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 7 of 67 | « Previous | Next » | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11

Mg2+ ion Site type Validation parameters PDB ID Mg2+ ID Coordination Number Qv # Qs # Qe # benchmark dataset 3sgf A3214 2Ob 2   0.07   0.36   0.44 no 1vxj A3184 2Ob 2   0.07   0.19   0.44 no 4ej9 A7108 2Ob 2   0.05   0.16   0.44 no 3ms1 A3005 2Ob 2   0.04   0.32   0.44 no 4dv1 A1687 2Ob 4   0.34   0.32   0.44 no 3pyt A2964 2Ob 2   0.04   0.17   0.45 no 3huy A1575 2Ob 2   0.06   0.16   0.45 no 3hux A3111 2Ob 2   0.03   0.21   0.45 no 4kfh A2328 2Ob 2   0.04   0.20   0.45 no 1ibk A210 2Ob 2   0.04   0.16   0.45 no 4k27 U102 2Ob 3   0.26   0.39   0.45 no 1vx9 A3220 2Ob 2   0.04   0.21   0.46 no 4dr7 A1660 2Ob 4   0.38   0.53   0.46 no 3skl B203 2Ob 2   0.08   0.17   0.46 no 2f4v A1633 2Ob 2   0.12   0.06   0.46 no 1n32 A210 2Ob 2   0.04   0.17   0.46 no 2uu9 Z1028 2Ob 2   0.18   0.38   0.46 no 1xmq A1610 2Ob 2   0.13   0.07   0.46 no 1ibk A1614 2Ob 2   0.03   0.13   0.46 no 1vx9 A3203 2Ob 2   0.08   0.29   0.46 no 2j00 Z295 2Ob 2   0.09   0.10   0.46 no 3hux A3100 2Ob 2   0.05   0.23   0.46 no 1vxk A1661 2Ob 2   0.13   0.16   0.47 no 4btd A4040 2Ob 2   0.08   0.24   0.47 no 3f1f A5119 2Ob 2   0.05   0.19   0.47 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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