4KXH

The X-ray crystal structure of a dimeric variant of human pancreatic ribonuclease

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	7	293	20% PEG 8000, 0.1M ammonium sulphate, pH 7.0, VAPOR DIFFUSION, HANGING DROP, temperature 293K

Crystal Properties
Matthews coefficient	Solvent content
3.04	59.6

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 71.506	α = 90
b = 74.319	β = 90
c = 128.533	γ = 90

Symmetry
Space Group	P 21 21 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	MAR CCD 165 mm		2005-10-11	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	ELETTRA BEAMLINE 5.2R	1.00	ELETTRA	5.2R

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (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	2.7	20	100		6		19485	1	2

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	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	2.7	19.82	18448	992	99.51	0.20074	0.1984	0.24587	RANDOM	26.799

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]
0.3			0.13		-0.43

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	31.41
r_dihedral_angle_4_deg	19.19
r_dihedral_angle_3_deg	13.815
r_dihedral_angle_1_deg	6.291
r_angle_refined_deg	1.675
r_angle_other_deg	1.292
r_chiral_restr	0.087
r_bond_refined_d	0.014
r_gen_planes_refined	0.009
r_bond_other_d	0.007
r_gen_planes_other	0.006
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_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	3832
Nucleic Acid Atoms
Solvent Atoms	211
Heterogen Atoms	69

Software

Software
Software Name	Purpose
CCP4	refinement
PHASER	phasing
REFMAC	refinement
HKL-2000	data reduction
HKL-2000	data scaling