Origin of the Two Bands in the B800 Ring and Their Involvement in the Energy Transfer Network of Allochromatium vinosum,The Journal of Physical Chemistry Letters

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Origin of the Two Bands in the B800 Ring and Their Involvement in the Energy Transfer Network of Allochromatium vinosum
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2018-02-28 00:00:00 , DOI: 10.1021/acs.jpclett.8b00438
Marco Schröter _{1,

2} , Marcelo J. P. Alcocer ₂ , Richard J. Cogdell ₃ , Oliver Kühn ₁ , Donatas Zigmantas ₂

Affiliation

Bacterial photosynthesis features robust and adaptable energy-harvesting processes in which light-harvesting proteins play a crucial role. The peripheral light-harvesting complex of the purple bacterium Allochromatium vinosum is particularly distinct, featuring a double peak structure in its B800 absorption band. Two hypotheses—not necessarily mutually exclusive—concerning the origin of this splitting have been proposed; either two distinct B800 bacteriochlorophyll site energies are involved, or an excitonic dimerization of bacteriochlorophylls within the B800 ring takes place. Through the use of two-dimensional electronic spectroscopy, we present unambiguous evidence that excitonic interaction shapes the split band. We further identify and characterize all of the energy transfer pathways within this complex by using a global kinetic fitting procedure. Our approach demonstrates how the combination of two-dimensional spectral resolution and self-consistent fitting allows for extraction of information on light-harvesting processes, which would otherwise be inaccessible due to signal congestion.

中文翻译：

B800环中的两个谱带的起源及其对异色变色菌能量传递网络的影响

细菌的光合作用具有强大且适应性强的能量收集过程，其中光收集蛋白起着至关重要的作用。紫色菌别色变色菌的外围光收集复合体与众不同的是它的B800吸收带具有双峰结构。关于这种分裂的起源，已经提出了两个假设（不一定是相互排斥的）。或者涉及两个不同的B800细菌叶绿素位点能量，或者B800环内细菌叶绿素的激子二聚化。通过使用二维电子光谱，我们提供了明确的证据，表明激子相互作用形成了分裂带。我们通过使用全局动力学拟合程序，进一步识别和表征该复合物中的所有能量转移途径。我们的方法演示了二维光谱分辨率和自洽拟合的组合如何允许提取有关光收集过程的信息，

更新日期：2018-02-28

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