The electron crystallographic structure of the aquaporin-1 water channel, determined at ∼6Å, reveals that the protein has six transmembrane αhelices forming a trapezoid-like cylinder. There is a branched rod-like structure within the cylinder that traverses the membrane and likely contains at least one α-helix.
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Li, H., Lee, S. & Jap, B. Molecular design of aquaporin-1 water channel as revealed by electron crystallography. Nat Struct Mol Biol 4, 263–265 (1997). https://doi.org/10.1038/nsb0497-263
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DOI: https://doi.org/10.1038/nsb0497-263
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