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  • Title: Freeze-fractured purple membrane particles: protein content.
    Author: Fisher KA, Stoeckenius W.
    Journal: Science; 1977 Jul 01; 197(4298):72-4. PubMed ID: 867052.
    Abstract:
    Optical diffraction and image reconstruction can be used to correlate the electron microscope image of the biological membrane with its electron density projection. Such correlation shows that a single purple membrane particle contains 9 to 12 protein molecules--63 to 84 transmembrane alpha helices--a complexity two to ten times greater than that previously suggested for membrane particles.
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