Serum protease cleavage of Bacillus anthracis protective antigen.


The protective antigen component of anthrax lethal toxin, produced in vitro, has a molecular mass of 83 kDa. Cell-culture studies by others have demonstrated that upon binding of the 83 kDa protective antigen to cell-surface receptors, the protein is cleaved by an unidentified cell-associated protease activity. The resultant 63 kDa protein then binds lethal… (More)


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