Abstract
An inducible promoter is a useful tool for the controlled expression of a given gene. In this report, we describe galactose-dependent promoters for potential use in an oleaginous fungus Mortierella alpina. We cloned the putative promoter regions of two genes encoding galactose metabolic enzymes, GAL1 and GAL10, from the genome of M. alpina 1S-4. The β-glucuronidase (GUS) reporter gene assay in M. alpina 1S-4 revealed that regulation of these promoters was dependent on the presence of galactose in the medium both with and without other sugars. With the GAL10 promoter, an approximately 50-fold increase of GUS activity was demonstrated by addition of galactose into the culture media at any cultivation phase. The 5′ deletion analysis of the GAL10 promoter revealed that a promoter region of over 2,000 bp length was required for its high-level activity and sufficient inducible response. Significantly, this is the first report of inducible promoters of zygomycetes. The GAL10 promoter will be a valuable tool for gene manipulation in M. alpina 1S-4.
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Acknowledgments
This work was partially supported by Institute for Fermentation, Osaka (IFO) and the Program for Promotion of Basic and Applied Researches for Innovations in Bio-oriented Industry (BRAIN) to J.O.; Advanced Low Carbon Technology Research and Development Program (ALCA) to J.S.; and Grants-in-Aid for Scientific Researches (No. 22380051) from the Ministry of Education, Science, Sports, and Culture of Japan to E.S.
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Communicated by Stefan Hohmann.
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Okuda, T., Ando, A., Sakuradani, E. et al. Characterization of galactose-dependent promoters from an oleaginous fungus Mortierella alpina 1S-4. Curr Genet 60, 175–182 (2014). https://doi.org/10.1007/s00294-014-0422-5
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DOI: https://doi.org/10.1007/s00294-014-0422-5