H2020 Marie Curie Actions of the European Commission
955520
European Union
Biotechnology and Biological Sciences Research Council (BBSRC)
BB/R001383/1
英国
Biotechnology and Biological Sciences Research Council (BBSRC)
BB/V002015/1
英国
Biotechnology and Biological Sciences Research Council (BBSRC)
BB/R00921X
英国
Leverhulme Trust
RPG-2022-203
英国
Royal Society
Royal Society Research Professorship 2024
英国
引用
ジャーナル: Commun Biol / 年: 2025 タイトル: Structure of a stripped-down and tuned-up far-red phycobilisome. 著者: Giovanni Consoli / Ho Fong Leong / Geoffry A Davis / Tom Richardson / Aiysha McInnes / James W Murray / Andrea Fantuzzi / A William Rutherford / 要旨: A diverse subset of cyanobacteria can transiently modify their photosynthetic machinery during far-red light photoacclimation to drive photosynthesis with less energetic photons (700 nm-800 nm). ...A diverse subset of cyanobacteria can transiently modify their photosynthetic machinery during far-red light photoacclimation to drive photosynthesis with less energetic photons (700 nm-800 nm). To achieve this, all the main light-driven components of the photosynthetic apparatus, including their allophycocyanin antenna, are replaced with red-shifted paralogues. Recent studies based on the structure of an incomplete complex provided some insights into the tuning of the far-red phycobiliproteins. Here, we solved the structure of the intact bicylindrical allophycocyanin complex from the cyanobacterium Chroococcidiopsis thermalis PCC 7203 at a resolution of 2.51 Å determined by Cryo-electron microscopy single particle analysis. A comparison between conserved structural features in far-red and white light allophycocyanin cores provides insight on the evolutionary adaptations needed to optimize excitation energy transfer in the far-red light adapted photosynthetic apparatus. The reduction in antenna size in far-red photosynthesis suggests a need to optimize membrane packing to increase the number of photosystems and tune the ratio between chlorophyll f molecules and bilin pigments, while the wider spread in the absorption range of the bilins suggests faster and more efficient excitation energy transfer to far-red Photosystem II by limiting backflow of excitation from the reaction centres to the far-red bilin pigments.