Inter-subunit Energy Transfer Processes in a Minimal Plant Photosystem II Supercomplex

Overview

Journal Sci Adv

Specialties Biology
Science

Date 2024 Feb 23

PMID 38394196

Authors

Hoang Long Nguyen

Thanh Nhut Do

Kai Zhong

Parveen Akhtar

Thomas L C Jansen

Jasper Knoester

Stefano Caffarri

Petar Lambrev

Howe-Siang Tan

Affiliations

Soon will be listed here.

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.

Citing Articles

Coarse-Grained Approach to Simulate Signatures of Excitation Energy Transfer in Two-Dimensional Electronic Spectroscopy of Large Molecular Systems.

Zhong K, Nguyen H, Do T, Tan H, Knoester J, Jansen T J Chem Theory Comput. 2024; 20(14):6111-6124.

PMID: 38996082 PMC: 11270824. DOI: 10.1021/acs.jctc.4c00413.

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