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 17 of 67 | « Previous | Next » | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21

Mg2+ ion Site type Validation parameters PDB ID Mg2+ ID Coordination Number Qv # Qs # Qe # benchmark dataset 3uz6 A1800 2Ob 2   0.05   0.19   0.80 no 4qct A3039 2Ob 2   0.04   0.23   0.97 no 4byc A3933 2Ob 2   0.04   0.19   0.66 no 3sfs A1576 2Ob 2   0.06   0.11   0.56 no 3uyd A1824 2Ob 2   0.09   0.19   0.82 no 4dv6 A1641 2Ob 4   0.36   0.39   0.59 no 4aqy A2584 2Ob 2   0.03   0.15   0.88 no 4btd A3909 2Ob 2   0.06   0.18   0.64 no 1w2b 03954 2Ob 4   0.14   0.84   0.96 no 3v27 A3041 2Ob 2   0.04   0.16   0.85 no 1vvx A1643 2Ob 2   0.13   0.15   0.56 no 4dv2 A1642 2Ob 4   0.36   0.41   0.64 no 3cxc 08042 2Ob 6   0.21   0.63   0.87 no 3v29 A3043 2Ob 2   0.03   0.15   0.86 no 3sfs A1579 2Ob 2   0.04   0.15   0.71 no 2qex 08042 2Ob 6   0.26   0.88   0.99 no 3huy A1575 2Ob 2   0.06   0.16   0.45 no 1q82 A8042 2Ob 6   0.30   0.86   1.00 no 1q7y A8042 2Ob 5   0.14   0.75   0.55 no 2otl 08042 2Ob 6   0.25   0.96   1.00 no 1s72 08042 2Ob 6   0.34   0.94   0.93 no 1q86 A8042 2Ob 6   0.25   0.90   0.95 no 1nji A8042 2Ob 6   0.35   0.81   0.86 no 1qvg 08042 2Ob 6   0.25   0.84   0.58 no 3v2d A3638 2Ob 5   0.27   0.64   0.89 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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