Table 1. Structure solution and refinement.

Values in parentheses are for the outer shell.

Resolution range (Å)	30.05–1.65 (1.74–1.65)
Completeness (%)	99.8
σ cutoff	F > 1.35σ(F)
No. of reflections, working set	9654 (1188)
No. of reflections, test set	964 (131)
Final R cryst	0.227 (0.223)
Final R free	0.243 (0.265)
No. of non-H atoms
Nucleic acid	568
Water	44
Total	612
R.m.s. deviations
Bonds (Å)	0.003
Angles (°)	0.846
Average B factors (Å2)
Nucleic acid	43.2
Water	46.1