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Proceedings Paper

Anti-correlation of the emission from different red pools in photosystem I
Author(s): M. Brecht; V. Radics; J. B. Nieder; R. Bittl
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Paper Abstract

Electron and energy transfer in proteins are key processes in bioenergetics. Their understanding on a molecular level can serve as an important guideline for the design of nanoscale assemblies. Energy transfer between pigment molecules requires a match between their transition energies for energy emission and absorption. The tuning of these pigment energies in proteins is achieved by pigment-protein interactions. In general, these interactions are regarded as static properties determined by the three-dimensional structure of pigment-protein complexes. Employing single-molecule fluorescence spectroscopy we demonstrate that protein dynamics, even at cryogenic temperatures, significantly influences the transition energy of pigments and, as a consequence, modulates energy transfer pathways. This variability of excitation energy transfer pathways introduced by protein dynamics might be important for the extreme robustness of photosystems.

Paper Details

Date Published: 24 February 2009
PDF: 10 pages
Proc. SPIE 7185, Single Molecule Spectroscopy and Imaging II, 718506 (24 February 2009); doi: 10.1117/12.809303
Show Author Affiliations
M. Brecht, Freie Univ. Berlin (Germany)
V. Radics, Freie Univ. Berlin (Germany)
J. B. Nieder, Freie Univ. Berlin (Germany)
R. Bittl, Freie Univ. Berlin (Germany)

Published in SPIE Proceedings Vol. 7185:
Single Molecule Spectroscopy and Imaging II
Jörg Enderlein; Zygmunt Karol Gryczynski; Rainer Erdmann, Editor(s)

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