Light-induced excitation energy redistribution in Spirulina platensis cells: "spillover" or "mobile PBSs"?
Li, DH; Xie, J; Zhao, JQ; Xia, AD; Li, DH; Gong, YD
AbstractState transitions induced by light and redox were investigated by observing the 77 K fluorescence spectra for the intact cells of Spirulina platensis. To clarify if phycobilisomes (PBSs) take part in the state transition, the contributions of PBSs to light-induced state transition were studied in untreated cells and the cells treated by betaine which fixed PBSs firmly on the thylakoid membranes. It was observed that the betaine-treated cells did not show any light-induced state transition. This result definitely confirmed that the light-induced excitation energy regulation between the two photosystems is mainly dependent on a spatial movement of PBSs on the thylakoid membranes, which makes PBS cores partially decoupled from photosystem II (PSII) while PBS rods more strongly coupled with photosystem I (PSI) during the transition from state 1 to state 2. On the other hand, an energy exchange between the two photosystems was observed in both untreated and betaine-treated cells during redox-induced state transition. These observations suggested that two different mechanisms were involved in the light-induced state transition and the redox-induced one. The former involves only a physical movement of PBSs, while the latter involves not only the movement of PBS but also energy spillover from PSII to PSI. A model for light-induced state transition was proposed based on the current results as well as well known knowledge. (C) 2003 Elsevier B.V. All rights reserved.
KeywordC-pc Apc Psi Psii State Transition Energy Transfer
Indexed BySCI
WOS IDWOS:000220012300004
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Document Type期刊论文
Corresponding AuthorZhao, JQ
Affiliation1.Chinese Acad Sci, Inst Chem, Ctr Mol Sci, Key Lab Photochem, Beijing 100080, Peoples R China
2.Tsing Hua Univ, Dept Biol Sci & Biotechnol, State Key Lab Biomembrane & Membrane Biotechnol, Beijing 100084, Peoples R China
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Li, DH,Xie, J,Zhao, JQ,et al. Light-induced excitation energy redistribution in Spirulina platensis cells: "spillover" or "mobile PBSs"?[J]. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS,2004,1608(2-3):114-121.
APA Li, DH,Xie, J,Zhao, JQ,Xia, AD,Li, DH,&Gong, YD.(2004).Light-induced excitation energy redistribution in Spirulina platensis cells: "spillover" or "mobile PBSs"?.BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS,1608(2-3),114-121.
MLA Li, DH,et al."Light-induced excitation energy redistribution in Spirulina platensis cells: "spillover" or "mobile PBSs"?".BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 1608.2-3(2004):114-121.
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