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Cloning and coexpression of recombinant N-demethylase B and Glycolate oxidase genes in Escherichia coli

  • Dengchao Li
  • Qiumin Han
  • Tong Zhang
Original Article

Abstract

NdmB genes from Pseudomonas putida CBB5 and GO genes from spinach, which encode N-demethylase B (NdmB) and Glycolate oxidase (GO) respectively, were separately ligated into expression vectors of pACYCDuet-1 and pET32a to construct recombinant plasmids of pACYCDuet-1-ndmBHis (pBH) and pET32a-GOHis (pGOH). Then the two plasmids were both transformed in Escherichia coli (E. coli) strain BL21 (DE3) and screening the recombinants (pBHGOH) using ampicillin and chloramphonicol as two antibiotics in Luria–Bertani medium. After induction with IPTG, both recombinant ndmB and GO genes were coexpressed in E. coli. Sodium dodecyl sulphate polyacrylamide gel electrophoresis (SDS–PAGE) showed that the estimated molecular weight of NdmB and GO was 35 kDa and 40 kDa, respectively. By two-step purification of Ni affinity chromatography and Q-Sepharose chromatography, the coexpressed NdmB and GO were separated and resulted in a 15.8-fold purification with 8.7% yield and 12.8-fold purification with 7.2% yield, respectively.

Keywords

N-Demethylase B Glycolate oxidase Pseudomonas putida CBB5 Spinach Cloning Coexpression 

Notes

Acknowledgements

This research was supported by Top-notch Academic Programs Project of Jiangsu Higher Education Institutions under Grant Number PPZY2015A018.

Compliance with ethical standards

Conflict of interest

The author declares that they have no conflict of interests.

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Copyright information

© Springer Nature B.V. 2018

Authors and Affiliations

  1. 1.Department of Bioengineering, School of Life Science, Jiangsu Collaborative Innovation Center of Regional Modern Agriculture and Environmental ProtectionHuaiyin Normal UniversityHuai’anChina
  2. 2.School of HealthJiangsu Food and Pharmaceutical Science CollegeHuai’anChina

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