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NMR evidence for slow collective motions in cyanometmyoglobin

Nature Structural Biologyvolume 4pages292297 (1997) | Download Citation

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Abstract

Residual dipolar couplings observed in NMR spectra at very high magnetic fields have been measured to a high degree of accuracy for the paramagnetic protein cyanometmyoglobin. Deviations of these measurements from predictions based on available crystallographic and solution structures are largely systematic and well correlated within a given helix of this highly α-helical protein. These observations can be explained by invoking collective motion and small displacements of representative helices from their reported average positions in the solid state. Thus, the measurements appear to be capable of providing important insights into slower, collective protein motions, which are likely to be important for function, and which have been difficult to study using established experimental techniques.

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Affiliations

  1. Department of Chemistry, Yale University, New Haven, Connecticut, 06520-8107, USA

    • J. R. Tolman
    •  & J. H. Prestegard
  2. Biology Department, Brookhaven National Laboratories, Upton, New York, 11937, USA

    • J. M. Flanagan
  3. Environmental and Molecular Sciences, Battelle Northwest Laboratory, Richland, Washington, 99352, USA

    • M. A. Kennedy

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https://doi.org/10.1038/nsb0497-292

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