4.6 Article

Susceptibility of Opportunistic Burkholderia glumae to Copper Surfaces Following Wet or Dry Surface Contact

Journal

MOLECULES
Volume 19, Issue 7, Pages 9975-9985

Publisher

MDPI
DOI: 10.3390/molecules19079975

Keywords

B. glumae; copper; antibacterial activity; membrane damage

Funding

  1. Zhejiang Provincial Natural Science Foundation of China [R13C140001, LY12C14007, LQ13C140001]
  2. Zhejiang Provincial Project [2014C32010]
  3. National Natural Science Foundation of China [31371904]
  4. Fundamental Research Funds for the Central Universities
  5. Agricultural Ministry of China [nyhyzx 201303015, 201003015, 201003066]
  6. Jinhua Science and Technology Research Projects [2013-2-029]
  7. Key Subject Construction Program of Zhejiang for Modern Agricultural Biotechnology and Crop Disease Control [2010DS700124-KF1101, 2010DS700124-KF1203, 2010DS700124-KF1309, 2010DS700124-KF1410]

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Burkholderia glumae has been proposed to have a potential risk to vulnerable communities. In this work, we investigated the antibacterial activity and mechanism of copper surfaces against multi-drug resistant B. glumae from both patients and rice plants. The susceptibility of B. glumae to copper surfaces was noted by a significant decline in viable bacterial counts, relative to the slight reduction of stainless steel and polyvinylchloride, both of which were used as control surfaces. The mode of action of bacterial killing was determined by examing the mutagenicity, DNA damage, copper ions accumulation, and membrane damage in bacterial cells. The results indicated that the cells exposed to copper surfaces did not cause severe DNA lesions or increase the mutation frequencies, but resulted in a loss of cell membrane integrity within minutes. Furthermore, bacterial cells exposed to copper surfaces accumulated significantly higher amounts of copper compared to control surfaces. Overall, this study showed that metallic copper had strong antibacterial effect against B. glumae by causing DNA and membrane damage, cellular accumulation of copper, and cell death following DNA degradation, which could be utilized to reduce the risk of bacterial contamination and infection.

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