Acta Veterinaria et Zootechnica Sinica ›› 2021, Vol. 52 ›› Issue (10): 2864-2873.doi: 10.11843/j.issn.0366-6964.2021.010.017

• PREVENTIVE VETERINARY MEDICIN • Previous Articles     Next Articles

Study on the GE296_RS01450 Gene-mediated Tolerance of Rimerella anatipestifer Strain RA-LZ01 to Heavy Metal Ions

QIN Mingxing1, GONG Xiaowei2, CHEN Qiwei2, WANG Yanping2, QUAN Heng1, ZHU Yujia1, ZHENG Fuying2*, LIN Guozhen1*   

  1. 1. College of Life Science and Engineering, Northwest Minzu University, Lanzhou 730030, China;
    2. State Key Laboratory of Veterinary Etiological Biology, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou 730046, China
  • Received:2021-01-22 Online:2021-10-23 Published:2021-10-27

Abstract: This study was conducted to clarify the role of GE296_RS01450 gene of Riemerella anatipestifer strain RA-LZ01 in mediating its tolerance to heavy metal ions. We constructed GE296_RS01450 gene deletion mutant Δ1450 and complemented strain cΔ1450. The growth curves of these strains, minimum inhibitory concentration (MIC) of antibiotics against them and their tolerance to heavy metal ions were determined, and the transcription levels of GE296_RS01450 gene of these strains treated with specific heavy metal ions were detected. The results showed that the growth ability of the deletion mutant and the MIC values of 11 classes of antibiotics to deletion mutant did not change significantly by comparison with the parent strain. By compared with parent strain and complemented strain, the sensitivity of deletion mutant to Ni, Mn and Co increased significantly. The transcription levels of GE296_RS01450 gene of parent strain treated with Ni and Mn were significantly up-regulated. The above results indicate that the GE296_RS01450 gene does not involve in the growth of the parent strain and the strain's resistance to antibiotics. However, the gene mediates the parent strain's tolerance to Ni, Mn and Co. GE296_RS01450 gene belongs to the GE296_RS01445-GE296_RS01450-GE296_RS01455 RND efflux pump and encodes the outer membrane protein. This protein is named RopM.

Key words: Riemerella anatipestifer, GE296_RS01450 gene, growth, antibiotics, heavy metal ions

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