Table 1. Data-collection and refinement statistics.

Values in parentheses are for the last shell.

Source	Rotating anode, λ = 1.5418 Å
Resolution (Å)	2.1
Temperature	RT
Unit-cell parameters (Å)	a = 43.1, b = 83.2, c = 87.4
Space group	P212121
Rmerge	0.088 (0.577)
〈I/σ(I)〉	17.3 (2.9)
Reflections	18983
Completeness (%)	99.8 (100.0)
Rfree/Rcryst	0.218/0.176
Atoms
Protein	2460
Ca	2
Waters	189
〈B〉 (Å2)
Overall	28.5
Protein	27.5
Solvent	42.2
Ions	20.0
R.m.s.d. bond lengths (Å)	0.0056
R.m.s.d. bond angles (°)	1.431
Luzzati error (Å)	0.22