Journal of Microbiology and Biotechnology

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Attenuated Secretion of the Thermostable Xylanase xynB from Pichia pastoris Using Synthesized Sequences Optimized from the Preferred Codon Usage in Yeast

  • Huang, Yuankai (State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-Sen University) ;
  • Chen, Yaosheng (State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-Sen University) ;
  • Mo, Delin (State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-Sen University) ;
  • Cong, Peiqing (State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-Sen University) ;
  • He, Zuyong (State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-Sen University)
  • Received : 2011.09.16
  • Accepted : 2011.11.07
  • Published : 2012.03.28
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Abstract

Xylanase has been used extensively in the industrial and agricultural fields. However, the low-yield production of xylanase from native species cannot meet the increasing demand of the market. Therefore, improving the heterologous expression of xylanase through basic gene optimization may help to overcome the shortage. In this study, we synthesized a high-GC-content native sequence of the thermostable xylanase gene xynB from Streptomyces olivaceoviridis A1 and, also designed a slightly AT-biased sequence with codons completely optimized to be favorable to Pichia pastoris. The comparison of the sequences' expression efficiencies in P. pastoris X33 was determined through the detection of single-copy-number integrants, which were quantified using qPCR. Surprisingly, the high GC content did not appear to be detrimental to the heterologous expression of xynB in yeast, whereas the optimized sequence, with its extremely skewed codon usage, exhibited more abundant accumulation of synthesized recombinant proteins in the yeast cell, but an approximately 30% reduction of the secretion level, deduced from the enzymatic activity assay. In this study, we developed a more accurate method for comparing the expression levels of individual yeast transformants. Moreover, our results provide a practical example for further investigation of what constitutes a rational design strategy for a heterologously expressed and secreted protein.

Keywords

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