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Breeding and Physiological Characteristics of ε-Polylysine High-Producing Strain with Double Antibiotic Resistance |
Jun-jie ZHAO,Long ZHANG,Liang WANG,Xu-sheng CHEN,Zhong-gui MAO() |
Key Lab of Industrial Biotechnology of Education,School of Biotechnology,Jiangnan University,Wuxi 214122,China |
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Abstract Streptomyces albulus M-Z18 with 1.60g/L yield of ε-Poly-L-lysine was used as initial strain to screen high-yield mutant,and the physiological and biochemical properties of high-yield mutant were compared with M-Z18.The ribosomal engineering technology was used to breed the high-yield mutant with double antibiotic resistance. A genetically stable strain named S-7, was successfully screened by streptomycin mutagenesis. The ε-Poly-L-lysine yield of S-7 was 2.03g/L. S-7 was used as initial strain to screen mutant with paromomycin,and obtained SP-14, with 2.37g/L yield of ε-Poly-L-lysine. The use of streptomycin and paromomycin to breed high-yield mutant with high antibiotic resistance is an effective method.
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Received: 02 April 2018
Published: 11 September 2018
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Corresponding Authors:
Zhong-gui MAO
E-mail: maozg@jiangnan.edu.cn
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