• Purity

  >95%, by SDS-PAGE under reducing conditions and visualized by silver stain

• Endotoxin Level

  <0.01 EU per 1 μg of the protein by the LAL method.  

• Activity

  Measured by its ability to chemoattract BaF3 mouse pro‑B cells transfected with human CXCR5. The ED    ₅₀ for this effect is 0.005‑0.02 µg/mL.

• Source

  E. coli-derived Val23-Arg94

• Accession #

• N-terminal Sequence    
  Analysis

  Val23

• Predicted Molecular Mass

  8.7 kDa

• SDS-PAGE

  9 kDa, reducing conditions

Carrier Free

What does CF mean?

CF stands for Carrier Free (CF). We typically add Bovine Serum Albumin (BSA) as a carrier protein to our recombinant proteins. Adding a carrier protein enhances protein stability, increases shelf-life, and allows the recombinant protein to be stored at a more dilute concentration. The carrier free version does not contain BSA.

What formulation is right for me?

In general, we advise purchasing the recombinant protein with BSA for use in cell or tissue culture, or as an ELISA standard. In contrast, the carrier free protein is recommended for applications, in which the presence of BSA could interfere.

Background: CXCL13/BLC/BCA-1

CXCL13, also known as B-lymphocyte chemoattractant (BLC), is a CXC chemokine that is constitutively expressed in secondary lymphoid organs. BCA-1 cDNA encodes a protein of 109 amino acid residues with a leader sequence of 22 residues. Mature human BCA-1 shares 64% amino acid sequence similarity with the mouse protein and 23 - 34% amino acid sequence identity with other known CXC chemokines. Recombinant or chemically synthesized BCA-1 is a potent chemoattractant for B lymphocytes but not T lymphocytes, monocytes or neutrophils. BLR1, a G protein-coupled receptor originally isolated from Burkitt’s lymphoma cells, has now been shown to be the specific receptor for BCA-1. Among cells of the hematopoietic lineages, the expression of BLR1, now designated CXCR5, is restricted to B lymphocytes and a subpopulation of T helper memory cells. Mice lacking BLR1 have been shown to lack inguinal lymph nodes. These mice were also found to have impaired development of Peyer’s patches and defective formation of primary follicles and germinal centers in the spleen as a result of the inability of B lymphocytes to migrate into B cell areas.

• References:

1. Gunn, M.D. et al. (1998) Nature, 391:799.

2. Legler, D.F. et al. (1998) J. Exp. Med. 187:655.

3. Forster, R. et al. (1996) Cell 87:1037.

• Entrez Gene IDs:

  10563 (Human); 55985 (Mouse)

• Alternate Names:

  ANGIE; ANGIE2; B cell-attracting chemokine 1; B lymphocyte chemoattractant; BCA1; BCA-1; BCA1B-cell chemoattractant; BCA-1CXC chemokine BLC; B-cell-homing chemokine (ligand for Burkitt's lymphoma receptor-1); BLC; BLCSmall-inducible cytokine B13; BLR1L; B-lymphocyte chemoattractant; chemokine (C-X-C motif) ligand 13 (B-cell chemoattractant); chemokine (C-X-C motif) ligand 13; C-X-C motif chemokine 13; CXCL13; SCYB13B-cell-attracting chemokine 1; small inducible cytokine B subfamily (Cys-X-Cys motif), member 13 (B-cellchemoattractant)