Table 1. Hydrogen exchange rate constants (kex, s−1) of the imino protons of the WT and mutant pri-miR156a constructs in 90% H2O/ 10% D2O buffer containing 10 mM TRIS-d11, 50 mM NaCl at 16°C (pH = 8.25) and 23°C (pH = 8.03).
Temp | Imino | WT | A9C | A9AC | A10G | A10CG |
---|---|---|---|---|---|---|
16°C | G94 | 0.7 ± 0.4 | 0.7 ± 0.4 | 0.8 ± 0.4 | 0.9 ± 0.5 | 0.8 ± 0.4 |
U95 | 3.8 ± 0.3 | 3.3 ± 0.2 | 3.4 ± 0.2 | 4.3 ± 0.3 | 3.4 ± 0.4 | |
G17 | 0.3 ± 0.2 | 0.4 ± 0.2 | 0.4 ± 0.2 | 0.3 ± 0.2 | 0.4 ± 0.3 | |
U16 | 7.5 ± 0.4 | 5.1 ± 0.4 | 5.9 ± 0.2 | 8.5 ± 0.4 | 4.2 ± 0.5 | |
G98 | 5.0 ± 0.6 | 3.8 ± 0.4 | 4.0 ± 0.3 | 4.4 ± 0.3 | 3.7 ± 0.5 | |
U100 | n.d.a | n.d. | 198 ± 8 | 249 ± 64 | 194 ± 38 | |
U101 | 89.1 ± 4.9 | 78.5 ± 5.3 | 13.4 ± 0.4 | 17.3 ± 0.7 | 13.0 ± 0.8 | |
G11 | 13.2 ± 0.8 | 8.6 ± 0.7 | 4.9 ± 0.5 | 0.6 ± 0.4 | 0.9 ± 0.5 | |
G10 | −b | − | − | 5.2 ± 0.7 | 1.0 ± 0.5 | |
G104 | − | − | 26.6 ± 0.9 | − | 12.9 ± 1.4 | |
G105 | − | 6.8 ± 0.6 | − | − | − | |
23°C | G94 | 1.0 ± 0.2 | 1.0 ± 0.4 | 1.4 ± 0.4 | 1.5 ± 1.0 | 0.9 ± 0.4d |
U95 | 4.8 ± 0.3 | 4.5 ± 0.6 | 7.2 ± 0.5 | 8.9 ± 0.9 | 5.8 ± 0.7 | |
G17 | 0.4 ± 0.2 | 0.5 ± 0.2 | 0.4 ± 0.3 | 0.5 ± 0.4 | 0.5 ± 0.2 | |
U16 | 11.1 ± 0.4 | 7.8 ± 0.7 | 13.5 ± 0.6 | 19.0 ± 0.9 | 6.6 ± 0.9 | |
G98 | 7.2 ± 0.5 | 5.4 ± 0.8 | 8.7 ± 0.5 | 10.0 ± 0.9 | 6.7 ± 0.9 | |
U100 | n.a.c | n.a. | n.d. | n.d. | n.d. | |
U101 | n.d. | n.d. | 39.8 ± 1.7 | 43.5 ± 1.2 | 26.7 ± 1.2 | |
G11 | 32.5 ± 3.4 | 17.8 ± 2.8 | 11.1 ± 1.2 | 1.2 ± 0.7 | 1.0 ± 0.6 | |
G10 | − | − | − | 11.2 ± 0.8 | 0.9 ± 0.4d | |
G104 | − | − | 86.8 ± 12.4 | − | 16.1 ± 1.6 | |
G105 | − | 15.0 ± 1.4 | − | − | − |
aNot determined because of severe line-broadening.
bNo imino proton resonance.
cNot available because the imino proton resonance disappeared.
dThe G10 and G94 resonances overlapped with each other.