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Related Experiment Videos

Viral proteins in cell fusion.

A Asano, K Asano

    The Tokai Journal of Experimental and Clinical Medicine
    |January 1, 1982
    PubMed
    Summary

    The N-terminal hydrophobic region of Sendai virus fusion (F) glycoprotein is crucial for viral fusion and hemolysis. This region likely interacts directly with target cell membranes to mediate viral entry.

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    Multigenic control of resistance to Sendai virus infection in mice.

    Infection, genetics and evolution : journal of molecular epidemiology and evolutionary genetics in infectious diseases·2009

    Area of Science:

    • Virology
    • Molecular Biology
    • Biochemistry

    Background:

    • Sendai virus (HVJ) utilizes hemagglutinin and neuraminidase (HANA) and fusion (F) glycoproteins for infection.
    • The F glycoprotein mediates viral entry through cell fusion and hemolysis.

    Purpose of the Study:

    • To investigate the role of the N-terminal hydrophobic region of the F1 subunit of HVJ F glycoprotein in viral activity.
    • To elucidate the mechanism of viral envelope and cell membrane fusion.

    Main Methods:

    • Purification and characterization of HVJ F and HANA glycoproteins.
    • Enzymatic digestion (chymotrypsin, thermolysin, trypsin) and chemical modification (iodination) of F glycoprotein.
    • Circular dichroism spectroscopy to assess structural changes.

    Main Results:

    • Cleavage of a 2.5-3.5 kDa segment from the F1 N-terminus inactivated hemolytic and fusion activities.
    • The N-terminal region is accessible to proteases and iodination, suggesting surface exposure.
    • Tryptic digestion altered F glycoprotein structure, burying the N-terminal hydrophobic region.

    Conclusions:

    • The N-terminal hydrophobic region of the F1 subunit is essential for HVJ's hemolytic and cell fusion activities.
    • A model is proposed where this hydrophobic region directly interacts with target cell lipid bilayers to facilitate membrane fusion.

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