Table 4. Protein interface properties for three functional subsets of protein–RNA complexes.

	Virus proteins	Protein synthesis	RNA modification
Number of examples	8	7	5
Families (see Table 1)	(A) 1–5	(B) 6–11	(C) 12–14
ΔASA	826.9 (321.9)	1614.2 (577.3)	932.7 (368.0)
Segments	8.6 (6.7)	11.0 (4.5)	11.2 (6.1)
Gap volume index	3.9 (2.0)	3.2 (1.8)	2.3 (1.1)
Hydrogen bonds	1.3 (0.6)	1.0 (0.2)	1.2 (0.4)
Bridging waters	0.2 (0.2)	0.3 (0.3)	0.4 (0.7)
% Polarity	48.5 (9.7)	45.2 (3.5)	42.0 (4.8)

See legend to Table 3 for definition of properties.