Abstract
To understand the mechanism of kinesin movement we have investigated the relative configuration of the two kinesin motor domains during ATP hydrolysis using fluorescence polarization microscopy of ensemble and single molecules. We found that: (i) in nucleotide states that induce strong microtubule binding, both motor domains are bound to the microtubule with similar orientations; (ii) this orientation is maintained during processive motion in the presence of ATP; (iii) the neck-linker region of the motor domain has distinct configurations for each nucleotide condition tested. Our results fit well with a hand-over-hand type movement mechanism and suggest how the ATPase cycle in the two motor domains is coordinated. We propose that the motor neck-linker domain configuration controls ADP release.
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Acknowledgements
We thank G. Rogers, D. Sharp, D. Buster and M. Akabas for discussions and critical reading of the manuscript, H. Deng for mass spectrometry analysis and E. Peterman for experimental advice and discussions. This project was supported by a US National Institutes of Health grant to H.S.
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Asenjo, A., Krohn, N. & Sosa, H. Configuration of the two kinesin motor domains during ATP hydrolysis. Nat Struct Mol Biol 10, 836–842 (2003). https://doi.org/10.1038/nsb984
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DOI: https://doi.org/10.1038/nsb984
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