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Related Experiment Videos

Three-dimensional structure of recombinant human interferon-gamma.

S E Ealick1, W J Cook, S Vijay-Kumar

  • 1Department of Pharmacology, University of Alabama, Birmingham 35294.

Science (New York, N.Y.)
|May 3, 1991
PubMed
Summary

The crystal structure of human interferon-gamma reveals a dimeric form stabilized by intertwined alpha helices. This research provides key insights into the protein

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Area of Science:

  • Structural biology
  • Protein crystallography
  • Immunology

Background:

  • Interferon-gamma (IFN-γ) is a critical cytokine involved in immune responses.
  • Understanding the three-dimensional structure of IFN-γ is essential for elucidating its function and interactions.
  • Previous studies indicated IFN-γ exists as a dimer in solution.

Purpose of the Study:

  • To determine the high-resolution X-ray crystal structure of recombinant human interferon-gamma.
  • To characterize the quaternary structure and secondary structural elements of IFN-γ.
  • To investigate the molecular interactions stabilizing the dimeric form of IFN-γ.

Main Methods:

  • X-ray crystallography was employed to determine the protein structure.
  • Multiple-isomorphous-replacement techniques were utilized for phase determination.

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  • Crystallographic data were analyzed to resolve the atomic coordinates of IFN-γ.

    • Main Results:

    • The crystal structure revealed human interferon-gamma is primarily alpha helical, with six helices per subunit (approx. 62% of structure).
    • No beta sheet structures were observed in the determined crystal structure.
    • The asymmetric unit contained two dimers, related by a noncrystallographic twofold axis, confirming a dimeric quaternary structure.
    • The dimeric structure is stabilized by extensive inter-subunit interactions, including intertwined helices.

    Conclusions:

    • The determined crystal structure provides a detailed molecular model of human interferon-gamma.
    • The structural data highlights the importance of alpha helices and inter-subunit helix intertwining in stabilizing the functional dimeric form of IFN-γ.
    • This structural information can inform future studies on IFN-γ function, receptor binding, and therapeutic development.