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Related Experiment Videos

Flavivirus capsid is a dimeric alpha-helical protein.

Christopher T Jones1, Lixin Ma, John W Burgner

  • 1Department of Biological Sciences, Purdue University, West Lafayette, Indiana 47907, USA.

Journal of Virology
|May 28, 2003
PubMed
Summary

Researchers studied yellow fever virus and dengue virus capsid proteins. Both proteins were found to be dimeric and largely alpha-helical, with dengue virus capsid protein featuring four alpha helices and an unstructured N-terminus.

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Area of Science:

  • Structural biology
  • Virology
  • Biochemistry

Background:

  • Flaviviruses, including yellow fever virus and dengue virus, pose significant global health threats.
  • Understanding the structural properties of viral capsid proteins is crucial for developing antiviral strategies.

Purpose of the Study:

  • To biochemically characterize and determine the structure of yellow fever virus and dengue virus capsid proteins.
  • To investigate the oligomeric state and secondary structure of these capsid proteins in solution.

Main Methods:

  • Expression and purification of capsid proteins from Escherichia coli.
  • Nuclear magnetic resonance (NMR) spectroscopy for structure determination.
  • Far-UV circular dichroism (CD) spectroscopy for secondary structure analysis.

Related Experiment Videos

  • Chemical shift indexing for secondary structure element determination in dengue virus capsid protein.

    • Main Results:

    • Both yellow fever virus and dengue virus capsid proteins were purified to near homogeneity.
    • In solution, without nucleic acid, both proteins existed predominantly as dimers.
    • Far-UV CD spectroscopy revealed that the proteins are largely alpha-helical.
    • The dengue virus capsid protein (without signal sequence) comprises four alpha helices, with an amphipathic C-terminal helix and an unstructured N-terminus.

    Conclusions:

    • The capsid proteins of yellow fever virus and dengue virus exhibit dimeric and alpha-helical structures in solution.
    • The dengue virus capsid protein has a defined four-helix bundle structure with a flexible N-terminus.
    • These findings provide insights into the structural organization of flavivirus capsid proteins, relevant for future therapeutic development.