scholarly journals Zeaxanthin Radical Cation Formation in Minor Light-harvesting Complexes of Higher Plant Antenna

2007 ◽  
Vol 283 (6) ◽  
pp. 3550-3558 ◽  
Author(s):  
Thomas J. Avenson ◽  
Tae Kyu Ahn ◽  
Donatas Zigmantas ◽  
Krishna K. Niyogi ◽  
Zhirong Li ◽  
...  
Keyword(s):  
Radical Cation ◽  
Light Harvesting ◽  
Higher Plant ◽  
Light Harvesting Complexes

scholarly journals The light-harvesting complexes of higher-plant Photosystem I: Lhca1/4 and Lhca2/3 form two red-emitting heterodimers

2011 ◽  
Vol 433 (3) ◽  
pp. 477-485 ◽  
Author(s):  
Emilie Wientjes ◽  
Roberta Croce
Keyword(s):  
Photosystem I ◽  
Light Harvesting ◽  
Fluorescence Emission ◽  
Light Response ◽  
Native State ◽  
Higher Plant ◽  
Light Harvesting Complexes ◽  
Light Harvesting Complex ◽  
Wavelength Emission

The outer antenna of higher-plant PSI (Photosystem I) is composed of four complexes [Lhc (light-harvesting complex) a1–Lhca4] belonging to the light-harvesting protein family. Difficulties in their purification have so far prevented the determination of their properties and most of the knowledge about Lhcas has been obtained from the study of the in vitro reconstituted antennas. In the present study we were able to purify the native complexes, showing that Lhca2/3 and Lhca1/4 form two functional heterodimers. Both dimers show red-fluorescence emission with maxima around 730 nm, as in the intact PSI complex. This indicates that the dimers are in their native state and that LHCI-680, which was previously assumed to be part of the PSI antenna, does not represent the native state of the system. The data show that the light-harvesting properties of the two dimers are functionally identical, concerning absorption, long-wavelength emission and fluorescence quantum yield, whereas they differ in their high-light response. Implications of the present study for the understanding of the energy transfer process in PSI are discussed. Finally, the comparison of the properties of the native dimers with those of the reconstituted complexes demonstrates that all of the major properties of the Lhcas are reproduced in the in vitro systems.

scholarly journals Properties of zeaxanthin and its radical cation bound to the minor light-harvesting complexes CP24, CP26 and CP29

2009 ◽  
Vol 1787 (6) ◽  
pp. 747-752 ◽  
Author(s):  
Sergiu Amarie ◽  
Laura Wilk ◽  
Tiago Barros ◽  
Werner Kühlbrandt ◽  
Andreas Dreuw ◽  
...  
Keyword(s):  
Radical Cation ◽  
Light Harvesting ◽  
Light Harvesting Complexes

scholarly journals Excitation-Energy Transfer Dynamics of Higher Plant Photosystem I Light-Harvesting Complexes

2011 ◽  
Vol 100 (5) ◽  
pp. 1372-1380 ◽  
Author(s):  
Emilie Wientjes ◽  
Ivo H.M. van Stokkum ◽  
Herbert van Amerongen ◽  
Roberta Croce
Keyword(s):  
Energy Transfer ◽  
Excitation Energy ◽  
Photosystem I ◽  
Light Harvesting ◽  
Excitation Energy Transfer ◽  
Higher Plant ◽  
Light Harvesting Complexes

scholarly journals Noise-Assisted Discord-Like Correlations in Light-Harvesting Photosynthetic Complexes

2021 ◽  
Vol 3 (2) ◽  
pp. 262-271
Author(s):  
Pablo Reséndiz-Vázquez ◽  
Ricardo Román-Ancheyta ◽  
Roberto León-Montiel
Keyword(s):  
Potential Role ◽  
Energy Transport ◽  
Light Harvesting ◽  
Quantum Correlations ◽  
Transport Processes ◽  
Quantum Evolution ◽  
Light Harvesting Complexes ◽  
Transport Efficiency ◽  
Photovoltaic Materials ◽  
Photosynthetic Complexes

Transport phenomena in photosynthetic systems have attracted a great deal of attention due to their potential role in devising novel photovoltaic materials. In particular, energy transport in light-harvesting complexes is considered quite efficient due to the balance between coherent quantum evolution and decoherence, a phenomenon coined Environment-Assisted Quantum Transport (ENAQT). Although this effect has been extensively studied, its behavior is typically described in terms of the decoherence’s strength, namely weak, moderate or strong. Here, we study the ENAQT in terms of quantum correlations that go beyond entanglement. Using a subsystem of the Fenna–Matthews–Olson complex, we find that discord-like correlations maximize when the subsystem’s transport efficiency increases, while the entanglement between sites vanishes. Our results suggest that quantum discord is a manifestation of the ENAQT and highlight the importance of beyond-entanglement correlations in photosynthetic energy transport processes.

scholarly journals Uncovering the interactions driving carotenoid binding in light-harvesting complexes

2021 ◽  
Author(s):  
Vincenzo Mascoli ◽  
Nicoletta Liguori ◽  
Lorenzo Cupellini ◽  
Eduard Elias ◽  
Benedetta Mennucci ◽  
...  
Keyword(s):  
Protein Stability ◽  
Light Harvesting ◽  
Light Harvesting Complexes

Carotenoids are essential constituents of plant light-harvesting complexes (LHCs), being involved in protein stability, light harvesting, and photoprotection. Unlike chlorophylls, whose binding to LHCs is known to require coordination of...

Sign in / Sign up

Export Citation Format

Share Document