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In Vitro SUMOylation Assay to Study SUMO E3 Ligase Activity
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Phototropin Interactions with SUMO Proteins.

Justyna Łabuz1, Olga Sztatelman2,3, Dominika Jagiełło-Flasińska2

  • 1Laboratory of Photobiology, Malopolska Centre of Biotechnology, Jagiellonian University, Gronostajowa 7A, Kraków 30-387, Poland.

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|February 17, 2021
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Summary

Sumoylation pathway mutants in Arabidopsis thaliana show altered phototropism and chloroplast movements. The E3 ligase siz1 mutant enhances chloroplast accumulation, revealing phot2

Keywords:
ArabidopsisBlue lightChloroplast movementsPhototropinPhototropismSumoylation

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Area of Science:

  • Plant molecular biology
  • Photoreceptor signaling
  • Posttranslational modifications

Background:

  • Phototropins (phots) are crucial plant UVA/blue light photoreceptors regulating growth and photosynthesis optimization.
  • Sumoylation, a posttranslational modification, impacts protein stability, activity, interactions, and localization.
  • The interplay between sumoylation and phototropin function in plants remains largely unexplored.

Purpose of the Study:

  • To investigate the physiological effects of sumoylation pathway disruption on phototropin-controlled responses in Arabidopsis thaliana.
  • To elucidate the molecular mechanisms underlying the interaction and modification of phototropins by SUMO proteins.

Main Methods:

  • Analysis of phototropism and chloroplast movement in sumoylation pathway mutants.
  • Biochemical assays including yeast two-hybrid and plant transient expression to study protein interactions.
  • In vitro sumoylation assays and mass spectrometry to identify sumoylation sites.
  • Western blot analysis to assess protein abundance under different light conditions.

Main Results:

  • The E3 ligase siz1 mutant exhibited enhanced chloroplast accumulation, dependent on phot2, under continuous and pulsed light.
  • A notable decrease in phot2 protein levels was observed in the siz1 mutant following blue light exposure.
  • Phototropins were found to interact with SUMO proteins via their N-terminal LOV domains.
  • Lysine 297 was identified as the primary site of SUMO3 modification on phot2.
  • Sumoylation of phot2 was confirmed in Arabidopsis leaves under light and heat stress.

Conclusions:

  • Sumoylation significantly influences phototropin-mediated physiological processes, including chloroplast movement.
  • The siz1 mutation impacts phot2 protein stability and function, affecting light-induced responses.
  • Phototropins are direct targets of sumoylation, with specific sites identified.
  • Sumoylation of phot2 is a dynamic process regulated by environmental stress conditions.