title: Location of receptor-binding region of protective antigen from Bacillus anthracis.
abstract: The pag gene, which codes for protective antigen (PA), a common component of the lethal and edema toxins of Bacillus anthracis, was cloned and expressed in Escherichia coli. Nested deletions of pag were generated into the C-terminus coding region. Recombinant proteins were analyzed by Western blot with either an anti-PA polyclonal antisera or two monoclonal antibodies that neutralized lethal toxin and edema toxin activities by inhibiting the binding of PA to cell receptors. Localization of the receptor binding domain within the C-terminal region of PA was suggested by the inability of the monoclonal antibodies 3B6 and 14B7 to recognize the recombinant proteins expressed by C-terminal deletions of the pag gene.
authors.affiliation: U.S. Army Medical Research Institute of Infectious Diseases Bacteriology Division, Fort Detrick, Frederick, Maryland 21702.
authors.forename: S F
authors.initials: SF
authors.lastname: Little
authors.forename: J R
authors.initials: JR
authors.lastname: Lowe
mesh_terms: D000942:Antigens, Bacterial; D001408:Bacillus anthracis / Q000235:genetics*; D001427:Bacterial Toxins / Q000235:genetics* / Q000302:isolation & purification; D015153:Blotting, Western; D002872:Chromosome Deletion; D003001:Cloning, Molecular; D004926:Escherichia coli / Q000235:genetics; D005798:Genes, Bacterial; D010957:Plasmids; D011994:Recombinant Proteins / Q000302:isolation & purification; D015183:Restriction Mapping
chemical_list: D000942:Antigens, Bacterial; D001427:Bacterial Toxins; D011994:Recombinant Proteins; C030325:anthrax toxin