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J. Biol. Chem., Vol. 266, Issue 23, 15493-15497, 08, 1991
Y Singh, KR Klimpel, CP Quinn, VK Chaudhary and SH Leppla
Anthrax toxin consists of three separate proteins produced by Bacillus
anthracis: protective antigen (PA), lethal factor (LF), and edema factor
(EF). Previous work showed that the process by which these proteins damage
eukaryotic cells begins with binding of PA (83 kDa) to cell surface
receptors. PA is then cleaved by a cell surface protease so as to expose a
high-affinity binding site for LF or EF on the COOH- terminal,
receptor-bound, 63-kilodalton fragment. In this report we more closely
define a region of PA involved in receptor binding. The gene encoding PA
was mutagenized so as to delete 3, 5, 7, 12, or 14 amino acids from the
carboxyl terminus of the protein, and the truncated PA variants were
purified from Bacillus subtilis or Escherichia coli. Deletion of 3, 5, or 7
amino acids reduced the binding of PA to cells and the subsequent toxicity
of the PA.LF complex to J774A.1 cells and also the ability to cause EF
binding to cells. Deletion of 12 or 14 amino acids completely eliminated
all these activities. These results show that the carboxy terminus
comprises or is part of the receptor-binding domain of PA.
The carboxyl-terminal end of protective antigen is required for receptor binding and anthrax toxin activity
Laboratory of Microbial Ecology, National Institute of Dental Research, Bethesda, Maryland 20892.
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