Abstract
Based on the genomic sequence and cDNA library screening, the cDNA sequence encoding an α-amylase was cloned from the filamentous white-rot fungus Phanerochaete chrysosporium and designated as pcamy1. Alignment results showed that the predicted protein has up to 43% amino acid homology to the known α-amylases in other organisms and is close to those from some filamentous fungi. Under nitrogen-starvation condition, the transcription of pcamy1 was accordingly upregulated or downregulated when soluble starch or glucose is sole carbon source. Addition of oxygen to nitrogen-limited media led to pcamy1 transcription and removal of glucose metabolic repression. The result indicated that the pcamy1 transcript was not only regulated by nutrients such as the carbon source but also by the cultivation environment, such as oxygen. This coordinate-regulatory model is likely common in P. chrysosporium. The expressed product of this gene in Escherichia coli could hydrolyze soluble starch, and its enzymatic activity was determined. As far as we know, this is the first report about cloning and expression study on the α-amylase in P. chrysosporium.
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Acknowledgments
This work was supported by the National Science of China (Grant No. 30470984). gpd primers are courtesy of M-F. Jiang, Southwest University of Nationalities. We also thank T. Zhang at the University of Electronic Science and Technology of China for drawing three-dimensional structures.
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Wu, B., Hu, GK., Feng, H. et al. Cloning and Expression of an α-Amylase Gene from Phanerochaete chrysosporium . Curr Microbiol 55, 105–113 (2007). https://doi.org/10.1007/s00284-006-0600-x
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DOI: https://doi.org/10.1007/s00284-006-0600-x