Experiment: 3QBA

Reintroducing Electrostatics into Macromolecular Crystallographic Refinement: Z-DNA (X-ray)

X-RAY DIFFRACTION - NEUTRON DIFFRACTION

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION	5.6	293	0.01M Magnesium Acetate 0.05M MES pH 5.6 2.5M Ammonium Sulfate, VAPOR DIFFUSION, temperature 293K

Crystal Properties
Matthews coefficient	Solvent content
1.76	30.3

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 17.9	α = 90
b = 30.59	β = 90
c = 44.61	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	293	CCD	RIGAKU SATURN 92		2006-01-01	M	SINGLE WAVELENGTH
2	1	293	AREA DETECTOR			2006-01-01

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	ROTATING ANODE	RIGAKU FR-E DW	1.54
2	NUCLEAR REACTOR		0.6-0.7

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (Observed)	R Merge I (Observed)	R Sym I (Observed)	Rrim I (All)	Rpim I (All)	CC (Half)	R Split (All)	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	1.53	100	92.1									3696	3696

Refinement

Statistics
Diffraction ID	Structure Solution Method	Resolution (High)	Resolution (Low)	Cut-off Sigma (I)	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 (Depositor)	R-Work (DCC)	R-Free (Depositor)	R-Free (DCC)	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	1.53	100			3696	3696	178				0.1937	0.1894	0.2359	0.173	random, throughout
NEUTRON DIFFRACTION	MOLECULAR REPLACEMENT	1.4	100			4680	4680	240				0.3007		0.3147		random, throughout

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]

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms
Nucleic Acid Atoms	240
Solvent Atoms	41
Heterogen Atoms

Software

Software
Software Name	Purpose
CrystalClear	data collection
PHASER	phasing
nCNS-TINKER	refinement
d*TREK	data reduction
SCALA	data scaling