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SEL-5, a serine/threonine kinase that facilitates lin-12 activity in Caenorhabditis elegans

H Fares1, I Greenwald

  • 1Department of Biochemistry and Molecular Biophysics, Howard Hughes Medical Institute, Columbia University College of Physicians and Surgeons, New York, New York 10032, USA.

Genetics
|December 3, 1999
PubMed

Insights

The SEL-5 protein kinase regulates LIN-12/Notch receptor activity by influencing ligand-dependent cleavage. Its suppressive effects on LIN-12 mutations are tissue-specific, highlighting its complex role in cell fate decisions.

Area of Science:

  • Developmental Biology
  • Cell Signaling
  • Molecular Genetics

Background:

  • LIN-12/Notch receptors mediate cell-cell communication crucial for development.
  • Receptor activation involves ligand binding and proteolytic cleavage, releasing the intracellular domain.
  • Constitutive LIN-12 activity can lead to developmental defects.

Purpose of the Study:

  • To investigate the function of the SEL-5 gene in regulating LIN-12/Notch signaling.
  • To determine the molecular mechanism and tissue specificity of SEL-5's interaction with LIN-12.

Main Methods:

  • Genetic analysis of Caenorhabditis elegans mutants.
  • Characterization of lin-12 mutations and sel-5 suppressors.
  • Analysis of alternative splicing and protein domains of SEL-5.

Main Results:

  • SEL-5 mutations suppress specific gain-of-function lin-12 mutations affecting the extracellular domain.
  • SEL-5 does not suppress mutations affecting the intracellular domain, indicating a role before or during cleavage.
  • SEL-5 exhibits tissue-specific suppression of lin-12-mediated cell fate decisions.

Conclusions:

  • SEL-5 acts upstream of or during the ligand-dependent release of the LIN-12 intracellular domain.
  • SEL-5 encodes a serine/threonine kinase with potential roles in developmental signaling pathways.
  • The tissue-specific function of SEL-5 underscores the complexity of LIN-12/Notch pathway regulation.

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