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Appl Environ Microbiol. 1972 July; 24(1): 108-113
Copyright © 1972 American Society for Microbiology. All Rights Reserved.

Activation of a Toxic Component of Clostridium botulinum Types C and D by Trypsin

M. W. Eklund and F. T. Poysky

1 Pacific Fishery Products Technology Center, National Marine Fisheries Service, National Oceanic and Atmospheric Administration, Seattle, Washington 98102

ABSTRACT

When the Stockholm and 468C strains of type C and the 1873 strain of type D Clostridium botulinum are "cured" of their prophages, they simultaneously discontinue the production of their dominant toxins (C1 and D), but they continue to produce a second antigenically monospecific toxin (C2). These "cured" strains of types C and D therefore become indistinguishable with respect to the toxin produced. Fifteen type C cultures received from other laboratories discontinued to produce the dominant toxin when subcultured in broth. The C2 toxin, however, was produced by eight of these cultures. The C2 toxin is produced by these cultures as a protoxin that requires treatment with trypsin before its toxicity can be demonstrated. Of the 21 type C cultures that produce the C1 toxin, 20 were shown to produce the C2 toxin. The filtrates of 14 of these cultures required trypsin treatment before the C2 toxicity could be demonstrated. Low levels of toxicity could be demonstrated in the six remaining culture fluids without trypsin; toxicity, however, was increased with trypsin.

Appl Environ Microbiol. 1972 July; 24(1): 108-113
Copyright © 1972 American Society for Microbiology. All Rights Reserved.





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Copyright © 1972 by the American Society for Microbiology. All rights reserved.