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Related Experiment Videos

A structural basis for 14-3-3sigma functional specificity.

Erik W Wilker1, Robert A Grant, Stephen C Artim

  • 1Center for Cancer Research, Department of Biology and Division of Biological Engineering, Massachsuetts Institute of Technology, Cambridge, Massachusetts 02139, USA.

The Journal of Biological Chemistry
|February 26, 2005
PubMed
Summary
This summary is machine-generated.

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14-3-3sigma protein preferentially forms homodimers, distinguishing its unique cellular roles. Structural analysis reveals a second ligand-binding site responsible for 14-3-3sigma

Area of Science:

  • Molecular Biology
  • Structural Biology
  • Cellular Signaling

Background:

  • The 14-3-3 protein family has seven isotypes in mammals, crucial for intracellular signaling.
  • Most 14-3-3 proteins form homodimers or heterodimers with overlapping ligand-binding functions.
  • 14-3-3sigma, mainly in epithelial cells, has unique roles in DNA damage response and oncogenesis, but its structural basis is unclear.

Purpose of the Study:

  • To elucidate the structural and biological basis for 14-3-3sigma's unique functions.
  • To investigate the dimerization preferences of 14-3-3sigma.
  • To identify structural features responsible for 14-3-3sigma's specific ligand interactions.

Main Methods:

  • X-ray crystallography of 14-3-3sigma bound to a phosphopeptide ligand.

Related Experiment Videos

  • Site-directed mutagenesis of sigma-specific residues.
  • Analysis of protein-protein interactions and ligand binding.

    • Main Results:

    • Endogenous 14-3-3sigma preferentially forms homodimers.
    • The crystal structure reveals unique stabilizing interactions in 14-3-3sigma homodimers.
    • A second ligand-binding site in 14-3-3sigma, distinct from the phosphopeptide cleft, was identified and functionally confirmed via mutagenesis.
    • Mutating sigma-specific residues enabled 14-3-3sigma to bind Cdc25C, a ligand typically binding other 14-3-3s.

    Conclusions:

    • 14-3-3sigma's preferential homodimerization is structurally underpinned.
    • The phosphopeptide binding site is not solely responsible for 14-3-3sigma's unique functions.
    • A second ligand-binding site dictates 14-3-3sigma's specific ligand interactions, offering insights into its roles in DNA damage and oncogenesis.