2IH1

Ion selectivity in a semi-synthetic K+ channel locked in the conductive conformation


X-RAY DIFFRACTION Experimental Data & Validation


X-ray Experimental Help

Crystallization

Crystalization Experiments
pH 5.5
Temperature 293.0
Details Crystals grown in 150 mM KCl were transferred to a solution containing 1 mM KCl + 149 mM NaCl prior to cryoprotection, pH 5.5, VAPOR DIFFUSION, HANGING DROP, temperature 293K, pH 5.50

Crystal Data

Unit Cell
Length (Å) Angle (°)
a = 156.39 α = 90
b = 156.39 β = 90
c = 75.67 γ = 90
Symmetry
Space Group I 4

Diffraction

Diffraction Experiment
ID # Data Collection Temperature
1 100
Diffraction Detector
Detector Diffraction Type Details Collection Date
CCD ADSC QUANTUM 315 -- --
Diffraction Radiation
Monochromator Protocol
-- SINGLE WAVELENGTH
Diffraction Detector Source
Source Type Wavelength List Synchrotron Site Beamline
SYNCHROTRON NSLS BEAMLINE X25 -- NSLS X25

Data Collection

Overall
Resolution (High) Resolution (Low) Percent Possible (Observed) R Merge I (Observed) R Sym I (Observed) Net I Over Average Sigma (I) Redundancy Number Reflections (All) Number Reflections (Observed) Observed Criterion Sigma (F) Observed Criterion Sigma (I) B (Isotropic) From Wilson Plot
2.4 31.23 95.1 -- 0.063 -- 4.1 -- 34294 -- -- 35.9
High Resolution Shell
Resolution (High) Resolution (Low) Percent Possible (All) R Merge I (Observed) R-Sym I (Observed) Mean I Over Sigma (Observed) Redundancy Number Unique Reflections (All)
2.4 2.49 90.7 -- 0.496 2.74 3.9 --

Refinement

Statistics
Structure Solution Method Refinement High Resolution Refinement Low Resolution Cut-off Sigma (I) Cut-off Sigma (F) Number of Reflections (All) Number of Reflections (Observed) Number of Reflections (R-Free) Percent Reflections (Observed) R-Factor (All) R-Factor (Observed) R-Work R-Free R-Free Selection Details
MOLECULAR REPLACEMENT 2.4 31.23 -- 0.0 -- 34294 1710 95.5 -- 0.233 0.233 0.251 RANDOM
High Resolution Shell
Refinement method Shell Resolution (High) Shell Resolution (Low) # of Reflections (Observed) # of Reflections (R-Free) # of Reflections (R-Work) R-Factor (R-Work) R-Factor (R-Free) R-Factor (R-Free Error) Percent Reflections (Observed)
X Ray Diffraction 2.4 2.55 -- 251 5407 0.309 0.321 0.02 94.9
Temperature Factor Modeling
Temperature Factor Value
Isotropic Thermal Model RESTRAINED
Mean Isotropic B 55.8
Anisotropic B[1][1] 6.08
Anisotropic B[1][2] 0.0
Anisotropic B[1][3] 0.0
Anisotropic B[2][2] 6.08
Anisotropic B[2][3] 0.0
Anisotropic B[3][3] -12.16
RMS Deviations
Key Refinement Restraint Deviation
c_dihedral_angle_d 25.8
c_scangle_it 2.69
c_angle_deg 1.7
c_bond_d 0.014
c_mcangle_it 2.29
c_mcbond_it 1.34
c_scbond_it 1.76
c_improper_angle_d 1.65
Coordinate Error
Parameter Value
Luzzati ESD (Observed) 0.34
Luzzati Sigma A (Observed) 0.34
Luzzati Resolution Cutoff (Low) 5.0
Luzzati ESD (R-Free Set) 0.38
Luzzati Sigma A (R-Free Set) 0.39
Number of Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms Numbers
Protein Atoms 4061
Nucleic Acid Atoms 0
Heterogen Atoms 36
Solvent Atoms 49

Software

Software
Software Name Purpose
CNS refinement version: 1.1
PDB_EXTRACT data extraction version: 2.000
CBASS data collection
DENZO data reduction
SCALEPACK data scaling