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You are here:Home » Antibodies » Antibodies-Infectious Disease Pseudomonas » Anti -Pseudomonas aeruginosa Exotoxin A

Anti -Pseudomonas aeruginosa Exotoxin A


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Clone Host Grade Applications
Polyclonal Goat Serum E B
Exotoxin A is one of the toxic proteins released by pathogenic strains of Pseudomonas aeruginosa. It is secreted as a proenzyme with a molecular weight of 66kD. Like diphtheria toxin, exotoxin A is translocated into susceptible mammalian cells. Covalent alteration of the molecule occurs, rendering it enzymatically active. The intact toxin can be activated 20- to 50-fold in vitro by treatment with urea and dithiothreitol. Exotoxin A catalyzes the transfer of the adenosine diphosphate ribose moiety of oxidized nicotinamide adenine dinucleotide onto elongation factor 2(3): NAD + EF-2 ® ADP-ribose-EF-2 + nicotinamide + H+. This ADP-ribosylation of EF-2 blocks polypeptide assembly on the surface of the ribosome. As a result, this molecule is cytopathic for a number of cultured cell lines and is toxic to animals. Although exotoxin A and diphtheria toxin have identical enzymatic activity, they exhibit distinct target cell specificities and are immunologically unrelated. In crude preparations or in purified material which has been stored, lower molecular weight peptides with ADP-ribosylating activity may be present. Similarly, after reduction and limited proteolytic cleavage with chymotrypsin, a 26,000D fragment that has enzymatic activity may be separated. This fragment alone is not toxic to intact cells.
Catalog #P9175-03
ApplicationsSuitable for use in ELISA and Western Blot. Other applications not tested.
Recommended DilutionsWestern Blot: 1:200,000
Optimal dilutions to be determined by the researcher.
TiterELISA: The titer measures at mid-point was 1:178,000 using 2ug coating of Endotoxin A.
Storage and StabilityLyophilized powder may be stored at -20°C. Stable for 12 months after receipt at -20°C. Reconstitute with sterile ddH2O. Aliquot to avoid repeated freezing and thawing. Store at -20°C. For maximum recovery of product, centrifuge the original vial after thawing and prior to removing the cap. Further dilutions can be made in assay buffer.
Clone TypePolyclonal
ConcentrationNot Determined
FormSupplied as a sterile-filtered lyophilized powder. Reconstitute with 500ul sterile ddH2O.
ImmunogenExotoxin A prepared from P. aeruginosa.
SpecificityRecognizes Pseudomonas aeruginosa Exotoxin A.
Important NoteThis product as supplied is intended for research use only, not for use in human, therapeutic or diagnostic applications without the expressed written authorization of United States Biological.

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