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Increased polysaccharide production and biosynthetic gene expressions in a submerged culture of Ganoderma lucidum by the overexpression of the homologous α-phosphoglucomutase gene

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Abstract

This study aimed to improve the production of polysaccharide by engineering the biosynthetic pathway in Ganoderma lucidum through the overexpression of α-phosphoglucomutase (PGM) gene. PGM is responsible for the linkage between sugar catabolism and sugar anabolism. The effects of PGM gene overexpression on intracellular polysaccharide (IPS) content, extracellular polysaccharide (EPS) production and transcription levels of three genes encoding the enzymes involved in polysaccharide biosynthesis, including PGM, UDP-glucose pyrophosphorylase (UGP), and β-1,3-glucan synthase (GLS), were investigated. The maximum IPS content and EPS production in G. lucidum overexpressing the PGM gene were 23.67 mg/100 mg dry weight and 1.76 g/L, respectively, which were higher by 40.5 and 44.3 % than those of the wild-type strain. The transcription levels of PGM, UGP and GLS were upregulated by 4.77-, 1.51- and 1.53-fold, respectively, in the engineered strain, suggesting that increased polysaccharide biosynthesis may result from a higher expression of those genes.

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Acknowledgments

Financial support from the National Natural Science Foundation of China (31360495), the start-up grant from Kunming University of Science and Technology (KKSY201226107), Department of Science and Technology of Yunnan Province (2012BA015), CNTC (110201201009 BR-03) and Hongyun Honghe Tobacco (Group) Co. Ltd. (HYHH2012HX06) is gratefully acknowledged.

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Authors and Affiliations

  1. Laboratory for Conservation and Utilization of Bio-resources and Key Laboratory for Microbial Resources of the Ministry of Education, Yunnan University, Kunming, 650091, China

    Ming-He Mo

  2. Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming, 650500, China

    Jun-Wei Xu, Sen-Lin Ji, Huan-Jun Li & Jiang-Sheng Zhou

  3. Hongyun Honghe Tobacco (Group) Co. Ltd, Kunming, 650202, China

    Yan-Qing Duan & Li-Zhi Dang

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  1. Jun-Wei Xu
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Correspondence to Jun-Wei Xu or Ming-He Mo.

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J.-W. Xu and S.-L. Ji have contributed equally to this work.

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Xu, JW., Ji, SL., Li, HJ. et al. Increased polysaccharide production and biosynthetic gene expressions in a submerged culture of Ganoderma lucidum by the overexpression of the homologous α-phosphoglucomutase gene. Bioprocess Biosyst Eng 38, 399–405 (2015). https://doi.org/10.1007/s00449-014-1279-1

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  • DOI: https://doi.org/10.1007/s00449-014-1279-1

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