Abstract
The crystal structure of alamethicin in nonaqueous solvent has been determined, and refined at 1.5-Å resolution. The molecular conformation of the three crystallographically independent molecules is largely α-helical with a bend in the helix axis at an internal proline residue. The helix structure is highly amphipathic as most of the solvent-accessible polar atoms lie on a narrow strip of surface parallel to the helix axis. Molecular models for the voltage-gated ion channel, with n-fold symmetry and based on the molecular conformations observed in the crystal, are characterized by strong surface complementarity, a hydrophilic interior and a hydrophobic exterior. The channel structures are stabilized by a hydrated annulus of hydrogen-bonded glutamine residues which produce the greatest restriction in the channel diameter.
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Fox, R., Richards, F. A voltage-gated ion channel model inferred from the crystal structure of alamethicin at 1.5-Å resolution. Nature 300, 325–330 (1982). https://doi.org/10.1038/300325a0
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DOI: https://doi.org/10.1038/300325a0
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