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Simultaneous cell disruption and semi-quantitative activity assays for high-throughput screening of thermostable L-asparaginases.


ABSTRACT: L-asparaginase, which catalyses the hydrolysis of L-asparagine to L-aspartate, has attracted the attention of researchers due to its expanded applications in medicine and the food industry. In this study, a novel thermostable L-asparaginase from Pyrococcus yayanosii CH1 was cloned and over-expressed in Bacillus subtilis 168. To obtain thermostable L-asparaginase mutants with higher activity, a robust high-throughput screening process was developed specifically for thermophilic enzymes. In this process, cell disruption and enzyme activity assays are simultaneously performed in 96-deep well plates. By combining error-prone PCR and screening, six brilliant positive variants and four key amino acid residue mutations were identified. Combined mutation of the four residues showed relatively high specific activity (3108 U/mg) that was 2.1 times greater than that of the wild-type enzyme. Fermentation with the mutant strain in a 5-L fermenter yielded L-asparaginase activity of 2168?U/mL.

SUBMITTER: Li X 

PROVIDER: S-EPMC5962637 | biostudies-literature | 2018 May

REPOSITORIES: biostudies-literature

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Simultaneous cell disruption and semi-quantitative activity assays for high-throughput screening of thermostable L-asparaginases.

Li Xu X   Zhang Xian X   Xu Shuqin S   Zhang Hengwei H   Xu Meijuan M   Yang Taowei T   Wang Li L   Qian Haifeng H   Zhang Huiling H   Fang Haitian H   Osire Tolbert T   Rao Zhiming Z   Yang Shangtian S  

Scientific reports 20180521 1


L-asparaginase, which catalyses the hydrolysis of L-asparagine to L-aspartate, has attracted the attention of researchers due to its expanded applications in medicine and the food industry. In this study, a novel thermostable L-asparaginase from Pyrococcus yayanosii CH1 was cloned and over-expressed in Bacillus subtilis 168. To obtain thermostable L-asparaginase mutants with higher activity, a robust high-throughput screening process was developed specifically for thermophilic enzymes. In this p  ...[more]

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