整合生物学期刊网

应用天然产物 ›› 2012, Vol. 2 ›› Issue (3): 104-110.DOI: 10.1007/s13659-012-0021-4

• Regular Article • 上一篇    下一篇

Antimicrobial activity of PVP from an Antarctic bacterium, Janthinobacterium sp. Ant5-2, on multi-drug and methicillin resistant Staphylococcus aureus

Jonathan P. HUANGa, Nazia MOJIBa,e, Rakesh R. GOLIa, Samantha WATKINSa, Ken B. WAITESb, Rasik RAVINDRAc, Dale T. ANDERSENd, Asim K. BEJa   

  1. a Department of Biology, University of Alabama at Birmingham, Birmingham, AL 35294-1170, USA;
    b Department of Pathology, University of Alabama at Birmingham, Birmingham, AL 35294-1170, USA;
    c National Centre for Antarctic & Ocean Research, Head Land Sada, Vasco-da-Gama Goa 403804, India;
    d Carl Sagan Center for the Study of Life in the Universe, SETI Institute, Mountain View, CA 94043, USA;
    e Red Sea Research Center, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
  • 收稿日期:2012-03-11 修回日期:2012-03-21 出版日期:2012-06-24 发布日期:2018-02-11
  • 通讯作者: Asim K.BEJ,E-mail:abej@uab.edu
  • 基金资助:
    We thank Col.(IL) J. N. Pritzker ARNG(Retired), Tawani Foundation(Chicago) for supporting the Tawani 2008 International Antarctic Scientific Expedition;Marty Kress, VCSI, Inc. /NASA;Richard Hoover, NASA;and 2008-2009 Antarctic Maitri(India) and Novolazarevskaya(Russia) Station staffs.

Antimicrobial activity of PVP from an Antarctic bacterium, Janthinobacterium sp. Ant5-2, on multi-drug and methicillin resistant Staphylococcus aureus

Jonathan P. HUANGa, Nazia MOJIBa,e, Rakesh R. GOLIa, Samantha WATKINSa, Ken B. WAITESb, Rasik RAVINDRAc, Dale T. ANDERSENd, Asim K. BEJa   

  1. a Department of Biology, University of Alabama at Birmingham, Birmingham, AL 35294-1170, USA;
    b Department of Pathology, University of Alabama at Birmingham, Birmingham, AL 35294-1170, USA;
    c National Centre for Antarctic & Ocean Research, Head Land Sada, Vasco-da-Gama Goa 403804, India;
    d Carl Sagan Center for the Study of Life in the Universe, SETI Institute, Mountain View, CA 94043, USA;
    e Red Sea Research Center, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
  • Received:2012-03-11 Revised:2012-03-21 Online:2012-06-24 Published:2018-02-11
  • Supported by:
    We thank Col.(IL) J. N. Pritzker ARNG(Retired), Tawani Foundation(Chicago) for supporting the Tawani 2008 International Antarctic Scientific Expedition;Marty Kress, VCSI, Inc. /NASA;Richard Hoover, NASA;and 2008-2009 Antarctic Maitri(India) and Novolazarevskaya(Russia) Station staffs.

摘要: Multiple drug resistant(MDR) and methicillin-resistant Staphylococcus aureus(MRSA) have become increasingly prevalent as a community acquired infection. As a result limited treatment options are available with conventional synthetic antibiotics. Bioprospecting natural products with potent antimicrobial activity show promise for developing new drugs against this pathogen. In this study, we have investigated the antimicrobial activity of a purple violet pigment(PVP) from an Antarctic bacterium, Janthinobacterium sp. Ant5-2 on 15 clinical MDR and MRSA strains. The colorimetric resazurin assay was employed to determine the minimum inhibitory concentration(MIC90) of PVP against MDR and MRSA. The MIC90 ranged between 1.57 μg/mL and 3.13 μg/mL, which are significantly lower than many antimicrobials tested from natural sources against this pathogen. The spectrophotometrically determined growth analysis and total microscopic counts using Live/dead® BacLightTM fluorescent stain exhibited a steady decrease in viability of both MDR and MRSA cultures following treatment with PVP at the MIC levels. In silico predictive molecular docking study revealed that PVP could be a DNA-targeting minor groove binding antimicrobial compound. The continued development of novel antimicrobials derived from natural sources with the combination of a suite of conventional antibiotics could stem the rising pandemic of MDR and MRSA along with other deadly microbial pathogens.

关键词: natural product, bacterial pigment, resazurin assay, minimum inhibitory concentration(MIC)

Abstract: Multiple drug resistant(MDR) and methicillin-resistant Staphylococcus aureus(MRSA) have become increasingly prevalent as a community acquired infection. As a result limited treatment options are available with conventional synthetic antibiotics. Bioprospecting natural products with potent antimicrobial activity show promise for developing new drugs against this pathogen. In this study, we have investigated the antimicrobial activity of a purple violet pigment(PVP) from an Antarctic bacterium, Janthinobacterium sp. Ant5-2 on 15 clinical MDR and MRSA strains. The colorimetric resazurin assay was employed to determine the minimum inhibitory concentration(MIC90) of PVP against MDR and MRSA. The MIC90 ranged between 1.57 μg/mL and 3.13 μg/mL, which are significantly lower than many antimicrobials tested from natural sources against this pathogen. The spectrophotometrically determined growth analysis and total microscopic counts using Live/dead® BacLightTM fluorescent stain exhibited a steady decrease in viability of both MDR and MRSA cultures following treatment with PVP at the MIC levels. In silico predictive molecular docking study revealed that PVP could be a DNA-targeting minor groove binding antimicrobial compound. The continued development of novel antimicrobials derived from natural sources with the combination of a suite of conventional antibiotics could stem the rising pandemic of MDR and MRSA along with other deadly microbial pathogens.

Key words: natural product, bacterial pigment, resazurin assay, minimum inhibitory concentration(MIC)