Extended Data Table 1 |.

Crystal-packing analyses of crystal structures of the human STING LBD in the ligand-bound, lid-closed conformation

PDB ID	Ligand	Side-by-side packing	Lid	Space group	Crystallization condition
4F5D	c-di-GMP	Yes	closed	P41	0.025 M MgSO4, 0.0 5M Tris-HCl pH 8.5, 1.8M (NH4)2SO4
4KSY	2’,3’-cGAMP	Yes	closed	C2	27% PEG 3,350, 0.1 M Bis-Tris, pH 6.8, 0.2 M NaCl
5BQX	3’,2’-cGAMP	Yes	closed	P41212	0.2 M ammonium acetate, 0.1 M trisodium citrate, pH 5.8, 25% PEG4000
4LOH	2’,3’-cGAMP	Yes	Closed	P1	0.01 M NiCl2, 0.1 M Tris, 20% PEG2000, pH 8.5
4LOI	2’,2’-cGAMP	Yes	Closed	P1	1.6 M NaH2PO4, 0.4 M Na2HPO4, 0.1 M phosphate-citrate, pH 4.2
4QXP	DMXAA	Yes	Closed	P21	0.2 M Li2SO4, 20% PEG 3350, 0.015 mM CYMAL-7, 0.1 M Tris, pH 8.1
4QXQ	DMXAA	Yes	Closed	P6	0.2 M Ca(Ac)2, 15% PEG3000, 0.01 M L-Proline, 0.1 M NaAc, pH 5.1
4QXR	DMXAA	Yes	Closed	P6	0.2 M Ca(Ac)2, 15% PEG3000, 0.1 M LiCl, 0.1 M NaAc, pH 5.1
4QXO	DMXAA	No	Closed	P6122	2 M LiCl, 10% PEG6000, 0.01 M CaCl2, 0.1 M Tris, pH 7.8

All of these structures (except one) contain the side-by-side packing interaction that mediates the formation of the tetramer and higher-order oligomers.