Table 1. X-ray diffraction and data-collection statistics.

The values in parentheses refer to the outermost shell.

	VN5-3	VN4-3
Wavelength (Å)	0.98	1.0
Space group	R32	R32
Unit-cell parameters (Å, °)	a = b = 76.29, c = 303.35, α = β = 90, γ = 120	a = b = 76.28, c = 304.39, α = β = 90, γ = 120
No. of molecules in AU	2	2
No. of observed reflections	83182	259886
No. of unique reflections	7107	20434
Resolution (Å)	30.0–3.0 (3.11–3.0)	30.0–2.2 (2.25–2.2)
Completeness of data (%)	100 (99.9)	100 (100)
I/σ(I)	17.7 (5.4)	25.1 (4.1)
Rmerge† (%)	17.0 (54.3)	9.8 (49.7)

^† R _merge = , where I(h, i) is the intensity of ith measurement of reflection h and 〈I(h)〉 is the mean value of I(h, i) for all i measurements.