Table 1. Data-collection and processing statistics.

Values in parentheses are for the highest resolution shell (2.12.21).

Crystal parameters
Space group	P41212
Unit-cell parameters (, )	a = 57.69, b = 57.69, c = 172.60, = 90, = 90, = 90
Data collection
Resolution ()	47.962.10 (2.212.10)
Wavelength ()	0.9763
R merge † (%)	10.3 (50.6)
R p.i.m. ‡ (%)	4.3 (20.5)
I/(I)	13.5 (4.0)
No. of unique reflections	17928
Multiplicity	6.7 (7.0)
Completeness (%)	100 (100)
Refinement
Resolution ()	2.1
R § (%)	0.206
R free ¶ (%)	0.241
R.m.s.d. stereochemistry††
Bond lengths ()	0.114
Bond angles ()	1.294
No. of protein atoms	1857
No. of water molecules	107
Average B factor (2)	18.09
Ramachandran analysis‡‡ (%)
Favoured	96.2
Allowed	100.0
Disallowed	0

^† R _merge = , where I _i(hkl) is the integrated intensity of a given reflection and I(hkl) is the mean intensity of multiple corresponding symmetry-related reflections.

^‡ R _p.i.m. = , where I _i(hkl) is the integrated intensity of a given reflection, I(hkl) is the mean intensity of multiple corresponding symmetry-related reflections and N is the multiplicity of a given reflection.

^§ R = , where F _o and F _c are the observed and calculated structure factors, respectively.

^¶ R _free is the same as R but calculated using 5% random data excluded from the refinement.

^††R.m.s.d. stereochemistry is the deviation from ideal values.

^‡‡Ramachandran analysis was carried out using MolProbity (Davis et al., 2007 ▶).