2QVK

The second Ca2+-binding domain of the Na+-Ca2+ exchanger is essential for regulation: crystal structures and mutational analysis

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	4.9	293	11% (w/v) PEG-3350, 0.1 M Na acetate (pH 4.9), CBD2 at 15 mg/ml, VAPOR DIFFUSION, HANGING DROP, temperature 293K

Crystal Properties
Matthews coefficient	Solvent content
	24.96

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 82.336	α = 90
b = 76.491	β = 90
c = 22.538	γ = 90

Symmetry
Space Group	P 21 21 2

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray	100	CCD	ADSC QUANTUM 315		2007-02-10	M	MAD
2	1	x-ray	100					M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	ALS BEAMLINE 8.2.1	1.0, 0.9795, 0.98, 0.9718	ALS	8.2.1
2

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (Observed)	R Merge 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	1.451	56.08		0.038	26.4	99.9	26079	23794

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	R Merge I (Observed)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
	1.451	1.5	99.4		0.447	2.85	5.1

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Resolution (High)	Resolution (Low)	Number Reflections (All)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Factor (Observed)	R-Work	R-Free	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MAD	THROUGHOUT	1.451	56.08	26079	23794	1278	95.83	0.16258	0.16105	0.19157	RANDOM	11.963

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]
-0.18			0.05		0.13

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	34.591
r_dihedral_angle_4_deg	16.579
r_dihedral_angle_3_deg	12.053
r_dihedral_angle_1_deg	6.943
r_sphericity_free	5.235
r_scangle_it	4.427
r_scbond_it	3.04
r_sphericity_bonded	2.635
r_mcangle_it	2.01
r_mcbond_it	1.668
r_rigid_bond_restr	1.543
r_angle_refined_deg	1.326
r_angle_other_deg	0.783
r_mcbond_other	0.459
r_symmetry_vdw_refined	0.286
r_symmetry_vdw_other	0.219
r_nbd_other	0.186
r_nbd_refined	0.184
r_nbtor_refined	0.171
r_xyhbond_nbd_refined	0.161
r_chiral_restr	0.091
r_symmetry_hbond_refined	0.087
r_nbtor_other	0.081
r_bond_refined_d	0.011
r_bond_other_d	0.007
r_gen_planes_refined	0.005
r_gen_planes_other	0.001
r_xyhbond_nbd_other
r_metal_ion_refined
r_metal_ion_other
r_symmetry_hbond_other
r_symmetry_metal_ion_refined
r_symmetry_metal_ion_other

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	991
Nucleic Acid Atoms
Solvent Atoms	104
Heterogen Atoms

Software

Software
Software Name	Purpose
HKL-2000	data collection
SHELXS	phasing
REFMAC	refinement
DENZO	data reduction
SCALEPACK	data scaling