2K1E

NMR studies of a channel protein without membranes: structure and dynamics of water-solubilized KcsA

SOLUTION NMR

NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	2D 1H-15N HSQC	0.2 mM [U-15N] WSK3_15N, 55 M [U-2H] D2O, 0.2 mM DSS	95% H2O/5% D2O	no salt	4.5	ambient	293
2	3D CBCA(CO)NH	0.2 mM [U-15N] WSK3_15N, 55 M [U-2H] D2O, 0.2 mM DSS	95% H2O/5% D2O	no salt	4.5	ambient	293
3	3D HNCO	0.2 mM [U-15N] WSK3_15N, 55 M [U-2H] D2O, 0.2 mM DSS	95% H2O/5% D2O	no salt	4.5	ambient	293
4	3D HNCA	0.2 mM [U-15N] WSK3_15N, 55 M [U-2H] D2O, 0.2 mM DSS	95% H2O/5% D2O	no salt	4.5	ambient	293
5	3D HNCACB	0.2 mM [U-15N] WSK3_15N, 55 M [U-2H] D2O, 0.2 mM DSS	95% H2O/5% D2O	no salt	4.5	ambient	293
6	3D HCCH-TOCSY	0.2 mM [U-15N] WSK3_15N, 55 M [U-2H] D2O, 0.2 mM DSS	95% H2O/5% D2O	no salt	4.5	ambient	293
7	T1, T2, hetNOE	0.2 mM [U-15N] WSK3_15N, 55 M [U-2H] D2O, 0.2 mM DSS	95% H2O/5% D2O	no salt	4.5	ambient	293
8	R2 dispersion	0.2 mM [U-15N] WSK3_15N, 55 M [U-2H] D2O, 0.2 mM DSS	95% H2O/5% D2O	no salt	4.5	ambient	293
9	diffusion measurement	0.2 mM [U-15N] WSK3_15N, 55 M [U-2H] D2O, 0.2 mM DSS	95% H2O/5% D2O	no salt	4.5	ambient	293

NMR Spectrometer Information
Spectrometer	Manufacturer	Model	Field Strength
1	Bruker	AVANCE	800
2	Bruker	AVANCE	700
3	Bruker	AVANCE	600

NMR Refinement
Method	Details	Software
simulated annealing	The structure is further refined with energy minimization in water box without NMR constraints.	CYANA

NMR Ensemble Information
Conformer Selection Criteria	structures with the lowest energy
Conformers Calculated Total Number	100
Conformers Submitted Total Number	20
Representative Model	1 (lowest energy)

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	structure solution	CYANA	2.1	Guntert, Mumenthaler and Wuthrich
2	structure solution	X-PLOR NIH	2.15.0	Schwieters, Kuszewski, Tjandra and Clore
3	collection	TopSpin	1.3	Bruker Biospin
4	data analysis	Sparky	3.110	Goddard
5	processing	NMRPipe	2.4	Delaglio, Grzesiek, Vuister, Zhu, Pfeifer and Bax
6	data analysis	NMRPipe	2.4	Delaglio, Grzesiek, Vuister, Zhu, Pfeifer and Bax
7	refinement	XPLOR_NIH	2.15.0	Schwieters, Kuszewski, Tjandra and Clore

RCSB PDB Core Operations are funded by the National Science Foundation (DBI-1832184), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM133198.