4GS2

DNA Holliday junction stabilized by iodine halogen bond. I1J construct in related reference.

X-RAY DIFFRACTION

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	hanging drop	7	298	0.7mM DNA, 25mM sodium cacodylate pH 7.0 buffer, 10-25mM calcium chloride, and 0.8-1.2mM spermine, equilibrated against a reservoir of 30-40% aqueous MPD, hanging drop, temperature 298K

Crystal Properties
Matthews coefficient	Solvent content
2.49	50.65

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 65.739	α = 90
b = 25.187	β = 110.88
c = 37.171	γ = 90

Symmetry
Space Group	C 1 2 1

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray	133	IMAGE PLATE	RIGAKU RAXIS		2004-10-31	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	ROTATING ANODE		1.5418

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (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	50	73.9			4645	3432	1.4	2	18.4

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Starting model	Resolution (High)	Resolution (Low)	Cut-off Sigma (F)	Number Reflections (All)	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	2ORG	1.9	23.3	1.4	4645	3423	345	73.7	0.235	0.261	RANDOM	31.4219

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]
-6.64		-0.06	7.2		-0.56

RMS Deviations
Key	Refinement Restraint Deviation
c_dihedral_angle_d	18.5
c_improper_angle_d	1.4
c_angle_deg	0.9
c_bond_d	0.005
c_mcbond_it
c_mcangle_it
c_scbond_it
c_scangle_it

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms
Nucleic Acid Atoms	404
Solvent Atoms	73
Heterogen Atoms

Software

Software
Software Name	Purpose
CNS	refinement
PDB_EXTRACT	data extraction

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM133198.