Inter-subunit energy transfer processes in a minimal plant photosystem II supercomplex

Nguyen, Hoang Long and Do, Thanh Nhut and Zhong, Kai and Akhtar, Parveen and Jansen, Thomas L. C. and Knoester, Jasper and Caffarri, Stefano and Lambrev, Petar and Tan, Howe-Siang (2024) Inter-subunit energy transfer processes in a minimal plant photosystem II supercomplex. SCIENCE ADVANCES, 10 (8). ISSN 2375-2548

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Abstract

Photosystem II (PSII) is an integral part of the photosynthesis machinery, in which several light-harvesting complexes rely on inter-complex excitonic energy transfer (EET) processes to channel energy to the reaction center. In this paper, we report on a direct observation of the inter-complex EET in a minimal PSII supercomplex from plants, containing the trimeric light-harvesting complex II (LHCII), the monomeric light-harvesting complex CP26, and the monomeric PSII core complex. Using two-dimensional (2D) electronic spectroscopy, we measure an inter-complex EET timescale of 50 picoseconds for excitations from the LHCII-CP26 peripheral antenna to the PSII core. The 2D electronic spectra also reveal that the transfer timescale is nearly constant over the pump spectrum of 600 to 700 nanometers. Structure-based calculations reveal the contribution of each antenna complex to the measured inter-complex EET time. These results provide a step in elucidating the full inter-complex energy transfer network of the PSII machinery.

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