title: Cyclohexadepsipeptides from the insect pathogenic fungus Hirsutella nivea BCC 2594.
abstract: Two new cyclohexadepsipeptides, hirsutatins A (1) and B (2), were isolated from a culture filtrate of the insect pathogenic fungus Hirsutella nivea BCC 2594. Structures of these compounds were elucidated primarily by NMR and mass spectroscopic analyses. The alpha-carbon stereochemistry of 1 was established by HPLC analysis of its acid hydrolysate using a chiral column. Hirsutatin B (2) exhibited activity against the malarial parasite Plasmodium falciparum K1 with an IC50 value of 5.8 microg/mL, while hirsutatin A (1) was inactive at a concentration of 20 microg/mL.
authors.affiliation: National Center for Genetic Engineering and Biotechnology (BIOTEC), Thailand Science Park, 113 Phaholyothin Road, Klong Luang, Pathumthani 12120, Thailand. isaka@biotec.or.th
authors.forename: Masahiko
authors.initials: M
authors.lastname: Isaka
authors.forename: Somporn
authors.initials: S
authors.lastname: Palasarn
authors.forename: Kanlayanee
authors.initials: K
authors.lastname: Sriklung
authors.forename: Kanokarn
authors.initials: K
authors.lastname: Kocharin
mesh_terms: D000818:Animals; D000962:Antimalarials / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D002522:Chlorocebus aethiops; D047630:Depsipeptides / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D004351:Drug Resistance; D006430:Hemiptera; D006999:Hypocreales / Q000737:chemistry*; D020128:Inhibitory Concentration 50; D015394:Molecular Structure; D009169:Mycobacterium tuberculosis / Q000187:drug effects; D019906:Nuclear Magnetic Resonance, Biomolecular; D010963:Plasmodium falciparum / Q000187:drug effects*; D013785:Thailand; D014709:Vero Cells
chemical_list: D000962:Antimalarials; D047630:Depsipeptides; C506501:hirsutatin A; C506502:hirsutatin B