1OBC

LEUCYL-TRNA SYNTHETASE FROM THERMUS THERMOPHILUS COMPLEXED WITH A POST-TRANSFER EDITING SUBSTRATE ANALOGUE

X-RAY DIFFRACTION

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Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	1H3N	PDB ENTRY 1H3N

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1		6.5		PROTEIN 10 MG/ML IN 50MM BIS-TRIS PROPANE BUFFER PH 6.0-6.5 2MM DTT, 20MM MGCL2, 1MM NAN3, 18% AMMONIUM SULPHATE EQUILBRIATED AGAINST 30-38% AMMONIUM SULPHATE IN 100MM BIS-TRIS PROPANE BUFFER PH 6.0-6.5. SEE REFERENCE 2

Crystal Properties
Matthews coefficient	Solvent content
3.5	64

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 101.896	α = 90
b = 154.81	β = 90
c = 175.118	γ = 90

Symmetry
Space Group	C 2 2 21

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	CCD		2002-12-09	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	ESRF BEAMLINE ID14-2		ESRF	ID14-2

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	25	96.2	0.088	6.3	2.3		77419			18.8

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	2.1	2.15	84.2		0.35	2	1.8

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	MOLECULAR REPLACEMENT	THROUGHOUT	PDB ENTRY 1H3N	2.1	24.65	77390	3844	95.8	0.193	0.193	0.225	RANDOM	30.8

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]
-1.71			6.78		-5.07

RMS Deviations
Key	Refinement Restraint Deviation
c_dihedral_angle_d	22.3
c_scangle_it	5.04
c_scbond_it	3.56
c_mcangle_it	2.42
c_mcbond_it	2
c_angle_deg	1.2
c_improper_angle_d	0.86
c_bond_d	0.006
c_bond_d_na
c_bond_d_prot
c_angle_d
c_angle_d_na
c_angle_d_prot
c_angle_deg_na
c_angle_deg_prot
c_dihedral_angle_d_na
c_dihedral_angle_d_prot
c_improper_angle_d_na
c_improper_angle_d_prot

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	6623
Nucleic Acid Atoms
Solvent Atoms	487
Heterogen Atoms	59

Software

Software
Software Name	Purpose
CNS	refinement
MOSFLM	data reduction
SCALA	data scaling
MOLREP	phasing