Table 1.

Selected crystal data, data collection and refinement parameters^*

Data collection
Space group	C2
Cell dimensions a, b, c (Å), β (°)	98.40, 66.66, 76.93, 122.3
Wavelength (Å)	0.9785 Å
Resolution (last shell; Å)	42.0–1.80 (1.86-1.80)
Unique reflections	37,768 (3,643)
Completeness (%)	97.3 (94.7)
R-merge	0.061 (0.248)
I/σ(I)	42.7 (4.6)
Refinement
Working set reflections	35,877
Test set reflections (5 %)	1,886
No. protein / DNA / H2O / Na+	2,169 / 486 / 167 / 1
R-work / R-free (5%)	0.215 / 0.241
Average B-factors (Å2)
Protein / DNA / solvent	30. 9 / 29.4 / 37.3
R.m.s. deviations
bond lengths (Å)	0.016
bond angles (°)	1.7

^*Values in parentheses refer to the last resolution shell.