ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2013, Vol. 44 ›› Issue (12): 2000-2006.doi: 10.11843/j.issn.0366-6964.2013.12.021

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Antibacterial Mechanism of Baicalein on Methicillin-resistant Staphyloccocus aureus

CHEN Yu-xian1,ZHOU Tong2,XIE Kun-peng1,YUN Bao-yi1,XIE Ming-jie1*   

  1. (1.Liaoning Provincial Key Laboratory of Biotechnology and Drug Discovery, College of Life Science, Liaoning Normal University, Dalian 116081, China; 2.Fuxin College, Fuxin 123000, China)
  • Received:2013-07-08 Online:2013-12-23 Published:2013-12-23

Abstract:

The study objective was to investigate the antibacterial activity and antibacterial mechanism of baicalein on Methicillin-resistant  Staphylococcus aureus (MRSA). The experiments were carried out by studying baicalein inhibition against MRSA, determining the changes of membrane penetrability, protein synthesis, DNA topoisomerase activities and restriction map. Baicalein has a strong impact on MRSA, and the minimum inhibitory concentration reached 0.04 mg·mL-1. After treated with Baicalein for 16 h, the total soluble content of proteins was decreased by 44.62%. Moreover, the activities of DNA topoisomerase and were inhibited by 0.025 mg·mL-1 Baicalein. Taq restriction enzyme electropherogram appeared to be an obvious change when baicalein was added with DNA after a certain time. We initially speculated Baicalein with DNA binding sites may be between the bases T and CGA or be the T/CGA similar nucleotide positions. The results suggest that Baicalein may be embedded in bacterial DNA molecules, inhibits the activity of DNA topoisomerase and influences the normal DNA replication and transcription, thereby inhibiting protein translation in the downstream process, causing the loss of the bacteria biological function and inhibiting cell growth and reproduction.

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