Abstract
Flt3 ligand (FL) is an early-acting hematopoietic cytokine that stimulates the proliferation and differentiation of hematopoietic progenitor cells by activating its cognate receptor, Flt3. Recently, FL was shown to potently contribute to the development and expansion of antigen-presenting dendritic cells and CD34+ natural killer cell progenitors in vivo. Here, we report a comprehensive method for the production of bioactive recombinant human FL (rhFL) in E. coli, suitable for structural, biophysical and physiological studies. A soluble form of human FL capable of binding to the Ftl3 receptor could be overexpressed in the E. coli strain Rosetta-gami(DE3) as inclusion bodies. We have established protocols for the efficient in vitro refolding and ensuing purification of rhFL to homogeneity (>95%), with yields approaching 5 mg of pure rhFL per liter of culture. The ability of rhFL to adopt a bioactive conformation was confirmed via a cell-proliferation assay and the activation of the Flt3 receptor in the human leukemic cell line, OCI-AML3.
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Abbreviations
- Flt3:
-
FMS-like tyrosine kinase 3
- FL:
-
Flt3 ligand
- rhFL:
-
Recombinant human FL
- HSC:
-
Hematopoietic stem cells
- IL-3:
-
Interleukin-3
- SCF:
-
Stem cell factor
- G-CSF:
-
Granulocyte colony-stimulating factor
- GM-CSF:
-
Granulocyte-macrophage colony-stimulating factor
- M-CSF:
-
Macrophage colony-stimulating factor
- PDGFR:
-
Platelet-derived growth factor receptor
- VEGF:
-
Vascular endothelial growth factor
- AML:
-
Acute myelogenous leukemia
- CD:
-
Circular dichroism
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Acknowledgments
We are grateful to the Department of Ultrastructure at the Vrije Universiteit Brussel (Belgium) for access to CD-spectroscopy facilities. KV is a doctoral fellow of the Fund for Scientific Research-Flanders, Belgium (FWO). This work was supported by research grants from the FWO (G.0643.07) and Ghent University (BOF01Z01705) to S.N.S., and from the German Research Foundation (SFB 655 TP16) to C.T.
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Verstraete, K., Koch, S., Ertugrul, S. et al. Efficient Production of Bioactive Recombinant Human Flt3 Ligand in E. coli . Protein J 28, 57–65 (2009). https://doi.org/10.1007/s10930-009-9164-5
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DOI: https://doi.org/10.1007/s10930-009-9164-5