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Three-dimensional model of purple membrane obtained by electron microscopy

Naturevolume 257pages2832 (1975) | Download Citation



A 7-Å resolution map of the purple membrane has been obtained by electron microscopy of tilted, unstained specimens. The protein in the membrane contains seven, closely packed, α-helical segments which extend roughly perpendicular to the plane of the membrane for most of its width. Lipid bilayer regions fill the spaces between the protein molecules.

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  1. MRC Laboratory of Molecular biology, Hills Road, Cambridge, CB2 2QH, UK

    • R. Henderson
    •  & P. N. T. Unwin


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