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The proapoptotic protein Bad binds the amphipathic groove of 14-3-3zeta

H Yang1, S C Masters, H Wang

  • 1Graduate Program in Biochemistry, Cell and Developmental Biology, Emory University School of Medicine, Atlanta, GA 30322, USA.

Biochimica Et Biophysica Acta
|June 19, 2001
PubMed

Insights

14-3-3 proteins bind to the proapoptotic protein Bad via a conserved amphipathic groove. Specific residues in this groove are critical for binding and for 14-3-3’s ability to inhibit Bad-induced cell death.

Area of Science:

  • Cellular Biology
  • Molecular Biology
  • Biochemistry

Background:

  • 14-3-3 proteins are crucial regulators of cellular processes, including apoptosis.
  • They interact with numerous target proteins, such as the proapoptotic protein Bad.
  • Understanding these interactions is key to modulating cell death pathways.

Purpose of the Study:

  • To identify the structural elements of 14-3-3 proteins involved in binding to Bad.
  • To investigate how this interaction affects Bad's proapoptotic function.
  • To explore the implications of a shared binding site for 14-3-3 ligands.

Main Methods:

  • Used competitor peptides to map the 14-3-3 binding site for Bad.
  • Mutagenesis of conserved residues within the 14-3-3 amphipathic groove.
  • Co-expression studies with Bad and Akt to assess cell death inhibition.

Main Results:

  • Bad interacts with 14-3-3zeta through its conserved amphipathic groove.
  • Specific residues (Lys-49, Val-176, Leu-220) are critical for this interaction.
  • 14-3-3’s ability to inhibit Bad-induced apoptosis requires intact binding to Bad.

Conclusions:

  • The amphipathic groove of 14-3-3 proteins is essential for binding Bad.
  • This interaction is critical for 14-3-3 to counteract Bad-mediated cell death.
  • The conserved binding site suggests potential ligand competition for 14-3-3, impacting cellular regulation.

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