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Antibacterial activity of Cry- and Cyt-proteins from Bacillus thuringiensis ssp. israelensis

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Mosquitocidal endotoxins Cry4B, Cry11A, and CytA from Bacillus thuringiensis ssp.israelensis as well as the products of their limited proteolysis display antibacterial activity relative to Micrococcus luteus. The endotoxin Cry11A also induces the lysis of the micrococcus protoplasts. Potassium and sodium ions and N-acetylgalactosamine increased the antibacterial effect of Cry11A, whereas glucose and N-acetylglucosamine inhibited it. The endotoxin Cry11A displays the antibacterial effect on some other microorganisms.Key words: Bacillus thuringiensis, Micrococcus luteus, d-endotoxins, antibacterial activity.

Les endotoxines Cry4B, Cry11 Aet CytA de Bacillus thurigiensis ssp. israelensis et les produits de leur protéolyse partielle sont toxiques pour les moustiques et possèdent aussi une activité bactéricide envers Micrococcus luteus. L'endotoxine Cry11 Acause aussi la lyse des protoplastes de microcoques. Les ions sodium et potassium et la N-acétylgalactosamine augmentent l'effet antibactérien de Cry11 Aalors que le glucose et la N-acétylglucosamine agissent comme inhibiteurs. L'effet antibactérien de l'endotoxine Cry11A s'exprime aussi envers d'autres microorganismes.Mots clés : Bacillus thuringiensis, Micrococcus luteus, endotoxines d, activité antibactérienne.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: January 1, 2003

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  • Published since 1954, this monthly journal contains new research in the field of microbiology including applied microbiology and biotechnology; microbial structure and function; fungi and other eucaryotic protists; infection and immunity; microbial ecology; physiology, metabolism and enzymology; and virology, genetics, and molecular biology. It also publishes review articles and notes on an occasional basis, contributed by recognized scientists worldwide.
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