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한국미생물·생명공학회지 = Korean journal of microbiology and biotechnology v.38 no.2, 2010년, pp.117 - 123  
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곤충살충성 세균 Photorhabdus의 Insecticidal Toxin과 연구동향
Insecticidal Toxin and Research Trends of Photorhabdus, Entomopathogenic Bacteria

장은경    (경북대학교 응용생명과학부   ); 신재호    (경북대학교 응용생명과학부  );
  • 초록

    BT toxin is produced by a soil bacterium Bacillus thuringiensis and has long been used as a biological insecticide without any competition. Recently, Photorhabdus, a symbiotic bacterium from entomopathogenic nematodes, family Heterorhabditae, has been researched and discussed as alternatives to B. thuringiensis. Photorhabdus, which lives in the gut of entomopathogenic nematodes, is a highly virulent pathogen of a wide range of insect larvae. When an insect is infected by the nematodes, the bacteria are released into the cadaver, and produce a number of insecticidal toxins. The biological role of the different Photorhabdus toxins in the infection process is still unclear. Photorhabdus toxin complex (Tc) is highly secreted gut-active toxin and has been characterized as a potent three-component (A, B and C) insecticidal protein complex. These components are necessary for full oral activity against insect larvae. The Photorhabdus PirAB binary toxins exhibit a potent injectable activity for Galleria mellonella larvae, and have oral toxicity against mosquitoes and caterpillar pest Plutella xylostella. Other toxin, 'makes caterpillars floppy' (Mcf) showed injectable activity on caterpillars. Recombinant Mcf triggers apoptosis in both insect hemocytes and the midgut epithelium and carries a BH3 domain. In this review, the relationship between the Photorhabdus and the nematode is discussed and recent important insecticidal toxins from Photorhabdus are described.


  • 주제어

    Entomopathogenic bacteria .   Symbiosis .   Photorhabdus .   Insecticidal toxin.  

  • 참고문헌 (30)

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