4PQV

Crystal structure of an Xrn1-resistant RNA from the 3' untranslated region of a flavivirus (Murray Valley Encephalitis virus)

X-RAY DIFFRACTION

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, SITTING DROP	7.5	293	drop: 1 uL 5 mg/mL RNA in 2.5 mM magnesium chloride, 10 mM HEPES-KOH pH 7.5 (heated to 65 C for 3 minutes, cooled at room temperature, 0.5 mM spermidine added, centrifuged for 10 minutes at 13000 x g) + 2 uL 10% MPD, 40 mM sodium cacodylate, pH 6.0, 12 mM spermine, 80 mM sodium chloride, 20 mM magnesium chloride (Nucleic Acid Mini-Screen kit, Hampton Research), well: 20-35% MPD, crystals appeared within 2-3 days and grew to full size over 1-2 weeks. To obtain derivatized crystals for phasing, 5 uL 4 mM iridium (III) hexammine in RNase-free water was added directly to crystallization drops and well solutions <35% MPD were replaced with 35% MPD. Wells were then re-sealed and allowed to re-equilibrate for at least 2 days, VAPOR DIFFUSION, SITTING DROP, temperature 293K

Crystal Properties
Matthews coefficient	Solvent content
2.94	58.13

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 76.698	α = 90
b = 76.698	β = 90
c = 76.448	γ = 120

Symmetry
Space Group	P 32 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	CMOS	TAURUS-1		2013-09-27	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	ALS BEAMLINE 4.2.2	1.0972	ALS	4.2.2

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	2.45	50.14					9499

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1	2.45

Refinement

Statistics
Diffraction ID	Structure Solution Method	Resolution (High)	Resolution (Low)	Cut-off Sigma (F)	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	SAD	2.463	50.14	1.39	8418	824	85.47	0.2357	0.2303	0.2835	RANDOM

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
f_dihedral_angle_d	14.545
f_angle_d	1.247
f_chiral_restr	0.05
f_plane_restr	0.007
f_bond_d	0.006

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms
Nucleic Acid Atoms	1466
Solvent Atoms	7
Heterogen Atoms	9

Software

Software
Software Name	Purpose
Blu-Ice	data collection
PHENIX	model building
PHENIX	refinement
d*TREK	data reduction
d*TREK	data scaling
PHENIX	phasing

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.