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82485 Sigma

Protein A (extracellular) from Staphylococcus aureus

lyophilized, ≥90% protein basis

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Properties

Related Categories Antibodies, Protein A, G and L Detection Reagents, Secondary Antibodies More...
assay   ≥90% protein basis
form   fibers
quality   lyophilized
mol wt   Mr ~41000
species reactivity   human, guinea pig, monkey, pig, mouse, dog, cat, rabbit
application(s)   ELISA: suitable
  immunohistochemistry: suitable
  immunoprecipitation: suitable
  western blot: suitable
conjugate   unconjugated
storage temp.   2-8°C
Gene Information   Staphylococcus aureus subsp. aureus NCTC 8325 ... SAOUHSC_00069(3919448)

Description

Other Notes

Protein A: nature′s universal anti-antibody - a review on properties and applications of protein A

Packaging

Bottomless glass bottle. Contents are inside inserted fused cone.

Application

Protein A may be conjugated with various reporter molecules such as fluorescent dyes (FITC), enzyme markers (peroxidase, beta-galactosidase, alkaline phosphatase), biotin, and colloidal gold without affecting the antibody binding site on the molecule. These conjugates may be used to detect immunoglobulins using immunochemical assays such as western blotting, immunohistochemistry, and ELISA. In addition, protein A may also be immobilized on a solid supports like agarose or acrylic beads for the purification of polyclonal or monoclonal immunoglobulins. It is also routinely used for immunoprecipitation assays. Furthermore, protein A has been used for affinity chromatography and SDS-PAGE assays.

General description

Protein A is a highly stable cell surface receptor produced by several strains of Staphylococcus aureus. This protein is capable of binding to the Fc portion of immunoglobulins, especially IgGs, from a large number of species. One protein A molecule has been shown to bind at least 2 molecules of IgG simultaneously. The IgG binding domain of Protein A consists of three anti-parallel alpha-helicies, the third of which is disrupted when the protein is complexed with the Fc region of the immunoglobulins. Protein A will bind the Fc portion of human IgG subclasses, IgM, IgA and IgE; and mouse IgG1 (weakly), IgG2a, and IgG2b. Protein A also associates with IgGs from other species, including monkey, rabbit, pig, guinea pig, dog, and cat.
Protein A is involved in regulating anti-tumor, toxic, and carcinogenic functions. In addition to acting as an immunomodulator, it also has antifungal and antiparasitic properties.

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Safety Information

RIDADR 
NONH for all modes of transport
WGK Germany 
3

Documents

Certificate of Analysis

Protocols & Articles

Articles

How to Choose a Secondary Antibody

The following information is provided to help you decide which secondary antibody may be best for your particular application.
Keywords: Amplification, Enzyme-linked immunosorbent assay, Flow cytometry, Immobilization, Immunocytochemistry, Immunofluorescence, Immunohistochemistry, Western blot

Secondary Antibodies, Conjugates and Kits

Secondary antibodies are polyclonal or monoclonal antibodies that bind to primary antibodies or antibody fragments, such as the Fc or Fab regions. They are typically labeled with probes that make the...
Keywords: Absorption, Adsorption, Amplification, Bacterial conjugations, Cancer, Digestions, Electrophoresis, Enzyme-linked immunosorbent assay, Flow cytometry, Gel electrophoresis, Gene expression, Hormones, Immobilization, Immunocytochemistry, Immunofluorescence, Immunohistochemistry, Immunology, Immunoprecipitation, Infrared spectroscopy, Microbiology, Microscopy, Purification, Vitamins, Western blot

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Peer-Reviewed Papers
15

References

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