1F6G

POTASSIUM CHANNEL (KCSA) FULL-LENGTH FOLD

SOLUTION NMR

NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	Power Saturation Experiments in 21% O2 or 10 mM NiEdda	50-100 uM KcsA, PBS pH 7.2, reconstituted into asolectin vesicles at a 1:500 protein:lipid ratio (molar)	100% H2O	50-100 mM	7.2	ambient	293
2	Dipolar couplings derived from underlabeled samples

NMR Spectrometer Information
Spectrometer	Manufacturer	Model	Field Strength
1	Bruker	EMX	3400

NMR Refinement
Method	Details	Software
simulated annealing	structures are based on a total of 438 restraints, with 84 intra-subunit distance constraints per subunit and 15 inter-subunit constraints	EPR Aquisit

NMR Ensemble Information
Conformer Selection Criteria	structures with the lowest energy
Conformers Calculated Total Number	32
Conformers Submitted Total Number	8
Representative Model	4 (closest to the average)

Additional NMR Experimental Information
Details	This structure was determined using secondary structure assignments from frequency analysis of solvent accessibility data and tertiary and quaternary structural information from spin-spin dipolar couplings

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	collection	EPR Aquisit	2.32	Bruker Instruments
2	structure solution	Discover	3	MSI
3	refinement	Discover	3	MSI

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.