Table 1. Data-collection and final refinement statistics.

Data collection
Space group	C2	H32
Resolution (Å)	45.1–1.8 (1.85–1.80)	45.1–1.8 (1.90–1.80)
Unit-cell parameters
a (Å)	108.6	62.74
b (Å)	62.7	62.74
c (Å)	116.3	331.45
α (°)	90.0	90.0
β (°)	108.1	90.0
γ (°)	90.0	120.0
No. of unique reflections	62577 (10063)	21944 (3462)
Multiplicity	3.2 (3.2)	8.8 (9.0)
Data completeness (%)	90.7 (100)	91.3 (100)
R merge † (%)	4.6 (45.1)	5.4 (50.0)
〈I/σ(I)〉	17.3 (3.2)	28.5 (5.1)
Mosaicity (°)	0.50	0.48
Refinement
Resolution limit (Å)	15.0–1.8	15.0–1.8
Protein residues	234 × 3	1–234
No. of lipids	13	5
No. of waters	155	51
R cryst ‡ (%)	20.4	21.1
R free (%)	22.7	24.1
R.m.s.d.
Bond lengths (Å)	0.019	0.018
Bond angles (°)	1.95	2.03
B factor (Å2)
Protein	23.5	23.5
Water	36.7	36.9
Lipids	58.6	60.2

^† R _merge = , where I _i(hkl) is the intensity of an individual reflection and 〈I(hkl)〉 is the mean intensity obtained from multiple observations of symmetry-related reflections.

^‡ R _cryst = . A randomly omitted 5% of the reflections were used for the calculation of R _free.