scholarly journals Organization of Chlorophyll a in the Light-Harvesting Chlorophyll a/b Protein Complex as Shown by Circular Dichroism

1983 ◽  
Vol 73 (1) ◽  
pp. 16-19 ◽  
Author(s):  
Ágnes Faludi-Dániel ◽  
László A. Mustárdy
Keyword(s):  
Circular Dichroism ◽  
Chlorophyll A ◽  
Protein Complex ◽  
Light Harvesting ◽  
Circular Dichroïsm

Reversible changes in macroorganization of the light-harvesting chlorophyll a/b pigment-protein complex detected by circular dichroism

Biochemistry ◽  
1988 ◽  
Vol 27 (7) ◽  
pp. 2430-2434 ◽  
Author(s):  
Gyozo Garab ◽  
Richard C. Leegood ◽  
David A. Walker ◽  
John C. Sutherland ◽  
Geoffrey Hind
Keyword(s):  
Circular Dichroism ◽  
Chlorophyll A ◽  
Protein Complex ◽  
Light Harvesting ◽  
Pigment Protein Complex ◽  
Circular Dichroïsm

High-Resolution electron crystallography of the light-harvesting chlorophyll-a/b protein complex from chloroplast membranes

1990 ◽  
Vol 48 (1) ◽  
pp. 610-610
Author(s):  
Werner Kühlbrandt ◽  
Da Neng Wang ◽  
K.H. Downing
Keyword(s):  
High Resolution ◽  
Electron Diffraction ◽  
Chlorophyll A ◽  
Protein Complex ◽  
Structural Integrity ◽  
Light Harvesting ◽  
Lhc Ii ◽  
Diffraction Patterns ◽  
Difference Fourier ◽  
2D Crystals

The light-harvesting chlorophyll-a/b protein complex (LHC-II) is the most abundant membrane protein in the chloroplasts of green plants where it functions as a molecular antenna of solar energy for photosynthesis. We have grown two-dimensional (2d) crystals of the purified, detergent-solubilized LHC-II . The crystals which measured 5 to 10 μm in diameter were stabilized for electron microscopy by washing with a 0.5% solution of tannin. Electron diffraction patterns of untilted 2d crystals cooled to 130 K showed sharp spots to 3.1 Å resolution. Spot-scan images of 2d crystals were recorded at 160 K with the Berkeley microscope . Images of untilted crystals were processed, using the unbending procedure by Henderson et al . A projection map of the complex at 3.7Å resolution was generated from electron diffraction amplitudes and high-resolution phases obtained by image processing .A difference Fourier analysis with the same image phases and electron diffraction amplitudes recorded of frozen, hydrated specimens showed no significant differences in the 3.7Å projection map. Our tannin treatment therefore does not affect the structural integrity of the complex.

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