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. 1989 Aug;57(8):2462–2469. doi: 10.1128/iai.57.8.2462-2469.1989

Purification of the Clostridium spiroforme binary toxin and activity of the toxin on HEp-2 cells.

M R Popoff 1, F W Milward 1, B Bancillon 1, P Boquet 1
PMCID: PMC313471  PMID: 2545625

Abstract

The two components Sa (Mr, 44,000) and Sb (Mr, 92,000) of Clostridium spiroforme toxin were identified and characterized. Serological data permitted the identification of two groups of actin ADP-ribosylating clostridial toxins. The first consists of only C. botulinum C2. The second group includes spiroforme toxin, iota toxin of C. perfringens E, and an enzyme called CDT found in one strain of C. difficile, antibodies against which cross-react with all of the members of both groups. C. spiroforme toxin acted on cells by disrupting microfilaments by ADP-ribosylation of G actin. Toxicity was not blocked by 10 or 20 mM ammonium chloride and was only moderately inhibited by 30 mM NH4Cl. Inhibition of coated-pit formation in HEp-2 cells by potassium depletion strongly protected against the effect of C. spiroforme toxin. Toxicity was not blocked by incubation of HEp-2 cells and spiroforme toxin at 15 degrees C. These results suggest that this new binary toxin enters cells via the coated-pit-coated-vesicle pathway and might reach the cytoplasm at the same time as or before transfer to early endosomes.

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Selected References

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