Antibody Purification

Antibody Purification

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Antigen Affinity Purification
Antigen of interest can be coupled to a solid support in order to specifically purify only antibodies that have affinity towards the antigen.
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IgG Purification using Protein A
Recombinant Protein A is an immunoglobulin-binding protein derived from the cell wall of the bacterium Staphylococcus aureus. It is composed of five homologous Ig-binding domains that fold into a three-helix bundle. Each domain is able to bind proteins from many of mammalian species, most notably IgGs. Protein A binds with high affinity to human IgG1 and IgG2 as well as mouse IgG2a and IgG2b. Protein A binds with moderate affinity to human IgM, IgA and IgE as well as to mouse IgG3 and IgG1. It does not react with human IgG3 or IgD, nor will it react to mouse IgM, IgA or IgE.
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IgG purification using Protein G
Recombinant Protein G is an immunoglobulin-binding protein derived from the cell wall of certain strains of b-hemolytic Streptococci. It binds with high affinity to the Fc portion of various classes and subclasses of immunoglobulins from a variety of species. The albumin and cell surface binding domains have been eliminated from Recombinant Protein G to reduce nonspecific binding and, therefore, can be used to separate IgG from crude samples. Due to its affinity for the Fc region of many mammalian immunoglobulins, protein G is a major application in purifying antibodies. Protein G is considered a universal reagent in biochemistry and immunology.
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