Extraordinary polymerization of salmonella flagellin in vitro

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Abstract 1. 1. A cellular component which promotes polymerization of Salmonella flagellin under physiological environmental conditions was fractionated from an autolysate of the deflagellated bacterial cells by differential centrifugation. 2. 2. This component is membranous in nature and probably originating from the cell wall and/or cytoplasmic membrane. 3. 3. Filaments produced in this polymerization are straight and are thinner than flagella. They are highly stable against heat (boiling for 5 min), acid (0.1 M HCl) and alkali (0.1 M NaOH) and never depolymerize under the environmental conditions where flagella completely depolymerize. These filaments are named P-filaments. 4. 4. Environmental conditions required for the polymerization of flagellin into P-filaments were examined. 5. 5. Serological comparisons between P-filaments and flagella showed that the two types of filaments have common specific antigenecities.

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