scholarly journals Low Light Adaptation: Energy Transfer Processes in Different Types of Light Harvesting Complexes from Rhodopseudomonas palustris

2009 ◽  
Vol 97 (11) ◽  
pp. 3019-3028 ◽  
Author(s):  
Vladimíra Moulisová ◽  
Larry Luer ◽  
Sajjad Hoseinkhani ◽  
Tatas H.P. Brotosudarmo ◽  
Aaron M. Collins ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Light Adaptation ◽  
Light Harvesting ◽  
Rhodopseudomonas Palustris ◽  
Low Light ◽  
Light Harvesting Complexes ◽  
Transfer Processes ◽  
Different Types

scholarly journals The light intensity under which cells are grown controls the type of peripheral light-harvesting complexes that are assembled in a purple photosynthetic bacterium

2011 ◽  
Vol 440 (1) ◽  
pp. 51-61 ◽  
Author(s):  
Tatas H. P. Brotosudarmo ◽  
Aaron M. Collins ◽  
Andrew Gall ◽  
Aleksander W. Roszak ◽  
Alastair T. Gardiner ◽  
...  
Keyword(s):  
Light Intensity ◽  
Light Harvesting ◽  
Rhodopseudomonas Palustris ◽  
Photosynthetic Bacterium ◽  
Low Light ◽  
Light Harvesting Complexes ◽  
Density Maps ◽  
Purple Photosynthetic Bacterium ◽  
Resonance Raman Spectra ◽  
Apoprotein Composition

The differing composition of LH2 (peripheral light-harvesting) complexes present in Rhodopseudomonas palustris 2.1.6 have been investigated when cells are grown under progressively decreasing light intensity. Detailed analysis of their absorption spectra reveals that there must be more than two types of LH2 complexes present. Purified HL (high-light) and LL (low-light) LH2 complexes have mixed apoprotein compositions. The HL complexes contain PucABa and PucABb apoproteins. The LL complexes contain PucABa, PucABd and PucBb-only apoproteins. This mixed apoprotein composition can explain their resonance Raman spectra. Crystallographic studies and molecular sieve chromatography suggest that both the HL and the LL complexes are nonameric. Furthermore, the electron-density maps do not support the existence of an additional Bchl (bacteriochlorophyll) molecule; rather the density is attributed to the N-termini of the α-polypeptide.

scholarly journals Energy transfer processes in Rhodopseudomonas palustris grown under low-light conditions

FEBS Letters ◽  
1993 ◽  
Vol 329 (3) ◽  
pp. 319-323 ◽  
Author(s):  
Yoshinobu Nishimura ◽  
Keizo Shimada ◽  
Iwao Yamazaki ◽  
Mamoru Mimuro
Keyword(s):  
Energy Transfer ◽  
Rhodopseudomonas Palustris ◽  
Light Conditions ◽  
Low Light ◽  
Transfer Processes

Quantum Coherent Energy Transfer over Varying Pathways in Single Light-Harvesting Complexes

Science ◽  
2013 ◽  
Vol 340 (6139) ◽  
pp. 1448-1451 ◽  
Author(s):  
R. Hildner ◽  
D. Brinks ◽  
J. B. Nieder ◽  
R. J. Cogdell ◽  
N. F. van Hulst
Keyword(s):  
Energy Transfer ◽  
Light Harvesting ◽  
Light Harvesting Complexes

Structure of the maize photosystem I supercomplex with light-harvesting complexes I and II

Science ◽  
2018 ◽  
Vol 360 (6393) ◽  
pp. 1109-1113 ◽  
Author(s):  
Xiaowei Pan ◽  
Jun Ma ◽  
Xiaodong Su ◽  
Peng Cao ◽  
Wenrui Chang ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Energy Transfer ◽  
Complex I ◽  
Light Harvesting ◽  
Light Conditions ◽  
Light Harvesting Complexes ◽  
Light Harvesting Complex ◽  
Cryo Electron Microscopy ◽  
Photosystems I And Ii ◽  
Light Harvesting Complex Ii

Plants regulate photosynthetic light harvesting to maintain balanced energy flux into photosystems I and II (PSI and PSII). Under light conditions favoring PSII excitation, the PSII antenna, light-harvesting complex II (LHCII), is phosphorylated and forms a supercomplex with PSI core and the PSI antenna, light-harvesting complex I (LHCI). Both LHCI and LHCII then transfer excitation energy to the PSI core. We report the structure of maize PSI-LHCI-LHCII solved by cryo–electron microscopy, revealing the recognition site between LHCII and PSI. The PSI subunits PsaN and PsaO are observed at the PSI-LHCI interface and the PSI-LHCII interface, respectively. Each subunit relays excitation to PSI core through a pair of chlorophyll molecules, thus revealing previously unseen paths for energy transfer between the antennas and the PSI core.

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