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首页> 外文期刊>Biochemistry >Time-resolved absorption and emission show that the CP43' antenna ring of iron-stressed synechocystis sp. PCC6803 is efficiently coupled to the photosystem I reaction center core
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Time-resolved absorption and emission show that the CP43' antenna ring of iron-stressed synechocystis sp. PCC6803 is efficiently coupled to the photosystem I reaction center core

机译：时间解决的吸收和排放表明，CP43'天线环的铁胁迫Indechocystis sp。 PCC6803有效地耦合到照相I反应中心核心

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摘要

Excitation energy transfer and trapping processes in an iron stress-induced supercomplex of photosystem I from the cyanobacterium Synechocystis sp. PCC6803 were studied by time-resolved absorption and fluorescence spectroscopy on femtosecond and picosecond time scales. The data provide evidence that the energy transfer dynamics of the CP43'-PSI supercomplex are consistent with energy transfer processes that occur in the Chl a network of the PSI trimer antenna. The most significant absorbance changes in the CP43'-PSI supercomplex are observed within the first several picoseconds after the excitation into the spectral region of CP43' absorption(665 nm). The difference time-resolved spectra (DELTADELTAAA) resulting from subtraction of the PSI trimer kinetic data from the CP43'-PSI supercomplex data indicate three energy transfer processes with time constants of 0.2, 1.7, and 10 ps. The 0.2 ps kinetic phase is tentatively interpreted as arising from energy transfer processes originating within or between the CP43' complexes. The 1.7 ps phase is interpreted as possibly arising from energy transfer from the CP43' ring to the PSI trimer via closely located clusters of Chl a in CP43' and the PSI core, while the slower 10 ps process might reflect the overall excitation transfer from the CP43' ring to the PSi trimer. These three fast kinetic phases are followed by a 40 ps overall excitation decay in the supercomplex, in contrast to a 25 ps overall decay observed in the trimer complex without CP43'. Excitation of Chl a in both the CP43'-PSI antenna supercomplex and the PSI trimer completely decays within 100 ps, resulting in the formation of P700~+. The data indicate that there is a rapid and efficient energy transfer between the outer antenna ring and the PSI reaction center complex.
机译：来自Cyanobacterium snocechocystis Sp的光学胁迫诱导的铁胁迫诱导超复用诱发能量转移和捕获过程。通过在飞秒和Pic秒的时间尺度上通过时间分辨的吸收和荧光光谱研究PCC6803。数据提供了证据，即CP43'-PSI超复杂的能量传递动态与PSI三角形天线的CHL网络中发生的能量传递过程一致。在激发到CP43'吸收（665nm）的光谱区域之后，在第一几个皮秒内观察到CP43'-PSI超复杂中最显着的吸光度变化。由CP43'-PSI超复杂数据的PSI三聚体动态数据减法产生的差分时间分辨率谱（DeltaDeltaAA）表示具有0.2,1.7和10 PS的时间常数的三个能量转移过程。 0.2 ps动力相位暂时解释为来自CP43'复合物之间的能量转移过程引起的。 1.7 ps相位被解释为可能从CP43'环的能量转移到PSI三角体通过CP43'和PSI核心的紧密定位，而较慢的10 PS过程可能反映了从中的整体励磁传递CP43'环到PSI三角形。在超复杂中，这三个快速动力学相之后是40ps的整体激发衰减，与在没有CP43'的三聚体复合物中观察到的25ps整体衰减相反。 CP43'-PSI天线超复合器和PSI三聚体在100ps内完全衰减的CHL A激发，导致形成P700〜+的形成。数据表明外天线环和PSI反应中心复合物之间存在快速有效的能量传递。

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  • 来源
    《Biochemistry》 |2003年第13期|共12页
  • 作者

    Alexander N.Melkozernov; Thomas S.Bibby; Su Lin; James Barber; Robert E.Blankenship;

  • 作者单位

    Department of Chemistry and Biochemistry and Center for the Study of Early Events in Photosynthesis Arizona State University Tempe Arizona 85287-1604 and Wolfson Laboratories Department of Biological Sciences Imperial College of Science Technol;

    Department of Chemistry and Biochemistry and Center for the Study of Early Events in Photosynthesis Arizona State University Tempe Arizona 85287-1604 and Wolfson Laboratories Department of Biological Sciences Imperial College of Science Technol;

    Department of Chemistry and Biochemistry and Center for the Study of Early Events in Photosynthesis Arizona State University Tempe Arizona 85287-1604 and Wolfson Laboratories Department of Biological Sciences Imperial College of Science Technol;

    Department of Chemistry and Biochemistry and Center for the Study of Early Events in Photosynthesis Arizona State University Tempe Arizona 85287-1604 and Wolfson Laboratories Department of Biological Sciences Imperial College of Science Technol;

    Department of Chemistry and Biochemistry and Center for the Study of Early Events in Photosynthesis Arizona State University Tempe Arizona 85287-1604 and Wolfson Laboratories Department of Biological Sciences Imperial College of Science Technol;

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  • 正文语种 eng
  • 中图分类 生物化学;
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