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    Transmembrane Helix Orientation and Dynamics: Insights from Ensemble Dynamics with Solid-State NMR Observables

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    Wonpil_v100_p2913-2921.pdf (842.6Kb)
    Issue Date
    2011-06-22
    Author
    Jo, Sunhwan
    Im, Wonpil
    Publisher
    Elsevier
    Type
    Article
    Article Version
    Scholarly/refereed, publisher version
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    Abstract
    As the major component of membrane proteins, transmembrane helices embedded in anisotropic bilayer environments adopt preferential orientations that are characteristic or related to their functional states. Recent developments in solid-state nuclear magnetic resonance (SSNMR) spectroscopy have made it possible to measure NMR observables that can be used to determine such orientations in a native bilayer environment. A quasistatic single conformer model is frequently used to interpret the SSNMR observables, but important motional information can be missing or misinterpreted in the model. In this work, we have investigated the orientation of the single-pass transmembrane domain of viral protein ”u“ (VpuTM) from HIV-1 by determining an ensemble of structures using multiple conformer models based on the SSNMR ensemble dynamics technique. The resulting structure ensemble shows significantly larger orientational fluctuations while the ensemble-averaged orientation is compatible with the orientation based on the quasistatic model. This observation is further corroborated by comparison with the VpuTM orientation from comparative molecular dynamics simulations in explicit bilayer membranes. SSNMR ensemble dynamics not only reveals the importance of transmembrane helix dynamics in interpretation of SSNMR observables, but also provides a means to simultaneously extract both transmembrane helix orientation and dynamics information from the SSNMR measurements.
    Description
    This is the publisher's version. Copyright 2011 by Elsevier.
    URI
    http://hdl.handle.net/1808/17474
    DOI
    https://doi.org/10.1016/j.bpj.2011.05.009
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    • Molecular Biosciences Scholarly Works [458]
    Citation
    Jo, Sunhwan, and Wonpil Im. "Transmembrane Helix Orientation and Dynamics: Insights from Ensemble Dynamics with Solid-State NMR Observables." Biophysical Journal 100.12 (2011): 2913-921. http://dx.doi.org/10.1016/j.bpj.2011.05.009.

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    Contact KU ScholarWorks
    785-864-8983
    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    785-864-8983

    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    Image Credits
     

     

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