Table 3. Superposition of the present structures with reported structures.

A C^α superposition was performed between the present structures (top) and the reported structures (left). Amino-acid residues with alternate conformations were excluded from the calculation. The r.m.s.d. value of the interatomic distances between corresponding C^α atoms after the superposition is shown; 289–313 C^α atoms were used for the calculation. A statistical examination (Mann & Whitney, 1947 ▸) of the positional differences between the distributions of C^α deviations using the Mann–Whitney U-test is available in Supplementary Table S2. R.m.s.d.s are given in Å.

	Liganded oil–SFX	Liganded water–SFX	Unliganded oil–SFX	Liganded SR1	Liganded SR2
4ow3 (unliganded SFX)	0.228	0.224	0.203	0.216	0.210
3qh1 (liganded SR)	0.178	0.182	0.193	0.148	0.135