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Area of Science:

  • Virology
  • Cell Biology
  • Molecular Biology

Background:

  • HIV-1 entry into host cells triggers signaling cascades.
  • Understanding these early signaling events is crucial for identifying host factors that support viral replication.

Purpose of the Study:

  • To globally map signaling events induced by HIV-1 entry into primary human CD4(+) T cells.
  • To identify novel host factors and pathways manipulated by HIV-1 during the initial stages of infection.

Main Methods:

  • Quantitative phosphoproteomics was employed to profile protein phosphorylation changes in CD4(+) T cells post-HIV-1 infection.
  • RNA interference (RNAi) depletion studies were used to validate identified host factors.
  • Mechanistic studies focused on specific proteins, such as SRm300 (SRRM2).

Main Results:

  • Over 1,700 phosphorylation sites were quantified, with 239 sites from 175 genes showing significant changes within one minute of HIV-1 exposure.
  • Previously unknown HIV-1 host factors were identified.
  • Differential phosphorylation of five serine/arginine-rich (SR) proteins, including SRm300, involved in mRNA splicing, was observed.

Conclusions:

  • HIV-1 entry rapidly alters host cell signaling networks.
  • The virus hijacks the host cell's mRNA splicing machinery, specifically targeting SR proteins like SRm300, to facilitate its replication and release.