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Related Experiment Video

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Specific inter-domain interactions stabilize a compact HIV-1 Gag conformation.

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  • 1Department of Chemistry and Biochemistry, University of California Los Angeles, Los Angeles, CA, United States of America.

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Summary

HIV-1 Gag protein

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Area of Science:

  • Structural biology
  • Virology
  • Biophysics

Background:

  • HIV-1 Gag is a large poly-protein crucial for viral assembly.
  • Gag transitions from a compact state in solution to an extended conformation in virions.

Purpose of the Study:

  • To characterize the intra-domain interactions of HIV-1 Gag using molecular dynamics simulations.
  • To identify and analyze novel binding sites within the Gag poly-protein.

Main Methods:

  • Molecular dynamics (MD) simulations were employed to study Gag's conformational dynamics.
  • Free energy calculations quantified interaction strengths between Gag domains.
  • Sequence analysis identified conserved regions within potential binding sites.

Main Results:

  • A stable bound state between the matrix (MA) domain and the C-terminal subdomain of the CA capsid domain (CActd) was identified.
  • This MA/CActd interaction is stabilized by complementary charged and polar residues, significantly stronger than CActd dimerization.
  • The binding site is highly conserved and spatially proximal to known functional regions of Gag.

Conclusions:

  • A novel, conserved intra-Gag binding site (MA/CActd) stabilizes the compact Gag conformation.
  • This interaction may play a critical role in the selective packaging of genomic RNA by HIV-1 Gag.