Two- Dimensional Electrophoresis Analysis of Proteins; Bacillus subtilis LTD and Its Antifungal Activity Deficient Mutant

  • Lee, Young-Keun (Radiation Application Research Division, Korea Atomic Energy Research Institute) ;
  • Dinh, Le Thi (Institute for Nuclear Science and Techniques) ;
  • Jang, Yu-Sin (Radiation Application Research Division, Korea Atomic Energy Research Institute) ;
  • Chung, Hye-Young (Radiation Application Research Division, Korea Atomic Energy Research Institute) ;
  • Chang, Hwa-Hyoung (Radiation Application Research Division, Korea Atomic Energy Research Institute)
  • Published : 2004.12.01

Abstract

To investigate the antifungal activity related protein in pesticidal bacteria, a bacterial strain LTD was isolated from soil collected at Gimje in Jeonbuk province, Korea, and identified as Bacillus subtilis LTD based on a API50 CHB kit and 168 rDNA sequencing. It has an antifungal activity against 9 plant pathogenic fungi in a paper disc assay. The antifungal activity- deficient mutant, B. subtilis mLTD was induced at a 5 kGy dose of $^{60}Co$ gamma radiation. Using the two-dimensional electrophoresis and the matrix assisted laser desorption ionization time-of-flight mass spectrometry, the comparison analysis of proteins between the wild and mutant were performed. A major intracellular serine proteinase IspA (MW: 32.5 kDa), a NAD (P) H dehydrogenase (MW: 20.0 kDa), and a stage II sporulation protein AA, SpoIIAA (MW: 14.3kDa) were detected only in the B. subtilis LTD. These results suggested that the functions of these proteins found only in the B. subtilis LTD could. be closely related to the antifungal activity against plant pathogenic fungi.

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