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Structural characterization of fibroblast human interferon-beta 1.
K Hosoi1, J Utsumi, T Kitagawa
1Basic Research Laboratories, Toray Industries, Inc., Kamakura, Japan.
Journal of Interferon Research
|June 1, 1988
Summary
Fibroblast human interferon-beta 1 (IFN-beta 1) primary structure was confirmed, revealing no carboxy-terminal cleavages. Raman spectroscopy characterized its higher-order structure, including an unpaired cysteine residue and alpha-helical content.
Area of Science:
- Biochemistry
- Structural Biology
- Immunology
Background:
- Interferon-beta 1 (IFN-beta 1) is a crucial protein in the innate immune response.
- Understanding the precise structure of IFN-beta 1 is essential for its therapeutic applications.
Purpose of the Study:
- To determine the complete amino acid sequence of fibroblast human IFN-beta 1.
- To characterize the higher-order structure of IFN-beta 1 using Raman spectroscopy.
- To investigate potential post-translational modifications and disulfide bond formation.
Main Methods:
- Amino acid sequencing to confirm the primary structure.
- Raman spectroscopy for higher-order structural analysis.
- Detection of glucosamines and S-carboxymethyl cysteine for post-translational modifications.
Main Results:
- The amino acid sequence matched the cDNA-deduced sequence, with no carboxy-terminal proteolytic cleavages.
- N-glycosylation was confirmed at Asn-80.
- An unpaired cysteine at position 17 was detected, along with one disulfide bond.
- Raman spectra indicated a predominantly alpha-helical structure.
Conclusions:
- The study provides strong evidence for the primary and higher-order structures of natural IFN-beta 1.
- The findings clarify structural features, including glycosylation and cysteine pairing, relevant to IFN-beta 1 function.
- This detailed structural information aids in understanding IFN-beta 1's biological activity and potential therapeutic development.