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Filamentous fungi are important model systems for understanding eukaryotic cellular processes, including the study of protein expression. A salient feature of fungi is the ability of the protein-processing machinery to perform all of the extensive posttranslational modifications needed in the complex world of eukaryotic organisms, making them great hosts for production of eukaryotic proteins. In the model organism Neurospora crassa, several regulatable promoters have been used for heterologous gene expression but all suffer from leaky expression absent stimuli or an inability to induce protein expression at levels greater than those seen in vivo. To increase and better control in vivo protein expression in Neurospora, we have harnessed the light-induced vvd promoter. vvd promoter-driven mRNA expression is dependent upon light, shows a graded response, and is rapidly shut off when returned to the dark. The vvd promoter is a highly tunable and regulatable system, which could be a useful instrument for those interested in efficient and controllable gene expression.

Light-Inducible System for Tunable Protein Expression inNeurospora crassa