Table 2. Refinement and model statistics.

Values in parentheses are for the highest of 20 resolution shells.

Beamline	ALS 5.0.3
Resolution range (Å)	20–1.55 (1.59–1.55)
Rcryst†	0.157
Rfree†	0.188
R.m.s.d. bonds (Å)	0.014
R.m.s.d. angles (°)	1.42
Protein atoms	3913
Nonprotein atoms	859
Mean B factor (Å2)	9.9
Residues in favored region	456 [97%]
Residues in allowed region	6 [1.3%]
Residues in disallowed region	6 [1.3%]
MolProbity‡ score (percentile)	1.46 [90th]
PDB code	3krs

^† R _cryst = . The free R factor was calculated using an equivalent equation with the 5% of the reflections that were omitted from the refinement.

^‡Chen et al. (2010 ▶).