Experiment: 8CTV

Crystal structure of a K+ selective NaK mutant (NaK2K) -Tl+ complex

X-RAY DIFFRACTION

Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	Other		room temperature NaK2K structure

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, SITTING DROP		293	NaK2K protein was mixed with 50mM MES pH 6.5/100mM potassium citrate/200mM TlNO3/56%-68% MPD while 50mM MES pH 6.5/100mM potassium citrate/200mM KNO3/56%-68% MPD was used for the reservoir. Crystal is transferred to 100mM TlNO3/50mM MES (pH 6.0 or 6.5)/60%-70% MPD

Crystal Properties
Matthews coefficient	Solvent content
2.58	52.28

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 69.123	α = 90
b = 69.123	β = 90
c = 91.847	γ = 90

Symmetry
Space Group	I 4

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray	289	PIXEL	DECTRIS EIGER X 16M		2019-07-08	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	APS BEAMLINE 24-ID-C	0.9781	APS	24-ID-C

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (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
1	2.1	50	99.8	0.115	32.272	21.3		22504			20.28

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	R-Sym I (Observed)	CC (Half)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1	2.1	2.14	99.4		0.741	0.731	2.904	13.9

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Starting model	Resolution (High)	Resolution (Low)	Cut-off Sigma (F)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Factor (Observed)	R-Work (Depositor)	R-Work (DCC)	R-Free (Depositor)	R-Free (DCC)	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	FREE R-VALUE	room temperature NaK2K structure	2.1	48.88	1.73	22500	2296	90.54	0.1692	0.1678	0.1812	0.1811	0.1971	37.42

Temperature Factor Modeling
Anisotropic B[1][1]	Anisotropic B[1][2]	Anisotropic B[1][3]	Anisotropic B[2][2]	Anisotropic B[2][3]	Anisotropic B[3][3]

RMS Deviations
Key	Refinement Restraint Deviation
f_dihedral_angle_d	19.842
f_angle_d	0.8419
f_chiral_restr	0.0454
f_plane_restr	0.0059
f_bond_d	0.0056

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	1480
Nucleic Acid Atoms
Solvent Atoms	32
Heterogen Atoms	66

Software

Software
Software Name	Purpose
PHENIX	refinement
HKL-2000	data reduction
HKL-2000	data scaling
PHENIX	phasing