RESUMEN
A new antibiotic termed cladospolide D was isolated along with the known cladospolides A and B from the fermentation broth of Cladosporium sp. FT-0012 by solvent extraction, ODS column chromatography and preparative HPLC. The structure of cladospolide D was deduced to be (E)-2-dodecen-5-hydroxy-11-olide-4-one. Cladospolide D showed antifungal activity against Pyricularia oryzae and Mucor racemosus.
Asunto(s)
Antibacterianos/biosíntesis , Antibacterianos/química , Cladosporium/metabolismo , Macrólidos , Antibacterianos/farmacología , Antifúngicos/química , Antifúngicos/farmacología , Cromatografía Líquida de Alta Presión , Cladosporium/crecimiento & desarrollo , Cladosporium/ultraestructura , Fermentación , Microscopía Electrónica de Rastreo , Hongos Mitospóricos/efectos de los fármacos , Estructura Molecular , Mucor/efectos de los fármacos , Staphylococcus aureus/efectos de los fármacos , Xanthomonas/efectos de los fármacosRESUMEN
[structure: see text] Total synthesis of nafuredin, a selective NADH-fumarate reductase inhibitor, has been accomplished by a convergent approach. The C1-C8 and C9-C18 segments were derived efficiently from D-glucose and (S)-(-)-2-methyl-1-butanol, respectively, coupled by stereoselective Julia olefination, and converted to nafuredin.
Asunto(s)
Antihelmínticos/síntesis química , Inhibidores Enzimáticos/síntesis química , Oxidorreductasas actuantes sobre Donantes de Grupo CH-CH , Oxidorreductasas/antagonistas & inhibidores , Pironas/síntesis química , Glucosa/química , Pentanoles/química , EstereoisomerismoRESUMEN
A novel compound, nafuredin, was isolated as an inhibitor of anaerobic electron transport (NADH-fumarate reductase). It was obtained from culture broth of Aspergillus niger FT-0554 isolated from a marine sponge. The structure was elucidated as an epoxy-delta-lactone with an attached methylated olefinic side chain on the basis of spectral analysis.
Asunto(s)
Aspergillus niger/metabolismo , Inhibidores Enzimáticos/metabolismo , Inhibidores Enzimáticos/farmacología , Oxidorreductasas actuantes sobre Donantes de Grupo CH-CH , Oxidorreductasas/antagonistas & inhibidores , Pironas/metabolismo , Pironas/farmacología , Aspergillus niger/clasificación , Aspergillus niger/ultraestructura , Fenómenos Químicos , Química Física , Inhibidores Enzimáticos/química , Fermentación , Espectroscopía de Resonancia Magnética , Microscopía Electrónica de Rastreo , Estructura Molecular , Pironas/químicaRESUMEN
Infections with parasitic helminths are important causes of morbidity and mortality worldwide. New drugs that are parasite specific and minimally toxic to the host are needed to counter these infections effectively. Here we report the finding of a previously unidentified compound, nafuredin, from Aspergillus niger. Nafuredin inhibits NADH-fumarate reductase (complexes I + II) activity, a unique anaerobic electron transport system in helminth mitochondria, at nM order. It competes for the quinone-binding site in complex I and shows high selective toxicity to the helminth enzyme. Moreover, nafuredin exerts anthelmintic activity against Haemonchus contortus in in vivo trials with sheep. Thus, our study indicates that mitochondrial complex I is a promising target for chemotherapy, and nafuredin is a potential lead compound as an anthelmintic isolated from microorganisms.
Asunto(s)
Antihelmínticos/farmacología , Aspergillus niger/química , Haemonchus/efectos de los fármacos , Haemonchus/enzimología , Mitocondrias/enzimología , Oxidorreductasas actuantes sobre Donantes de Grupo CH-CH , Oxidorreductasas/antagonistas & inhibidores , Pironas/farmacología , Administración Oral , Animales , Antihelmínticos/administración & dosificación , Antihelmínticos/química , Antihelmínticos/uso terapéutico , Ascaris suum/efectos de los fármacos , Ascaris suum/enzimología , Transporte de Electrón/efectos de los fármacos , Heces/parasitología , Hemoncosis/tratamiento farmacológico , Concentración 50 Inhibidora , Cinética , Mitocondrias/efectos de los fármacos , Estructura Molecular , Oxidorreductasas/metabolismo , Pironas/administración & dosificación , Pironas/química , Pironas/uso terapéutico , Ovinos/parasitología , Factores de Tiempo , Ubiquinona/análogos & derivados , Ubiquinona/metabolismoRESUMEN
A new chitinase inhibitor, designated as argadin (1), was isolated from the cultured broth of a fungal strain FO-7314. The strain was identified as Clonostachys sp. from the morphological characteristics. Argadin was purified from the cultured mycelium by a combination of cation exchange, adsorption and gel filtration chromatographic methods. The structure of argadin was elucidated as cyclo(Nomega-acetyl-L-arginyl-D-prolyl-homoseryl-histidyl-L- 2-aminoadipyl) in which homoseryl gamma-methylene bonded to histidyl alpha-amino residue. The IC50 value of argadin against Lucilia cuprina (blowfly) chitinase was 150 nM at 37 degrees C and 3.4 nM at 20 degrees C. Argadin arrested the moult of cockroach larvae upon injection into the ventral abdominal part.
