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Ceramides modulate programmed cell death in plants.

Hua Liang1, Nan Yao, Jong Tae Song

  • 1Department of Molecular Genetics and Cell Biology, The University of Chicago, Chicago, Illinois 60637, USA. jgreenbe@midway.uchicago.edu

Genes & Development
|October 18, 2003
PubMed
Summary
This summary is machine-generated.

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Plant programmed cell death (PCD) is modulated by ceramide balance. A novel ceramide kinase (CERK) mutant in Arabidopsis, accelerated cell death 5 (ACD5), reveals ceramide phosphorylation

Area of Science:

  • Plant biology
  • Cellular signaling
  • Biochemistry

Background:

  • The balance between ceramide and its phosphorylated forms regulates programmed cell death (PCD) in eukaryotes.
  • Ceramide kinase (CERK) is a key enzyme in ceramide metabolism.

Purpose of the Study:

  • To characterize the first ceramide kinase (CERK) mutant in any organism.
  • To investigate the role of ceramide phosphorylation in plant PCD.

Main Methods:

  • Characterization of the Arabidopsis CERK mutant, accelerated cell death 5 (ACD5).
  • In vitro enzymatic assays to determine substrate specificity of ACD5 protein.
  • Analysis of disease symptoms and cell death phenotypes in the ACD5 mutant.

Main Results:

Related Experiment Videos

  • The ACD5 mutant accumulates CERK substrates.
  • ACD5 mutant exhibits enhanced disease symptoms during pathogen attack.
  • ACD5 mutant displays apoptotic-like cell death dependent on late-stage defense signaling.
  • ACD5 protein demonstrates high specificity for ceramides in vitro.
  • C2 ceramide induces plant PCD, while its phosphorylated derivative partially inhibits it.

Conclusions:

  • Ceramide phosphorylation plays a crucial role in modulating plant PCD.
  • The ACD5 mutant provides a valuable tool for studying ceramide signaling in plants.
  • Findings support a model where the balance of ceramide and its phosphorylated forms dictates cell death outcomes in plants.