Experiment: 1BIQ

RIBONUCLEOSIDE-DIPHOSPHATE REDUCTASE 1 BETA CHAIN MUTANT E238A

X-RAY DIFFRACTION

Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	1XIK	DIFERROUS FORM OF R2 PROTEIN, PDB ENTRY 1XIK

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1		6		pH 6.0

Crystal Properties
Matthews coefficient	Solvent content
2.1	34

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 74.053	α = 90
b = 83.78	β = 90
c = 113.953	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	IMAGE PLATE	MARRESEARCH	BENT QUARTZ MIRROR	1996-05-18	M

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	SRS BEAMLINE PX7.2		SRS	PX7.2

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (Observed)	R Merge I (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	2.05	27	98.3	0.081	0.081	16.4	3.7		161734			36.3

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Starting model	Resolution (High)	Resolution (Low)	Number Reflections (All)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Factor (All)	R-Factor (Observed)	R-Work (Depositor)	R-Free (Depositor)	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	DIFFERENCE FOURIER WITH INITIAL REFINEMENT	R FREE THROUGHOUT	DIFERROUS FORM OF R2 PROTEIN, PDB ENTRY 1XIK	2.05	25	43712	43712	1761	98	0.192	0.192	0.191	0.26	RANDOM

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]

RMS Deviations
Key	Refinement Restraint Deviation
t_dihedral_angle_d	16.8
t_angle_deg	2.1
t_it	1.666
t_nbd	0.03
t_bond_d	0.014
t_gen_planes	0.012
t_trig_c_planes	0.008
t_incorr_chiral_ct
t_pseud_angle

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	5573
Nucleic Acid Atoms
Solvent Atoms	325
Heterogen Atoms	23

Software

Software
Software Name	Purpose
TNT/CCP4	model building
TNT	refinement
DENZO	data reduction
SCALEPACK	data scaling
CCP4	data scaling
TNT	phasing
CCP4	phasing