Excitation energy-transfer processes between two trimers in C-phycocyanin hexamer from the cyanobacterium Anabaena variabilis. Investigation by group theory and time-resolved fluorescence spectroscopy
✍ Scribed by J.M Zhang; F.L Zhao; X.G Zheng; H.Z Wang; T.-S Yang; M Hayashi; S.H Lin
- Book ID
- 104373558
- Publisher
- Elsevier Science
- Year
- 1999
- Tongue
- English
- Weight
- 254 KB
- Volume
- 53
- Category
- Article
- ISSN
- 1011-1344
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✦ Synopsis
We have employed group theory and picosecond time-resolved fluorescence isotropy and anisotropy spectroscopy methods to explore the excitation transfers within an isolated C-phycocyanin (C-PC) hexamer (ab) 6 PC L 27 RC , situated at the end of the rod proximal to the core of the pycobilisome (PBS) in the cyanobacterium Anabaena variabilis. The group-theory results imply that excitation energy transfer between two trimers occurs between the lowest exciton level of each trimer. The excitation energy-transfer process might occur at a rate of 10-20 ps, and it may be described by an exciton hopping-like Forster transfer mechanism. Dynamic components of 45-50 ps are assigned to the ëxcitation transfer from b 155 -PCB chromophores to the exciton states of dimers, which consist of two neighbouring monomers of the same trimer in an isolated C-PC hexamer.