優(yōu)良動物源抗汞益生乳酸菌的篩選及其抗性基因的克隆
[Abstract]:In order to isolate excellent probiotic lactic acid bacteria with mercury resistance of heavy metals and excavate genes resistant to mercury in bacteria, and to apply them to detoxification and treatment of heavy metal poisoning in animals, acid and pancreatic enzymes were screened out from the feces of healthy foxes and raccoon dogs. Lactic acid bacteria resistant to bile and bacteria with high mercury resistance were identified by 16s rRNA gene sequence analysis, and mer A gene was amplified by PCR. Acid resistance, pancreatic enzyme resistance and bile salt tolerance were screened out step by step from 72 strains of excellent probiotics. A strain of bacteria with good antibacterial performance and tolerance to 500 mg/L HgCl_2 of high concentration of heavy metal mercury was named CJT-KHg1, to determine its probiotics. The results showed that the strain was Lactococcus lactis after 16s rRNA sequence analysis, and the homology of mer A gene sequence with Klebsiella, Enterobacter cloacae and Shiva mer A gene sequence was 99%, which was proved to be Lactococcus lactococcus, and the homology of Lactic acid A gene sequence between the strain and Klebsiella, Enterobacter cloacae and Shiva was 99%. The mercury resistance gene cloned from the strain was due to the mercury reductase gene (Mercury reductase).
【作者單位】: 東北農(nóng)業(yè)大學動物醫(yī)學學院;
【基金】:黑龍江省大學生創(chuàng)新創(chuàng)業(yè)訓練計劃項目(201510224031)
【分類號】:Q93
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