@article{81ef95b9eb6c403d8eec6ca4d169e653,
title = "Helical allophycocyanin nanotubes absorb far-red light in a thermophilic cyanobacterium",
abstract = "To compete in certain low-light environments, some cyanobacteria express a paralog of the light-harvesting phycobiliprotein, allophycocyanin (AP), that strongly absorbs far-red light (FRL). Using cryo-electron microscopy and time-resolved absorption spectroscopy, we reveal the structure-function relationship of this FRL-absorbing AP complex (FRL-AP) that is expressed during acclimation to low light and that likely associates with chlorophyll a-containing photosystem I. FRL-AP assembles as helical nanotubes rather than typical toroids due to alterations of the domain geometry within each subunit. Spectroscopic characterization suggests that FRL-AP nanotubes are somewhat inefficient antenna; however, the enhanced ability to harvest FRL when visible light is severely attenuated represents a beneficial trade-off. The results expand the known diversity of lightharvesting proteins in nature and exemplify how biological plasticity is achieved by balancing resource accessibility with efficiency.",
author = "Gisriel, {Christopher J.} and Eduard Elias and Gaozhong Shen and Soulier, {Nathan T.} and Flesher, {David A.} and Gunner, {M. R.} and Brudvig, {Gary W.} and Roberta Croce and Bryant, {Donald Ashley}",
note = "Funding Information: This work was supported by NSF grant MCB-1613022 (to D.A.B.); Department of Energy, Office of Basic Energy Sciences, Division of Chemical Sciences grant DEFG02-05ER15646 (to G.W.B.); Department of Energy, Office of Basic Energy Sciences, Division of Chemical Sciences grant DE-SC0001423 (to M.R.G.); National Institutes of General Medical Sciences of the NIH under award number K99GM140174 (to C.J.G.); Netherlands Organization for Scientific Research (NWO) via a Top grant (to R.C.); and National Institutes of General Medical Sciences of the NIH Predoctoral Program in Biophysics award number T32GM008283 (to D.A.F.). The content is solely the responsibility of the authors and does not necessarily represent the official views of the NIH. Publisher Copyright: Copyright {\textcopyright} 2023 The Authors.",
year = "2023",
month = mar,
doi = "10.1126/sciadv.adg0251",
language = "English (US)",
volume = "9",
journal = "Science Advances",
issn = "2375-2548",
publisher = "American Association for the Advancement of Science",
number = "12",
}