Protein aggregation is a major stability problem of therapeutic proteins. We investigated whether a novel stabilizing peptide [acidic tail of synuclein (ATS) peptide] could be generally used to make a more stable and soluble form of therapeutic proteins, particularly those having solubility or aggregation problems.
We produced ATS fusion proteins by fusing the stabilizing peptide to three representative therapeutic proteins, and then compared the stress-induced aggregation profiles, thermostability, and solubility of them. We also compared the in vivo stability of these ATS fusion proteins by studying their pharmacokinetics in rats.
The human growth hormone–ATS (hGH–ATS) and granulocyte colony-stimulating factor–ATS (G-CSF–ATS) fusion proteins were fully functional as determined by cell proliferation assay, and the ATS fusion proteins seemed to be very resistant to agitation, freeze/thaw, and heat stresses. The introduction of the ATS peptide significantly increased the storage and thermal stabilities of hGH and G-CSF. The human leptin–ATS fusion protein also seemed to be very resistant to aggregation induced by agitation, freeze/thaw, and heat stresses. Furthermore, the ATS peptide greatly increased the solubility of the fusion proteins. Finally, pharmacokinetic studies in rats revealed that the ATS fusion proteins are also more stable in vivo.
Our data demonstrate that a more stable and soluble form of therapeutic proteins can be produced by fusing the ATS peptide.
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acidic tail of synuclein
granulocyte colony-stimulating factor
human growth hormone
temperature for the onset of unfolding
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We thank Dr. S.M. Park and K.J. Ahn for their technical assistance. This work was supported in part by a grant (R13-2002-054-02002-0) from the basic research program of the KOSEF.
E. N. Lee and Y. M. Kim equally contributed to this work.
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Lee, E.N., Kim, Y.M., Lee, H.J. et al. Stabilizing Peptide Fusion for Solving the Stability and Solubility Problems of Therapeutic Proteins. Pharm Res 22, 1735–1746 (2005). https://doi.org/10.1007/s11095-005-6489-4
- protein aggregation
- protein solubility
- protein stability
- stabilizing peptide
- therapeutic proteins