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Purification of IgG Using Protein A or Protein G

  • Mark Page
  • Robin Thorpe
Protocol
Part of the Springer Protocols Handbooks book series (SPH)

Abstract

Some strains of Staphylococcus aureus synthesize protein A, a group-specific ligand that binds to the Fc region of IgG from many species (1,2). Protein A does not bind all subclasses of IgG, e.g., human IgG3, mouse IgG3, sheep IgG1, and some subclasses bind only weakly, e.g., mouse IgG1. For some species, IgG does not bind to protein A at all, e.g., rat, chicken, goat, and some MAbs show abnormal affinity for the protein. These properties make the use of protein A for IgG purification limited in certain cases, although it can be used to an advantage in separating IgG subclasses from mouse serum (3). Protein G (derived from groups C and G Streptococci) also binds to IgG Fc with some differences in species specificity from protein A. Protein G binds to IgG of most species, including rat and goat, and recognizes most subclasses (including human IgG3 and mouse IgG1), but has a lower binding capacity. Protein G also has a high affinity for albumin, although recombinant DNA forms now exist in which the albumin-binding site has been spliced out, and are therefore very useful for affinity chromatography.

Keywords

Affinity Chromatography Sodium Azide Binding Buffer Mouse IgG1 Ascitic Fluid 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

References

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    Ey, P. L., Prowse, S. J., and Jenkin, C. R. (1978) Isolation of pure IgG1, IgG2a, and IgG2b immunoglobulins from mouse serum using protein A-sepharose. Immunochemistry 15, 429–436.PubMedCrossRefGoogle Scholar
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    Kerr, M. A., Loomes, L. M., and Thorpe, S. J. (1994) Purification and fragmentation of immunoglobulins, in Immunochemistry Labfax (Kerr, M. A. and Thorpe, R., eds.), Bios Scientific, Oxford, UK, pp. 83–114.Google Scholar

Copyright information

© Humana Press Inc., Totowa, NJ 1996

Authors and Affiliations

  • Mark Page
    • 1
  • Robin Thorpe
    • 2
  1. 1.MEDEVA, Vaccine Research Unit, Department of BiochemistryImperial College of Science, Technology, and MedicineLondonUK
  2. 2.National Institute for Biological Standards and ControlPotters BarUK

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