Reactivity | MuSpecies Glossary |
Applications | Bioactivity |
Details of Functionality | Measured by its ability to chemoattract BaF3 mouse pro‑B cells transfected with human CXCR4. The ED50 for this effect is 0.15-0.6 ng/mL. Measured by its ability to chemoattract 5-10 day cultured human peripheral blood lymphocytes (PBL). The ED50 for this effect is 3-9 ng/mL. |
Source | E. coli-derived mouse CXCL12/SDF-1 alpha protein Lys22-Lys89 |
Accession # | |
N-terminal Sequence | Lys22 |
Protein/Peptide Type | Recombinant Proteins |
Gene | Cxcl12 |
Purity | >97%, by SDS-PAGE visualized with Silver Staining and quantitative densitometry by Coomassie® Blue Staining. |
Endotoxin Note | <0.01 EU per 1 μg of the protein by the LAL method. |
Dilutions |
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Theoretical MW | 8 kDa. Disclaimer note: The observed molecular weight of the protein may vary from the listed predicted molecular weight due to post translational modifications, post translation cleavages, relative charges, and other experimental factors. |
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Publications |
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Storage | Use a manual defrost freezer and avoid repeated freeze-thaw cycles.
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Buffer | Lyophilized from a 0.2 μm filtered solution in Acetonitrile and TFA with BSA as a carrier protein. |
Purity | >97%, by SDS-PAGE visualized with Silver Staining and quantitative densitometry by Coomassie® Blue Staining. |
Reconstitution Instructions | Reconstitute at 100 μg/mL in sterile PBS containing at least 0.1% human or bovine serum albumin. |
SDF-1 alpha and SDF-1 beta , members of the chemokine alpha subfamily that lack the ELR domain, were initially identified using the signal sequence trap cloning strategy from a mouse bone-marrow stromal cell line. These proteins were subsequently also cloned from a human stromal cell line as cytokines that supported the proliferation of a stromal cell‑dependent pre-B-cell line, and were named Pre‑B‑Cell Growth Stimulating Factor (PBSF). SDF‑1 alpha and SDF‑1 beta cDNAs encode precursor proteins of 89 and 93 amino acid residues, respectively. Both SDF-1 alpha and SDF‑1 beta are encoded by a single gene and arise by alternative splicing. The two proteins are identical except for the four amino acid residues that are present in the carboxy‑terminus of SDF-1 beta and absent from SDF‑1 alpha . SDF‑1/PBSF is highly conserved between species, with only one amino acid substitution between the mature human and mouse proteins. SDF‑1/PBSF acts via the chemokine receptor CXCR4 and has been shown to be a chemoattractant for T‑lymphocytes, monocytes, pro- and pre- B cells, but not neutrophils. Mice lacking SDF-1 or CXCR4 have been found to have impaired B‑lymphopoiesis, myelopoiesis, vascular development, cardiogenesis and abnormal neuronal cell migration and patterning in the central nervous system.
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