1JQ1

POTASSIUM CHANNEL (KCSA) OPEN GATE MODEL

SOLUTION NMR

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NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	CONTINUOUS WAVE EPR	1.0 MG/ML MIXED WITH METHANETHIOSULFONATE SPIN LABEL	THE SAMPLES WERE RECONSTITUTED INTO ASOLECTIN LIPOSOMES AT A 1:400 PROTEIN:LIPID RATIO	20 mM CITRATE PHOSPHATE	7.0	1 atm	150.0

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

NMR Refinement
Method	Details	Software
FOURIER DECONVOLUTION, CONFORMATIONAL GRID SEARCH A CARTESAIN REPRESENTATION MOLECULAR MECHANIC ENERGY MINIMIZATION	THE STRUCTURE ARE BASED ON: 1) TEN PAIRS OF INTER-SUBUNIT DISTANCES FOR THE KCSA INNER HELICAL BUNDLE IN THE CLOSED AND THE OPEN STATES AND 2) THE USE OF THE CRYSTAL STRUCTURE AS THE CHANNEL IN THE CLOSED STATE, AND AS THE REFERENCE STRUCTURE. THE COMPUTER PROGRAM REDCAT SEARCHES (RESTRAINT-DRIVEN CARTESIAN TRANSFORMATION) BASED ON THE EXHAUSTIVE SAMPLING OF RIGID-BODY MOVEMENT IN CARTESIAN SPACE FOR THE TM2 INNER BUNDLE IN THE OPEN STATE WERE ALLOWED TO CONVERGE TO A MINIMAL PENALTY VALUE. THE ENSEMBLE OF THE 50 LOWEST PENALTY CONFORMERS WAS SUBJECTED TO MOLECULAR MECHANIC ENERGY MINIMIZATION. FINAL REFINEMENT WAS PERFORMED ON THE AVERAGE OPEN HELICAL BUNDLE BY ENERGY MINIMIZATION.	Amber

NMR Ensemble Information
Conformer Selection Criteria
Conformers Calculated Total Number
Conformers Submitted Total Number	1
Representative Model	(minimized average structure)

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	refinement	Amber	6.0	D.A.CASE ET.AL.
2	processing	EPR AQUISIT	2.32	BRUKER
3	structure solution	REDCAT		P.SOMPORNPISUT ET.AL.