Cyclic @entity377 -sensitive ion channels, known as HCN and CNG channels, are activated by binding of ligands to a domain (CNBD) located on the cytoplasmic side of the channel. The underlying mechanisms are not well understood. To elucidate the gating mechanism, structures of both the ligand-free and -bound CNBD are required. Several crystal structures of the CNBD from HCN2 and a bacterial CNG channel (MloK1) have been solved. However, for HCN2, the @entity268 -free and -bound state did not reveal substantial structural rearrangements. For MloK1, structural information for the @entity268 -free state has only been gained from mutant CNBDs. Moreover, in the crystal, the CNBD molecules form an interface between dimers, proposed to be important for allosteric channel gating. Here, we have determined the solution structure by NMR spectroscopy of the @entity268 -free wild-type CNBD of MloK1. A comparison of the solution structure of @entity268 -free and -bound states reveals large conformational rearrangement on ligand binding. The two structures provide insights on a unique set of conformational events that accompany gating within the ligand-binding site.

Structural insights into conformational changes of a cyclic XXXX -binding domain in solution from Mesorhizobium loti K1 channel.

@entity268 :: ('CHEBI:17489', 'Chemical') :: ['cAMP'] @entity377 :: ('CHEBI:36976', 'Chemical') :: ['nucleotide']
@entity377 :: (CHEBI:36976,Chemical) :: ['nucleotide']
