ISDA

X-RAY DIFFRACTION

Crystallization Details

Method	pH	Temprature	Details
X-RAY DIFFRACTION	7.0	293	Racemic DNA solution, sodium cacodylate, magnesium chloride, sodium chloride, spermine tetrahydrochloride, MPD For crystallization, we used four strands (1) d(CGCTATAATGCG) with L-sugars (2) d(CGCATTATAGCG) with L-sugars and (3) d(CGCTATAATGCG) with D-sugars (4) d(CGCATTATAGCG) with D-sugars Enantio-pure L-DNA solution (strands 1,2) and D-DNA solution (strands 3,4) were prepared first with denaturation followed by slow annealing process to ensure proper folding of the duplex formed between the non-self complementary strands. After annealing, the enantiopure solutions were mixed in equimolar ratio and this racemic mixture was used for crystallization.

Unit Cell:

a: 28.905 Å b: 68.454 Å c: 34.211 Å α: 90.00° β: 90.00° γ: 90.00°

Symmetry:

Space Group: P n n a

Crystal Properties:

Matthew's Coefficient: 2.32 Solvent Content: 64

Refinement Statistics

Diffraction ID	Structure Solution Method	Cross Validation Method	Resolution Limit (High)	Resolution Limit (Low)	Number of Reflections (Observed)	Number of Reflections (R-free)	Percent Reflections (Observed)	R-Work	R-Free	Mean Isotropic
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	THROUGHOUT	2.30	34.23	2678	147	96.58	0.27591	0.35745	37.461

Data Collection

Overall

Resolution Limit (High)	Resolution Limit (Low)	Percent Possible (Observed)	R Merge I (Observed)	R Sym 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
2.30	34.23	96.61	0.045	?	8.87	1.8	?	2825	?	?	?

Highest Resolution Shell

#	Resolution Limits (Low)	Resolution Limits (High)	Percent Possible (All)	Percent Possible (Observed)	R-Sym I (Observed)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1	2.30	2.38	78.57	?	?	1.34	1.6	?

Diffraction

Diffraction experiment

Crystal ID	Scattering Type	Data Collection Temprature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1		150 K			?

Radiation Source

Source	Type	Wavelength List	Synchrotron Site	Beamline
ROTATING ANODE	RIGAKU FR-X	1.54	?	?

Software