Heterologous expression of glucose oxidase in the yeast Kluyveromyces marxianus

Microbial Cell Factories

Research

María I González-Siso¹  María E Cerdán¹  Andreas K Gombert²  Saul N Rocha²  José Abrahão-Neto³ 

[1] Departamento de Bioloxía Celular e Molecular, Facultade de Ciencias, Universidade da Coruña, Campus da Zapateira s/n, 15071-A, Coruña, Spain;Department of Chemical Engineering, Polytechnic School of Engineering, University of São Paulo, CP 61548, 05424-970, São Paulo, SP, Brazil;School of Pharmaceutical Sciences, University of São Paulo, Av Prof Lineu Prestes, 580-bloco 16, 05508-900, São Paulo, SP, Brazil;

关键词: Lactis;    Glucose Oxidase;    Heterologous Protein;    Periplasmic Space;    Glycosylation Pattern;   

DOI  :  10.1186/1475-2859-9-4

 received in 2009-08-03, accepted in 2010-01-21,  发布年份 2010

来源: Springer

【 摘 要 】

BackgroundIn spite of its advantageous physiological properties for bioprocess applications, the use of the yeast Kluyveromyces marxianus as a host for heterologous protein production has been very limited, in constrast to its close relative Kluyveromyceslactis. In the present work, the model protein glucose oxidase (GOX) from Aspergillus niger was cloned into K. marxianus CBS 6556 and into K. lactis CBS 2359 using three different expression systems. We aimed at verifying how each expression system would affect protein expression, secretion/localization, post-translational modification, and biochemical properties.ResultsThe highest GOX expression levels (1552 units of secreted protein per gram dry cell weight) were achieved using an episomal system, in which the INU1 promoter and terminator were used to drive heterologous gene expression, together with the INU1 prepro sequence, which was employed to drive secretion of the enzyme. In all cases, GOX was mainly secreted, remaining either in the periplasmic space or in the culture supernatant. Whereas the use of genetic elements from Saccharomyces cerevisiae to drive heterologous protein expression led to higher expression levels in K. lactis than in K. marxianus, the use of INU1 genetic elements clearly led to the opposite result. The biochemical characterization of GOX confirmed the correct expression of the protein and showed that K. marxianus has a tendency to hyperglycosylate the protein, in a similar way as already observed for other yeasts, although this tendency seems to be smaller than the one of e.g. K. lactis and S. cerevisiae. Hyperglycosylation of GOX does not seem to affect its affinity for the substrate, nor its activity.ConclusionsTaken together, our results indicate that K. marxianus is indeed a good host for the expression of heterologous proteins, not only for its physiological properties, but also because it correctly secretes and folds these proteins.

【 授权许可】

Unknown   
© Rocha et al; licensee BioMed Central Ltd. 2010. This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.