3ENJ

Structure of Pig Heart Citrate Synthase at 1.78 A resolution

X-RAY DIFFRACTION

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Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	1CTS	PDB ENTRY 1CTS

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1		8.2	295	25% PEG 3350 in H2O in the presence of cystamine HCl, aspartame, benzamidine HCl and Tris-HCl buffer, pH 8.2, VAPOR DIFFUSION, SITTING DROP, temperature 295K

Crystal Properties
Matthews coefficient	Solvent content
2.95	58.27

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 76.34	α = 90
b = 76.34	β = 90
c = 198.15	γ = 90

Symmetry
Space Group	P 41 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		2007-07-10	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	SSRL BEAMLINE BL7-1		SSRL	BL7-1

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	1.72	41.56	89.2	0.072	7.3	6.35		56320			32.2

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)
	1.72	1.78	100		0.646	1.4	6.07

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Starting model	Resolution (High)	Resolution (Low)	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	DIRECT PLACEMENT IN SAME UNIT CELL	THROUGHOUT	PDB ENTRY 1CTS	1.78	41.56	49141	2627	90.6	0.181	0.179	0.222	RANDOM	50.87

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]
2.21			2.21		-4.43

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	39.567
r_dihedral_angle_4_deg	21.261
r_dihedral_angle_3_deg	17.653
r_scangle_it	7.705
r_dihedral_angle_1_deg	6.186
r_scbond_it	5.357
r_mcangle_it	4.619
r_mcbond_it	2.916
r_angle_refined_deg	1.495
r_angle_other_deg	0.781
r_mcbond_other	0.458
r_symmetry_vdw_other	0.29
r_symmetry_hbond_refined	0.209
r_symmetry_vdw_refined	0.169
r_symmetry_hbond_other	0.153
r_xyhbond_nbd_refined	0.136
r_chiral_restr	0.091
r_nbd_other	0.08
r_xyhbond_nbd_other	0.069
r_nbd_refined	0.032
r_bond_refined_d	0.011
r_gen_planes_refined	0.009
r_nbtor_refined	0.006
r_bond_other_d	0.001
r_gen_planes_other	0.001
r_nbtor_other
r_metal_ion_refined
r_metal_ion_other
r_symmetry_metal_ion_refined
r_symmetry_metal_ion_other
r_rigid_bond_restr
r_sphericity_free
r_sphericity_bonded

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	7100
Nucleic Acid Atoms
Solvent Atoms	305
Heterogen Atoms	6

Software

Software
Software Name	Purpose
REFMAC	refinement
CNS	refinement
ADSC	data collection
d*TREK	data reduction
d*TREK	data scaling