Table 3.

Electrostatic potentials at 2′-OH of each nonterminal residue of the modified branch helix

Atom	Electrostatic potential (kcal/mol/e)	Distance (Å)	SASA (Å2)
G3	−1.3 ± 0.31	16.58	16.8
U4	−1.42 ± 0.36	15.51	16.1
G5	−1.29 ± 0.45	14.49	25.77
U6	−1.72 ± 0.73	12.17	15.32
A7	−2.69 ± 0.48	9.45	10.61
G8	−2.27 ± 0.66	9.98	24.36
U9	−1.11 ± 0.5	15.49	20.54
A20	−0.84 ± 0.62	22.74	22.48
C21	−0.92 ± 0.5	17.46	19.1
U22	−3.52 ± 0.42	11.58	5.32
A23	−2.85 ± 0.58	5.89	8.67
A24**	−3.7 ± 0.4	0.00	0.65
C25	−1.59 ± 0.37	5.73	27.35
A26	−1.45 ± 0.3	10.17	18.43
C27	−1.11 ± 0.65	14.29	20.74

The distance is from the specific atom to the 2′-OH of the branch site adenosine (denoted by ^*). The surface is the solvent accessible surface of the specific atom calculated by the NACCESS program.