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P3101 Sigma

Protein L from Peptostreptococcus magnus

>95% (SDS-PAGE), recombinant, expressed in E. coli, essentially salt-free, lyophilized powder

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Properties

Related Categories Antibodies, Protein A, G and L Detection Reagents, Secondary Antibodies More...
recombinant   expressed in E. coli
assay   >95% (SDS-PAGE)
form   essentially salt-free, lyophilized powder
mol wt   mol wt 35.8 kDa
human IgG binding affinity   2 × 109-3 × 109 M-1
application(s)   indirect ELISA: 1:100,000
conjugate   unconjugated
storage temp.   2-8°C

Description

Reconstitution

Reconstitute with 5 mL PBS, pH 7.4 containing 15 mM sodium azide to yield a 1 mg/ml solution of Protein L. Other buffers may also be used for reconstitution. After reconstitution, the solution containing sodium azide may be stored at 2-8 °C for a maximum of 1 month.

Application

Protein L from Peptostreptococcus magnus is suitable for use in indirect ELISA (1:100,000). This product may also be used for immunohistochemistry in rat kidney sections .

Biochem/physiol Actions

Protein L from Peptostreptococcus magnus binds immunoglobulins (Ig) primarily through kappa light chain interactions without interfering with the antigen binding sites of Ig’s. This means that Protein L binds to a wider range of Ig classes and subclasses from a variety of species than any other commercially available Ig binding protein. It contains four Ig binding domains (B-domains). It may be used for the purification of IgG, IgM, IgA, IgE and IgD containing κ light chains and for the purification of Fab and scFv fragments containing κ light chains. It may be conjugated to a solid support for affinity purification or conjugated to marker molecules for use in detection. Protein L does not bind to bovine, sheep or goat immunoglobulins. For this reason it may be used for the purification of monoclonal antibodies from media supplemented with bovine serum albumin or fetal calf serum. It can also be used to purify human or mouse antibodies from goat, bovine or sheep proteins. A comprehensive list of binding properties is found in the product data sheet.

General description

Protein L is a cell wall protein of the bacterium, Peptostreptococcus magnus . This protein binds immunoglobulin (Ig) light chains in a wide range of species including human, mouse, rat, pig, hamster, and chicken, but has low affinity for Igs from guinea pig, and rabbit. This bacterial protein interacts with Ig light chains without blocking the antigen binding site of the Igs . Thus, protein L can be used for the detection of IgG, IgM, IgA, IgE and IgD containing κ light chains. It may also be used to detect Fab and scFv fragments containing κ light chains. Protein L does not bind to bovine, sheep or goat Igs. Hence, when bound to a solid support (sepharose) , protein L may be used to directly purify monoclonal antibodies from media supplemented with BSA or FCS, and also to directly purify human or mouse antibodies from goat, bovine or sheep proteins. rProtein L is a recombinant form of the native protein and contains two Ig binding protein L fragments.

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Amplified Detection
Safety & Documentation

Safety Information

RIDADR 
NONH for all modes of transport
WGK Germany 
3

Documents

Certificate of Analysis

Certificate of Origin

Protocols & Articles

Articles

Antibody Basics

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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

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