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Linking chlorophyll biosynthesis to a dynamic plastoquinone pool.

Verdiana Steccanella1, Mats Hansson2, Poul Erik Jensen1

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Plant Physiology and Biochemistry : PPB
|October 20, 2015
PubMed
Summary

The cyclase step in chlorophyll biosynthesis is linked to the plastoquinone pool. Plastoquinol likely acts as the electron donor, connecting thylakoid redox status to chlorophyll production.

Keywords:
Chlorophyll biosynthesisCyclaseDi-iron enzymesPlastoquinolReductase

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Area of Science:

  • Biochemistry
  • Plant Biology
  • Photosynthesis Research

Background:

  • Chlorophylls are vital for photosynthesis, but the cyclase reaction forming the fifth ring remains uncharacterized.
  • The cyclase subunit AcsF contains a di-iron-binding motif, similar to plastid terminal oxidase (PTOX) and alternative oxidase (AOX).
  • Di-iron proteins require iron reduction (Fe3+ to Fe2+) for their catalytic cycle, necessitating a reductase or reductant.

Purpose of the Study:

  • To investigate the reductant involved in the chlorophyll cyclase reaction.
  • To determine if the cyclase step is coupled to the plastoquinone pool.
  • To establish a functional link between thylakoid redox status and chlorophyll biosynthesis.

Main Methods:

  • Utilized a specific inhibitor targeting di-iron proteins.
  • Employed Arabidopsis and barley mutants with altered photosynthetic electron flow regulation.
  • Analyzed the coupling of the cyclase step to the plastoquinone pool.

Main Results:

  • Demonstrated that the cyclase step is directly coupled to the plastoquinone pool.
  • Provided evidence that plastoquinol may serve as the electron donor for the cyclase reaction.
  • Identified plastoquinol as a potential cyclase reductase.

Conclusions:

  • Plastoquinol likely functions as the reductase for the chlorophyll cyclase reaction.
  • This finding establishes a direct connection between the thylakoid redox state and chlorophyll biosynthesis.
  • The study elucidates a key regulatory mechanism in the chlorophyll pathway.