1HK8

STRUCTURAL BASIS FOR ALLOSTERIC SUBSTRATE SPECIFICITY REGULATION IN CLASS III RIBONUCLEOTIDE REDUCTASES: NRDD IN COMPLEX WITH DGTP

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1		7.5		30% PEG 400, 02M MGCL2, 0.1M HEPES PH 7.5, 7MM DTT

Crystal Properties
Matthews coefficient	Solvent content
4.5	72.4

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 98.163	α = 90
b = 98.163	β = 90
c = 246.131	γ = 90

Symmetry
Space Group	P 43 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	IMAGE PLATE	MARRESEARCH	BENT MIRROR	1999-05-15	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	MAX II BEAMLINE I711		MAX II	I711

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	2.43	37.8	95.6	0.096	15.3	3.7		44361

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	2.43	2.49	94.1		0.274	3.8

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-Work	R-Free	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	THROUGHOUT	PDB ENTRY 1B8B	2.45	20.08	39943	1742	95.7	0.204	0.246	RANDOM	41.49

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]
-0.04			-0.04		0.09

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_1_deg	6.203
r_mcangle_it	3.173
r_scangle_it	3.136
r_scbond_it	2.048
r_mcbond_it	1.983
r_angle_refined_deg	1.397
r_angle_other_deg	0.818
r_symmetry_vdw_other	0.268
r_symmetry_vdw_refined	0.258
r_nbd_other	0.219
r_symmetry_hbond_refined	0.216
r_xyhbond_nbd_refined	0.196
r_nbd_refined	0.186
r_nbtor_other	0.085
r_chiral_restr	0.077
r_metal_ion_refined	0.015
r_bond_refined_d	0.011
r_gen_planes_refined	0.005
r_gen_planes_other	0.003
r_bond_other_d	0.002
r_dihedral_angle_2_deg
r_dihedral_angle_3_deg
r_dihedral_angle_4_deg
r_nbtor_refined
r_xyhbond_nbd_other
r_metal_ion_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	4411
Nucleic Acid Atoms
Solvent Atoms	228
Heterogen Atoms	64

Software

Software
Software Name	Purpose
REFMAC	refinement
DENZO	data reduction
SCALEPACK	data scaling
CNS	phasing