MgRNA: Classification of Mg2+ binding sites in RNA crystal structures Back to Classification Home Download this subset in: CSV, XML, JSON Representative site 2r8s:R1004, See in JSmolClick on the image to toggle views Site type: 2Ob Schematic drawing for 2Ob List of all 1662 Mg2+ binding sites with the site type 2Ob 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 9 of 67 | « Previous | Next » | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13

Mg2+ ion Site type Validation parameters PDB ID Mg2+ ID Coordination Number Qv # Qs # Qe # benchmark dataset 2uub Z1027 2Ob 2   0.26   0.25   0.60 no 3i55 08075 2Ob 6   0.26   0.84   0.90 no 3cc4 08075 2Ob 6   0.26   0.96   0.90 no 4k27 U102 2Ob 3   0.26   0.39   0.45 no 2qex 08042 2Ob 6   0.26   0.88   0.99 no 4g5k A1659 2Ob 2   0.26   0.19   0.98 no 1vq7 08042 2Ob 6   0.26   0.72   0.97 no 1qvg 08042 2Ob 6   0.25   0.84   0.58 no 1vq9 08042 2Ob 6   0.25   0.85   0.77 no 3ccm 08032 2Ob 6   0.25   0.86   0.72 no 3v2d A3278 2Ob 4   0.25   0.38   0.92 no 2uuc Z1167 2Ob 2   0.25   0.05   0.53 no 1q86 A8042 2Ob 6   0.25   0.90   0.95 no 2otl 08042 2Ob 6   0.25   0.96   1.00 no 1yj9 08042 2Ob 6   0.24   0.87   0.93 no 3i56 08075 2Ob 6   0.24   0.91   0.76 no 1vq4 08042 2Ob 6   0.24   0.86   0.84 no 1qvg 08097 2Ob 5   0.24   0.75   0.89 no 3g71 08075 2Ob 6   0.24   0.89   0.85 no 3cc4 08076 2Ob 6   0.24   0.84   0.88 no 3ccj 08076 2Ob 5   0.24   0.71   0.57 no 1vql 08042 2Ob 6   0.24   0.82   0.83 no 3g6e 08076 2Ob 6   0.24   0.91   0.82 no 1vx9 A3118 2Ob 2   0.23   0.32   0.76 no 1vqk 08097 2Ob 5   0.23   0.66   0.75 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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