Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1986339 | International Journal of Biological Macromolecules | 2014 | 8 Pages |
Abstract
A novel atmospheric and room-temperature plasma (ARTP) method was used to breed high-yielding mutations of Arthrobacter KQ11. Mutagenesis produced two mutations, 4-1 and 4-13, which increased enzyme activity by 19 and 30%, respectively. Dents on the cell envelope were observed under scanning electron microscopy (SEM). The optimal temperature and pH of the wild strain were 45 °C and 5.5 and those of the mutant strains were 45 °C, pH 6.0 (4-1) and 50 °C, pH 6.0 (4-13). Under optimal enzyme production conditions of the wild and mutant strains, the dextranase activity of 4-13 was 50% higher than that of the wild strain. Through amino acid alignment, several nucleotides of the mutant strains were found to have changed. Experiments performed in vitro suggested that this endo-dextranase may inhibit biofilm formation by Streptococcus mutans.
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Authors
Xiaobei Wang, Mingsheng Lu, Shujun Wang, Yaowei Fang, Delong Wang, Wei Ren, Gengmao Zhao,