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A chlorophyll c synthase widely co-opted by phytoplankton
Jiang, Y.; Cao, T.; Yang, Y.; Zhang, H.; Zhang, J.; Li, X. (2023). A chlorophyll c synthase widely co-opted by phytoplankton. Science (Wash.) 382(6666): 92-98. https://dx.doi.org/10.1126/science.adg7921
In: Science (Washington). American Association for the Advancement of Science: New York, N.Y. ISSN 0036-8075; e-ISSN 1095-9203, meer
Peer reviewed article  
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  • Jiang, Y.
  • Cao, T.
  • Yang, Y.
  • Zhang, H.
  • Zhang, J.
  • Li, X.
Abstract
    Marine and terrestrial photosynthesis exhibit a schism in the accessory chlorophyll (Chl) that complements the function of Chl a: Chl b for green plants versus Chl c for most eukaryotic phytoplankton. The enzymes that mediate Chl c biosynthesis have long remained elusive. In this work, we identified the CHLC dioxygenase (Phatr3_J43737) from the marine diatom Phaeodactylum tricornutum as the Chl c synthase. The chlc mutants lacked Chl c, instead accumulating its precursors, and exhibited growth defects. In vitro, recombinant CHLC protein converted these precursors into Chl c, thereby confirming its identity. Phylogenetic evidence demonstrates conserved use of CHLC across phyla but also the existence of distinct Chl c synthases in different algal groups. Our study addresses a long-outstanding question with implications for both contemporary and ancient marine photosynthesis.
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