Construction of Photosynthetic Antenna Complex Using Light-harvesting Polypeptide-α from Photosynthetic Bacteria,R. rubrumwith Zinc Substituted Bacteriochlorophylla

2003 ◽  
Vol 32 (3) ◽  
pp. 216-217 ◽  
Author(s):  
Morio Nagata ◽  
Mamoru Nango ◽  
Ayumi Kashiwada ◽  
Shuhei Yamada ◽  
Seiji Ito ◽  
...  
Keyword(s):  
Photosynthetic Bacteria ◽  
Light Harvesting ◽  
Antenna Complex ◽  
Photosynthetic Antenna

scholarly journals 2D1645 The effect of the hydrophilic segment of light-harvesting polypeptides on formation of photosynthetic antenna complex in lipid

2002 ◽  
Vol 42 (supplement2) ◽  
pp. S110
Author(s):  
N. Kajiwara ◽  
J. Inagaki ◽  
Y. Yoshimura ◽  
M. Nagata ◽  
K. Iida ◽  
...  
Keyword(s):  
Light Harvesting ◽  
Antenna Complex ◽  
Photosynthetic Antenna

A Photosynthetic Antenna System which Contains a Protein-Free Chromophore Aggregate

1990 ◽  
Vol 45 (3-4) ◽  
pp. 203-206 ◽  
Author(s):  
Alfred R. Holzwarth ◽  
Kai Gnebenow ◽  
Kai Gnebenow ◽  
Kurt Schaffner
Keyword(s):  
Light Harvesting ◽  
Protein Complexes ◽  
Fixed Ratio ◽  
Antenna System ◽  
Interior Architecture ◽  
First Case ◽  
Organizational Principle ◽  
Photosynthetic Antenna

Abstract The interior of chlorosomes, the main antenna system of the photosynthesizing bacterium Chloroßexus aurantiacus, is shown to contain no proteins in a fixed ratio to BChl c and in amounts that could be significant of direct chromophore-protein complexes. This excludes non-covalent chromophore-protein complexing -that has so far been found in all other antennae -as the main organizational principle of the interior architecture for chlorosom es of chlorophyll C. aurantiacus. Rather, these antennae constitute the first case of a chromophore-chromophore aggregate functioning as a photosynthetic light harvesting system.

Supramolecular Organization of the Main Photosynthetic Antenna Complex LHCII: A Monomolecular Layer Study

Langmuir ◽  
2009 ◽  
Vol 25 (16) ◽  
pp. 9384-9391 ◽  
Author(s):  
Wiesl̷aw I. Gruszecki ◽  
Ewa Janik ◽  
Rafal Luchowski ◽  
Peter Kernen ◽  
Wojciech Grudzinski ◽  
...  
Keyword(s):  
Supramolecular Organization ◽  
Monomolecular Layer ◽  
Antenna Complex ◽  
Photosynthetic Antenna

scholarly journals A photosynthetic antenna complex foregoes unity carotenoid-to-bacteriochlorophyll energy transfer efficiency to ensure photoprotection

2020 ◽  
Vol 117 (12) ◽  
pp. 6502-6508 ◽  
Author(s):  
Dariusz M. Niedzwiedzki ◽  
David J. K. Swainsbury ◽  
Daniel P. Canniffe ◽  
C. Neil Hunter ◽  
Andrew Hitchcock
Keyword(s):  
Energy Transfer ◽  
Transient Absorption ◽  
Light Harvesting ◽  
Protein Complexes ◽  
Fluorescence Emission ◽  
Energy Transfer Efficiency ◽  
Transfer Efficiency ◽  
Light Harvesting Complexes ◽  
Antenna Complex ◽  
Pigment Protein Complexes

Carotenoids play a number of important roles in photosynthesis, primarily providing light-harvesting and photoprotective energy dissipation functions within pigment–protein complexes. The carbon–carbon double bond (C=C) conjugation length of carotenoids (N), generally between 9 and 15, determines the carotenoid-to-(bacterio)chlorophyll [(B)Chl] energy transfer efficiency. Here we purified and spectroscopically characterized light-harvesting complex 2 (LH2) fromRhodobacter sphaeroidescontaining theN= 7 carotenoid zeta (ζ)-carotene, not previously incorporated within a natural antenna complex. Transient absorption and time-resolved fluorescence show that, relative to the lifetime of the S1state of ζ-carotene in solvent, the lifetime decreases ∼250-fold when ζ-carotene is incorporated within LH2, due to transfer of excitation energy to the B800 and B850 BChlsa. These measurements show that energy transfer proceeds with an efficiency of ∼100%, primarily via the S1→ Qxroute because the S1→ S0fluorescence emission of ζ-carotene overlaps almost perfectly with the Qxabsorption band of the BChls. However, transient absorption measurements performed on microsecond timescales reveal that, unlike the nativeN≥ 9 carotenoids normally utilized in light-harvesting complexes, ζ-carotene does not quench excited triplet states of BChla, likely due to elevation of the ζ-carotene triplet energy state above that of BChla. These findings provide insights into the coevolution of photosynthetic pigments and pigment–protein complexes. We propose that theN≥ 9 carotenoids found in light-harvesting antenna complexes represent a vital compromise that retains an acceptable level of energy transfer from carotenoids to (B)Chls while allowing acquisition of a new, essential function, namely, photoprotective quenching of harmful (B)Chl triplets.

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