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Related Experiment Videos

Actin-binding cellular proteins inside human immunodeficiency virus type 1.

D E Ott1, L V Coren, D G Johnson

  • 1SAIC Frederick, National Cancer Institute, Frederick, Maryland, 21702-1201, USA. ott@avpvx1.ncifcrf.gov

Virology
|December 29, 1999
PubMed
Summary

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Researchers identified cellular proteins within human immunodeficiency virus type 1 (HIV-1) virions using protease treatment. These findings suggest actin filaments may be incorporated into HIV-1, impacting viral assembly and budding.

Area of Science:

  • Virology
  • Cell Biology
  • Biochemistry

Background:

  • Host proteins are integral components of human immunodeficiency virus type 1 (HIV-1) virions, found both externally and internally.
  • Understanding the internal proteome of HIV-1 is crucial for elucidating viral assembly, maturation, and infection mechanisms.

Purpose of the Study:

  • To identify and characterize cellular proteins residing inside HIV-1 virions.
  • To investigate the potential role of these internal proteins, particularly actin-binding proteins, in viral lifecycle.

Main Methods:

  • Protease-digestion technique to remove surface-bound host proteins from HIV-1 virions.
  • Analysis of internal proteins using immunoblotting, high-pressure liquid chromatography (HPLC), and protein sequencing.
  • Identification of protein fragments resulting from protease treatments or viral/cellular proteases.

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Main Results:

  • Several cellular proteins were identified inside HIV-1, including elongation factor 1alpha, glyceraldehyde-3-phosphate dehydrogenase, and Pin1.
  • Identified proteins include HS-1, phosphatidylethanolamine-binding protein, Lck, Nm23-H1, and the C-terminal tail of CD43.
  • Some identified proteins were fragmented, suggesting enzymatic processing during or after virion preparation.
  • A subset of these proteins are known actin-binding proteins.

Conclusions:

  • The presence of actin-binding proteins supports the hypothesis that actin filaments are incorporated into HIV-1 virions.
  • These findings offer new insights into the complex interactions between viral and cellular proteins during HIV-1 assembly and budding.
  • Further research into these internal viral components could reveal novel therapeutic targets for HIV-1 infection.