@article{af4d6d0cc3814e6283d9d7c89872a4da,
title = "The structure of Photosystem I acclimated to far-red light illuminates an ecologically important acclimation process in photosynthesis",
abstract = "Phototrophic organisms are superbly adapted to different light environments but often must acclimate to challenging competition for visible light wavelengths in their niches. Some cyanobacteria overcome this challenge by expressing paralogous photosynthetic proteins and by synthesizing and incorporating ~8% chlorophyll f into their Photosystem I (PSI) complexes, enabling them to grow under far-red light (FRL). We solved the structure of FRL-acclimated PSI from the cyanobacterium Fischerella thermalis PCC 7521 by single-particle, cryo–electron microscopy to understand its structural and functional differences. Four binding sites occupied by chlorophyll f are proposed. Subtle structural changes enable FRL-adapted PSI to extend light utilization for oxygenic photosynthesis to nearly 800 nm. This structure provides a platform for understanding FRL-driven photosynthesis and illustrates the robustness of adaptive and acclimation mechanisms in nature.",
author = "Christopher Gisriel and Gaozhong Shen and Vasily Kurashov and Ho, {Ming Yang} and Shangji Zhang and Dewight Williams and Golbeck, {John H.} and Petra Fromme and Bryant, {Donald A.}",
note = "Funding Information: We thank B. Nannenga and A. Singharoy for use of computing resources, P.-L. Chu and Z. Dobson for assistance in data processing guidance, and H. Toporik for advice in sample preparation at the Biodesign Center for Applied Structural Discovery at Arizona State University. We acknowledge the use of facilities within the Eyring Materials Center at Arizona State University (NSF grant 1531991). For Fig. 1 (B and C), Fig. 3B, and fig. S2B, graphics were designed with the UCSF Chimera, developed by the Resource for Biocomputing, Visualization, and Informatics at the UCSF, with support from NIH P41-GM103311. Funding: This work was supported by the Biodesign Center for Applied Structural Discovery at Arizona State University and by NSF grant MCB-1613022 to D.A.B and J.H.G. Some of this research was also conducted under the auspices of the Photosynthetic Antenna Research Center (PARC), an Energy Frontier Research Center funded by the DOE, Office of Science, Office of Basic Energy Publisher Copyright: Copyright {\textcopyright} 2020 The Authors,",
year = "2020",
month = feb,
day = "5",
doi = "10.1126/sciadv.aay6415",
language = "English (US)",
volume = "6",
journal = "Science Advances",
issn = "2375-2548",
publisher = "American Association for the Advancement of Science",
number = "6",
}