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Related Experiment Videos

Auxin is surfacing.

Steffen Abel1

  • 1Department of Plant Sciences, University of California-Davis, Davis, California 95616, USA. sabel@ucdavis.edu

ACS Chemical Biology
|June 21, 2007
PubMed
Summary
This summary is machine-generated.

The plant hormone indole-3-acetic acid (auxin) regulates gene expression by enabling the destruction of Aux/IAA proteins. This study reveals how auxin binding extends the receptor

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Area of Science:

  • Plant biology
  • Molecular biology
  • Biochemistry

Background:

  • Indole-3-acetic acid (IAA), a crucial plant hormone, regulates vital cellular processes including gene expression.
  • IAA is perceived by a ubiquitin protein ligase (E3) that targets Aux/IAA proteins for degradation.

Purpose of the Study:

  • To elucidate the structural mechanism by which auxin promotes the recruitment of Aux/IAA substrates to the E3 ligase.
  • To establish a novel mechanism for E3 ligase regulation by small molecules.

Main Methods:

  • X-ray crystallography to determine the structural model of the plant hormone receptor complex.
  • Biochemical assays to analyze protein-protein interactions and substrate recruitment.

Main Results:

Related Experiment Videos

  • The first structural model of a plant hormone receptor complex reveals that auxin binding extends the hydrophobic protein-interaction surface.
  • This extension facilitates the recruitment of Aux/IAA proteins to the E3 ligase for ubiquitination and degradation.

Conclusions:

  • A novel mechanism for small molecule regulation of E3 ligase activity is established.
  • This research offers potential new strategies for treating human diseases linked to faulty ubiquitin-dependent proteolysis.