Table 2.

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

Atom	Electrostatic potential (kcal/mol/e)	Distance (Å)	SASA (Å2)
G3	−0.92 ± 0.36	18.62	15.49
U4	−0.92 ± 0.69	17.95	24.83
G5	−1.42 ± 0.28	14.84	21.88
U6	−1.28 ± 0.42	10.59	26.35
A7	−1.69 ± 0.29	8.38	17.36
G8	−1.47 ± 0.55	10.90	22.62
U9	−1.04 ± 0.42	15.97	23.49
A20	−1.19 ± 0.44	21.70	19.04
C21	−1.15 ± 0.49	17.52	22.48
U22	−1.45 ± 0.52	11.40	14.72
A23	−1.5 ± 0.27	5.83	17.04
A24*	−1.45 ± 0.24	0.00	16.98
C25	−1.28 ± 0.37	5.98	17.82
A26	−0.92 ± 0.76	11.70	21.52
C27	−1.19 ± 0.4	16.54	18.82

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.