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KcsA is a homotetrameric 68-kDa membrane-associated potassium channel which selectively gates the flux of potassium ions across the membrane. The channel is known to undergo a pH-dependent open-to-closed transition. Here we describe an NMR study of the monomeric subunit of the channel (KcsA M ), solubilized in SDS micelles. Chemical shift, solvent exchange, backbone 15 N relaxation...
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