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Area of Science:

  • Plant biochemistry
  • Molecular biology
  • Environmental science

Background:

  • Anthropogenic 1,3,5-triazines are stable chemical scaffolds used in herbicides.
  • Ascorbate peroxidases (APXs) are crucial enzymes in plant antioxidant defense systems.

Purpose of the Study:

  • To investigate the selective targeting of APX enzymes by small 1,3,5-triazines.
  • To develop a chemical probe for studying APX activity across plant species.
  • To elucidate the role of APX enzymes in protecting photosystems.

Main Methods:

  • Synthesis and application of an alkyne-tagged 1,3,5-triazine probe (KSC-3).
  • Selective binding assays of KSC-3 with APX enzymes in plant extracts and living cells.
  • Assessment of photosynthetic activity under light stress in wild-type and mutant plants.
  • Profiling of APX1 with KSC-3 to identify interactions with herbicide metabolites.

Main Results:

  • Small 1,3,5-triazines, including KSC-3, selectively target APX enzymes in diverse plant species (Arabidopsis, tomato, rice, maize, liverwort).
  • KSC-3 effectively binds APX enzymes and inhibits their activity, reducing photosynthetic efficiency under light stress.
  • The findings indicate that APX enzymes beyond APX1 contribute to photosystem protection against reactive oxygen species.
  • Catabolic products of atrazine, a common herbicide, were identified as APX1 targets.

Conclusions:

  • The chemical probe KSC-3 is a valuable tool for studying APX enzymes across the plant kingdom.
  • APX enzymes play a significant role in plant photoprotection, highlighting their importance in stress response.
  • Environmental pollutants like atrazine metabolites can interfere with essential plant biochemical pathways.