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© Jean Marc Panaud
Cyanobactérie souche "PCC 9401". Souche de la "Pasteur Culture Collection of Cyanobacteria" conservée à l'état axénique dans l'Unité des Cyanobactéries. La PCC est l'une des Collections spécialisées de l'Institut Pasteur.
Publication : Nature plants

Physiological and evolutionary implications of tetrameric photosystem I in cyanobacteria

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Nature plants - 09 Dec 2019

Li M, Calteau A, Semchonok DA, Witt TA, Nguyen JT, Sassoon N, Boekema EJ, Whitelegge J, Gugger M, Bruce BD

Link to Pubmed [PMID] – 31819227

Nat Plants 2019 Dec;5(12):1309-1319

Photosystem I (PSI) is present as trimeric complexes in most characterized cyanobacteria and as monomers in plants and algae. Recent reports of tetrameric PSI have raised questions regarding its structural basis, physiological role, phylogenetic distribution and evolutionary significance. Here, we examined PSI in 61 cyanobacteria, showing that tetrameric PSI, which correlates with the psaL gene and a distinct genomic structure, is widespread among heterocyst-forming cyanobacteria and their close relatives. Physiological studies revealed that expression of tetrameric PSI is favoured under high light, with an increased content of novel PSI-bound carotenoids (myxoxanthophyll, canthaxanthan and echinenone). In sum, this work suggests that tetrameric PSI is an adaptation to high light intensity, and that change in PsaL leads to monomerization of trimeric PSI, supporting the hypothesis of tetrameric PSI being the evolutionary intermediate in the transition from cyanobacterial trimeric PSI to monomeric PSI in plants and algae.

https://www.ncbi.nlm.nih.gov/pubmed/31819227