: Three new diketopiperazine alkaloids, 6-methoxyspirotryprostatin B (1), 18-oxotryprostatin A (2), and 14-hydroxyterezine D (3), with an oxaspiro[4.4]lactam moiety, 14-norpseurotin A (4), and the 29-nordammarane triterpenoid 6beta,16beta-diacetoxy-25-hydroxy-3,7-dioxy-29-nordammara-1,17(20)-dien-21-oic acid (5), as well as 12 known compounds (6- 17), were isolated from the ethyl acetate extract of a marine-derived fungal strain, Aspergillus sydowi PFW1-13. The structures of compounds 1- 5 were elucidated by comprehensive spectroscopic analysis. Compounds 1- 3 exhibit weak cytotoxicity against A-549 cells, with IC 50 values of 8.29, 1.28, and 7.31 microM, respectively. Compound 1 also shows slight cytotoxicity against HL-60 cells, with an IC 50 value of 9.71 microM. Compounds 4 and 5 display significant antimicrobial activities against Escherichia coli, Bacillus subtilis, and Micrococcus lysoleikticus with MICs of 3.74, 14.97, and 7.49 microM and 10.65, 5.33, and 10.65 microM, respectively.
authors.affiliation: Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, People's Republic of China.
authors.forename: Min
authors.initials: M
authors.lastname: Zhang
authors.forename: Wen-Liang
authors.initials: WL
authors.lastname: Wang
authors.forename: Yu-Chun
authors.initials: YC
authors.lastname: Fang
authors.forename: Tian-Jiao
authors.initials: TJ
authors.lastname: Zhu
authors.forename: Qian-Qun
authors.initials: QQ
authors.lastname: Gu
authors.forename: Wei-Ming
authors.initials: WM
authors.lastname: Zhu
mesh_terms: D000900:Anti-Bacterial Agents / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology*; D000970:Antineoplastic Agents / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology*; D001230:Aspergillus / Q000737:chemistry*; D001412:Bacillus subtilis / Q000187:drug effects; D004354:Drug Screening Assays, Antitumor; D004926:Escherichia coli / Q000187:drug effects; D018922:HL-60 Cells; D006801:Humans; D026121:Indole Alkaloids / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology*; D008826:Microbial Sensitivity Tests; D008837:Micrococcus / Q000187:drug effects; D015394:Molecular Structure; D013141:Spiro Compounds / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology*; D014315:Triterpenes / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology*
chemical_list: C531257:14-hydroxyterezine D; C531258:18-oxotryprostatin A; C531255:6-methoxyspirotryprostatin B; D000900:Anti-Bacterial Agents; D000970:Antineoplastic Agents; D026121:Indole Alkaloids; D013141:Spiro Compounds; D014315:Triterpenes