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Efficient energy transfer in light-harvesting systems, III: The influence of the eighth bacteriochlorophyll on the dynamics and efficiency in FMO
Biological Physics · Submitted 14 Sep 2011
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim Finally we confirm that the energy transfer process in the eight site FMO complex remains efficient and robust.
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The abstract, sentence by sentence
The most recent crystal structure of the Fenna-Matthews-Olson (FMO) protein complex indicates that each subunit contains an additional eighth chromophore. It has been proposed that this extra site functions as a link between the chlorosome antenna complex and the remaining seven chromophores in FMO [Schmidt am Busch et al, J. Phys. Chem. Lett., {\bf 2}, 93 (2011)]. Here, we investigate the implications of this scenario through numerical calculations with the generalized Bloch-Redfield (GBR) equation and the non-interacting blip approximation (NIBA). Three key insights into the population dynamics and energy transfer efficiency in FMO are provided. First, it is shown that the oscillations that are often observed in the population relaxation of the dimer composed of sites one and two may be completely suppressed in the eight site model. The presence of the coherent oscillations is shown to depend upon the particular initial preparation of the dimer state. Secondly it is demonstrated that while the presence of the eighth chromophore does not cause a dramatic change in the energy transfer efficiency, it does however lead to a dominant energy transfer pathway which can be characterized by an effective three site system arranged in an equally spaced downhill configuration. Such a configuration leads to an optimal value of the site energy of the eighth chromophore which is shown to be near to its suggested value. Finally we confirm that the energy transfer process in the eight site FMO complex remains efficient and robust. The optimal values of the bath parameters are computed and shown to be closer to the experimentally fitted values than those calculated previously for the seven site system.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | The most recent crystal structure of the Fenna-Matthews-Olson (FMO) protein complex indicates that each subunit contains an additional eighth chromophore. | background 1.00 | 0.06 | 0.03 | hedged possibility 0.78 |
| s1 | It has been proposed that this extra site functions as a link between the chlorosome antenna complex and the remaining seven chromophores in FMO [Schmidt am Busch et al, J. Phys. Chem. | background 1.00 | 0.04 | 0.05 | hedged possibility 0.76 |
| s2 | Lett., {\bf 2}, 93 (2011)]. | background 1.00 | 0.04 | 0.02 | unclear 0.98 |
| s3 | Here, we investigate the implications of this scenario through numerical calculations with the generalized Bloch-Redfield (GBR) equation and the non-interacting blip approximation (NIBA). | method 0.95 | 0.87 | 0.03 | asserted 0.85 |
| s4 | Three key insights into the population dynamics and energy transfer efficiency in FMO are provided. | contribution 0.82 | 0.80 | 0.07 | asserted 0.94 |
| s5 | First, it is shown that the oscillations that are often observed in the population relaxation of the dimer composed of sites one and two may be completely suppressed in the eight site model. | result 1.00 | 0.92 | 0.14 | hedged possibility 0.80 |
| s6 | The presence of the coherent oscillations is shown to depend upon the particular initial preparation of the dimer state. | result 0.99 | 0.84 | 0.05 | asserted 1.00 |
| s7 | Secondly it is demonstrated that while the presence of the eighth chromophore does not cause a dramatic change in the energy transfer efficiency, it does however lead to a dominant energy transfer pathway which can be characterized by an effective three site system arranged in an equally spaced downhill configuration. | result 0.99 | 0.94 | 0.51 | asserted 1.00 |
| s8 | Such a configuration leads to an optimal value of the site energy of the eighth chromophore which is shown to be near to its suggested value. | result 0.96 | 0.92 | 0.12 | asserted 0.99 |
| s9 | Finally we confirm that the energy transfer process in the eight site FMO complex remains efficient and robust. | result 0.99 | 0.92 | 0.37 | asserted 1.00 |
| s10 | The optimal values of the bath parameters are computed and shown to be closer to the experimentally fitted values than those calculated previously for the seven site system. | result 1.00 | 0.94 | 0.10 | asserted 1.00 |
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The paper
Original abstract
The most recent crystal structure of the Fenna-Matthews-Olson (FMO) protein complex indicates that each subunit contains an additional eighth chromophore. It has been proposed that this extra site functions as a link between the chlorosome antenna complex and the remaining seven chromophores in FMO [Schmidt am Busch et al, J. Phys. Chem. Lett., {\bf 2}, 93 (2011)]. Here, we investigate the implications of this scenario through numerical calculations with the generalized Bloch-Redfield (GBR) equation and the non-interacting blip approximation (NIBA). Three key insights into the population dynamics and energy transfer efficiency in FMO are provided. First, it is shown that the oscillations that are often observed in the population relaxation of the dimer composed of sites one and two may be completely suppressed in the eight site model. The presence of the coherent oscillations is shown to depend upon the particular initial preparation of the dimer state. Secondly it is demonstrated that while the presence of the eighth chromophore does not cause a dramatic change in the energy transfer efficiency, it does however lead to a dominant energy transfer pathway which can be characterized by an effective three site system arranged in an equally spaced downhill configuration. Such a configuration leads to an optimal value of the site energy of the eighth chromophore which is shown to be near to its suggested value. Finally we confirm that the energy transfer process in the eight site FMO complex remains efficient and robust. The optimal values of the bath parameters are computed and shown to be closer to the experimentally fitted values than those calculated previously for the seven site system.
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How the literature uses it
1 arXiv paper cite this in 2 sentences
Papers citing it · 1 sentence without a confident label
Cites it as background 1 paper
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Until very recently [ref] site 1 and 6 have been thought as the entry point of an exciton in the FMO complex, therefore most of the previous literature chose the initial reduced density matrix to be either pure states $|1⟩⟨1|$ or $|6⟩⟨6|$ [ref] .
Atomistic study of the long-lived quantum coherences in the Fenna-Matthews-Olson complex · Population dynamics and long-lived quantum coherence · 0.80
What it cites · 6 sentences without a confident label
Uses the method or tool of 1 paper
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The population dynamics described in Ref. [ref] may be formulated as an equivalent generalized master equation [ref] [equation] where $P_n(t)$ denotes the population of site $n$ at time $t$.
The Physical Basis for Long-lived Electronic Coherence in Photosynthetic Light Harvesting Systems · Population Dynamics and suppression of the oscillations · 0.86
Compares with 1 paper
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Without this decay, the two-site dynamics reproduce those of Ref. [ref] .
The Physical Basis for Long-lived Electronic Coherence in Photosynthetic Light Harvesting Systems · Population Dynamics and suppression of the oscillations · 0.89
Cites as background 2 papers
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[ref] Here, we choose the approximate generalized Bloch-Redfield (GBR) method which follows from a second order cumulant expansion in the system-bath interaction.
Energy-scales convergence for optimal and robust quantum transport in photosynthetic complexes · Generalized Bloch-Redfield Equation · 0.93
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[ref] Here, we choose the approximate generalized Bloch-Redfield (GBR) method which follows from a second order cumulant expansion in the system-bath interaction.
The Physical Basis for Long-lived Electronic Coherence in Photosynthetic Light Harvesting Systems · Generalized Bloch-Redfield Equation · 0.93
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