Table 1A.

X-ray crystallography data collection and refinement statistics

Data collection
Cell parameters (Å)	a = 167.074, b = 167.074, c = 65.156 α = β = 90°, γ = 120°
Space group	P321
Wavelength (Å)	0.9794
Resolution (Å)	50 (2.95) – 2.9
No. of all reflections	233550
No. of unique reflections	23503
Completeness (%)	99.9 (100)
Redundacy	9.9 (10.1)
I/σI	6.2 (2.7)
Rmerge (%)	9.4 (66.9)
Refinement
Resolution (Å)	50 – 2.9
Total No. of reflections	23501
No. of reflections used	22293
Rwork/Rfree (%)	25.5/26.8
No. of atoms	3875
Protein	3836
Water	3
SSA	1
PO43−	1
Mg2+	2
R.m.s. deviations
Bond lengths (Å)	0.007
Bond angle (°)	1.0
Average B-factors (Å2)	69.7