Abstract
The promoter of glyceraldehyde-3-phosphate dehydrogenase (gpd) gene from Aspergillus nidulans (PgpdA) is widely used to direct expression of target genes constitutively in fungi. However, in some species, a heterogeneous promoter is found to be of low efficiency. To obtain a high-efficiency promoter for transformation of Beauveria bassiana, an entomopathogenic fungus widely used as an mycoinsecticide, a glyceraldehyde-3-phosphate dehydrogenase gene (Bbgpd) promoter, was cloned and characterized. Four deletion constructs (−2118, −1153, −726, and −354) of the 5′-upstream sequence of Bbgpd linked to a bar::gus fusion gene (phosphinothricin-resistance::β-glucuronidase fused gene), which were used as selected marker gene and report gene, respectively, were generated. GUS activities of transgenic strains harboring −726, −1153, and −2118 deletion constructs were much stronger than that of the promoter of Aspergillus nidulans gpdA (PgpdA), with a twofold to threefold increase over that in the PgpdA construct. The −726 fragment was necessary to direct GUS expression in B. bassiana. No −354 transgenic progenies were obtained, possibly because it failed to initiate the transcription of bar::gus fusion gene. A remarkable increase of GUS activity was found between the −1153 and −726 constructs, indicating that some active transcriptional elements were located in this region. With a high expression level and relatively short sequence, PBbgpd can be used to drive target genes in B. bassiana transgenic research.
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This work was supported by China National Basic Research and Development Program (2003CB114203), Hi-Tech Research and Development Program of China (2006AA10A212), and the Doctoral Student Research Foundation of Southwest University in China (2006051).
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Liao, Xg., Fang, Wg., Zhang, Yj. et al. Characterization of a Highly Active Promoter, PBbgpd, in Beauveria bassiana . Curr Microbiol 57, 121–126 (2008). https://doi.org/10.1007/s00284-008-9163-3
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DOI: https://doi.org/10.1007/s00284-008-9163-3