In addition to CAF-603, 14-hydroxy CAF-603 (trichocarane B), 7-β-hydroxy CAF-603, and trichocarane A, eight new carotane sesquiterpenes, trichocarotins A-H, and one new cadinane sesquiterpene, trichocadinin A, were isolated from the culture of Trichoderma virens Y13-3, obtained from the surface of a marine red alga. Their structures and relative configurations were unambiguously assigned by interpretation of 1D/2D NMR and MS data, and their absolute configurations were established by X-ray diffraction or ECD spectra aided by quantum chemical calculations. These compounds represent two rarely occurring sesquiterpene types from filamentous fungi, and six of them feature potent inhibition against some marine plankton species.
1997-09-24·European Journal of Pharmacology3区 · 医学
Ca2+-entry blockade by CAF603, a carotane sesquiterpene isolated from Trichoderma virens
3区 · 医学
作者: Suarez-Kurtz, Guilherme ; Nascimento, Jose H. M. ; Ondeyka, John G. ; Kaczorowski, Gregory J.
Isometric tension recordings and patch-clamp methods were combined to explore the functional effects and mechanisms of action of 8-daucene-3,4-diol (CAF603), a carotane sesquiterpene isolated from the fungus Trichoderma virens. CAF603 (1-100 microM) inhibited the spontaneous motility of guinea-pig portal vein, duodenum and ileum, and the Ca2+-induced tension of depolarized ileum strips. These effects were not antagonized by either iberiotoxin or glyburide. CAF603 increased the spontaneous motility of guinea-pig detrusor muscle, but inhibited the contraction induced by high-KCl, depolarizing salines. CAF603 blocked L-type Ca2+ channel currents of rabbit cardiac myocytes. It is proposed that Ca2+-entry blockade accounts for the inhibitory effects of CAF603 on smooth muscle contractility, whereas the stimulation of spontaneous motility of detrusor muscle is ascribed to blockade of Ca2+-activated K+ (BKCa) channel currents. The latter interpretation is consistent with the allosteric modulation of charybdotoxin binding to BKCa in smooth muscle membranes [Lee et al., 1995. J. Nat. Prod. 58, 1822-1828].
1990-10-31·Journal of Natural Products2区 · 生物学
CAF-603: a new antifungal carotane sesquiterpene. Isolation and structure elucidation
A new antifungal compound, CAF-603, was isolated from the culture broth of Gliocladium virens IFO 9166. The structure of compound 1 has been elucidated by spectroscopic methods that also allowed the relative stereochemistry to be assigned. CAF-603  was active against yeasts and dermatophytes.