4HMI

Crystal structure of Staphylococcal nuclease variant Delta+PHS V99K at cryogenic temperature

X-RAY DIFFRACTION

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	8	277	20% MPD, 25 mM potassium phosphate, with calcium chloride and pdTp added to protein in a 3:2:1 ratio, pH 8, VAPOR DIFFUSION, HANGING DROP, temperature 277K

Crystal Properties
Matthews coefficient	Solvent content
2.24	45.12

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 31.161	α = 90
b = 61.124	β = 92.95
c = 38.115	γ = 90

Symmetry
Space Group	P 1 21 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	FLAT PANEL	PHOTON 100	Helios MX	2012-03-17	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SEALED TUBE	OTHER	1.54

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	1.75	19.22	99.8	0.0306	19.14	6.86	14469	14469			34.2

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	1.75	1.85	100		0.243	3.7	3.5	2222

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 3BDC	1.75	19.22	14454	14454	724	99.93	0.1899	0.1899	0.1883	0.2209	RANDOM	28.4398

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]
0.01		-0.07	0.06		-0.08

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	34.958
r_dihedral_angle_3_deg	17.707
r_dihedral_angle_4_deg	12.128
r_dihedral_angle_1_deg	6.35
r_scangle_it	4.912
r_scbond_it	3.469
r_mcangle_it	1.951
r_angle_refined_deg	1.853
r_mcbond_it	1.276
r_chiral_restr	0.155

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	34.958
r_dihedral_angle_3_deg	17.707
r_dihedral_angle_4_deg	12.128
r_dihedral_angle_1_deg	6.35
r_scangle_it	4.912
r_scbond_it	3.469
r_mcangle_it	1.951
r_angle_refined_deg	1.853
r_mcbond_it	1.276
r_chiral_restr	0.155
r_bond_refined_d	0.019
r_gen_planes_refined	0.012

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	1044
Nucleic Acid Atoms
Solvent Atoms	90
Heterogen Atoms	26

Software

Software
Software Name	Purpose
PHASER	phasing
REFMAC	refinement
PDB_EXTRACT	data extraction
APEX	data collection
APEX	data reduction

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM133198.