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 23 of 67 | « Previous | Next » | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27

Mg2+ ion Site type Validation parameters PDB ID Mg2+ ID Coordination Number Qv # Qs # Qe # benchmark dataset 3i56 08075 2Ob 6   0.24   0.91   0.76 no 3i56 08032 2Ob 6   0.15   0.94   0.90 no 3i8g A1708 2Ob 2   0.07   0.18   0.97 no 3i8g A1586 2Ob 2   0.03   0.19   0.66 no 3i8g A1978 2Ob 2   0.05   0.24   0.80 no 3i8g A1945 2Ob 2   0.03   0.13   1.00 no 3i8g A212 2Ob 2   0.10   0.21   0.54 no 3i8g A1600 2Ob 2   0.04   0.26   0.89 no 3i8g A1732 2Ob 2   0.04   0.16   0.99 no 3i8g A1948 2Ob 2   0.07   0.15   1.00 no 3i8g A1686 2Ob 2   0.05   0.23   0.76 no 3i8g A1568 2Ob 2   0.14   0.27   0.94 no 3i8g A1629 2Ob 2   0.03   0.25   0.84 no 3i8h A1910 2Ob 2   0.07   0.16   0.95 no 3i8h A1642 2Ob 2   0.02   0.16   0.72 no 3i8h A1883 2Ob 2   0.06   0.28   0.94 no 3i8h A1942 2Ob 2   0.05   0.23   1.00 no 3i8h A1650 2Ob 2   0.07   0.08   0.63 no 3i8h A1591 2Ob 2   0.06   0.26   0.51 no 3i8h A2013 2Ob 2   0.06   0.23   0.63 no 3i8h A1868 2Ob 2   0.10   0.25   0.71 no 3i8h A1845 2Ob 2   0.38   0.06   0.30 no 3i8h A2515 2Ob 2   0.09   0.22   0.98 no 3i9b A1864 2Ob 2   0.09   0.17   0.73 no 3i9b A1783 2Ob 2   0.16   0.07   0.40 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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