ICCAS OpenIR
Triplet excitation transfer between carotenoids in the LH2 complex from photosynthetic bacterium Rhodopseudomonas palustris
Feng, J; Wang, Q; Wu, YS; Ai, XC; Zhang, XJ; Huang, YG; Zhang, XK; Zhang, JP
2004
Source PublicationPHOTOSYNTHESIS RESEARCH
ISSN0166-8595
Volume82Issue:1Pages:83-94
AbstractWe have studied, by means of sub-microsecond time-resolved absorption spectroscopy, the triplet-excited state dynamics of carotenoids (Cars) in the intermediate-light adapted LH2 complex (ML - LH2) from Rhodopseudomonas palustris containing Cars with different numbers of conjugated double bonds. Following pulsed photo-excitation at 590 nm at room temperature, rapid spectral equilibration was observed either as a red shift of the isosbestic wavelength on a time scale of 0.6 - 1.0 mus, or as a fast decay in the shorter-wavelength side of the T-n <-- T-1 absorption of Cars with a time constant of 0.5 - 0.8 μs. Two major spectral components assignable to Cars with 11 and 12 conjugated double bonds were identified. The equilibration was not observed in the ML - LH2 at 77 K, or in the LH2 complex from Rhodobacter sphaeroides G1C containing a single type of Car. The unique spectral equilibration was ascribed to temperature-dependent triplet excitation transfer among different Car compositions. The results suggest that Cars of 11 and 12 conjugated bonds, both in close proximity of BChls, may coexist in an α,β-subunit of the ML - LH2 complex.
KeywordBacteriochlorophyll Carotenoid Light-harvesting Antenna Complex Time-resolved Spectroscopy Triplet Excitation Transfer
Indexed BySCI
Language英语
WOS IDWOS:000223741100007
PublisherKLUWER ACADEMIC PUBL
Citation statistics
Cited Times:15[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/82286
Collection中国科学院化学研究所
Corresponding AuthorZhang, JP
Affiliation1.Chinese Acad Sci, Inst Chem, State Key Lab Struct Chem Unstable & Stable Speci, Beijing 100080, Peoples R China
2.Chinese Acad Sci, Inst Biophys, Natl Lab Biomacromol, Beijing 100101, Peoples R China
Recommended Citation
GB/T 7714
Feng, J,Wang, Q,Wu, YS,et al. Triplet excitation transfer between carotenoids in the LH2 complex from photosynthetic bacterium Rhodopseudomonas palustris[J]. PHOTOSYNTHESIS RESEARCH,2004,82(1):83-94.
APA Feng, J.,Wang, Q.,Wu, YS.,Ai, XC.,Zhang, XJ.,...&Zhang, JP.(2004).Triplet excitation transfer between carotenoids in the LH2 complex from photosynthetic bacterium Rhodopseudomonas palustris.PHOTOSYNTHESIS RESEARCH,82(1),83-94.
MLA Feng, J,et al."Triplet excitation transfer between carotenoids in the LH2 complex from photosynthetic bacterium Rhodopseudomonas palustris".PHOTOSYNTHESIS RESEARCH 82.1(2004):83-94.
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