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Does BCA3 Play a Role in the HIV-1 Replication Cycle?

Michaela Rumlová1, Ivana Křížová2, Jaroslav Zelenka3

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|April 21, 2018
PubMed
Summary

Breast carcinoma-associated protein 3 (BCA3) is packaged into HIV-1 particles via interaction with protein kinase A (PKAc). The C-terminus of BCA3 is essential for this incorporation, but it does not affect HIV-1 infectivity.

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AKIP-1BCA3HIV-1M-PMVPKAcvirus incorporation

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Area of Science:

  • Virology
  • Molecular Biology
  • Cellular Biology

Background:

  • The function of breast carcinoma-associated protein 3 (BCA3), also known as A-kinase-interacting protein 1 (AKIP-1), remains incompletely defined.
  • Previous research indicated that BCA3 is incorporated into Mason-Pfizer monkey virus virions and promotes apoptosis induced by HIV-1 protease.

Purpose of the Study:

  • To investigate the association of BCA3 with human immunodeficiency virus type 1 (HIV-1) particles.
  • To determine the mechanism and requirements for BCA3 incorporation into HIV-1.
  • To assess the impact of BCA3 incorporation on HIV-1 infectivity.

Main Methods:

  • Immune-based detection methods.
  • Confocal microscopy.
  • Analysis of protein-protein interactions between BCA3 and protein kinase A (PKAc).

Main Results:

  • BCA3 is associated with purified and subtilisin-treated HIV-1 particles.
  • The C-terminus of BCA3 is necessary for its packaging into HIV-1 virions.
  • No specific HIV-1 binding domain for BCA3 was identified, and BCA3 incorporation did not alter HIV-1 infectivity.
  • BCA3's C-terminus binds to PKAc, a component found in HIV-1 particles.

Conclusions:

  • BCA3 incorporation into HIV-1 particles is likely mediated by its interaction with the cellular protein kinase A (PKAc).
  • The C-terminal domain of BCA3 plays a crucial role in this packaging process.
  • The functional consequence of BCA3 incorporation on HIV-1 replication remains undetermined.