Abstract
Fourier-transform infrared spectroscopy, in vitro bioassay and enzyme-linked immunoassay were used to study the structural-functional relationships of recombinant mink growth hormone (mGH), refolded and stored under different conditions. Porcine GH (pGH) was synthesized and used as an example. These two hormones, when refolded and stored the same way, had the same secondary structures, biological and immunological efficacy, and biological potency. Only the immunological potency differed, mGH being significantly less potent than pGH. Renaturation pH and storing frozen or at 4 °C in 5% glycerol did not affect either the secondary structure or the activity. However, freeze-drying raised the content of buried α-helices and lowered that of solvated α-helices and of unordered structures. These conformational changes were associated with a reduction of immunological and biological potency of mGH and of immunological potency of pGH. These findings provide original information on the secondary structure of mGH, and show that conformational changes induced by lyophilization adversely affect its activity.
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Abbreviations
- Amide I′:
-
Amide I in 2H2O medium
- FT-IR:
-
Fourier-transform infrared
- GH:
-
Growth hormone
- mGH:
-
Mink growth hormone
- pGH:
-
Porcine growth hormone
- GH-8-F:
-
GH refolded at pH 8.0, stored frozen
- GH-8-L:
-
GH refolded at pH 8.0, stored lyophilized at 4 °C
- GH-9-F:
-
GH refolded at pH 9.0, stored frozen
- GH-9-G:
-
GH refolded at pH 9.0, stored at 4 °C, 5 % glycerol
- GH-9-L:
-
GH refolded at pH 9.0, stored lyophilized at 4 °C
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Borromeo, V., Sereikaite, J., Bumelis, VA. et al. Mink Growth Hormone Structural–Functional Relationships: Effects of Renaturing and Storage Conditions. Protein J 27, 170–180 (2008). https://doi.org/10.1007/s10930-007-9120-1
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DOI: https://doi.org/10.1007/s10930-007-9120-1