Asunto(s)
Quitinasas/antagonistas & inhibidores , Inhibidores Enzimáticos/aislamiento & purificación , Hongos Mitospóricos/química , Péptidos Cíclicos/aislamiento & purificación , Animales , Inhibidores Enzimáticos/química , Microscopía Electrónica , Hongos Mitospóricos/ultraestructura , Estructura Molecular , Péptidos Cíclicos/química , Análisis EspectralRESUMEN
A new chitinase inhibitor, named argifin, was isolated from the cultured broth of a fungal strain FTD-0668. The strain was identified as Gliocladium sp. from morphological characteristics. The IC50 value of argifin against Lucilia cuprina chitinase was 3.7 microM. Argifin arrested the moult of cockroach larvae upon injection into the ventral abdominal part.
Asunto(s)
Quitinasas/antagonistas & inhibidores , Cucarachas/efectos de los fármacos , Inhibidores Enzimáticos/metabolismo , Inhibidores Enzimáticos/farmacología , Hongos Mitospóricos/metabolismo , Péptidos Cíclicos/metabolismo , Péptidos Cíclicos/farmacología , Animales , Bacterias/efectos de los fármacos , División Celular/efectos de los fármacos , Línea Celular/efectos de los fármacos , Cucarachas/crecimiento & desarrollo , Relación Dosis-Respuesta a Droga , Evaluación Preclínica de Medicamentos/métodos , Concentración 50 Inhibidora , Larva/efectos de los fármacos , Pruebas de Sensibilidad Microbiana , Hongos Mitospóricos/clasificaciónRESUMEN
The mutant of Penicillium sp. FO-4259, an arisugacins A and B producing strain, was found to produce a series of metabolites, designated arisugacins C, D, E, F, G and H, which were structurally related to arisugacins A and B. These compounds were isolated from the culture broth and the physico-chemical and biological properties were examined. The IC50 values of arisugacins C and D against acetylcholinesterase (AChE) were 2.5 microM and 3.5 microM, respectively. However arisugacins E, F, G and H did not inhibit AChE at 100 microM. Though they showed only weak or no activity against AChE compared with arisugacins A and B, they may be useful for the study of the structure-activity relationship.
Asunto(s)
Inhibidores de la Colinesterasa/química , Inhibidores de la Colinesterasa/aislamiento & purificación , Piranos/farmacología , Inhibidores de la Colinesterasa/metabolismo , Humanos , Espectroscopía de Resonancia Magnética , Estructura Molecular , Penicillium , Piranos/química , Piranos/aislamiento & purificación , Relación Estructura-ActividadRESUMEN
Phomopsis sp. FT-0211, a soil isolate, was found to produce inhibitors of lipid droplet formation in mouse peritoneal macrophages. Structurally related new compounds designated phenochalasins A and B were isolated from the fermentation broth of the producing strain by solvent extraction, ODS column chromatography and preparative HPLC. Phenochalasin A caused a dose-dependent reduction in the number and size of lipid droplets in macrophages without any cytotoxic effect at least up to 20 microm. On the other hand, phenochalasin B showed inhibition of lipid droplet formation with a severe cytotoxic effect on macrophages.
Asunto(s)
Indoles/aislamiento & purificación , Indoles/farmacología , Lactonas/aislamiento & purificación , Lactonas/farmacología , Metabolismo de los Lípidos , Macrófagos Peritoneales/efectos de los fármacos , Animales , Células Cultivadas , Cromatografía Líquida de Alta Presión , Relación Dosis-Respuesta a Droga , Fermentación , Macrófagos Peritoneales/metabolismo , Ratones , Pruebas de Sensibilidad Microbiana , Estructura Molecular , Relación Estructura-ActividadRESUMEN
Gliocladium roseum KF-1040, a marine isolate, was found to produce a series of new inhibitors of diacylglycerol acyltransferase (DGAT). Four active compounds, designated roselipins 1A, 1B, 2A and 2B, were isolated from the fermentation broth of the producing strain by solvent extraction, ODS column chromatography and preparative HPLC. The highest production of roselipins was observed when cultured in the medium containing natural sea water. Roselipins inhibit DGAT activity with IC50 values of 15 approximately 22 microM in an enzyme assay system using rat liver microsomes.
