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. 1986 May;52(2):370–377. doi: 10.1128/iai.52.2.370-377.1986

Properties of dermonecrotic toxin prepared from sonic extracts Bordetella bronchiseptica.

K Kume, T Nakai, Y Samejima, C Sugimoto
PMCID: PMC261008  PMID: 3699886

Abstract

A toxin with dermonecrotic activity (DNT) was purified from sonic extracts of Bordetella bronchiseptica L3 of pig origin at phase I by chromatographic and electrophoretic methods. The purification procedure was one developed for obtaining the Pasteurella multocida DNT from sonic extracts with some modifications. Dermonecrotizing activity of B. bronchiseptica-purified DNT was increased by 600-fold compared with that of the crude extract, and the average yield was about 3%. The toxin was homogeneous, as determined by Ouchterlony double immunodiffusion, crossed immunoelectrophoresis, and disk isoelectric focusing in polyacrylamide gels. The toxin gave a single band on polyacrylamide disk gel electrophoresis (PAGE) and sodium dodecyl sulfate-SDS PAGE. The molecular weight of the toxin was ca. 190,000 +/- 5,000, as determined by SDS-PAGE. The isoelectric point of the toxin was ca. 6.5 to 6.6. The minimal necrotizing dose of the toxin for guinea pigs was about 2 ng of protein per 0.1 ml, the 50% lethal dose per mouse was about 0.3 micrograms, and the minimal cytotoxic dose for embryonic bovine lung cells was about 2 ng/ml. The toxin was heat labile and sensitive to inactivation by trypsin, Formalin, and glutaraldehyde. The mildly trypsinized B. bronchiseptica DNT preparation dissociated into two polypeptide chains, with molecular weights of ca. 75,000 +/- 4,000 (fragment 1) and ca. 118,000 +/- 5,000 (fragment 2), after treatment with dithiothreitol-SDS or urea. Upon removal of dithiothreitol and urea from the dissociated DNT preparation, the fragments reassociated, and the DNT that was formed was indistinguishable from the native toxin.

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Selected References

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