3O78

The structure of Ca2+ Sensor (Case-12)

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	5.5	293	Reservoir: 100mM Tris HCL (pH 5.5), 100mM (NH4)2SO4, 21% PEG 3350; Protein stock: 7.6 mg/ml Protein, 50mM Tris HCl (pH 7.4), 150mM NaCl; Seed stock solution: 20mM CaCl2, 20% PEG 3350, VAPOR DIFFUSION, HANGING DROP, temperature 293K

Crystal Properties
Matthews coefficient	Solvent content
2.08	40.95

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 46.374	α = 90
b = 101.635	β = 91.45
c = 82.211	γ = 90

Symmetry
Space Group	P 1 21 1

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray	77	IMAGE PLATE	MAR scanner 345 mm plate		2007-08-20	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	ROTATING ANODE	RIGAKU FR-E SUPERBRIGHT	1.54179

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	2.6	100	99.8	0.101	12	3.7		23464			41.9

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	R-Sym I (Observed)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1	2.6	2.71	99.8		0.517	2.8	3.7

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Starting model	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	MOLECULAR REPLACEMENT	THROUGHOUT	PDB ENTRY 3O77	2.6	50.83	22326	22288	1173	99.83	0.24546	0.24183	0.31614	RANDOM	22.432

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]
-1.01		0.06	0.32		0.69

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	35.786
r_dihedral_angle_3_deg	21.239
r_dihedral_angle_4_deg	20.667
r_dihedral_angle_1_deg	8.346
r_angle_refined_deg	1.726
r_symmetry_hbond_refined	0.372
r_symmetry_vdw_refined	0.328
r_nbtor_refined	0.319
r_nbd_refined	0.268
r_xyhbond_nbd_refined	0.205
r_metal_ion_refined	0.178
r_chiral_restr	0.106
r_bond_refined_d	0.015
r_gen_planes_refined	0.006
r_bond_other_d
r_angle_other_deg
r_gen_planes_other
r_nbd_other
r_nbtor_other
r_xyhbond_nbd_other
r_metal_ion_other
r_symmetry_vdw_other
r_symmetry_hbond_other
r_symmetry_metal_ion_refined
r_symmetry_metal_ion_other
r_mcbond_it
r_mcbond_other
r_mcangle_it
r_scbond_it
r_scangle_it
r_rigid_bond_restr
r_sphericity_free
r_sphericity_bonded

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	6338
Nucleic Acid Atoms
Solvent Atoms	77
Heterogen Atoms	8

Software

Software
Software Name	Purpose
MAR345dtb	data collection
MOLREP	phasing
REFMAC	refinement
XDS	data reduction
XSCALE	data scaling