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TitleThe structural basis for light acclimation in phycobilisome light harvesting systems systems in Porphyridium purpureum.
Journal, issue, pagesCommun Biol, Vol. 6, Issue 1, Page 1210, Year 2023
Publish dateNov 27, 2023
AuthorsEmma Joy Dodson / Jianfei Ma / Maayan Suissa Szlejf / Naama Maroudas-Sklare / Yossi Paltiel / Noam Adir / Shan Sun / Sen-Fang Sui / Nir Keren /
PubMed AbstractPhotosynthetic organisms adapt to changing light conditions by manipulating their light harvesting complexes. Biophysical, biochemical, physiological and genetic aspects of these processes are ...Photosynthetic organisms adapt to changing light conditions by manipulating their light harvesting complexes. Biophysical, biochemical, physiological and genetic aspects of these processes are studied extensively. The structural basis for these studies is lacking. In this study we address this gap in knowledge by focusing on phycobilisomes (PBS), which are large structures found in cyanobacteria and red algae. In this study we focus on the phycobilisomes (PBS), which are large structures found in cyanobacteria and red algae. Specifically, we examine red algae (Porphyridium purpureum) grown under a low light intensity (LL) and a medium light intensity (ML). Using cryo-electron microscopy, we resolve the structure of ML-PBS and compare it to the LL-PBS structure. The ML-PBS is 13.6 MDa, while the LL-PBS is larger (14.7 MDa). The LL-PBS structure have a higher number of closely coupled chromophore pairs, potentially the source of the red shifted fluorescence emission from LL-PBS. Interestingly, these differences do not significantly affect fluorescence kinetics parameters. This indicates that PBS systems can maintain similar fluorescence quantum yields despite an increase in LL-PBS chromophore numbers. These findings provide a structural basis to the processes by which photosynthetic organisms adapt to changing light conditions.
External linksCommun Biol / PubMed:38012412 / PubMed Central
MethodsEM (single particle)
Resolution3.6 Å
Structure data

EMDB-34534: Un-sharpened map of phycobilisome from Porphyridium purpureum under Middle light
Method: EM (single particle) / Resolution: 3.6 Å

Source
  • Porphyridium purpureum (eukaryote)

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