Table 3. Structure refinement.

Values in parentheses are for the outer shell.

Resolution range (Å)	28.80–2.50 (2.57–2.50)
Completeness (%)	98.4
σ cutoff	None
No. of reflections, working set	2955 (210)
No. of reflections, test set	135 (6)
Final R cryst	0.190 (0.258)
Final R free	0.221 (0.373)
No. of non-H atoms
Protein	444
Ions (Cl−)	3
Waters	28
Total	475
R.m.s. deviations
Bonds (Å)	0.012
Angles (°)	1.402
Average B factors (Å2)
Protein	21.4
Ions (Cl−)	46.0
Waters	28.0
Ramachandran plot (%)
Favoured regions	94.7
Additionally allowed	3.5
Outliers	1.8