MgRNA: Classification of Mg2+ binding sites in RNA crystal structures Back to Classification Home Download this subset in: CSV, XML, JSON Representative site 2v48:G2217, See in JSmolClick on the image to toggle views Site type: Oph·Ob·Nb Schematic drawing for Oph·Ob·Nb List of all 149 Mg2+ binding sites with the site type Oph·Ob·Nb in RNA crystal structures in the full dataset (switch to benchmark dataset) Sites in the table can be ordered by the following fields by clicking the column header: "benchmark dataset", "Coordination Number", "Qv #", "Qs #", "Qe #", "PDB ID" or "Mg2+ ID" Page 2 of 6 | « Previous | Next » | 1 | 2 | 3 | 4 | 5 | 6

Mg2+ ion Site type Validation parameters PDB ID Mg2+ ID Coordination Number Qv # Qs # Qe # benchmark dataset 1xmo A467 Oph·Ob·Nb 3   0.06   0.43   0.46 no 1xmq A467 Oph·Ob·Nb 3   0.07   0.47   0.65 no 1xnq A467 Oph·Ob·Nb 3   0.13   0.37   0.69 no 2j00 Z217 Oph·Ob·Nb 3   0.32   0.35   0.92 no 2j02 Z201 Oph·Ob·Nb 3   0.12   0.48   0.83 no 2j02 Z54 Oph·Ob·Nb 3   0.05   0.76   0.85 no 2uuc Z1163 Oph·Ob·Nb 3   0.07   0.41   0.88 no 2uxc Z177 Oph·Ob·Nb 3   0.07   0.45   0.96 no 2v48 G2217 Oph·Ob·Nb 4   0.56   0.69   0.76 no 2vhn Z4037 Oph·Ob·Nb 6   0.19   0.87   0.79 no 2vho Z4050 Oph·Ob·Nb 5   0.18   0.71   0.57 no 2vhp Z4039 Oph·Ob·Nb 6   0.19   0.58   0.98 no 2vqe Z192 Oph·Ob·Nb 3   0.07   0.42   0.43 no 2wdg Z217 Oph·Ob·Nb 3   0.53   0.33   0.87 no 2wdh Z51 Oph·Ob·Nb 3   0.74   0.22   0.72 no 2wdh Z288 Oph·Ob·Nb 3   0.50   0.14   0.72 no 2wdh Z61 Oph·Ob·Nb 3   0.08   0.63   0.84 no 2wdk Z235 Oph·Ob·Nb 3   0.13   0.25   0.80 no 2wdm Z49 Oph·Ob·Nb 3   0.04   0.78   0.66 no 2wdm Z218 Oph·Ob·Nb 3   0.18   0.39   0.72 no 2xfz Z602 Oph·Ob·Nb 3   0.09   0.66   0.84 no 2xg1 Z501 Oph·Ob·Nb 4   0.37   0.57   0.57 no 2z75 B308 Oph·Ob·Nb 5   0.10   0.78   0.75 no 3ccm 08073 Oph·Ob·Nb 4   0.14   0.62   0.61 no 3cxc 98095 Oph·Ob·Nb 4   0.21   0.48   0.87 no

^# Validation parameters Q_v, Q_s, Q_e are defined in the range of 0 to 1, with 0 indicating poorest reliability and higher value indicating a more reliable site
Q_v measures the agreement of the inner-sphere bond valence summation with the oxidation state of Mg²⁺ (+2)
Q_s measures the geometrical symmetry of the ligands distribution around the Mg²⁺ required for octahedral geometry
Q_e measures the agreement of the isotropic atomic displacement (B) factor and occupancy of the Mg²⁺ compared to those of all atoms in its environment

Site type used in the classification is a string abbreviation of ligand composition in Mg2+ coordination sphere
Abbreviations used for Mg2+ "Site type"	Mg2+ inner-sphere ligands	Geometry for inner-sphere OP	Mg2+ outer-sphere moieties
	Oph phosphate oxygen (OP1/OP2) Or ribose oxygen (O2'/O4')      or oxygen bridging phosphate and ribose (O3'/O5') Ob nucleobase oxygen      Nb nucleobase nitrogen	cis- two OP ligands adopt cis- isoform trans- two OP ligands adopt trans- isoform fac- three OP ligands adopt fac- isoform mer- three OP ligands adopt mer- isoform	Pout phosphate moiety Rout ribose moiety Bout nucleobase moiety
Reference:	Zheng H, Shabalin IG, Handing KB, Bujnicki JM, Minor W. (2015) Magnesium binding architectures in RNA crystal structures: validation, binding preferences, classification, and motif detection. Nucleic Acid Research 43(7):3789-801 [Pubmed].

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