2QND

Crystal Structure of the KH1-KH2 domains from human Fragile X Mental Retardation Protein

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	8	295	50mM Tris-HCl, pH 8.0, 300mM NaCl, 5mM reduced L-Glutathione, VAPOR DIFFUSION, HANGING DROP, temperature 295K

Crystal Properties
Matthews coefficient	Solvent content
2.53	51.36

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 71	α = 90
b = 70.7	β = 107.23
c = 68.16	γ = 90

Symmetry
Space Group	C 1 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	CCD	ADSC QUANTUM 4		2005-11-10	M	MAD

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	NSLS BEAMLINE X6A	0.9788, 0.9793, 0.9184	NSLS	X6A

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	1.9	50	98	0.05	19.6	4.6		24901		-3	29.5

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	1.9	1.97	83.8		0.183	4.8	4.2

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	1.9	24.77	23260	1266	100	0.23003	0.22692	0.28706	RANDOM	39.603

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]
2.96		0.78	-1.78		-0.72

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	35.863
r_dihedral_angle_4_deg	18.626
r_dihedral_angle_3_deg	15.565
r_dihedral_angle_1_deg	6.554
r_mcangle_it	3.199
r_mcbond_it	2.448
r_scangle_it	1.635
r_scbond_it	1.565
r_angle_refined_deg	1.341
r_angle_other_deg	0.899
r_mcbond_other	0.611
r_nbd_refined	0.219
r_symmetry_hbond_refined	0.211
r_symmetry_vdw_other	0.207
r_xyhbond_nbd_refined	0.195
r_nbd_other	0.191
r_nbtor_refined	0.177
r_nbtor_other	0.086
r_chiral_restr	0.08
r_symmetry_vdw_refined	0.071
r_metal_ion_refined	0.062
r_bond_refined_d	0.012
r_gen_planes_refined	0.004
r_bond_other_d	0.001
r_gen_planes_other	0.001

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	2233
Nucleic Acid Atoms
Solvent Atoms	133
Heterogen Atoms	1

Software

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