1W9H

The Structure of a Piwi protein from Archaeoglobus fulgidus.

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1		4.6		PROTEIN SOLUTION AT 10 MG/ML WAS MIXED WITH A SOLUTION CONTAINING 0.1 M SODIUM ACETATE PH 4.6, 0.1 M CADMIUM CHLORIDE, 30% PEG 400, 5 MM DTT. CRYSTALS COULD BE OBTAINED REPRODUCIBLY BY STREAK SEEDING IN TO THE CRYSTALLISATION SOLUTION AFTER A 3 HOUR EQUILIBRATION. CRYSTALS APPEARED AFTER 2-3 DAYS AND GREW AFTER 5 DAYS TO A FINAL SIZE OF 0.1 MM X 0.1 MM X 0.1 MM

Crystal Properties
Matthews coefficient	Solvent content
2.6	52.6

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 69.09	α = 90
b = 137.863	β = 90
c = 51.663	γ = 90

Symmetry
Space Group	P 21 21 2

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	MARRESEARCH		2004-07-07	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	ESRF BEAMLINE ID14-3		ESRF	ID14-3

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	1.95	30	98.6	0.05	18.6	4		143262

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	1.95	2.05	92.8		0.16	6.4	3.2

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	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	MAD	THROUGHOUT	1.95	69.01	34383	1814	98.5	0.194	0.192	0.237	RANDOM	17.41

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]
-0.95			1.83		-0.88

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	40.712
r_dihedral_angle_3_deg	14.933
r_dihedral_angle_4_deg	12.412
r_dihedral_angle_1_deg	6.303
r_scangle_it	4.047
r_scbond_it	2.852
r_mcangle_it	1.8
r_angle_refined_deg	1.635
r_mcbond_it	1.188
r_nbtor_refined	0.314
r_symmetry_vdw_refined	0.273
r_nbd_refined	0.225
r_xyhbond_nbd_refined	0.207
r_symmetry_hbond_refined	0.2
r_chiral_restr	0.124
r_bond_refined_d	0.018
r_gen_planes_refined	0.007
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_mcangle_other
r_scbond_other
r_scangle_other
r_long_range_B_refined
r_long_range_B_other
r_rigid_bond_restr
r_sphericity_free
r_sphericity_bonded

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	3233
Nucleic Acid Atoms
Solvent Atoms	238
Heterogen Atoms	11

Software

Software
Software Name	Purpose
MOSFLM	data reduction
SCALA	data scaling
SnB	phasing
SHARP	phasing
REFMAC	refinement