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• W2021007956 abstract "Protective antigen (PA) is the binding component of anthrax lethal toxin produced by Bacillus anthracis, and constitutes a major ingredient of the vaccine against anthrax. PA and lethal factor when added together are cytolytic to mouse macrophages and J774G8 macrophage cell line. This in vitro lethal toxicity assay is very useful in understanding the molecular mechanism of action of lethal toxin. Effective utilization of PA is, however, hampered due to its thermolability. On prolonged storage at 37 degrees C, PA was found to lose its activity almost completely. The effect of solvent additives like trehalose, sorbitol, xylitol, sodium citrate and magnesium sulphate on the thermal stabilization of PA was examined. The results indicated an increase in the stability of PA when the incubation at 37 degrees C was carried out in the presence of solvent additives used in the 1-3 M range. Magnesium sulphate helped retain the activity up to 82.7% against the control in which no additive was used, as judged by cytolytic assay using J774G8 macrophage cell line. Trehalose or sodium citrate also showed an appreciable protection of PA activity, while sorbitol or xylitol were not very effective. Competitive binding assay using radiolabeled PA showed that PA had lost capacity of binding to macrophage cells on prolonged incubation at 37 degrees C. Circular dichroism results at 4, 18, and 37 degrees C indicated an increase in secondary structure at 37 degrees C relative to that at 4 or 18 degrees C, supporting the activity data." @default.
• W2021007956 created "2016-06-24" @default.
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• W2021007956 date "1996-10-01" @default.
• W2021007956 modified "2023-09-25" @default.
• W2021007956 title "Thermostabilization of protective antigen—the binding component of anthrax lethal toxin" @default.
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• W2021007956 doi "https://doi.org/10.1016/0168-1656(96)01569-6" @default.
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