3RSD

STRUCTURE OF THE D121N VARIANT OF RIBONUCLEASE A

X-RAY DIFFRACTION

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	batch method	5.2		LYOPHILIZED D121N RNASE A WAS DISSOLVED IN UNBUFFERED WATER TO A CONCENTRATION OF 60MG/ ML. CRYSTALLIZATION WAS PERFORMED IN SMALL SILICONIZED TUBES USING THE BATCH METHOD. A SOLUTION (25UL) OF THE ENZYME WAS MIXED WITH AN EQUAL VOLUME OF 95% (V/V) 2-METHYL-2,4-PENTANEDIOL IN 0.10 M MES BUFFER, PH 5.2. CRYSTALS APPEARED WITHIN SEVERAL MONTHS., batch method

Crystal Properties
Matthews coefficient	Solvent content
2.19	60

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 30.52	α = 90
b = 38.4	β = 105.7
c = 53.31	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	277	AREA DETECTOR	SIEMENS	LONG MIRRORS	1995-08-28	M

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	ROTATING ANODE	RIGAKU RUH2R

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (Observed)	R Sym 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	1.6	30	88	0.019	31	1.8		15756		0.33

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	R-Sym I (Observed)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
	1.6	1.7	75		0.057

Refinement

Statistics
Diffraction ID	Structure Solution Method	Starting model	Resolution (High)	Resolution (Low)	Number Reflections (All)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Factor (All)	R-Work	R-Free	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	PDB ENTRY 1RPH	1.6	30	15756	15756		88	0.177

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]

RMS Deviations
Key	Refinement Restraint Deviation
t_dihedral_angle_d	17.1
t_angle_deg	2.15
t_it	1
t_nbd	0.026
t_bond_d	0.011
t_gen_planes	0.009
t_trig_c_planes	0.005
t_incorr_chiral_ct
t_pseud_angle

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	956
Nucleic Acid Atoms
Solvent Atoms	100
Heterogen Atoms

Software

Software
Software Name	Purpose
XDS	data scaling
XCALIBRE	data reduction
AMoRE	phasing
TNT	refinement
XDS	data reduction
XCALIBRE	data scaling

RCSB PDB Core Operations are funded by the National Science Foundation (DBI-1832184), 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.