MgRNA: Classification of Mg2+ binding sites in RNA crystal structures Back to Classification Home Download this subset in: CSV, XML, JSON Representative site 2avy:A1578, See in JSmolClick on the image to toggle views Site type: Pout·Rout Schematic drawing for Pout·Rout List of all 142 Mg2+ binding sites with the site type Pout·Rout 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 6 of 6 | « Previous | Next » | 1 | 2 | 3 | 4 | 5 | 6

Mg2+ ion Site type Validation parameters PDB ID Mg2+ ID Coordination Number Qv # Qs # Qe # benchmark dataset 4qcp A3664 Pout·Rout 2   0.25   0.28   0.71 no 4qcr A3794 Pout·Rout 3   0.38   0.40   0.59 no 4qcr A3517 Pout·Rout 2   0.25   0.98   0.84 no 4qcr A3329 Pout·Rout 2   0.25   0.30   0.84 no 4qct A3590 Pout·Rout 2   0.25   0.30   0.78 no 4qct A3506 Pout·Rout 1   0.12  0   0.77 no 4qct A3606 Pout·Rout 2   0.25   0.31   0.86 no 4qcv A3448 Pout·Rout 1   0.12  0   0.41 no 4qcv A3418 Pout·Rout 2   0.25   0.30   0.43 no 4qcv A3322 Pout·Rout 2   0.25   0.28   0.70 no 4qcx A3551 Pout·Rout 1   0.12  0   0.85 no 4qcy A3141 Pout·Rout 4   0.49   0.65   0.91 no 4qcz A3684 Pout·Rout 1   0.12  0   0.53 no 4qcz 0102 Pout·Rout 2   0.25   0.31   0.56 no 4qd1 A3580 Pout·Rout 2   0.25   0.29   0.77 no 4tp3 A3016 Pout·Rout 6   0.74   0.99   0.80 yes 4tpb A3016 Pout·Rout 6   0.74   0.99   0.94 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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Developed by Heping Zheng and Ivan Shabalin at Minor lab (http://olenka.med.virginia.edu/CrystUVa/)
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