O ácido traquilobânico (2) foi incubado com Rhizopus stolonifer, com o objetivo de se sintetizar novos derivados diterpênicos. Após vinte dias, quatro metabólitos foram extraídos, isolados e caracterizados, dos quais dois apresentaram-se hidroxilados nas posições 7β (3) e 17 (5). Dois derivados rearranjados também foram isolados, os ácidos ent-16β-hidroxi-caur-11-en-19-óico (4) e 9α,16β-diidrox...

Annonaceae aporphine alkaloids, of which liriodenine is the most abundant, have not been extensively studied from a biological standpoint. The goal of this study was to investigate the role of liriodenine in antimicrobial defense during early developmental stages in Annona diversifolia. The fungi Rhizopus stolonifer and Aspergillus glaucus, which are responsible for seed deterioration, were iso...

The starch-hydrolysing enzyme GA (glucoamylase) from Rhizopus oryzae is a commonly used glycoside hydrolase in industry. It consists of a C-terminal catalytic domain and an N-terminal starch-binding domain, which belong to the CBM21 (carbohydrate-binding module, family 21). In the present study, a molecular model of CBM21 from R. oryzae GA (RoGACBM21) was constructed according to PSSC (progress...

Fluorescence studies on the interaction, with porcine pepsin, of oligopeptides bearing a mansyl (Mns, 6-(N-methylanilino)-2-naphthalenesulfonyl) or dansyl (Dns, 5-dimethylaminonaphthalene-1-sulfonyl) group at the NH2 or COOH terminus have provided further evidence showing that the probe group is drawn into the extended active site largely as a consequence of the specific binding of the peptide ...

Mucormycosis, a fatal opportunistic infection in immunocompromised hosts, is caused by fungi belonging to the order Mucorales. Early diagnosis based on exact identification and multidisciplinary treatments is critical. However, identification of Mucorales fungi is difficult and often delayed, resulting in poor prognosis. This study aimed to compare the results of phenotypic and molecular identi...

The methanol-regulated alcohol oxidase promoter (PAOX1) of Pichia pastoris is one of the strongest promoters for heterologous gene expression in this methylotrophic yeast. Although increasing gene dosage is one of the most common strategies to increase recombinant protein productivities, the increase of gene dosage of Rhizopus oryzae lipase (ROL) in P. pastoris has been previously shown to redu...

Lactic acid, commonly used in food, chemical and pharmaceutical industries, has recently received much attention for the production of biodegradable plastics. In this study, Rhizopus oryzae MTCC 8784 was used to convert starch into optically pure L-Lactic acid. Effect of time, pH, addition of calcium carbonate and starch concentration were analyzed using shaker flasks in order optimize the L-la...

BACKGROUND Waxes are esters of long-chain fatty acids and long-chain alcohols. Their principal natural sources are animals (sperm whale oil) and vegetables (jojoba) which are expensive and not easily available. Wax esters synthesized by enzymatic transesterification, using palm stearin as raw material, can be considered as an alternative to natural ones. RESULTS Palm stearin is a solid fracti...

Mucormycosis is a fungus infection which generally occurs in association with metabolic disorders, most frequently diabetes mellitus. The fungus has only recently been identified in culture when the phycomycetes Rhizopus oryzae and Rhizopus arrhizus were recovered from two diabetic patients with cerebral mucormycosis."'0 With these and other species of Mucorales, lesions closely resembling cere...

The synthesis of methyl butyrate and octyl acetate through immobilized Rhizopus oryzae NRRL 3562 lipase mediated transesterification was studied under solvent-free conditions. The effect of different transesterification variables, namely, molarity of alcohol, reaction time, temperature, agitation, addition of water, and enzyme amount on molar conversion (%) was investigated. A maximum molar con...