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The reaction center profile structure derived from neutron diffraction

J M Pachence, P L Dutton, J K Blasie

    Biochimica Et Biophysica Acta
    |April 13, 1981
    PubMed
    Summary
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    Researchers used neutron diffraction to study photosynthetic reaction center proteins within lipid bilayers. The results show the protein spans the membrane with an uneven mass distribution, providing a detailed structural profile.

    Area of Science:

    • Structural biology
    • Biophysics
    • Membrane protein structure

    Background:

    • Photosynthetic reaction center (RC) proteins are crucial for energy conversion.
    • Understanding membrane protein structure is key to deciphering biological functions.
    • Reconstituting proteins into lipid bilayers allows for controlled structural studies.

    Purpose of the Study:

    • To determine the structural profile of the Rhodopseudomonas sphaeroides reaction center protein within a lipid bilayer.
    • To investigate the spatial arrangement and mass distribution of the protein across the membrane.
    • To achieve high-resolution structural insights into membrane protein organization.

    Main Methods:

    • Deuterium labeling of both reaction center protein and egg phosphatidylcholine.

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  • Formation of homogeneous unilamellar vesicles incorporating the labeled protein into lipid bilayers.
  • Lamellar neutron diffraction from oriented membrane multilayers.
  • Combining neutron diffraction data with existing X-ray diffraction data.

    • Main Results:

    • Direct determination of the reaction center and lipid profiles to 32 Å resolution.
    • The reaction center protein was shown to span the entire membrane.
    • An asymmetric mass distribution of the protein along the membrane normal was observed.
    • Combined data extended the structural resolution of the reaction center profile to 9 Å.

    Conclusions:

    • The study provides a high-resolution structural model of the photosynthetic reaction center within a lipid bilayer.
    • Neutron diffraction is a powerful technique for elucidating membrane protein structure and organization.
    • The asymmetric protein structure suggests specific functional or interactional roles within the membrane environment.