Correlations between function and dynamics: time scale coincidence for ion translocation and molecular dynamics in the gramicidin channel backbone.


The polypeptide backbone of gramicidin lines the channel lumen, which maintains a single file string of water molecules and the occasional cation. Whether or not local motions of the backbone are important for facilitating cation transport has been the subject of debate. Here it is demonstrated that motions of the backbone occur on the same time scale as… (More)


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