Table 2. Intermonomeric salt bridges of FCSQ and DCSQ2.

	FCSQ				Dog CSQ2
Salt Bridge	Distance (Å)	U(r) (kcal/mol)	ε(r) = Deff	U(ε(r)) (kcal/mol)	Distance (Å)	U(r) (kcal/mol)	ε(r) = Def	U(ε(r)) (kcal/mol)
D13–K45’	3.01	18.79	6.0	3.12	2.95	21.47	5.9	3.64
D13–K49’	2.86	23.61	5.7	4.13	2.91	23.85	5.8	4.10
D13’–K49	2.90	15.43	5.8	2.66	2.89	15.84	5.8	2.74
E300–K68’	3.11	22.94	6.2	3.69	2.95	22.54	5.9	3.82
E59–K49’	3.08	22.29	6.2	3.62	3.02	22.67	6.0	3.75
E59’-K49	2.74	26.76	5.5	4.88	2.83	26.47	5.7	4.68

Distance is measured from the center of mass of the nitrogen basic residue (donor) and the center of mass of the oxygen in the acidic residue (acceptor). U(r) is the interaction energy with no solvent screening effect. D_eff is as described in the methods using a value of A = 2. U(ε(r)) is the interaction energy calculated using D_eff that incorporates solvent screening.