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 18 of 19 | « Previous | Next » | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19

Mg2+ ion Site type Validation parameters PDB ID Mg2+ ID Coordination Number Qv # Qs # Qe # benchmark dataset 3v2d A3686 2Pout·2Bout 3   0.38   0.39   0.78 no 4dha A3738 2Pout·2Bout 6   0.71   0.98   0.74 yes 4qcn A3746 2Pout·2Bout 2   0.25   0.29   0.99 no 4qcn A3763 2Pout·2Bout 2   0.24   0.29   0.81 no 2vhm Z4027 2Pout·2Bout 4   0.31   0.64   0.70 no 2vhm Z4053 2Pout·2Bout 3   0.09   0.63   0.57 no 2vho Z4054 2Pout·2Bout 2   0.05   0.19   0.39 no 2vhm Z4077 2Pout·2Bout 3   0.10   0.58   0.45 no 4bpp A5012 2Pout·2Bout 6   0.76   0.99   1.00 yes 4bpn A5019 2Pout·2Bout 6   0.75   0.99   1.00 yes 4bpe A5057 2Pout·2Bout 6   0.75   1.00   1.00 yes 4bpn A5057 2Pout·2Bout 6   0.75   1.00   1.00 yes 4bpp A5057 2Pout·2Bout 6   0.75   1.00   1.00 yes 4bpo A5057 2Pout·2Bout 6   0.74   1.00   1.00 yes 4bpo A5062 2Pout·2Bout 6   0.74   1.00   1.00 yes 4bpn A5062 2Pout·2Bout 6   0.74   1.00   1.00 yes 4bpe A5062 2Pout·2Bout 6   0.74   1.00   1.00 yes 3ccs 08046 2Pout·2Bout 5   0.31   0.62   0.91 no 3ccq 08063 2Pout·2Bout 2   0.18   0.19   0.69 no 3cpw 08063 2Pout·2Bout 2   0.11   0.16   0.62 no 1k73 A8082 2Pout·2Bout 4   0.27   0.45   0.76 no 1vqo 08082 2Pout·2Bout 3   0.07   0.36   0.65 no 1kd1 A8082 2Pout·2Bout 4   0.29   0.62   0.81 no 1vqk 08082 2Pout·2Bout 3   0.09   0.25   0.70 no 1q7y A8093 2Pout·2Bout 4   0.16   0.40   0.37 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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