1TZY

Crystal Structure of the Core-Histone Octamer to 1.90 Angstrom Resolution

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	MICRODIALYSIS	6.7	277	2.0M KCL, 1.35M PHOSPHATE, pH 6.7, MICRODIALYSIS, temperature 277K

Crystal Properties
Matthews coefficient	Solvent content
3.45	64.4

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 158.351	α = 90
b = 158.351	β = 90
c = 103.576	γ = 120

Symmetry
Space Group	P 65

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	Plane Mirror, vertically focussing	2002-12-20	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	SRS BEAMLINE PX14.2	0.98	SRS	PX14.2

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	14.96	99.86	0.089	25.7	6.3		109956	4.1	25.7

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
	1.9	1.948	99.5

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Resolution (High)	Resolution (Low)	Cut-off Sigma (F)	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	MOLECULAR REPLACEMENT	THROUGHOUT	1.9	14.96	1	109956	5809	99.86	0.18984	0.18844	0.18667	0.22152	RANDOM	40.325

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
r_scangle_it	6.186
r_dihedral_angle_1_deg	5.889
r_scbond_it	3.808
r_mcangle_it	2.584
r_angle_refined_deg	1.923
r_mcbond_it	1.409
r_angle_other_deg	1.062
r_symmetry_vdw_other	0.323
r_nbd_other	0.263
r_nbd_refined	0.247
r_symmetry_hbond_refined	0.197
r_chiral_restr	0.194
r_xyhbond_nbd_refined	0.19
r_symmetry_vdw_refined	0.163
r_nbtor_other	0.091
r_bond_refined_d	0.024
r_gen_planes_refined	0.009
r_bond_other_d	0.002
r_gen_planes_other	0.002

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	5965
Nucleic Acid Atoms
Solvent Atoms	612
Heterogen Atoms	48

Software

Software
Software Name	Purpose
REFMAC	refinement
PXGEN	data reduction
SCALEPACK	data scaling
AMoRE	phasing