The dynamical transition in proteins of bacterial photosynthetic reaction centers observed by echo-detected EPR of specific spin labels

An echo-detected electron paramagnetic resonance (ED EPR) approach was used to study molecular dynamics in photosynthetic reaction centers (RCs) fromRhodobacter sphaeroides R26, employing the specific spin label methanethiosulfonate and 3-maliemido proxyl. ED EPR has recently been shown to be sensit...

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Published in:Applied magnetic resonance 2007-03, Vol.31 (1-2), p.159-166
Main Authors: Borovykh, I. V., Gast, P., Dzuba, S. A.
Format: Article
Language:English
Subjects:
Anharmonicity
Bacteria
Electron paramagnetic resonance
Electron spin
Electron transfer
Labels
Librational motion
Molecular dynamics
Photosynthesis
Temperature dependence
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container_title Applied magnetic resonance
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description An echo-detected electron paramagnetic resonance (ED EPR) approach was used to study molecular dynamics in photosynthetic reaction centers (RCs) fromRhodobacter sphaeroides R26, employing the specific spin label methanethiosulfonate and 3-maliemido proxyl. ED EPR has recently been shown to be sensitive to so-called dynamical transition in disordered media, which is characterized by the transition from a harmonic-like librational motion of a molecule to an anharmonic one or to a stochastic wobbling motion. ED EPR line shapes studied over a wide temperature range reveal a sharp transition occurring above 180 K. The possible relation of the found transition to the temperature dependence of electron transfer reactions in RC is discussed.
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subjects Anharmonicity
Bacteria
Electron paramagnetic resonance
Electron spin
Electron transfer
Labels
Librational motion
Molecular dynamics
Photosynthesis
Temperature dependence
title The dynamical transition in proteins of bacterial photosynthetic reaction centers observed by echo-detected EPR of specific spin labels
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