Table 2. Data-collection statistics.

Values in parentheses are for the outermost resolution shell.

	HigBA2 form I	HigBA2 form II	HigA2 C-terminal domain
Crystallization condition	100 mM bicine/Tris pH 8.5, 12.5%(w/v) PEG 1000, 12.5%(w/v) PEG 3350, 12.5%(w/w) MPD, 30 mM NaF, 30 mM NaBr, 30 mM NaI	200 mM ammonium sulfate, 100 mM sodium cacodylate trihydrate pH 6.5, 30%(w/v) PEG 8000	100 mM Tris–HCl pH 8.5, 200 mM calcium chloride, 20%(w/v) PEG 4000
Resolution range (Å)	40.5–3.0 (3.10–3.00)	40.1–2.2 (2.48–2.19)	38.5–1.8 (1.91–1.80)
Unit-cell parameters	a = 129.0, b = 119.8, c = 33.4	a = 134.5, c = 55.4	a = 115.4, b = 61.2, c = 73.9, β = 106.7
Space group	P21212	P3221	C2
Mosaicity (°)	0.075	0.092	0.560
R merge †	0.078 (0.691)	0.114 (1.63)	0.053 (0.589)
No. of measured reflections	41100 (6495)	206547 (36513)	179186 (21013)
No. of unique reflections	10916 (1010)	25120 (4612)	44925 (6741)
Multiplicity	3.8 (6.4)	8.2 (7.9)	4.0 (3.1)
〈I/σ(I)〉	10.88 (1.64)	12.51 (1.25)	12.90 (2.30)
Completeness (%)	98.5 (94.9)	99.3 (95.8)	97.5 (91.4)

^† R _merge =