Structure of Recombinant Protein A CAS 91932-65-9

Recombinant Protein A CAS 91932-65-9


CAS Number



Recombinant Protein A



White or off white powder

Safety Data

WGK Germany


Specifications and Other Information of Our Recombinant Protein A CAS 91932-65-9

Purity (HPLC)



Clear liquid


≤1 cfu/ mg

UV Spectrum

E275/250 ≥ 1.2

E0.1% at 275nm = 0.17-0.23


Single major band


25000±1000 Daltons


Protein A is a membrane protein of Staphylococcus aureus and can specifically bind to antibodies. Protein A affinity chromatography columns have become widely used as affinity columns for purified antibodies from ascites, serum and cell culture isolated or purified extracts of antibodies from different subtypes of mammals or genetically engineered recombinant proteins containing antibody Fc fragments. alkali protein A is our company independent research and development production, with independent intellectual property rights. Recombinant protein A is expressed by E. coli and purified by chromatography to give a purity of 95% or more. The purification process does not use antibody column affinity chromatography to avoid the possibility of incorporation of unrelated IgG in the product.


Protein A mutant of Staphylococcus aureus , expressed in E. coli

Stability of storage

Recombinant protein A lyophilized should be stored under 2-8℃ in sealed container. It is stable within 24 months.When gluing even with PBS (pH7.4) dissolved,it is now with the current use. After dissolved with pure water, it should be stored under -20℃.

Stability of transport

The product is stable by blue ice insulation transport.


1.Non-antibody column purification, the product without any other antibodies such as IgG and other pollution.
2.SPA-25 pH tolerance range, can withstand 0.5 M NaOH and 0.5M HCl treatment, no degradation, antibody binding capacity unchanged.
3.The product has a specially designed link for the purification of the column, can be directly used for the preparation of protein A column.
4.Stable quality: Mass production can ensure stable and continuous batch production.It is no difference between the batch and the product quality is stable.
5.High purity: Higher specific activity.Host protein residues is less than the limits of biological products.

Known Application

The C-terminus of the recombinant protein A contains cysteine which can be coupled to the solid separation medium for purification of the monoclonal antibody or polyclonal antibody. Recombinant protein A can be conjugated to a variety of reporter molecules (fluorescent dyes, enzyme labels, biotin, colloidal gold, radioactive labels, etc.) without affecting its binding to the antibody. These conjugated protein A derivatives can be used for antibody detection of Western-blot, ELISA, immunohistochemistry.

Watson International Ltd

This product is sold exclusively through our sales company Watson International Ltd, and please click the link below for details.