Picosecond Energy Transfer Between Choromophores in Allophycocyanin Terminal Emitters

Abstract

Abstract: Ultrafast time-resolved fluorescence spectra were used to study the energy transfer kinetics of API and APB from Cynobacteria Spirulina platensis. The same fast lifetime component(38 ps) was found in API and APB monomers which was attributed to energy transfer between α^AP/β^AP, another two lifetimes(198 ps,141 ps) observed describe the energy transfer processes of β^AP→ α^APBand α^AP/ β¹⁸. In trimers, we also found the excited energy transfer between α^AP/β^APin API and APB with 29-32 ps constants. The substitution of α^APBin AP Iand β¹⁸in APB gives rise to a heterogeneity in the chromophore-conformations and chromophore chromophore interactions, another fast lifetimes(68 ps and 50 ps) was also found and attributed to the excited energy transfer between β^AP/ α^APBand α^AP/β¹⁸in the same monomers.

Key words: Phycobilisome, Allophycocyanin, ps time-resolved fluorescence spectra, Energy transfer

CLC Number:

O641

TrendMD:

WANG Hui, ZHAO Jing-Quan, JIANG Li-Jin  . Picosecond Energy Transfer Between Choromophores in Allophycocyanin Terminal Emitters[J]. Chem. J. Chinese Universities, 1999, 20(11): 1746.

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Picosecond Energy Transfer Between Choromophores in Allophycocyanin Terminal Emitters

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