4GSG

DNA Holliday junction stabilized by chlorine halogen bond. Cl1J construct of related reference.

X-RAY DIFFRACTION

Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	2ORG

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 Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 65.578	α = 90
b = 24.355	β = 110.85
c = 37.243	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	CCD	NOIR-1		2009-10-21	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	ALS BEAMLINE 4.2.2	0.9	ALS	4.2.2

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	1.7	50	79.2			6244	4947	1.4	2	6.7

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-Work (Depositor)	R-Work (DCC)	R-Free (Depositor)	R-Free (DCC)	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	THROUGHOUT	2ORG	2	30.64	6244	3667	212	94.8	0.271	0.27	0.322	0.32	RANDOM	14.3574

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]
1.8		-0.94	3.64		-5.44

RMS Deviations
Key	Refinement Restraint Deviation
c_dihedral_angle_d	16.5
c_scangle_it	2.42
c_scbond_it	1.77
c_improper_angle_d	0.88
c_angle_deg	0.4
c_bond_d	0.001
c_mcbond_it
c_mcangle_it

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms
Nucleic Acid Atoms	808
Solvent Atoms	159
Heterogen Atoms

Software

Software
Software Name	Purpose
CNS	refinement
PDB_EXTRACT	data extraction
HKL-2000	data collection
HKL-2000	data reduction
HKL-2000	data scaling
EPMR	phasing

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 R01GM157729.