Table 1. Data collection and refinement statistics of A-DNA decamers GCGTATACGC in space group P212121.
Compound
Salt form |
|
Ba-AOE |
Cs-MEP high |
Cs-TOE medium |
Rb-FET high |
Rb-TOE medium |
K-MEP high |
K-TOE medium |
Na-TOE medium |
Na-FET medium |
Z-DNA |
Unit cell | a, Å | 24.99 | 24.82 | 24.87 | 24.82 | 25.16 | 24.65 | 25.13 | 25.13 | 24.96 | 18.32 |
b, Å | 44.57 | 44.33 | 44.68 | 45.26 | 44.83 | 44.61 | 44.53 | 44.53 | 43.57 | 30.68 | |
c, Å | 45.12 | 44.82 | 44.69 | 43.97 | 44.82 | 44.16 | 45.13 | 45.13 | 45.40 | 42.49 | |
B factora (Å2) | DNA | 21 | 8 | 13 | 12 | 16 | 25 | 15 | 15 | 19 | 6 |
Site 1 | – | 10 | 15 | 15 | 25 | 30 | 33 | – | – | – | |
Site 2 | 35 (Ba) | 25 | 35 | 30 | 40 | 35 | 32 | 21 | 50 (Mg) | – | |
Site 3 | – | 60 | 65 | 69 | 70 | 35 | 34 | 25 | 33 | – | |
High resolution X-ray datab | λ, Å | 1.5418 | 0.8151 | 0.9500 | 0.9500 | 0.9500 | 0.8151 | 0.8151 | 0.8151 | 0.6630 | |
D, Å | 1.70 | 1.06 | 1.05 | 1.05 | 1.30 | 1.30 | 1.30 | 1.45 | 0.60 | ||
N ref | 6913 | 22 132 | 19 840 | 22 802 | 12 230 | 12 024 | 12 024 | 8695 | 57 623 | ||
% | 97.5 | 97.2 | 95.1 | 99.8 | 99.5 | 98.9 | 98.9 | 99.7 | 96.0 | ||
Rmerge | 0.068 | 0.057 | 0.041 | 0.046 | 0.044 | 0.041 | 0.041 | 0.058 | 0.062 | ||
Rwork/free | 19.0/21.2 | 15.0/16.9 | 16.1/17.8 | 15.4/17.0 | 16.5/19.0 | 20.2/24.6c | 16.1/17.9 | 16.1/18.1 | 15.9/19 | 16.0/18.5 | |
Anomalous X-ray datad | λ, Å | 1.5418 | 1.6531 | 1.7970 | 0.8151 | 0.8151 | 1.6513 | ||||
D, Å | 2.50 | 2.0 | 2.0 | 1.50 | 1.50 | 2.0 | |||||
% | 97.5 | 99.3 | 98.7 | 98.8 | 99.1 | 98.4 | |||||
Rmerge | 0.065 | 0.082 | 0.079 | 0.059 | 0.044 | 0.092 | |||||
ΔF/F | 0.0469 | 0.0784 | 0.0384 | 0.0620 | 0.021 | 0.019 | |||||
PP | 1.20 | 1.68 | 1.35 | 2.66 | – | – | |||||
FOM | 0.33 | 0.41 | 0.35 | 0.51 | – | – |
aRefinement with ion occupancy equal to 1.
bR factor = Σhkl|F(hkl)o – F(hkl)c|/ΣhklF(hkl)o. Rmerge = ΣhklΣi|I(hkl)i – <I(hkl)>|/ΣhklΣi<I(hkl)i>. λ, D, the wavelength and resolution of the X-ray data; N ref, %, the number of unique reflections and completeness.
cR factors based on 2.0 Å anomalous data.
dΔF/F =Σhkl<|F(+)| – |F(–)|>/<1/2(|F(+)| + |F(–)|>. PP, FOM, phasing power and figure of merit.