Structure of the potassium channel
Doyle, MacKinnon and colleagues solved the structure of a bacterial potassium channel, in which four subunits form a cone around a narrow 12 Å selectivity filter lined with oxygen atoms that fits potassium ions but not smaller sodium ions.
As reported in: Doyle, Cabral, Pfuetzner et al. (1998). The Structure of the Potassium Channel: Molecular Basis of K + Conduction and Selectivity. Science. doi:10.1126/science.280.5360.69
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