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. 1987 May;55(5):1309–1313. doi: 10.1128/iai.55.5.1309-1313.1987

Detection of subunits of pertussis toxin in Tn5-induced Bordetella mutants deficient in toxin biological activity.

K S Marchitto, J J Munoz, J M Keith
PMCID: PMC260506  PMID: 2883124

Abstract

Monoclonal antibodies with specificity for pertussis toxin subunits S1, S2, and S4 were used in Western blots to show that the subunits were not secreted into culture medium from Tn5 insertion mutants. The mutants are deficient in toxin biological activities due to an insertion in the S3 subunit structural gene. The Western blots demonstrated that each of the respective subunits was exported in a wild-type strain. Anti-S1 and anti-S2 monoclonal antibodies were capable of detecting subunits in solubilized whole-cell material from a wild-type strain and from the Tn5 mutants lacking only in biologically active toxin (Tox-). Another Tn5 insertion mutant, lacking all known B. pertussis virulence factors (Vir-), did not produce any of the subunits either in whole cellular extracts or in culture supernatants. The data demonstrate that Tn5 Tox- insertion mutants, though defective in toxin activity, synthesize some toxin subunits. The presence of the S3 subunit is most likely a necessity for transport of the toxin from cells. Alternatively, a nonstructural gene coding for a protein involved in transport of the toxin across the membrane may be affected by the Tn5 mutation.

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Selected References

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