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D0564 Sigma

Diphtheria Toxin from Corynebacterium diphtheriae

lyophilized powder



Frequently Asked Questions

Frequently Asked Questions are available for this Product.

Biochem/physiol Actions

Inhibits protein synthesis by catalyzing ADP-ribosylation of eukaryotic aminoacyltransferase II.


Each vial, when reconstituted to 0.5 mL with sterile distilled water, contains ~1 mg of diphtheria toxin in 0.01 M Tris and 0.001 M Na2EDTA, pH 7.5.

Physical form

Lyophilized powder containing Tris and EDTA.


Diphtheria toxin may be used as a toxin element in the construction of immunotoxin for cell specific cytotoxicity. The translocation domain of bacterial toxins with natural endosome escape mechanism has been used in the development of efficient nonviral vectors for applications in gene therapy.

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Safety & Documentation

Safety Information

GHS06  GHS06
Signal word 
Hazard statements 
Precautionary statements 
UN 3462 6.1 / PGI
WGK Germany 


Certificate of Analysis

Certificate of Origin

Frequently Asked Questions

Which document(s) contains shelf-life or expiration date information for a given product?
If available for a given product, the recommended re-test date or the expiration date can be found on the Certificate of Analysis. These documents are located on the product detail page under Useful Links & Tools. Click on the following link to search for a Certificate of Analysis. Please click the following link to see the details on our Product Dating Information.
How do I get lot-specific information or a Certificate of Analysis?
A Certificate of Analysis is available by lot number and can be obtained through our Advanced Search Option: http://www.sigmaaldrich.com/catalog/AdvancedSearchPage.do
What is the solubility of Product D0564, Diphtheria Toxin from Corynebacterium diphtheriae?
This product is soluble in water.  Reconstitute with the volume of water described under Description on our website page for D0564.  
What is the solution stability of Product D0564, Diphtheria Toxin from Corynebacterium diphtheriae?
Once the product is reconstituted in water, the solution may be stored in aliquots at -20°C. Avoid freeze-thawing. Long-term storage in the refrigerator at 2-8°C is not recommended.
How stable is Product D0564, Diphtheria Toxin from Corynebacterium diphtheriae, at low concentration?
For assays employing low concentration of the toxin, the use of a carrier protein like serum albumin is recommended.   
What is the molecular weight of Product D0564, Diphtheria Toxin from Corynebacterium diphtheriae?
In the presence of a reducing agent, on SDS gels, this preparation migrates as a major band of approx. mw 63,000 Daltons (corresponding to thte intact toxin) and two faster more lightly stained bands of approx. MW 39,000 and 24,000 Daltons (corresponding to the B and A fragments, respectively). Based on this method, the extent of the degree of nicking in this preparation is estimated to be less than 5%.
How do I find price and availability?
There are several ways to find pricing and availability for our products.  Once you log onto our website, you will find the price and availability displayed on the product detail page. You can contact any of our Customer Sales and Service offices to receive a quote.  USA customers:  1-800-325-3010 or view local office numbers. 
What is the Department of Transportation shipping information for this product?
Transportation information can be found in Section 14 of the product's (M)SDS. To access the shipping information for this material, use the link on the product detail page for the product, or search here. 
My question is not addressed here, how can I contact Technical Service for assistance?
Use the option to the right to "Ask a Question" by email of a Technical Service Scientist.
How is Product D0564-1MG, Diphtheria Toxin, packaged?
Product D0564-1MG, Diphtheria Toxin, is packaged in a small serum vial with a rubber or silicone septum and aluminum crimp top. The product can be reconstituted in the vial by piercing the septum with a syringe fitted with a stainless steel needle.
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