Abstract
Oxidized polyvinyl alcohol (PVA) hydrolase (OPH) is a key enzyme in the degradation of PVA, suggesting that OPH has a great potential for application in textile desizing processes. In this study, the OPH gene from Sphingopyxis sp. 113P3 was modified, by artificial synthesis, for overexpression in Escherichia coli. The OPH gene, lacking the sequence encoding the original signal peptide, was inserted into pET-20b (+) expression vector, which was then used to transform E. coli BL21 (DE3). OPH expression was detected in culture medium in which the transformed E. coli BL21 (DE3) was grown. Nutritional and environmental conditions were investigated for improved production of OPH protein by the recombinant strain. The highest OPH activity measured was 47.54 U/mL and was reached after 84 h under optimal fermentation conditions; this level is 2.64-fold higher that obtained under sub-optimal conditions. The productivity of recombinant OPH reached 565.95 U/L/h. The effect of glycine on the secretion of recombinant OPH was examined by adding glycine to the culture medium to a final concentration of 200 mM. This concentration of glycine reduced the fermentation time by 24 h and increased the productivity of recombinant OPH to 733.17 U/L/h. Our results suggest that the recombinant strain reported here has great potential for use in industrial applications.
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Acknowledgments
This study was financially supported by the Program for New Century Excellent Talents in University (NCET-07-0378), the Key Program of National Natural Science Foundation of China (No. 20836003), the Major State Basic Research Development Program of China (973 Program, No. 2007CB714306) and the Priority Academic Program Development of Jiangsu Higher Education Institution.
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Yang, Y., Zhang, D., Liu, S. et al. Expression and fermentation optimization of oxidized polyvinyl alcohol hydrolase in E. coli . J Ind Microbiol Biotechnol 39, 99–104 (2012). https://doi.org/10.1007/s10295-011-1004-x
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DOI: https://doi.org/10.1007/s10295-011-1004-x