Asunto(s)
Aciltransferasas/antagonistas & inhibidores , Inhibidores Enzimáticos/aislamiento & purificación , Inhibidores Enzimáticos/farmacología , Ácidos Grasos/aislamiento & purificación , Ácidos Grasos/farmacología , Hongos Mitospóricos/metabolismo , Monosacáridos/aislamiento & purificación , Monosacáridos/farmacología , Animales , Diacilglicerol O-Acetiltransferasa , Evaluación Preclínica de Medicamentos , Inhibidores Enzimáticos/metabolismo , Ácidos Grasos/metabolismo , Fermentación , Concentración 50 Inhibidora , Pruebas de Sensibilidad Microbiana , Microscopía Electrónica de Rastreo , Hongos Mitospóricos/clasificación , Hongos Mitospóricos/ultraestructura , Monosacáridos/metabolismo , RatasAsunto(s)
Inhibidores de Caspasas , Ciclopentanos/química , Ciclopentanos/farmacología , Inhibidores de Cisteína Proteinasa/química , Inhibidores de Cisteína Proteinasa/farmacología , Trichoderma/metabolismo , Ciclopentanos/aislamiento & purificación , Inhibidores de Cisteína Proteinasa/aislamiento & purificación , Compuestos Epoxi/química , Compuestos Epoxi/aislamiento & purificación , Compuestos Epoxi/farmacología , Fermentación , Concentración 50 Inhibidora , Espectroscopía de Resonancia Magnética , Estructura Molecular , Espectrometría de Masa Bombardeada por Átomos Veloces , Trichoderma/clasificaciónRESUMEN
Beauveria sp. FO-6979, a soil isolate, was found to produce inhibitors of lipid droplet formation in mouse peritoneal macrophages. A new compound beauveriolide III was isolated along with a known compound beauveriolide I from the fermentation broth of the producing strain by solvent extraction, ODS column chromatography, silica gel column chromatography and preparative HPLC. Beauveriolides I and III caused a reduction in the number and size of cytosolic lipid droplets in macrophages at 10 microM without any cytotoxic effect on macrophages.
Asunto(s)
Antibacterianos/farmacología , Ascomicetos/metabolismo , Depsipéptidos , Metabolismo de los Lípidos , Macrófagos Peritoneales/metabolismo , Péptidos Cíclicos/farmacología , Animales , Antibacterianos/biosíntesis , Antibacterianos/aislamiento & purificación , Antinematodos/farmacología , Ascomicetos/clasificación , Ascomicetos/ultraestructura , Bacterias/efectos de los fármacos , Femenino , Fermentación , Técnicas In Vitro , Insecticidas/farmacología , Macrófagos Peritoneales/efectos de los fármacos , Ratones , Ratones Endogámicos ICR , Pruebas de Sensibilidad Microbiana , Microscopía Electrónica de Rastreo , Péptidos Cíclicos/biosíntesis , Péptidos Cíclicos/aislamiento & purificaciónAsunto(s)
Arteriosclerosis/tratamiento farmacológico , Proteínas Portadoras/antagonistas & inhibidores , Ésteres del Colesterol/farmacología , Fusarium/metabolismo , Glicoproteínas , Ésteres del Ácido Sulfúrico/farmacología , Animales , Proteínas de Transferencia de Ésteres de Colesterol , Fermentación , Humanos , Ratones , Ratones TransgénicosRESUMEN
Funalenone, a phenalene compound that inhibits type I collagenase (MMP-1), was isolated from mycelium of Aspergillus niger FO-5904 by solvent extaction, ODS column chromatography, Sephadex LH-20 column chromatography and reversed phase HPLC. Funalenone inhibited 50% of type I collagenase activity at a concentration of 170 microM, but inhibited 18.3% and 38.7% against 72 kDa and 92 kDa type IV collagenase, respectively, at a concentration of 400 microM.
Asunto(s)
Aspergillus niger/metabolismo , Cetonas/aislamiento & purificación , Inhibidores de la Metaloproteinasa de la Matriz , Compuestos Policíclicos/aislamiento & purificación , Inhibidores de Proteasas/aislamiento & purificación , Aspergillus niger/clasificación , Bacterias/efectos de los fármacos , Fermentación , Cetonas/química , Cetonas/farmacología , Compuestos Policíclicos/química , Compuestos Policíclicos/farmacología , Inhibidores de Proteasas/química , Inhibidores de Proteasas/farmacologíaRESUMEN
Penicillium sp. FO-5637, a soil isolate, was found to produce a series of inhibitors of cholesteryl ester transfer protein (CETP). Novel active compounds, designated erabulenols A and B, were isolated from the fermentation broth of the producing strain by solvent extraction, ODS column chromatography and HPLC. Erabulenols A and B inhibit human CETP activity with IC50 values of 47.7 and 58.2 microM in an in vitro assay system containing 200 microM BSA, respectively.
