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Fluorescence resonance energy transfer measurements of distances in actin and myosin. A critical evaluation

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Summary

The contractile proteins actin and myosin are of considerable biological interest. They are essential for muscle contraction and in eukaryotic cells they play a crucial role in most contractile phenomena. Over the years since the first fluorescence resonance energy transfer (FRET) paper appeared, an extensive body of literature has accumulated on this technique using actin, myosin and the actomyosin complex. These papers are reviewed with several aims in mind: (i) we assess the reliability and consistency of intra- and inter-molecular distances measured between the fluorescent probes attached to specific sites on these proteins; (ii) we determine whether the measurements can be assembled into an internally consistent model which can be fitted to the known dimensions of the actomyosin complex; (iii) several of the FRET distances are consistent with the available structural data from crystallographic and electron microscopic dimensions; (iv) the modelled FRET distances suggest that the assumed value of the orientation factor (K 2 = 2/3) is reasonable; (v) we conclude that the model has a predictive value, i.e. it suggests that a small number of the published dimensions may be incorrect and predicts the magnitude of a larger number of measurements which have not yet been reported; and finally (vi) we discuss the contribution of FRET determinations to the current debate on the molecular mechanism of contraction.

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  1. Muscle Research Unit, Department of Anatomy, The University of Sydney, 2006, Sydney, Australia

    Cristobal G. dos Remedios, Masao Miki & Julian A. Barden

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  1. Cristobal G. dos Remedios
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  2. Masao Miki
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  3. Julian A. Barden
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dos Remedios, C.G., Miki, M. & Barden, J.A. Fluorescence resonance energy transfer measurements of distances in actin and myosin. A critical evaluation. J Muscle Res Cell Motil 8, 97–117 (1987). https://doi.org/10.1007/BF01753986

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