Molecular Basis of Nonphotochemical Quenching; The Role of the Major Light Harvesting Complex II

2007 ◽  
pp. 501-503
Author(s):  
Sergiu Amarie ◽  
Tiago Barros ◽  
Jörg Standfuss ◽  
Andreas Dreuw ◽  
Werner Kühlbrandt ◽  
...  
Keyword(s):  
Molecular Basis ◽  
Light Harvesting ◽  
Nonphotochemical Quenching ◽  
Light Harvesting Complex ◽  
Complex Ii ◽  
Light Harvesting Complex Ii

The Role of the S1State of Carotenoids in Photosynthetic Energy Transfer:  The Light-Harvesting Complex II of Purple Bacteria

2001 ◽  
Vol 105 (44) ◽  
pp. 11016-11025 ◽  
Author(s):  
Chao-Ping Hsu ◽  
Peter J. Walla ◽  
Martin Head-Gordon ◽  
Graham R. Fleming
Keyword(s):  
Energy Transfer ◽  
Light Harvesting ◽  
Purple Bacteria ◽  
Light Harvesting Complex ◽  
Complex Ii ◽  
Light Harvesting Complex Ii

scholarly journals The Role of Acyl Lipids in Reconstitution of Lipid-Depleted Light-Harvesting Complex II from Cold-Hardened and Nonhardened Rye

1992 ◽  
Vol 100 (2) ◽  
pp. 931-938 ◽  
Author(s):  
Zbigniew Krupa ◽  
John P. Williams ◽  
Mobashoher U. Khan ◽  
Norman P. A. Huner
Keyword(s):  
Light Harvesting ◽  
Light Harvesting Complex ◽  
Complex Ii ◽  
Light Harvesting Complex Ii ◽  
Acyl Lipids

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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