Table 1. Data-collection and refinement statistics.

Values in parentheses are for the highest resolution shell.

Data collection
Beamline	BL13-XALOC, ALBA
Wavelength (Å)	0.97949
Resolution range (Å)	39–2.1 (2.21–2.10)
Space group	P6122
Unit-cell parameters (Å, °)	a = b = 78.01, c = 91.55, α = β = 90, γ = 120
Total reflections	114934 (9823)
Unique reflections	10091 (1433)
Multiplicity	11.4 (6.9)
Completeness (%)	99.8 (99.8)
〈I/σ(I)〉	30.2 (3.0)
Wilson B factor (Å2)	59.64
R merge †	0.036 (0.578)
Refinement
R work ‡/R free §	0.2361/0.2510
No. of reflections	9432
No. of non-H atoms	622
DNA duplexes per asymmetric unit	1.5
Ligands	3 CD27
Waters	64
R.m.s.d., bond lengths (Å)	0.0238
R.m.s.d., angles (°)	1.6525
Average B factor (Å2)	60.32

^† R _merge = .

^‡ R _work and R _free were calculated as R = .

^§ R _free is the R factor evaluated for the reflections (5%) used for cross-validation during refinement.