Protein dynamics detected in a membrane-embedded potassium channel using two-dimensional solid-state NMR spectroscopy.
We report longitudinal (15)N relaxation rates derived from two-dimensional ((15)N, (13)C) chemical shift correlation experiments obtained under magic angle spinning for the potassium channel KcsA-Kv1.3 reconstituted in multilamellar vesicles. Thus, we demonstrate that solid-state NMR can be used to probe residue-specific backbone dynamics in a membrane-embedded protein. Enhanced backbone mobility was detected for two glycine residues within the selectivity filter that are highly conserved in potassium channels and that are of core relevance to the filter structure and ion selectivity.
Ader
Christian
C
Bijvoet Center for Biomolecular Research, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands.
Pongs
Olaf
O
Becker
Stefan
S
Baldus
Marc
M
D001426:Bacterial Proteins / Q000737:chemistry*; D002462:Cell Membrane / Q000737:chemistry*; D019906:Nuclear Magnetic Resonance, Biomolecular; D015221:Potassium Channels / Q000737:chemistry*; D017434:Protein Structure, Tertiary / Q000502:physiology
D001426:Bacterial Proteins; D015221:Potassium Channels; C107790:prokaryotic potassium channel