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Three-dimensional crystal structure of recombinant murine interferon-beta
T Senda1, T Shimazu, S Matsuda
1Faculty of Engineering, Nagaoka University of Technology, Niigata, Japan.
The EMBO Journal
|September 1, 1992
Summary
The crystal structure of recombinant murine interferon-beta (IFN-beta) reveals a novel alpha-helix bundle topology. This structure provides insights into type I interferons and potential receptor binding sites.
Area of Science:
- Structural biology
- Biochemistry
- Immunology
Background:
- Interferon-beta (IFN-beta) is a crucial type I interferon with diverse biological functions.
- Understanding the three-dimensional structure of IFN-beta is essential for elucidating its mechanism of action.
- Previous structural information on type I interferons has been limited.
Purpose of the Study:
- To determine the high-resolution crystal structure of recombinant murine interferon-beta (IFN-beta).
- To identify the structural basis for the biological activity of IFN-beta.
- To compare the IFN-beta structure with other alpha-helical cytokines.
Main Methods:
- Multiple isomorphous replacement method for solving the crystal structure.
- X-ray diffraction data collection to 2.6 Angstrom resolution.
- Refinement of the crystal structure to an R-factor of 20.5%.
Main Results:
- The crystal structure of murine IFN-beta was solved, revealing a variant alpha-helix bundle with a novel chain-folding topology.
- This topology appears to be conserved across type I interferons (IFN-alpha and IFN-beta).
- Functionally significant regions are spatially clustered, suggesting potential receptor binding sites.
Conclusions:
- The determined structure provides a fundamental framework for type I interferons.
- The findings offer insights into the receptor interaction of IFN-beta.
- Structural comparisons with other helical cytokines highlight conserved and divergent features in protein architecture.