5R4D

Crystal Structure of gamma-Chymotrypsin at pH 9, cryo temperature

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, SITTING DROP		297	45% saturated ammonium sulfate, 0.75% saturated cetyltrimethylammonium bromide, 100 mM sodium iodide; sodium malonate

Crystal Properties
Matthews coefficient	Solvent content
2.17	43.25

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 69.067	α = 90
b = 69.067	β = 90
c = 95.803	γ = 90

Symmetry
Space Group	P 42 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	MARMOSAIC 300 mm CCD		2010-07-21	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	APS BEAMLINE 23-ID-B	0.9	APS	23-ID-B

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	1.05	50	99.2	0.063	12.3	16.7		107355

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	1.05	1.09	93.8		0.766		5.7

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	FOURIER SYNTHESIS	THROUGHOUT	1GCT	1.05	56.03	101897	5388	99.1	0.123	0.122	0.14	RANDOM	14.24

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]
0.41			0.41		-0.83

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	36.459
r_sphericity_free	34.819
r_sphericity_bonded	12.707
r_dihedral_angle_3_deg	11.716
r_dihedral_angle_4_deg	7.39
r_dihedral_angle_1_deg	7.025
r_rigid_bond_restr	2.306
r_angle_refined_deg	1.648
r_angle_other_deg	1.094
r_chiral_restr	0.098
r_bond_refined_d	0.013
r_gen_planes_refined	0.009
r_bond_other_d	0.003
r_gen_planes_other	0.003
r_nbd_refined
r_nbd_other
r_nbtor_refined
r_nbtor_other
r_xyhbond_nbd_refined
r_xyhbond_nbd_other
r_metal_ion_refined
r_metal_ion_other
r_symmetry_vdw_refined
r_symmetry_vdw_other
r_symmetry_hbond_refined
r_symmetry_hbond_other
r_symmetry_metal_ion_refined
r_symmetry_metal_ion_other
r_mcbond_it
r_mcbond_other
r_mcangle_it
r_mcangle_other
r_scbond_it
r_scbond_other
r_scangle_it
r_scangle_other
r_long_range_B_refined
r_long_range_B_other

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	1833
Nucleic Acid Atoms
Solvent Atoms	390
Heterogen Atoms	17

Software

Software
Software Name	Purpose
REFMAC	refinement
HKL-2000	data reduction
SCALEPACK	data scaling
PDB_EXTRACT	data extraction
PHENIX	phasing