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Specifications

Clone Host Grade Applications Polyclonal Goat Serum E

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 26,000 dalton fragment that has enzymatic activity may be separated. This fragment alone is not toxic to intact cells.
Catalog #	P9175-03
Applications	Suitable for use in ELISA and Double Immunodiffusion assay. Other applications not tested.
Recommended Dilutions	Optimal dilutions to be determined by the researcher.
Storage and Stability	Lyophilized powder may be stored at -20°C. Stable for 12 months at -20°C. Reconstitute with sterile ddH2O. Aliquot to avoid repeated freezing and thawing. Store at -20°C. Reconstituted product is stable for 12 months 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.
CAS Number	n/a
Clone Type	Polyclonal
Isotype	IgG
Host	Goat
Concentration	Not Determined
Form	Supplied as a sterile-filtered lyophilized powder. Reconstitute with 1ml sterile ddH2O.
Purity	Serum
Immunogen	Exotoxin A prepared from P. aeruginosa.
Specificity	Recognizes Pseudomonas aeruginosa Exotoxin A.
Important Note	This 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.