Low-frequency vibronic mixing modulates the excitation energy flow in bacterial light-harvesting complex II

Kim, J., Nguyen-Phan, T. C., Gardiner, A. T., Cogdell, R. J. , Scholes, G. D. and Cho, M. (2021) Low-frequency vibronic mixing modulates the excitation energy flow in bacterial light-harvesting complex II. Journal of Physical Chemistry Letters, 12(27), pp. 6292-6298. (doi: 10.1021/acs.jpclett.1c01782) (PMID:34213343)

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Abstract

Oscillatory features observed in two-dimensional electronic spectroscopy (2DES) manifest coherent vibrational and electronic dynamics and even the interplay of them. Recently, we developed a 2DES technique utilizing a pair of synchronized repetition-frequency-stabilized lasers, which enables the wide dynamic range measurements of 2DES signals rapidly. Here, we apply this dual-laser 2DES technique to investigate the electronic energy transfer (EET) process in bacterial light-harvesting complex II consisting of B800 and B850 circular aggregates at ambient temperature, and the coherent vibrational wavepakcet associated with the EET between the two aggregates are measured. Examining the principal component analysis of the time-resolved 2DES signal, we found that the EET from B800 to low-lying B850 states is modulated by a low-frequency (156 cm–1) vibrational mode of the exciton donor (B800). This observation suggests that the donor transition density is modulated by this vibration, which, in turn, modulates the energy transfer dynamics.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Cogdell, Professor Richard and Gardiner, Dr Alastair and Nguyen Phan, Cam Tu
Authors: Kim, J., Nguyen-Phan, T. C., Gardiner, A. T., Cogdell, R. J., Scholes, G. D., and Cho, M.
College/School:College of Medical Veterinary and Life Sciences > Institute of Infection Immunity and Inflammation
College of Medical Veterinary and Life Sciences > Institute of Molecular Cell and Systems Biology
Journal Name:Journal of Physical Chemistry Letters
Publisher:American Chemical Society
ISSN:1948-7185
ISSN (Online):1948-7185
Published Online:02 July 2021

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
172826DNA-directed construction of three-dimensional photosynthetic assembliesAlasdair ClarkBiotechnology and Biological Sciences Research Council (BBSRC)BB/N016734/1ENG - Biomedical Engineering