Enhanced cyanophycin production by Escherichia coli overexpressing the heterologous cphA gene from a deep sea metagenomic library

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Cyanophycin is a non-ribosomally synthesized polymer and its microbial production has attracted increased attention due to its pharmaceutical and chemical values. For the characterization and production of cyanophycin, the cphA(49) gene was cloned and expressed in Escherichia coli. Soluble cyanophycin was isolated from the cultures and characterized. The results showed that it was composed of 50% of aspartic acid, 45% of arginine, and 3.5% of lysine, and exhibited a homogenous molecular mass of 35 kDa. To improve soluble cyanophycin production, the induction conditions for cphA(49) gene expression were optimized. Meanwhile, the effects of medium content and induction duration on soluble cyanophycin production were also investigated, and the soluble cyanophycin yield reached a maximum at 72 h. Finally, to further increase the soluble cyanophycin production, the cultivation was carried out by supplement of arginine, aspartic acid, lysine and glucose into the minimal resource medium after cphA(49) gene expression level was improved under optimized conditions, and the maximum concentration of soluble cyanophycin reached 1.72 g/L. (C) 2016, The Society for Biotechnology, Japan. All rights reserved.
Publisher
SOC BIOSCIENCE BIOENGINEERING JAPAN
Issue Date
2017-02
Language
English
Article Type
Article
Keywords

MOLECULAR CHARACTERIZATION; SACCHAROMYCES-CEREVISIAE; SOLUBILITY BEHAVIOR; PSEUDOMONAS-PUTIDA; TECHNICAL-SCALE; LYSINE CONTENT; SYNTHETASE; STRAINS; BIOSYNTHESIS; OPTIMIZATION

Citation

JOURNAL OF BIOSCIENCE AND BIOENGINEERING, v.123, no.2, pp.239 - 244

ISSN
1389-1723
DOI
10.1016/j.jbiosc.2016.08.008
URI
http://hdl.handle.net/10203/223292
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