Table 1. Crystallographic data and refinement statistics.

Data collection
Wavelength (Å)	0.97
Space group	P 63 2 2
Unit cell dimensions (Å)	a=b=135.72c=202.13
Molecules/asymmetric unit	4
Resolution range (Å)	50.00–2.8
Unique observations	27,721
Completeness (%)*	99.8 (100)
Rsym (%)	7.2 (7.3)
I/s(I)	11.2 (1.9)
Refinement
Resolution (Å)	10–2.8
Rcryst, Rfree *	0.22 (0.39), 0.26 (0.36)
Reflections (working/test)	25,543/1,346
Protein atoms	3,720
Sulfate atoms	30
R.m.s.d. bond lengths (Å)	0.01
R.m.s.d. angles (Å2)	1.5
<B> protein (Å2) :	75
Ramachandran plot
Most favoured (%)†	90.7
Allowed (%)	7.8
Generously allowed (%)	1.5

R.m.s.d., root mean-squared deviation.

^*High-resolution shell for data collection is 2.8–2.85 and for refinement 2.8–2.87.

^†Calculated by PROCHECK.