Abstract
Recombinant human BMP-4 growth factor (GF) has significant commercial potential as therapeutic for regenerating bone and as cell culture supplement. However, its commercial utility has been limited as large-scale attempts to express and purify human BMP-4 GF have proved challenging. We have established a novel approach to obtain significant quantities of pure and bioactive BMP-4 GF from Chinese hamster ovary cell cultures by extracting the GF moiety from the extracellular matrix or cell pellet fraction. This approach increased yields approximately one 100-fold over BMP-4 GF purified from CM. The molecular activities of the two fractions are indistinguishable. We further analyzed binding of BMP-4 GF to the proteoglycan Heparin and showed that an N-terminal basic sequence is essential for this interaction. Taken together, these results provide novel insights into the purification, localization, and Heparin binding of human BMP-4 that have implications for its bioprocessing and biological function.
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This work was funded by NIH Grant R01 GM121499 to EMH.
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SA and JM designed, performed, and analyzed experiments; EMH designed and analyzed experiments; EMH wrote manuscript.
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EMH holds shares of Acceleron Pharma. EMH is a shareholder and co-founder of Advertent Biotherapeutics. SA is an employee and holds stock options of Regeneron Pharma. JM has no competing interests.
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Aykul, S., Maust, J. & Martinez-Hackert, E. BMP-4 Extraction from Extracellular Matrix and Analysis of Heparin-Binding Properties. Mol Biotechnol 64, 156–170 (2022). https://doi.org/10.1007/s12033-021-00403-x
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DOI: https://doi.org/10.1007/s12033-021-00403-x