photosynthesis 2: energy conversion and electron conduction in soft matter lh-iilh-i cytochrome c 2...
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![Page 1: Photosynthesis 2: Energy conversion and electron conduction in soft matter LH-IILH-I cytochrome c 2 ATPase cytoplasm periplasm ADPATP h bc 1 H+H+ H+H+](https://reader035.vdocuments.mx/reader035/viewer/2022062809/5697bf7c1a28abf838c84098/html5/thumbnails/1.jpg)
Photosynthesis 2: Energy conversion and electron conduction in soft matter
LH-II LH-I
cytochrome c2
ATPase
cytoplasm
periplasm
ADP ATP
hbc1
H+
H+
e-
Q/QH2/Q
RC
Electron flow in photosynthesis of cyanobacteria
Electron flow in photosynthesis of purple bacteria
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From Nature 411, (2001) 897, W. Kuhlbrandt.
Electron flow in photosynthesis of cyanobacteriaand Plants
backward direction: respiration = food consumption in mammals
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Photosynthesis 2: Energy conversion and electron conduction in soft matter
LH-II LH-I
cytochrome c2
ATPase
cytoplasm
periplasm
ADP ATP
hbc1
H+
H+
e-
Q/QH2/Q
RC
Electron flow in photosynthesis of cyanobacteria
Electron flow in photosynthesis of purple bacteria
![Page 4: Photosynthesis 2: Energy conversion and electron conduction in soft matter LH-IILH-I cytochrome c 2 ATPase cytoplasm periplasm ADPATP h bc 1 H+H+ H+H+](https://reader035.vdocuments.mx/reader035/viewer/2022062809/5697bf7c1a28abf838c84098/html5/thumbnails/4.jpg)
Role of Thermal Disorder on Electron Transfer in the Photosynthetic Reaction Center
Electron transfer is coupled to the thermal motion of thesurrounding protein.
![Page 5: Photosynthesis 2: Energy conversion and electron conduction in soft matter LH-IILH-I cytochrome c 2 ATPase cytoplasm periplasm ADPATP h bc 1 H+H+ H+H+](https://reader035.vdocuments.mx/reader035/viewer/2022062809/5697bf7c1a28abf838c84098/html5/thumbnails/5.jpg)
Particle – Hole Separation in the Reaction Center and Solar Cells
proteinprotein rotated – 900 and stretched
![Page 6: Photosynthesis 2: Energy conversion and electron conduction in soft matter LH-IILH-I cytochrome c 2 ATPase cytoplasm periplasm ADPATP h bc 1 H+H+ H+H+](https://reader035.vdocuments.mx/reader035/viewer/2022062809/5697bf7c1a28abf838c84098/html5/thumbnails/6.jpg)
LH-II LH-I
cytochrome c2
ATPase
cytoplasm
periplasm
ADP ATP
hbc1
H+
H+
e-
Q/QH2/Q
RC
Cytochrome c2 docking
![Page 7: Photosynthesis 2: Energy conversion and electron conduction in soft matter LH-IILH-I cytochrome c 2 ATPase cytoplasm periplasm ADPATP h bc 1 H+H+ H+H+](https://reader035.vdocuments.mx/reader035/viewer/2022062809/5697bf7c1a28abf838c84098/html5/thumbnails/7.jpg)
Photosynthetic Apparatus of Purple Bacteria
Very Large Conformational Changes
Qo
2Fe2Se-
Qo
cyt c12Fe2S cyt c1
two path-ways for oxidation of Qo site
Iron Sulfur Protein head rotationcan redirect2nd electron
Sergei Izrailev
![Page 8: Photosynthesis 2: Energy conversion and electron conduction in soft matter LH-IILH-I cytochrome c 2 ATPase cytoplasm periplasm ADPATP h bc 1 H+H+ H+H+](https://reader035.vdocuments.mx/reader035/viewer/2022062809/5697bf7c1a28abf838c84098/html5/thumbnails/8.jpg)
Photosynthetic Apparatus of Purple Bacteria
Very Large Conformational Changes
ATP synthaseenergy transformation(proton motive force rotation)
elastomechanical coupling
rotatory catalysis(twist conformational change ATP synthesis )
F1
F1
F0
stalk
(from Wang & Oster)
(Walker, Whilce,Fillingame)www.ks.uiuc.edu
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Photosynthetic Pathway inCyanobacteria and Plants
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bacterio-chlorophyll
bacterio-pheophytin
ubiquinone
Electron Carrying Molecules
chain
chain
chain
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Particle – Hole Separation in the Reaction Center and Solar Cells
proteinprotein rotated – 900 and stretched
![Page 12: Photosynthesis 2: Energy conversion and electron conduction in soft matter LH-IILH-I cytochrome c 2 ATPase cytoplasm periplasm ADPATP h bc 1 H+H+ H+H+](https://reader035.vdocuments.mx/reader035/viewer/2022062809/5697bf7c1a28abf838c84098/html5/thumbnails/12.jpg)
energy gap
energy gap
The energy gap is Gaussian distributed
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Two State QM System Coupled to Protein Matrix
Hamiltonian
Protein matrix is a bath of oscillators linearlycoupled to the electron transfer according to
only a single oscillator considered at present!
First case: Coupling to a single oscillator
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Hamiltonian
Protein matrix is a bath of oscillators linearlycoupled to the electron transfer according to
Two State QM System Coupled to Protein Matrix
Second case: Coupling to an ensemble of oscillators
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Electron Transfer Process Coupled to the Protein Matrix
Rate for an ensemble of oscillators
But we don’t know all the coupling constants cj ? All we need to know is
Relaxation rate
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Solution of Rate Equation
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Electron Transfer Process Coupled to the Protein Matrix
Rate for an ensemble of oscillators
But we don’t know all the coupling constants cj ? All we need to know is
Relaxation rate
![Page 18: Photosynthesis 2: Energy conversion and electron conduction in soft matter LH-IILH-I cytochrome c 2 ATPase cytoplasm periplasm ADPATP h bc 1 H+H+ H+H+](https://reader035.vdocuments.mx/reader035/viewer/2022062809/5697bf7c1a28abf838c84098/html5/thumbnails/18.jpg)
Electron Transfer Process Coupled to the Protein Matrix
Relaxation rate
energy gap correlation functionenergy gap
rms deviation of energy gap
1994
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Temperature Dependence of Electron Transfer Rate