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Biosci Biotechnol Biochem ; 80(9): 1792-801, 2016 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-27280333

RESUMEN

Promoter shutoff is a general method for analyzing essential genes, but in the fungus Aspergillus oryzae, no tightly repressed promoters have been reported. To overcome the current limitations of conditional promoters, we examined sorbitol- and galactose-responsive genes using microarrays to identify regulatable genes with only minor physiological and genetic effects. We identified two sorbitol-induced genes (designated as sorA and sorB), cloned their promoters, and built a regulated egfp and brlA expression system. Growth medium-dependent enhanced green fluorescence protein (EGFP) fluorescence and conidiation were confirmed for egfp and brlA under the control of their respective promoters. We also used this shutoff system to regulate the essential rhoA, which demonstrated the expected growth inhibition under repressed growth conditions. Our new sorbitol promoter shutoff system developed can serve as a valuable new tool for essential gene analyses of filamentous fungi.


Asunto(s)
Aspergillus oryzae/genética , Proteínas Portadoras/genética , Proteínas Fúngicas/genética , Oxidorreductasas/genética , Sorbitol/metabolismo , Aspergillus oryzae/crecimiento & desarrollo , Aspergillus oryzae/metabolismo , Proteínas Fúngicas/biosíntesis , Galactosa/metabolismo , Regulación Fúngica de la Expresión Génica , Proteínas Fluorescentes Verdes/genética , Regiones Promotoras Genéticas , Esporas Fúngicas/genética , Esporas Fúngicas/crecimiento & desarrollo , Proteína de Unión al GTP rhoA/genética
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