5JCF

Crystal structure of chicken MDA5 with 5'p 10-mer dsRNA and ADP-Mg2+ at 2.6 A resolution (orthorhombic form).

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, SITTING DROP	7	293	Directly after size exclusion chromatography chMDA5 delta CARD-Q was mixed with 10 bp dsRNA in a 1:1 molar ratio and incubated for 30 minutes on ice. The complex was concentrated to around 10 mg/ml and 2 mM AMPPNP (adenosine 5 prime -(beta,gamma-imido)triphosphate lithium salt hydrate ) was added. Sample and reservoir buffer (0.025 M Bis-Tris pH 6.5, 0.075 M succinic acid pH 7.0, 12-14 % PEG 3350, 2 % sucrose) were mixed in a 2:1 ratio. Three hours after setup, cover glasses with drops were transferred from a reservoir containing 12-14 % PEG 3350 to one containing 8 % PEG 3350. Crystals grew in one week at 20 C and were harvested in cryo-protectant solution (0.025 M Bis-Tris pH 6.5, 0.075 M succinic acid pH 7.0, 25% 3350, 10% ethylene glycol) before flash freezing with liquid nitrogen.

Crystal Properties
Matthews coefficient	Solvent content
2.66	53.78

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 101.92	α = 90
b = 132.47	β = 90
c = 139.04	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	PIXEL	DECTRIS PILATUS3 6M		2014-02-10	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	ESRF BEAMLINE ID29	0.9763	ESRF	ID29

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	2.6	50	98.2	0.096	10.3	5.06		57525

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	2.6	2.69	99.2		0.992	1.87	5.21

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Starting model	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	4GL2	2.6	50	54624	2901	98.22	0.2784	0.27663	0.31231	RANDOM	65.634

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]
-1.24			5.99		-4.75

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	32.861
r_dihedral_angle_3_deg	15.562
r_dihedral_angle_4_deg	12.63
r_dihedral_angle_1_deg	5.582
r_long_range_B_refined	2.277
r_long_range_B_other	2.23
r_angle_refined_deg	1.055
r_angle_other_deg	0.901
r_mcangle_it	0.592
r_mcangle_other	0.592
r_scangle_other	0.477
r_mcbond_it	0.322
r_mcbond_other	0.322
r_scbond_it	0.259
r_scbond_other	0.259
r_chiral_restr	0.06
r_bond_refined_d	0.007
r_gen_planes_refined	0.003
r_bond_other_d	0.002
r_gen_planes_other	0.001
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_scangle_it
r_rigid_bond_restr
r_sphericity_free
r_sphericity_bonded

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	10771
Nucleic Acid Atoms	873
Solvent Atoms	168
Heterogen Atoms	58

Software

Software
Software Name	Purpose
REFMAC	refinement
XDS	data reduction
XSCALE	data scaling
PHASER	phasing