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Protein L (PE-Cy® 7 Conjugate) #31536

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Flow Cytometry Image 1: Protein L (PE-Cy® 7 Conjugate)
Flow cytometric analysis of a mixed population containing live wild-type Jurkat cells and Jurkat cells engineered to stably express an scFv-based Anti-CD20 CAR, using Protein L (PE-Cy® 7 Conjugate). Tag Blue fluorescent protein (TagBFP) is co-expressed with the CAR. CAR cell line was provided by the Lohmueller Lab, University of Pittsburgh.

To Purchase # 31536

Cat. # Size Qty. Price Ships
31536L 100 µl
50 tests
$81
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Product Information

Product Usage Information

Recommended Dilution: 1:50

Storage

Supplied in PBS (pH 7.2), less than 0.1% sodium azide, and 2 mg/mL BSA. Store at 4°C. Do not aliquot the antibody. Protect from light. Do not freeze.

Protocol

Product Description

This Cell Signaling Technology® product is conjugated to phycoerythrin in combination with cyanine 7 (PE-Cy® 7) under optimal conditions.

Specificity / Sensitivity

Protein L (PE-Cy® 7 Conjugate) is recombinantly derived and genetically engineered such as to remove the cell wall-, cell membrane-, and albumin-binding regions of Protein L to enhance binding to immunoglobulins. Conjugation to PE-Cy® 7 makes this product ideally suited for direct flow cytometric analysis of cells expressing κ light chain-containing immunoglobulins as well as immunoglobulin fragments that contain κ light chains, such as scFvs.

Species Reactivity:

All Species Expected

Background

Protein L was first isolated from the surface of bacterial species Peptostreptococcus magnus (1). Unlike Protein A and Protein G, which differentially bind to the Fc region of immunoglobulin isotype heavy chains, Protein L contains Ig binding domains that interact with the κ light chain variable domain without disrupting paratope function (2-4). This attribute not only facilitates binding to a broader range of immunoglobulin classes and subclasses than either Protein A or Protein G but also allows for binding to Fab fragments and single chain variable fragments (scFvs) that contain κ light chain sequences. Protein L does, however, display specificity with respect to κ light chain subtypes. In human, Protein L binds to VκI, VκIII, and VκIV subtypes, whereas binding is restricted to VκI in mice (4).
For Research Use Only. Not For Use In Diagnostic Procedures.
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