Table 1. Refinement statistics.

Resolution range (Å)	79–3.1
Reflections	12,912
Residues/atoms	848/6,156
aR-factor	0.241
bFree R-factor	0.294
Average residual B after TLS refinement (Å2)	20.6
Bond-length deviation from ideality (Å)	0.015
Bond-angle deviation from ideality (°)	1.7
c Molprobity scores
Ramachandran space (%)
Favored	84.0
Allowed	13.3
Outliers	2.7

^a .

^bThe free R-factor was calculated on 5% of the data omitted at random.

^cReference [30].