3D5I

Crystal structure of ribonuclease Sa2 with exo-2',3'-cyclophosphorotioate

X-RAY DIFFRACTION

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Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	1PY3	PDB entry 1py3

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	7.2	298	ammonium sulfate, phosphate buffer, pH 7.2, VAPOR DIFFUSION, HANGING DROP, temperature 298.0K

Crystal Properties
Matthews coefficient	Solvent content
2.89	57.5

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 101.221	α = 90
b = 66.775	β = 100.8
c = 57.07	γ = 90

Symmetry
Space Group	C 1 2 1

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray	100	AREA DETECTOR	MARRESEARCH	mirrors	2001-11-15	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	EMBL/DESY, HAMBURG BEAMLINE X31	1.1	EMBL/DESY, HAMBURG	X31

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	2.2	20	90.2	0.055	18	3.2	19754	19754	2	2	38.5

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	2.2	2.257	65.4		0.212	4.7	2.9	579

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 (All)	R-Factor (Observed)	R-Work	R-Free	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	THROUGHOUT	PDB entry 1py3	2.2	19.94	19754	16896	913	93.24	0.2103	0.2103	0.20756	0.26237	RANDOM	19.761

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]
-1.07		-0.04	2.56		-1.51

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	30.865
r_dihedral_angle_4_deg	25.711
r_dihedral_angle_3_deg	16.304
r_dihedral_angle_1_deg	6.623
r_scangle_it	2.434
r_angle_other_deg	1.707
r_scbond_it	1.607
r_angle_refined_deg	1.555
r_mcangle_it	0.953
r_mcbond_it	0.805
r_symmetry_vdw_other	0.239
r_nbd_other	0.219
r_nbd_refined	0.207
r_xyhbond_nbd_refined	0.193
r_nbtor_refined	0.181
r_symmetry_hbond_refined	0.179
r_symmetry_vdw_refined	0.15
r_chiral_restr	0.144
r_mcbond_other	0.13
r_nbtor_other	0.088
r_bond_refined_d	0.014
r_gen_planes_refined	0.005
r_bond_other_d	0.002
r_gen_planes_other	0.001

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	2233
Nucleic Acid Atoms
Solvent Atoms	169
Heterogen Atoms	38

Software

Software
Software Name	Purpose
REFMAC	refinement
DENZO	data reduction
SCALEPACK	data scaling
MOLREP	phasing