Asunto(s)
Proteínas Portadoras/antagonistas & inhibidores , Ésteres del Colesterol/metabolismo , Diterpenos , Furanos , Glicoproteínas , Penicillium/química , Triglicéridos/metabolismo , Triterpenos , Antibacterianos/biosíntesis , Antibacterianos/aislamiento & purificación , Antibacterianos/farmacología , Bacterias/efectos de los fármacos , Proteínas de Transferencia de Ésteres de Colesterol , Cromatografía Líquida de Alta Presión , Diterpenos/aislamiento & purificación , Diterpenos/metabolismo , Diterpenos/farmacología , Hongos/efectos de los fármacos , Furanos/aislamiento & purificación , Furanos/metabolismo , Furanos/farmacología , Humanos , Penicillium/clasificación , Penicillium/crecimiento & desarrollo , Penicillium/metabolismo , Triterpenos/aislamiento & purificación , Triterpenos/metabolismo , Triterpenos/farmacologíaRESUMEN
In the course of our screening program for artemisinin-like antimalarial compounds from microorganisms, seven fungal metabolites such as radicicol and heptelidic acid were identified as active compounds. Some of them exhibited antimalarial activity in vitro against the human malaria parasite Plasmodium falciparum to the extent of approximately 1/10 as potent as artemisinin. Radicicol was moderately active in vivo against Plasmodium berghei in mice.
Asunto(s)
Antifúngicos/farmacología , Antimaláricos/farmacología , Lactonas/farmacología , Animales , Fermentación , Humanos , Macrólidos , Ratones , Plasmodium berghei/efectos de los fármacos , Plasmodium falciparum/efectos de los fármacos , Plasmodium falciparum/aislamiento & purificación , Sesquiterpenos/farmacología , Relación Estructura-ActividadRESUMEN
Novel brominated and halogen-less azaphilone (oxoisochromane) derivatives, 5-bromoochrephilone and dechloroisochromophilone IV, and known derivatives, dechloroisochromophilone III and isorotiorin, were isolated from the culture broth of a producing organism of isochromophilones I and II (azaphilones inhibiting gp120-CD4 binding), Penicillium multicolor FO-2338, fermented in a medium containing potassium bromide. Nineteen azaphilone-related compounds isolated from the above strain and from other fungi were tested for the inhibition of gp120-CD4 binding and the structure-activity relationship is discussed. Consequently, 5-bromoochrephilone is the strongest inhibitor (IC50, 2.5 microM). A halogen atom at C-5, a proton at C-8 and a diene structure in C-3 side chain of 6-oxoisochromane ring are necessary for gp120-CD4 binding.
Asunto(s)
Benzopiranos/aislamiento & purificación , Benzopiranos/farmacología , Antígenos CD4/metabolismo , Proteína gp120 de Envoltorio del VIH/metabolismo , Hidrocarburos Bromados/aislamiento & purificación , Hidrocarburos Bromados/farmacología , Benzopiranos/química , Fermentación , Penicillium , Estereoisomerismo , Relación Estructura-ActividadRESUMEN
Oxidation of lincomycin with dimethyldioxirane resulted in the sulfoxide-glycosides 3a and 3b, whose treatment with osmium tetraoxide and N-methylmorpholine-N-oxide afforded the same sulfone; 4. According to FAB-MS and CD investigations, the absolute configuration of the sulfur atom in 3a and 3b is R and S, respectively. The new, unsaturated antibiotic analog (6) derived from clindamycin exists in the 4C1 conformation. The antibiotic activities of the synthesized compounds were also studied.
Asunto(s)
Antibacterianos/química , Antibacterianos/farmacología , Lincomicina/análogos & derivados , Sulfonas/química , Sulfonas/farmacología , Sulfóxidos/química , Sulfóxidos/farmacología , Antibacterianos/síntesis química , Bacterias/efectos de los fármacos , Clindamicina/química , Lincomicina/síntesis química , Lincomicina/química , Lincomicina/farmacología , Espectroscopía de Resonancia Magnética , Pruebas de Sensibilidad Microbiana , Estructura Molecular , Oxidación-Reducción , Sulfonas/síntesis química , Sulfóxidos/síntesis químicaRESUMEN
Aspergillus sp. FO-4282 was found to produce two new components of the aspochalasins. Their structures were determined by spectroscopic analyses.