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EMBO reports 6, 8, 782–786 (2005)
doi:10.1038/sj.embor.7400464
Published online: 8 July 2005
Diffusion of light-harvesting complex II in the thylakoid membranes
Elena Consoli1, Roberta Croce2, David D Dunlap3† & Laura Finzi1, 4
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1 Department of Biology and Interdisciplinary Center for Nanostructured Materials and Interfaces (CIMAINA), University of Milan, Via Celoria 26, 20133 Milan, Italy
2 Istituto di Biofisica, CNR Trento, c/o ITC, via Sommarive 18, 38050 Povo (Trento), Italy
3 ALEMBIC, San Raffaele Scientific Institute, Via Olgettina 58, 20132 Milan, Italy
4 Present address: Department of Physics, Emory University, 1510 Clifton Road, NE, Atlanta, GA 30322-2430, USA
To whom correspondence should be addressed
Laura Finzi Tel: +39 02 503 14856; Fax: +39 02 503 14815; E-mail: laura.finzi@unimi.it
† Present address: Department of Cell Biology, Emory University School of Medicine, 615 Michael Street, Atlanta, GA 30322, USA
Received 5 January 2005; Accepted 30 May 2005; Published online 8 July 2005.
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Abstract
The light-harvesting complex II (LHCII) is the main energy absorber for photosynthesis in green plants, and its translocation between photosystems I and II is the primary means of energy redistribution between them. Using single-particle tracking, we performed the first measurement of the mobility of LHCII in the photosynthetic membranes in both the nonphosphorylated and the phosphorylated (P-LHCII) conformations. These are part of an important, reversible, energy re-equilibration process called the state transition. We found that the population of P-LHCII in unappressed membranes is more mobile than the population of non-P-LHCII from the same regions.
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