Energy transfer dynamics in light-harvesting assemblies templated by the tobacco mosaic virus coat protein |
| |
Authors: | Ma Ying-Zhong Miller Rebekah A Fleming Graham R Francis Matthew B |
| |
Institution: | Department of Chemistry, University of California, Berkeley, California 94720-1460, USA. |
| |
Abstract: | Picosecond time-resolved fluorescence spectroscopy was used to characterize energy transfer between chromophores displayed on a rod assembly of tobacco mosaic virus coat protein. The incorporation of donor chromophores with broad and overlapping absorption and emission spectra creates an "antenna" with a large absorption cross section, which can convey excitation energy over large distances before transfer to an acceptor chromophore. The possibility for both donor-to-donor and donor-to-acceptor transfer results in complex kinetic behavior at any single wavelength. Thus, to describe the various pathways of energy transfer within this system accurately, a global lifetime analysis was performed to obtain decay associated spectra. We found the energy transfer from donor to acceptor chromophores occurs in 187 ps with an efficiency of 36%. A faster decay component of 70 ps was also observed from global lifetime analysis and is attributed to donor-to-donor transfer. Although more efficient three-chromophore systems have been demonstrated, a two-chromophore system was studied here to facilitate analysis. |
| |
Keywords: | |
本文献已被 PubMed 等数据库收录! |
|