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Modification of three or four of the five histidine residues in the toxic shock syndrome toxin 1 (TSST-1) with diethylpyrocarbonate did not inhibit the precipitin reaction of the modified TSST-1 with polyvalent antisera to the toxin. Monoclonal antibody 7T did not react with the modified TSST-1, but monoclonal antibody 8T did react with the toxin. Up to 50% of the mitogenic reaction of TSST-1 was inhibited by the histidine modification. Modification of one or two of the nine tyrosine residues in TSST-1 did not inhibit the precipitin reaction with polyclonal antisera to the toxin but did inhibit 85% of the mitogenic reaction.

infection and immunity

Effect of chemical modification of histidine and tyrosine residues in toxic shock syndrome toxin 1 on the serologic and mitogenic activities of the toxin