Table 1. Crystallographic data-collection and refinement statistics.

Values in parentheses are for the highest resolution shell.

PDB code	2pm8
Resolution (Å)	50–2.8 (2.9–2.8)
Rmerge† (%)	11.6 (52.9)
Completeness (%)	95.0 (95.0)
Redundancy	4.9 (3.0)
I/σ(I)	5.6 (1.6)
Refinement statistics
R factor‡ (%)	22.5 (30.2)
Rfree§ (%)	29.2 (36.2)
Mean B factor (Å2)	56.4
R.m.s. deviation from ideal
Bond length (Å)	0.012
Bond angle (°)	1.536
Chiral (Å3)	0.101
Ramachandran plot
Most favored regions (%)	80.0
Additional allowed regions (%)	18.9
Generously allowed regions (%)	0.5
Disallowed regions (%)	0.5

^† R _merge = , where I is the observed intensity and 〈I〉 is the average intensity obtained from multiple observations of symmetry-related reflections after rejections.

^‡ R factor = , where F _o are observed and F _c are calculated structure-factor amplitudes.

^§The R _free set uses a randomly chosen 5% of reflections.