MgRNA: Classification of Mg2+ binding sites in RNA crystal structures Back to Classification Home Download this subset in: CSV, XML, JSON Representative site 2qan:A2016, See in JSmolClick on the image to toggle views Site type: 2Pout·2Bout Schematic drawing for 2Pout·2Bout List of all 453 Mg2+ binding sites with the site type 2Pout·2Bout 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 19 | « 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 2qan A2340 2Pout·2Bout 5   0.81   0.80   0.97 yes 2qal A2342 2Pout·2Bout 6   0.97   0.99   1.00 yes 2qan A2346 2Pout·2Bout 6   0.97   1.00   1.00 yes 2qbb A2346 2Pout·2Bout 6   0.97   1.00   1.00 yes 3df3 A2346 2Pout·2Bout 6   0.97   1.00   1.00 yes 2qan A2353 2Pout·2Bout 6   0.97   0.99   1.00 yes 1vs8 B2907 2Pout·2Bout 6   0.97   1.00   1.00 yes 2qp1 B2907 2Pout·2Bout 6   0.97   1.00   1.00 yes 3i1r A2916 2Pout·2Bout 6   0.76   0.99   1.00 yes 2qp1 B2917 2Pout·2Bout 6   0.97   0.99   1.00 yes 3ofq A2918 2Pout·2Bout 5   0.81   0.80   0.71 yes 3og0 A2920 2Pout·2Bout 6   0.75   1.00   0.96 yes 1vt2 A2921 2Pout·2Bout 6   0.75   1.00   0.88 yes 3ofd A2921 2Pout·2Bout 6   0.75   1.00   0.63 yes 3oas A2921 2Pout·2Bout 6   0.75   1.00   0.93 yes 3ofq A2922 2Pout·2Bout 6   0.75   1.00   0.96 yes 2aw4 B2937 2Pout·2Bout 6   0.97   0.99   1.00 yes 1vs6 B2937 2Pout·2Bout 6   0.97   0.99   1.00 yes 2qov B2946 2Pout·2Bout 5   0.81   0.80   1.00 yes 3ofq A2953 2Pout·2Bout 5   0.82   0.80   0.72 yes 2qoz B2953 2Pout·2Bout 6   0.97   0.99   1.00 yes 1vs6 B2957 2Pout·2Bout 6   0.98   0.99   1.00 yes 3orb A2959 2Pout·2Bout 6   0.74   0.99   0.27 no 2z4n B2963 2Pout·2Bout 6   0.97   1.00   1.00 yes 3i1t A2963 2Pout·2Bout 6   0.74   0.99   1.00 yes

^# 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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