Lecture_24_Nov16_2011

Lecture_24_Nov16_2011 - Introduction to Biophysics Lecture...

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Introduction to Biophysics Lecture 24 Photosynthesis
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Intermolecular energy transfer - energy transfer by radiation - by inductive resonance - by charged carriers
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Antenna and reaction center Large variety of different photosynthetic systems (plants, bacteria, algae) share two common elements: light-harvesting antenna and reaction center (RC).
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Förster Resonance Energy Transfer (FRET) Theodore Förster, 1948 The rate of energy transfer from excited molecule i (donor) to another molecule j (acceptor): ( 29 ( 29 [ ] 6 2 ˆ ˆ ˆ ˆ 3 ˆ ˆ ij ij j ij i j i ij ij R R R S k - = μ S ij ensures that energy conservation law is satisfied dipole-dipole interaction - unit vector in the direction of transition dipole moment R ij - distance between donor and acceptor R ij - unit vector in the direction from donor to acceptor S ij - overlap between energy states of acceptor and donor
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Förster Resonance Energy Transfer ( 29 ( 29 [ ] 6 2 ˆ ˆ ˆ ˆ 3 ˆ ˆ ij ij j ij i j i ij ij R R R S k - = μ Energy transfer probability depends strongly on distance Orientational factor ( 29 ( 29 1 ~ ˆ ˆ ˆ ˆ 3 ˆ ˆ ij j ij i j i R R - κ 2 varies between 0 and 4 For efficient energy transfer k ij must be faster than the rate at which donor
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Lecture_24_Nov16_2011 - Introduction to Biophysics Lecture...

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