TCB Publications - Abstract
Thorsten Ritz, Ana Damjanović, Klaus Schulten, Jian-Ping Zhang, and Yasushi Koyama. Efficient light harvesting through carotenoids. Photosynthesis Research, 66:125-144, 2000.
system
of PCP from Amphidinium carterae. In addition, we review
recent spectroscopic data for neurosporene, spheroidene, and
lycopene, three carotenoids with different lengths of conjugated
systems.
On the basis of the measured energies, emission lineshapes,
solution and protein environment lifetimes for their 2A
and
1B
states as well as of the theoretically determined
couplings, we conclude that the transfer efficiencies from the
2A state are controlled by the Car(2A)-BChl(Q
)
electronic couplings and the
2A 
1A internal conversion rates. We suggest
that symmetry breaking and geometry rather than length of
conjugated system dominate couplings involving the 2A
state. Differences in transfer efficiencies from the 1B state
in LH2 and PCP are found to be dominated by the differences in
spectral overlap. The role of the 1B state is likely to be
influenced by a lower-lying (in longer polyenes), optically
forbidden 1B
state. Download Full Text
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