TABLE 1.

Details of structural data collection and refinement

Dataset	Inflection	Peak	Remote
Data collection
Wavelength	0.97941 Å	0.97930 Å	0.96411 Å
Symmetry	I4122	I4122	I4122
Cell dimensions	a = b = 130.4, c = 209.5	a = b = 130.4, c = 209.5	a = b =130.4, c = 209.5
Resolution	50 to 2.9 Å	50 to 3.1 Å	50 to 3.1 Å
Unique observations	20,363 (2909)	14,375 (2100)	16,769 (2412)
Rpima	0.025 (0.420)	0.034 (0.305)	0.017 (0.336)
Mean((I)/S.D.(I))	11.3 (1.8)	9.9 (2.2)	15.2 (1.8)
Completeness	99.8% (100%)	87.0% (88.6%)	99.7% (100%)
Redundancy	6.4 (6.3)	4.1 (4.1)	6.4 (6.5)
Refinement
Rworkb	0.213
Rfreeb	0.250
Residues
Chain A	71–293, 298–334
Chain B	71–334
Total protein atoms	3924
Total waters	32
Bond lengths	0.016 Å
Bond angles	1.508°
Ramachandran analysis
Favored	91.89%
Allowed	7.34%
Outlier	0.77%
Average total B factor
Protein atoms	102.5 Å2
Average isotropic B factor
Non-protein atoms	45.9 Å2

^a R_pim = √(1/(n − 1))·Σ(|I_i − I_mean|)/Σ(I_i).

^b R_work = Σ_hkl‖F_o| − |F_c‖/Σ_hkl|F_o| for all data excluding the 5% that comprised the R_free used for cross-validation.