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1 Ser

a helix. In this example, the polar residues (blue) are on one side of the helix and the hydrophobic residues (yellow) on the other. This is, by definition, an amphipathic helix. (c) Side-by-side association of five or six amphipathic helices, each with its polar face oriented toward the central cavity, can produce a transmembrane channel lined with polar and charged residues. This channel provides many opportunities for hydrogen bonding with glucose as it moves through the transporter. The three-dimensional structure of GLUT1 has not yet been determined by x-ray crystallography, but researchers expect that the hydrophilic transmembrane channels of this and many other transporters and ion channels will resemble this model.

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