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Translocation of the zinc-dependent metalloendopeptidase anthrax lethal factor (LF) from the endosome to the cytosol requires an acidic endosomal milieu. In the current study, we utilized immobilized (to prevent protein aggregation below pH 5.5) and native LF to assess the effect of pH on the function and metal content of LF. Our results reveal the diminution of LF's catalytic competence under moderately...