The Journal of General and Applied Microbiology
Online ISSN : 1349-8037
Print ISSN : 0022-1260
ISSN-L : 0022-1260
Short Communications
High-level heterologous protein production using an attenuated selection marker in Aspergillus sojae
Yasuko ArakiMasanobu YuzukiYosuke MasakariAtsushi SatoKeiko GomiSeiichi Hara
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Supplementary material

2021 Volume 67 Issue 2 Pages 77-80


Filamentous fungi, including Aspergillus sojae, are essential for the industrial production of enzymes. Although multi-copy introduction of a gene encoding the protein of interest is useful for increasing protein production, this method has not been established in the case of filamentous fungi. In this study, we aimed to establish an efficient system for multi-copy chromosomal integration and high-level expression of a heterologous gene in A. sojae using an attenuated selectable marker. Consequently, by truncating the promoter region of selectable markers, we efficiently introduced multiple copies of a heterologous gene and enhanced the rate of high-level protein-production in the strains. Since the multi-copy strains obtained in this study maintained high productivity even in a non-selective medium, this system could be applicable for industrial protein production.

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© 2021, Applied Microbiology, Molecular and Cellular Biosciences Research Foundation
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