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Two E3 ligases antagonistically regulate the UV-B response in Arabidopsis.

Hui Ren1, Jiupan Han1, Panyu Yang2

  • 1State Key Laboratory of Cellular Stress Biology, School of Life Sciences, Xiamen University, 361102 Xiamen, China.

Proceedings of the National Academy of Sciences of the United States of America
|February 22, 2019
PubMed
Summary

Plants use photomorphogenesis to adapt to light. This study reveals how UV-B light triggers E3 ligase complexes to control seedling development by regulating the HY5 transcription factor.

Keywords:
E3 ligaseUV-Blight signaling

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Area of Science:

  • Plant Biology
  • Molecular Biology
  • Developmental Biology

Background:

  • Photomorphogenesis is crucial for plant development, especially during seedling emergence.
  • Plants adapt to environmental light, including UV-B radiation, through complex signaling pathways.
  • The molecular mechanisms governing UV-B signaling in photomorphogenesis are not fully understood.

Purpose of the Study:

  • To elucidate the molecular mechanisms of UV-B signaling in Arabidopsis thaliana photomorphogenesis.
  • To identify the key E3 ligase complexes and transcription factors involved in UV-B response pathways.
  • To understand how plants balance UV-B signaling for adaptive development.

Main Methods:

  • Biochemical assays to study protein interactions and degradation.
  • Genetic analysis in Arabidopsis thaliana to validate molecular pathways.
  • Investigating the roles of E3 ligases (CUL4-DDB1 and COP1) and transcription factor HY5.

Main Results:

  • UV-B-inducible proteins RUP1/RUP2 form a CUL4-DDB1-based E3 ligase that degrades HY5, repressing photomorphogenesis.
  • COP1 targets RUP1/RUP2 for degradation, which in turn stabilizes HY5 protein.
  • Two E3-substrate modules (CUL4-DDB1-RUP1/RUP2-HY5 and COP1-RUP1/RUP2) mediate UV-B responses.

Conclusions:

  • The study reveals a dual E3 ligase system controlling HY5 stability in response to prolonged UV-B.
  • This repression and derepression machinery allows plants to fine-tune photomorphogenic development under UV-B stress.
  • Understanding these signaling circuits is key to comprehending plant adaptation to environmental light changes.