scholarly journals Studying Spatio-Energetic Dynamics in Light Harvesting Complex II using Two-Dimensional Electronic-Vibrational Spectroscopy

2016 ◽  
Author(s):  
Nicholas H. C. Lewis ◽  
Thomas A. A. Oliver ◽  
Matteo Ballottari ◽  
Natalie L. Gruenke ◽  
Roberto Bassi ◽  
...  
Keyword(s):  
Vibrational Spectroscopy ◽  
Light Harvesting ◽  
Two Dimensional ◽  
Light Harvesting Complex ◽  
Complex Ii ◽  
Light Harvesting Complex Ii

scholarly journals Two-Dimensional Electronic Spectroscopy of Light-Harvesting Complex II at Ambient Temperature: A Joint Experimental and Theoretical Study

2015 ◽  
Vol 119 (36) ◽  
pp. 12017-12027 ◽  
Author(s):  
Hong-Guang Duan ◽  
Amy L. Stevens ◽  
Peter Nalbach ◽  
Michael Thorwart ◽  
Valentyn I. Prokhorenko ◽  
...  
Keyword(s):  
Ambient Temperature ◽  
Theoretical Study ◽  
Light Harvesting ◽  
Electronic Spectroscopy ◽  
Two Dimensional ◽  
Light Harvesting Complex ◽  
Complex Ii ◽  
Light Harvesting Complex Ii

scholarly journals The role of mixed vibronic Qy-Qx bands in the light-harvesting dynamics of the major antenna complex, LHCII

2020 ◽  
Author(s):  
Eric Arsenault ◽  
Yusuke Yoneda ◽  
Masakazu Iwai ◽  
Krishna Niyogi ◽  
Graham Fleming
Keyword(s):  
Vibrational Spectroscopy ◽  
Light Harvesting ◽  
Red Light ◽  
Green Light ◽  
Two Dimensional ◽  
Light Harvesting Complex ◽  
Antenna Complex ◽  
Light Harvesting Complex Ii ◽  
Natural Photosynthesis

Abstract The importance of green light for driving natural photosynthesis has long been underappreciated, however, under the presence of strong illumination, green light actually drives photosynthesis more efficiently than red light. This green light is absorbed by mixed vibronic Qy-Qx states, arising from chlorophyll (Chl)-Chl interactions, although almost nothing is known about these states. Here, we employ polarization-dependent two-dimensional electronic-vibrational spectroscopy to study the origin and dynamics of the mixed vibronic Qy-Qx states of light-harvesting complex II. We show the states in this region dominantly arise from Chl b and demonstrate how it is possible to distinguish between the degree of vibronic Qy versus Qx character. We find that the dynamics for states of predominately Chl b Qy versus Chl b Qx character are markedly different, as excitation persists for significantly longer in the Qx states and there is an oscillatory component to the Qx dynamics, which will be discussed. Our findings demonstrate the central role of electronic-nuclear mixing in efficient light-harvesting and the different functionalities of Chl a and Chl b.

scholarly journals Two-Dimensional Spectroscopy of Chlorophyll a Excited-State Equilibration in Light-Harvesting Complex II

2016 ◽  
Vol 8 (1) ◽  
pp. 257-263 ◽  
Author(s):  
Parveen Akhtar ◽  
Cheng Zhang ◽  
Thanh Nhut Do ◽  
Győző Garab ◽  
Petar H. Lambrev ◽  
...  
Keyword(s):  
Excited State ◽  
Chlorophyll A ◽  
Light Harvesting ◽  
Two Dimensional ◽  
Light Harvesting Complex ◽  
Complex Ii ◽  
Light Harvesting Complex Ii

scholarly journals The role of mixed vibronic Qy-Qx states in green light absorption of light-harvesting complex II

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Eric A. Arsenault ◽  
Yusuke Yoneda ◽  
Masakazu Iwai ◽  
Krishna K. Niyogi ◽  
Graham R. Fleming
Keyword(s):  
Light Harvesting ◽  
Red Light ◽  
Green Light ◽  
Two Dimensional ◽  
Light Harvesting Complex ◽  
Complex Ii ◽  
Absorption Of Light ◽  
Light Harvesting Complex Ii ◽  
Natural Photosynthesis

AbstractThe importance of green light for driving natural photosynthesis has long been underappreciated, however, under the presence of strong illumination, green light actually drives photosynthesis more efficiently than red light. This green light is absorbed by mixed vibronic Qy-Qx states, arising from chlorophyll (Chl)-Chl interactions, although almost nothing is known about these states. Here, we employ polarization-dependent two-dimensional electronic-vibrational spectroscopy to study the origin and dynamics of the mixed vibronic Qy-Qx states of light-harvesting complex II. We show the states in this region dominantly arise from Chl b and demonstrate how it is possible to distinguish between the degree of vibronic Qy versus Qx character. We find that the dynamics for states of predominately Chl b Qy versus Chl b Qx character are markedly different, as excitation persists for significantly longer in the Qx states and there is an oscillatory component to the Qx dynamics, which is discussed. Our findings demonstrate the central role of electronic-nuclear mixing in efficient light-harvesting and the different functionalities of Chl a and Chl b.

Macroorganisation and flexibility of thylakoid membranes

2019 ◽  
Vol 476 (20) ◽  
pp. 2981-3018 ◽  
Author(s):  
Petar H. Lambrev ◽  
Parveen Akhtar
Keyword(s):  
Light Harvesting ◽  
Current Knowledge ◽  
Three Dimensional ◽  
Photosynthetic Apparatus ◽  
Dynamic Responses ◽  
State Transitions ◽  
Photochemical Quenching ◽  
Light Harvesting Complex ◽  
Complex Ii ◽  
Light Harvesting Complex Ii

Abstract The light reactions of photosynthesis are hosted and regulated by the chloroplast thylakoid membrane (TM) — the central structural component of the photosynthetic apparatus of plants and algae. The two-dimensional and three-dimensional arrangement of the lipid–protein assemblies, aka macroorganisation, and its dynamic responses to the fluctuating physiological environment, aka flexibility, are the subject of this review. An emphasis is given on the information obtainable by spectroscopic approaches, especially circular dichroism (CD). We briefly summarise the current knowledge of the composition and three-dimensional architecture of the granal TMs in plants and the supramolecular organisation of Photosystem II and light-harvesting complex II therein. We next acquaint the non-specialist reader with the fundamentals of CD spectroscopy, recent advances such as anisotropic CD, and applications for studying the structure and macroorganisation of photosynthetic complexes and membranes. Special attention is given to the structural and functional flexibility of light-harvesting complex II in vitro as revealed by CD and fluorescence spectroscopy. We give an account of the dynamic changes in membrane macroorganisation associated with the light-adaptation of the photosynthetic apparatus and the regulation of the excitation energy flow by state transitions and non-photochemical quenching.

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