Abstract
Glycosylphosphatidylinositol (GPI)-anchored glycoproteins have diverse intrinsic functions in yeasts, and they also have different uses in vitro. The GPI-modified cell wall proteins GCW21, GCW51, and GCW61 of Pichia pastoris were chosen as anchoring proteins to construct co-expression strains in P. pastoris GS115. The hydrolytic activity and the amount of Candida antarctica lipase B (CALB) displayed on cell surface increased significantly following optimization of the fusion gene dosage and combination of the homogeneous or heterogeneous cell wall proteins. Maximum CALB hydrolytic activity was achieved at 4920 U/g dry cell weight in strain GS115/CALB-GCW (51 + 51 + 61 + 61) after 120 h of methanol induction. Changes in structural morphology and the properties of the cell surfaces caused by co-expression of fusion proteins were observed by transmission electron microscopy (TEM) and on plates containing cell-wall-destabilizing reagent. Our results suggested that both the outer and inner cell layers were significantly altered by overexpression of GPI-modified cell wall proteins. Interestingly, quantitative analysis of the inner layer components showed an increase in β-1,3-glucan, but no obvious changes in chitin in the strains overexpressing GPI-modified cell wall proteins.
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Acknowledgements
The authors thank Jie He, Shufeng Sun, and Matthew Reynolds at the Wadsworth Center for their assistance in yeast cell growth, specimen preparation, and electron microscopy. This work was supported in whole by the grants to Ying Lin from, the China National High Technology Research and Development Program (863-2012AA022205), High Technology Research and Development of Guangdong Province (2012A080800013), and The Recruitment Program of Leading Talents in Innovation and Entrepreneurship of Guangzhou (LCY201322), and in part by the National Institute of Health (NIH) Grants GM097010 and GM101026 to Haixin Sui.
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This study was supported in whole by the grants to Ying Lin from, the China National High Technology Research and Development Program (863-2012AA022205), High Technology Research and Development of Guangdong Province (2012A080800013), and The Recruitment Program of Leading Talents in Innovation and Entrepreneurship of Guangzhou (LCY201322), and in part by the National Institute of Health (NIH) Grants GM097010 and GM101026 to Haixin Sui.
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Wang, P., Zhang, L., Fisher, R. et al. Accurate analysis of fusion expression of Pichia pastoris glycosylphosphatidylinositol-modified cell wall proteins. J Ind Microbiol Biotechnol 44, 1355–1365 (2017). https://doi.org/10.1007/s10295-017-1962-8
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DOI: https://doi.org/10.1007/s10295-017-1962-8