Protein L (PE-Cy® 7 Conjugate) #31536
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Product Information
Product Usage Information
Storage
Protocol
Product Description
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).
Limited Uses
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