Part I. The Shape of the Channel

We approximate the shape of the potassium channel by rotating the closed curve around the symmetrical, z-axis, by 360 degrees. The channel is composed of two segments - A wide segment of length 28 angstrom lined with hydrophobic amino acids extending towards the intracellular space -
and a narrow selectivity filter with approximate length 12 angstrom and diameter 2.8 angstrom extending towards the extracellular space.
The selectivity filter is formed by 4 identical peptide chains - Here we show two of these chains.
Each is chain composed of glycine, tyrosine, valine and threonine residues.

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Last modified: Fri Nov 20 12:07:02 "EST 1998