• Purity

  >97%, by SDS-PAGE visualized with Silver Staining and quantitative densitometry by Coomassie? Blue Staining.

• Endotoxin Level

  <0.10 EU per 1 μg of the protein by the LAL method.  

• Activity

  Measured by its ability to chemoattract 5-10 day cultured human peripheral blood lymphocytes (PBL). The ED    ₅₀ for this effect is 0.1-0.3 μg/mL. Measured by its ability to chemoattract BaF3 mouse pro?B cells transfected with human CCR7. The ED    ₅₀ for this effect is 3-15 ng/mL.

• Source

  E. coli-derived Gly22-Ser98

• Accession #

• N-terminal Sequence    
  Analysis

  Gly22

• Predicted Molecular Mass

  8.8 kDa

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: CCL19/MIP-3 beta

MIP-3 beta, also known as ELC (EBI1-Ligand Chemokine), is one of many novel beta chemokines identified through bioinformatics. MIP-3 beta cDNA encodes a 98 amino acid (aa) residue precursor protein with a predicted 21 aa residue signal peptide that is cleaved to form the 77 aa residue mature secreted protein. MIP-3 beta is distantly related to other beta chemokines (20-30% aa sequence identity) and the gene for MIP-3 beta  has been mapped to chromosome 9p13 rather than chromosome 17 where the genes for many human beta chemokines are clustered. MIP-3 beta has been shown to be constitutively expressed in various lymphoid tissues (including thymus, lymph nodes, appendix and spleen). The expression of MIP-3 beta is down-regulated by the anti-inflammatory cytokine IL-10. Recombinant MIP-3 beta has been shown to be chemotactic for cultured human lymphocytes. MIP-3 beta has also been shown to be a unique functional ligand for CCR-7 (previously referred to as the Epstein-Barr virus-induced gene 1 (EBI1) orphan receptor), a chemokine receptor that is expressed in various lymphoid tissues and activated B and T lymphocytes. EBI1 is strongly up-regulated in B cells infected with Epstein-Barr virus and T cells infected with herpesvirus 6 or 7.

• References:

1. Yoshida, R. et al. (1997) J. Biol. Chem. 272:13803.

• Entrez Gene IDs:

  6363 (Human); 24047 (Mouse); 362506 (Rat)

• Alternate Names:

  beta chemokine exodus-3; Beta-chemokine exodus-3; CC chemokine ligand 19; C-C motif chemokine 19; CCL19; chemokine (C-C motif) ligand 19; CKb11; EBI1-ligand chemokine; ELC; ELCMIP-3-beta; Epstein-Barr virus-induced molecule 1 ligand chemokine; exodus-3; Macrophage inflammatory protein 3 beta; macrophage inflammatory protein 3-beta; MGC34433; MIP3 beta; MIP-3 beta; MIP-3b; MIP3BCK beta-11; SCYA19EBI1 ligand chemokine; small inducible cytokine subfamily A (Cys-Cys), member 19; Small-inducible cytokine A19