1CYY

CRYSTAL STRUCTURE OF THE 30 KDA FRAGMENT OF E. COLI DNA TOPOISOMERASE I. HEXAGONAL FORM

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	7.5	296	2M AMMONIUM SULFATE, 100MM HEPES PH 7.5, VAPOR DIFFUSION, HANGING DROP, temperature 296K

Crystal Properties
Matthews coefficient	Solvent content
3.69	66.63

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 113.85	α = 90
b = 113.85	β = 90
c = 233.87	γ = 120

Symmetry
Space Group	P 61 2 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		1998-10-01	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	APS BEAMLINE 5ID-B		APS	5ID-B

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	2.15	29	91.7	0.048	11.5	5.7	259275	45125			39.8

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	2.15	2.21	85.8		0.261		3.8

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Resolution (High)	Resolution (Low)	Cut-off Sigma (F)	Number Reflections (All)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Factor (All)	R-Factor (Observed)	R-Work	R-Free	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION		THROUGHOUT	2.15	14.97	2	44947	43571	2166	88.3	0.234	0.234	0.229	0.282	RANDOM	41.6

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]
0.93	4.37		0.93		-1.86

RMS Deviations
Key	Refinement Restraint Deviation
c_dihedral_angle_d	23.7
c_scangle_it	2
c_mcangle_it	1.89
c_angle_deg	1.4
c_scbond_it	1.16
c_mcbond_it	1.09
c_improper_angle_d	0.88
c_bond_d	0.008
c_bond_d_na
c_bond_d_prot
c_angle_d
c_angle_d_na
c_angle_d_prot
c_angle_deg_na
c_angle_deg_prot
c_dihedral_angle_d_na
c_dihedral_angle_d_prot
c_improper_angle_d_na
c_improper_angle_d_prot

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	3939
Nucleic Acid Atoms
Solvent Atoms	380
Heterogen Atoms	1

Software

Software
Software Name	Purpose
CNS	refinement
REFMAC	refinement
X-PLOR	refinement
AMoRE	phasing
DENZO	data reduction
CCP4	data scaling