• Purity

  >97%, by SDS-PAGE under reducing conditions and visualized by silver stain

• Endotoxin Level

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

• Activity

  Measured by its ability to induce myeloperoxidase release from cytochalasin B-treated human neutrophils. Schröder, J.M.     et al. (1987) J. Immunol.     139:3474. The ED    ₅₀ for this effect is 0.5‑1.5 µg/mL. Measured by its ability to chemoattract BaF3 mouse pro‑B cells transfected with human CXCR2. The ED    ₅₀ for this effect is 3‑15 ng/mL.

• Source

  E. coli-derived Val40-Asn114

• Accession #

• N-terminal Sequence    
  Analysis

  Val40

• Predicted Molecular Mass

  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: CXCL6/GCP-2

GCP-2 (granulocyte chemotactic protein-2) also known as CXCL6, is a CXC chemokine initially isolated as a neutrophil chemoattractant from the MG-63 osteosarcoma cell line. Among human CXC chemokines, GCP-2 is most closely related to ENA-78 (78% amino acid (aa) sequence identity in the mature peptide region and 86% identity in the signal sequence). The structure and sequence of the genes for human GCP-2 and ENA-78 also exhibit close similarity suggesting the two genes may have originated from a gene duplication. LIX (LPS-induced CXC chemokine) was initially cloned as a gene induced by LPS in mouse fibroblasts. The predicted LIX protein sequence is identical to a previously purified mouse protein designated mouse GCP-2 based on its amino sequence similarity (60% sequence identity) to human GCP-2. Mouse GCP-2/LIX is also 54% identical with human ENA-78 at the amino acid sequence level.

Human GCP-2 cDNA encodes a propeptide of 114 amino acid residues with a predicted 37 aa residue signal peptide and 77 aa residue mature protein. Several forms of natural GCP-2 have been isolated from MG-63 conditioned media, indicating that GCP-2 undergoes limited processing at both the N- and C-termini. Human GCP-2 is a primary response gene whose induction by cytokines is attenuated by dexamethasone.

Human GCP-2 and mouse GCP-2/LIX have been shown to chemoattract and activate neutrophils, but not eosinophils and monocytes. It is likely that GCP-2 activities are mediated via the human or mouse CXCR2.

• References:

1. Proost, P. et al. (1993) J. Immunol. 150:1000.

2. Smith, J.B. and H.R. Herschman (1995) J. Biol. Chem. 270:16756.

3. Rovai, L.E. et al. (1997) J. Immunol. 158:5257.

4. Wuyts, A. et al. (1997) J. Immunol. 157:1736.

• Entrez Gene IDs:

  6372 (Human)

• Alternate Names:

  chemokine (C-X-C motif) ligand 6 (granulocyte chemotactic protein 2); Chemokine alpha 3; CKA-3Granulocyte chemotactic protein 2; CXCL6; GCP-2; GCP2member 6 (granulocytechemotactic protein 2); GCP-2Small-inducible cytokine B6; Small inducible cytokine subfamily B (Cys-X-Cys), member b