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<p>Plant acclimation is a growing scientific concept, at molecular, cellular and global scales. All photosynthetic organisms that created an oxic atmosphere on earth possess a gene of unknown function “<i>Acclimation of Photosynthesis to the Environment 1</i>”. Here we show that <i>APE1</i> encodes a thylakoid-bound protein with a unique motif that binds copper and detoxifies the superoxide anion radical, O<sub>2</sub><sup>•−</sup>. Maturation of the recombinant APE1 protein from <i>Chlamydomonas reinhardtii</i> requires formation of cysteine disulfide bonds after copper binding or via a high affinity interaction with a copper chaperone (Plastid Copper Chaperone 1) that boosts its scavenging capacity for O<sub>2</sub><sup>•−</sup>. APE1 co-occurs in evolution with Photosystem II oxygen evolving proteins and it is the archaic O<sub>2</sub><sup>•−</sup> detoxifying enzyme for acclimating photosynthesis to an oxygenic environment.</p>

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Acclimation of Photosynthesis to the Environment 1 acts as a copper-binding superoxide detoxification enzyme

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年4月15日

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  • Soazig Malesinski,
  • André Vidal-Meireles,
  • Eve Giovannetti,
  • Marie Chazaux,
  • Anja Krieger-Liszkay,
  • Camille Boderiou,
  • Julie Latil,
  • Stefania Viola,
  • Leandro C. Tabares,
  • Pascal Arnoux,
  • Franck Chauvat,
  • Pathomchai Dindaeng,
  • Chloe Maurin,
  • Marina Siponen,
  • Stefano Caffarri,
  • Corinne Cassier-Chauvat,
  • Jean Alric,
  • Xenie Johnson

摘要

Plant acclimation is a growing scientific concept, at molecular, cellular and global scales. All photosynthetic organisms that created an oxic atmosphere on earth possess a gene of unknown function “Acclimation of Photosynthesis to the Environment 1”. Here we show that APE1 encodes a thylakoid-bound protein with a unique motif that binds copper and detoxifies the superoxide anion radical, O2•−. Maturation of the recombinant APE1 protein from Chlamydomonas reinhardtii requires formation of cysteine disulfide bonds after copper binding or via a high affinity interaction with a copper chaperone (Plastid Copper Chaperone 1) that boosts its scavenging capacity for O2•−. APE1 co-occurs in evolution with Photosystem II oxygen evolving proteins and it is the archaic O2•− detoxifying enzyme for acclimating photosynthesis to an oxygenic environment.