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Explore electron conduction in soft matter, electron flow in cyanobacteria and purple bacteria, thermal disorder effects, and more. Witness large conformational changes and energy gap transitions in the photosynthetic reaction center. Unravel the intricacies of electron transfer and ATP synthesis in photosynthetic pathways.
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Photosynthesis 2: Energy conversion and electron conduction in soft matter Electron flow in photosynthesis of cyanobacteria H+ ADP ATP cytoplasm Q/QH2/Q hn ATPase bc1 RC LH-II LH-I periplasm e- H+ cytochrome c2 Electron flow in photosynthesis of purple bacteria
Electron flow in photosynthesis of cyanobacteria and Plants backward direction: respiration = food consumption in mammals From Nature 411, (2001) 897, W. Kuhlbrandt.
Photosynthesis 2: Energy conversion and electron conduction in soft matter Electron flow in photosynthesis of cyanobacteria H+ ADP ATP cytoplasm Q/QH2/Q hn ATPase bc1 RC LH-II LH-I periplasm e- H+ cytochrome c2 Electron flow in photosynthesis of purple bacteria
Role of Thermal Disorder on Electron Transfer in the Photosynthetic Reaction Center Electron transfer is coupled to the thermal motion of the surrounding protein.
Particle – Hole Separation in the Reaction Center and Solar Cells protein protein rotated – 900 and stretched
Cytochrome c2 docking H+ ADP ATP cytoplasm Q/QH2/Q hn ATPase bc1 RC LH-II LH-I periplasm e- H+ cytochrome c2
Photosynthetic Apparatus of Purple Bacteria Iron Sulfur Protein head rotation can redirect 2nd electron two path- ways for oxidation of Qo site Qo Qo 2Fe2S e- 2Fe2S cyt c1 cyt c1 Very Large Conformational Changes Sergei Izrailev
Photosynthetic Apparatus of Purple Bacteria s t a l k Very Large Conformational Changes F1 rotatory catalysis (twist conformational change ATP synthesis ) F1 (from Wang & Oster) elastomechanical coupling F0 ATP synthase energy transformation (proton motive force rotation) (Walker, Whilce, Fillingame) www.ks.uiuc.edu
Photosynthetic Pathway in Cyanobacteria and Plants
Electron Carrying Molecules bacterio- chlorophyll chain bacterio- pheophytin chain ubiquinone chain
Particle – Hole Separation in the Reaction Center and Solar Cells protein protein rotated – 900 and stretched
The energy gap is Gaussian distributed energy gap energy gap
Two State QM System Coupled to Protein Matrix First case: Coupling to a single oscillator Hamiltonian Protein matrix is a bath of oscillators linearly coupled to the electron transfer according to only a single oscillator considered at present!
Two State QM System Coupled to Protein Matrix Second case: Coupling to an ensemble of oscillators Hamiltonian Protein matrix is a bath of oscillators linearly coupled to the electron transfer according to
Electron Transfer Process Coupled to the Protein Matrix Rate for an ensemble of oscillators Relaxation rate But we don’t know all the coupling constants cj ? All we need to know is
Electron Transfer Process Coupled to the Protein Matrix Rate for an ensemble of oscillators Relaxation rate But we don’t know all the coupling constants cj ? All we need to know is
Electron Transfer Process Coupled to the Protein Matrix Relaxation rate 1994 energy gap energy gap correlation function rms deviation of energy gap
