Increased Production of Recombinant O-Phospho-L-Serine Sulfhydrylase from the Hyperthermophilic Archaeon Aeropyrum pernix K1 Using Escherichia coli

Author(s): Takashi Nakamura*, Emi Takeda, Tomoko Kiryu, Kentaro Mori, Miyu Ohori, Eiki Kikugawa, Kazuhiko Ishikawa.

Journal Name: Current Biotechnology

Volume 8 , Issue 1 , 2019

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Background: O-phospho-L-serine sulfhydrylase from the hyperthermophilic archaeon Aeropyrum pernix K1 (ApOPSS) is thermostable and tolerant to organic solvents. It can produce non-natural amino acids in addition to L-cysteine.

Objective: We aimed to obtain higher amounts of ApOPSS compared to those reported with previous methods for convenience of research and for industrial production of L-cysteine and non-natural amino acids.

Method: We performed codon optimization of cysO that encodes ApOPSS, for optimal expression in Escherichia coli. We then examined combinations of conditions such as the host strain, plasmid, culture medium, and isopropyl β-D-1-thiogalactopyranoside (IPTG) concentration to improve ApOPSS yield.

Results and Discussion: E. coli strain Rosetta (DE3) harboring the expression plasmid pQE-80L with the codon-optimized cysO was cultured in Terrific broth with 0.01 mM IPTG at 37°C for 48 h to yield a 10-times higher amount of purified ApOPSS (650 mg·L-1) compared to that obtained by the conventional method (64 mg·L-1). We found that the optimal culture conditions along with codon optimization were essential for the increased ApOPSS production.The expressed ApOPSS had a 6-histidine tag at the N-terminal, which did not affect its activity. This method may facilitate the industrial production of cysteine and non-natural amino acids using ApOPSS.

Conclusion: We conclude that these results could be used in applied research on enzymatic production of L-cysteine in E. coli, large scale production of non-natural amino acids, enzymatic reaction in organic solvent, and environmental remediation by sulfur removal.

Keywords: Aeropyrum pernix K1, O-phospho-L-serine sulfhydrylase, cysteine synthesis, high expression level, codon optimization, terrific broth, low IPTG concentration.

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Article Details

Year: 2019
Page: [15 - 23]
Pages: 9
DOI: 10.2174/2211550108666190418125138

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