Reactivity | HuSpecies Glossary |
Applications | Bioactivity |
Details of Functionality | Measured in a cell proliferation assay using NFS‑60 mouse myelogenous leukemia lymphoblast cells. Shirafuji, N.et al. (1989) Exp. Hematol. 17:116. The ED50 for this effect is 10-60 pg/mL. |
Source | E. coli-derived human G-CSF protein Thr31-Pro204, with an N-terminal Met |
Accession # | |
N-terminal Sequence | Met |
Protein/Peptide Type | Recombinant Proteins |
Gene | CSF3 |
Purity | >97%, by SDS-PAGE under reducing conditions and visualized by silver stain. |
Endotoxin Note | <0.10 EU per 1 μg of the protein by the LAL method. |
Dilutions |
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Theoretical MW | 18.8 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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SDS-PAGE | 17-19 kDa, reducing conditions |
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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 Acetic Acid with BSA as a carrier protein. |
Purity | >97%, by SDS-PAGE under reducing conditions and visualized by silver stain. |
Reconstitution Instructions | Reconstitute at 50 μg/mL in sterile PBS containing at least 0.1% human or bovine serum albumin. |
In humans, two distinct cDNA clones for G-CSF, encoding 207 and 204 amino acid precursor proteins, have been isolated. Both proteins have a 30 amino acid signal peptide and have identical amino acid sequences except for a three amino acid insertion (deletion) at the 35th amino acid residue from the N-terminus of the mature protein. Human G-CSF is 73% identical at the amino acid level to murine G-CSF and the two proteins show species cross-reactivity.
In vitro, G-CSF stimulates growth, differentiation and functions of cells from the neutrophil lineage. It also has blast cell growth factor activity and can synergize with IL-3 to shorten the Go period of early hematopoietic progenitors. Consistent with its in vitro functions, G-CSF has been found to play important roles in defense against infection, in inflammation and repair, and in the maintenance of steady state hematopoiesis.
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