Identification of functional epitopes of Pseudomonas aeruginosa exotoxin A using synthetic peptides and subclone products.
The structure-function relationship of P. aeruginosa exotoxin A (ETA) was examined using synthetic peptides and genetically engineered ETA deletion mutants. Antibodies directed against synthetic peptides have allowed the identification of three ETA epitopes, two within domain I and one within the last 33 amino acids of domain III. In addition two distinct neutralizing determinants have been identified by antibodies directed against subclone products. One was associated with the amino-terminal half of ETA, the proposed receptor binding region. The second was associated with the carboxy-terminal half of ETA, a region previously not associated with receptor-binding. The amino-terminal subclone also offers potential as an ETA vaccine, since it produces a stable, non-enzymatically active product, effective in inducing ETA neutralizing antibodies. Data derived from these studies were used in a re-evaluation of structure-function relationships between ETA and diphtheria toxin.
Department of Pathology, Medical University of South Carolina, Charleston 29425.
J C
JC
Olson
A N
AN
Hamood
T S
TS
Vincent
E H
EH
Beachey
B H
BH
Iglewski
D036002:ADP Ribose Transferases; D000595:Amino Acid Sequence; D000818:Animals; D000907:Antibodies, Bacterial / Q000096:biosynthesis; D001427:Bacterial Toxins / Q000737:chemistry / Q000276:immunology*; D001667:Binding, Competitive; D002872:Chromosome Deletion; D004252:DNA Mutational Analysis; D004167:Diphtheria Toxin / Q000737:chemistry / Q000276:immunology; D004591:Electrophoresis, Polyacrylamide Gel; D004797:Enzyme-Linked Immunosorbent Assay; D000939:Epitopes / Q000737:chemistry / Q000276:immunology; D005098:Exotoxins / Q000737:chemistry / Q000276:immunology*; D005260:Female; D007114:Immunization; D008958:Models, Molecular; D008969:Molecular Sequence Data; D009500:Neutralization Tests; D010446:Peptide Fragments / Q000138:chemical synthesis / Q000737:chemistry / Q000276:immunology; D011550:Pseudomonas aeruginosa / Q000276:immunology*; D051381:Rats; D011919:Rats, Inbred Strains; D011994:Recombinant Proteins / Q000737:chemistry / Q000276:immunology; D013329:Structure-Activity Relationship; D037521:Virulence Factors; D000097668:Pseudomonas aeruginosa Exotoxin A
D036002:ADP Ribose Transferases; D000907:Antibodies, Bacterial; D001427:Bacterial Toxins; D004167:Diphtheria Toxin; D000939:Epitopes; D005098:Exotoxins; D010446:Peptide Fragments; D011994:Recombinant Proteins; D037521:Virulence Factors; D000097668:Pseudomonas aeruginosa Exotoxin A