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. Author manuscript; available in PMC: 2009 Sep 5.
Published in final edited form as: J Mol Biol. 2008 Jun 10;381(3):655–669. doi: 10.1016/j.jmb.2008.06.011

Scheme 1.

Scheme 1

Depiction of ligand-dependent activation mechanism for MlotiK1 channels. In the first step, ligand (cAMP) binds to unbound CNB domain (C) to form liganded but closed channels (C•cAMP). In the second step, the channels undergo an allosteric rearrangement to open (O•cAMP).