Video imaging analysis of the plasma membrane permeabilizing effects of Bacillus thuringiensis toxins in Sf9 cells

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DOIResolve DOI: http://doi.org/10.1016/S0005-2736(97)00184-3
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TypeArticle
Journal titleBiochimica et Biophysica Acta (BBA) - Biomembranes
Volume1368
Pages2734; # of pages: 8
SubjectBacillus thuringiensis; Insecticidal toxin; Sf9 cell; Membrane permeability; Cell volume; Video imaging technique
AbstractThe size and ionic selectivity of the pores formed by the insecticidal crystal protein Cry1C from Bacillus thuringiensis in the plasma membrane of Sf9 cells, an established cell line derived from the fall armyworm Spodoptera frugiperda, were analyzed with a video imaging technique. Changes in the permeability of the membrane were estimated from the rate of osmotic swelling of the cells. In the presence of Cry1C, which is toxic to Sf9 cells, the permeability of the cell membrane to KCl and glucose increased in a dose-dependent manner. In contrast, Cry1Aa, Cry1Ab and Cry1Ac, toxins to which Sf9 cells are not susceptible, had no detectable effect. Pores formed by Cry1C allowed the diffusion of sucrose, but were impermeable to the trisaccharide raffinose. On the basis of the hydrodynamic radii of these substances, the diameter of the pores was estimated to be 1.0–1.2 nm. In the presence of salts, the rate of swelling of cells exposed to Cry1C was about equally influenced by the size of the anion as by that of the cation, indicating that the ionic selectivity of the pores is low.
Publication date
LanguageEnglish
AffiliationNRC Biotechnology Research Institute; National Research Council Canada
Peer reviewedNo
NRC number40544
NPARC number3539949
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Record identifiere59d2a34-5636-4cb1-9153-693207b2def1
Record created2009-03-01
Record modified2016-05-09
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