An additional role for chloroplast proteins-an amino acid reservoir for energy production during sugar starvation

Masanori Izumi, Hiroyuki Ishida

Research output: Contribution to journalArticlepeer-review

Abstract

Autophagy is an evolutionarily conserved system that degrades intracellular components including proteins and organelles, and is important in the adaptive response to starvation in various eukaryotic organisms. Plant chloroplasts convert light energy into chemical energy and assimilate atmospheric carbon dioxide (CO2) for carbohydrate production through photosynthesis reactions. We previously described an autophagy process for chloroplast degradation, during which a portion of chloroplasts are mobilized into the vacuole via autophagic vesicles termed Rubisco-containing bodies. Our recent study demonstrated that the activation of autophagy in photoassimilate-limited leaves is required for the production of free amino acids (AAs) as an alternative energy source. The catabolism of free branched-chain amino acids (BCAAs) is particularly important for survival under starvation conditions. These recent findings suggest an additional role for chloroplasts as a reservoir of AA when photosynthetic energy production is limited.

Original languageEnglish
Pages (from-to)1552057
Number of pages1
JournalPlant signaling & behavior
Volume14
Issue number1
DOIs
Publication statusPublished - 2019

Keywords

  • Amino acid catabolism
  • arabidopsis
  • autophagy
  • branched-chain amino acids
  • chloroplasts
  • energy production
  • rubisco-containing body
  • sugar starvation

ASJC Scopus subject areas

  • Plant Science

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