3DLB

Crystal structure of the guide-strand-containing Argonaute protein silencing complex

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	7.5	308	5% PEGMME550, 0.1M KCl, 10mM MgCl2, 50 mM Tris HCl, pH 7.5, VAPOR DIFFUSION, HANGING DROP, temperature 308K

Crystal Properties
Matthews coefficient	Solvent content
2.54	51.59

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 77.846	α = 90
b = 123.399	β = 95.7
c = 84.91	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	CCD	MARMOSAIC 300 mm CCD		2007-02-27	M	MAD

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	APS BEAMLINE 24-ID-C	0.97918, 0.97929	APS	24-ID-C

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	2.7	50		0.06	29.4	4.5		42559

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)
	2.7	2.8	100		0.643	1.72	4.6

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Resolution (High)	Resolution (Low)	Number Reflections (All)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Work	R-Free	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MAD	THROUGHOUT	2.7	30	43847	41328	2188	97.63	0.2543	0.2931	RANDOM	54.033

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]
7.553		-4.161	-2.722		-4.831

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	32.858
r_dihedral_angle_3_deg	19.681
r_dihedral_angle_4_deg	18.399
r_dihedral_angle_1_deg	6.533
r_scangle_it	2.581
r_angle_refined_deg	1.874
r_scbond_it	1.519
r_mcangle_it	0.991
r_mcbond_it	0.557
r_nbtor_refined	0.31
r_nbd_refined	0.224
r_symmetry_vdw_refined	0.215
r_symmetry_hbond_refined	0.171
r_xyhbond_nbd_refined	0.158
r_chiral_restr	0.094
r_bond_refined_d	0.012
r_gen_planes_refined	0.004
r_bond_other_d
r_angle_other_deg
r_gen_planes_other
r_nbd_other
r_nbtor_other
r_xyhbond_nbd_other
r_metal_ion_refined
r_metal_ion_other
r_symmetry_vdw_other
r_symmetry_hbond_other
r_symmetry_metal_ion_refined
r_symmetry_metal_ion_other
r_mcbond_other
r_rigid_bond_restr
r_sphericity_free
r_sphericity_bonded

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	9561
Nucleic Acid Atoms	186
Solvent Atoms	48
Heterogen Atoms

Software

Software
Software Name	Purpose
REFMAC	refinement
HKL-2000	data collection
HKL-2000	data reduction
HKL-2000	data scaling
SOLVE	phasing