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High-throughput Quantitative Real-time RT-PCR Assay for Determining Expression Profiles of Types I and III Interferon Subtypes
Published on: March 24, 2015
Factors affecting the dissociation and aggregation of human interferon gamma
T Zlateva1, R Boteva, B Salvato
1CNR Centre of Metalloproteins, Department of Biology, University of Padua, Italy.
International Journal of Biological Macromolecules
|January 11, 2000
Summary
Interferon gamma (IFN-gamma) stability is affected by blood plasma electrolytes and mechanical stress. Monomers are less fluorescent than dimers, and stress can cause irreversible damage and aggregation.
Area of Science:
- Biochemistry
- Protein Chemistry
- Biophysics
Background:
- The biologically active form of interferon gamma (IFN-gamma) is a dimer.
- Monomeric IFN-gamma exhibits reduced tryptophan (Trp) quantum yield compared to dimers.
- Understanding IFN-gamma's conformational states is crucial for its function.
Purpose of the Study:
- To characterize the conformational properties of monomeric and dimeric IFN-gamma.
- To analyze the impact of blood plasma salt composition on the dimer-monomer equilibrium.
- To investigate the effects of physiological cations (K+, Na+, Ca2+, Mg2+) and mechanical stress on IFN-gamma stability.
Main Methods:
- Spectroscopic analysis (Trp fluorescence)
- Characterization of conformational properties
- Investigation of dimer-monomer dissociation equilibrium
Main Results:
- Blood plasma electrolyte composition affects association and dissociation rates but not equilibrium.
- Physiological cations shift equilibrium towards dissociation, reducing IFN-gamma stability.
- Mechanical stress irreversibly reduces Trp fluorescence, decreases alpha-helical content, and promotes aggregation.
Conclusions:
- IFN-gamma stability is sensitive to its environment, particularly physiological cations and mechanical stress.
- Dissociation into monomers and subsequent aggregation can be induced by stress.
- These findings have implications for understanding IFN-gamma behavior in biological systems and during protein handling.
