02153891 MP BIOMEDICALS

PROTEIN A, Fc BINDING GRADE

from Staphylococcus aureus

White Solid

Synonyms Protein A

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Description

Applications

Protein A may be conjugated with various reporter molecules including fluorescent dyes (FITC), enzyme markers (peroxidase, β-galactosidase, alkaline phosphatase), biotin, and colloidal gold without affecting the antibody binding site on the molecule. These conjugates are used to detect immunoglobulins in various immunochemical assays including western blotting, immunohistochemistry, and ELISA applications. In addition, protein A may be immobilized on a solid support such as agarose or acrylic beads for the purification of either polyclonal or monoclonal immunoglobulins. It is also routinely used for immunoprecipitation assays.


Product Description

Protein A is a recombinant Fc-binding protein from Staphlococcus aureus, Cowan strain-1 gene.The product is a carboxy truncated material containing 301 amino acid residues.The non-binding regions have been removed to minimize potenial steric interference.


Biochem/physiol Actions

Protein A is a highly stable cell surface receptor produced by several strains of Staphylococcus aureus. It consists of a single polypeptide chain of molecular weight 42 kDa, containing four repetitive domains rich in aspartic and glutamic acids but devoid of cysteine. It contains little or no carbohydrate and only 4 tyrosine residues and no tryptophans. Protein A 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 α-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 binds IgGs from other species, including monkey, rabbit, pig, guinea pig, dog, and cat. Protein A also participates in a number of different protective biological functions including anti-tumor, toxic, and carcinogenic activities. In addition to acting as an immunomodulator, it also has antifungal and antiparasitic properties.


Properties

Keywords Antibodies, Protein A Detection Reagents, Secondary Antibodies
Key Applications Detection of immunglobulins
Purification
Application Areas Cell Biology & Analysis; Molecular biology , Immunology
Research Areas Cell biology
Product Type Proteins, Enzymes & Peptides

Price and Availability

SKU-Pack Size Availability Price (USD) Quantity
0215389101 - 1 mg In Stock 44.25
0215389105 - 5 mg In Stock 149.15
0215389120 - 20 mg In Stock 512.05

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