Table 1.

Selection of multi-domain RNA structures used for H-bond analysis

PDB	Resolution/Å	Description	nt	Pairs	H-bonds	BH-bonds	Reference
3DIL	1.90	Lysine riboswitch	173	118	257	46	39
1J1U	1.95	tRNATyr	74	51	101	20	40
2R8S	1.95	Group I intron P4–P6 domain	159	102	205	57	41
3D2V	2.00	TPP riboswitch	154	122	235	84	42
1M5O	2.20	Hairpin ribozyme complex with U1A protein	224	114	241	23	43
1VQ8	2.20	Haloarcula marismortui large ribosomal subunit	2874	2426	4661	1724	44
2VQE	2.50	Escherichia coli small ribosomal subunit	1522	1252	2396	814	33
2V3C	2.50	7S RNA of SRP	192	109	231	43	45
Total			5372	4294	8327	2811