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|Title:||Spectral tuning of light-harvesting complex II in the siphonous alga Bryopsis corticulans and its effect on energy transfer dynamics||Authors:||Akhtar, Parveen
Nowakowski, Paweł J.
Do, Thanh Nhut
Lambrev, Petar H.
|Keywords:||Science::Physics||Issue Date:||2020||Source:||Akhtar, P., Nowakowski, P. J., Wang, W., Do, T. N., Zhao, S., Siligardi, G., Garab, G., Shen, J., Tan, H. & Lambrev, P. H. (2020). Spectral tuning of light-harvesting complex II in the siphonous alga Bryopsis corticulans and its effect on energy transfer dynamics. Biochimica et Biophysica Acta - Bioenergetics, 1861(7), 148191-. https://dx.doi.org/10.1016/j.bbabio.2020.148191||Project:||MOE2015-T2-1-039||Journal:||Biochimica et Biophysica Acta - Bioenergetics||Abstract:||Light-harvesting complex II (LHCII) from the marine green macroalga Bryopsis corticulans is spectroscopically characterized to understand the structural and functional changes resulting from adaptation to intertidal environment. LHCII is homologous to its counterpart in land plants but has a different carotenoid and chlorophyll (Chl) composition. This is reflected in the steady-state absorption, fluorescence, linear dichroism, circular dichroism and anisotropic circular dichroism spectra. Time-resolved fluorescence and two-dimensional electronic spectroscopy were used to investigate the consequences of this adaptive change in the pigment composition on the excited-state dynamics. The complex contains additional Chl b spectral forms - absorbing at around 650 nm and 658 nm - and lacks the red-most Chl a forms compared with higher-plant LHCII. Similar to plant LHCII, energy transfer between Chls occurs on timescales from under hundred fs (mainly from Chl b to Chl a) to several picoseconds (mainly between Chl a pools). However, the presence of long-lived, weakly coupled Chl b and Chl a states leads to slower exciton equilibration in LHCII from B. corticulans. The finding demonstrates a trade-off between the enhanced absorption of blue-green light and the excitation migration time. However, the adaptive change does not result in a significant drop in the overall photochemical efficiency of Photosystem II. These results show that LHCII is a robust adaptable system whose spectral properties can be tuned to the environment for optimal light harvesting.||URI:||https://hdl.handle.net/10356/152152||ISSN:||0005-2728||DOI:||10.1016/j.bbabio.2020.148191||Rights:||© 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/BY/4.0/).||Fulltext Permission:||open||Fulltext Availability:||With Fulltext|
|Appears in Collections:||SPMS Journal Articles|
Updated on Nov 26, 2021
Updated on Nov 26, 2021
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