MgRNA: Classification of Mg2+ binding sites in RNA crystal structures Back to Classification Home Download this subset in: CSV, XML, JSON List of Mg2+ binding sites in structure 4tp9 4TP9 (2.8Å) -- RIBOSOME : Crystal structure of the e. coli ribosome bound to dalfopristin and quinupristin. this file contains the 50s subunit of the first 70s ribosome with dalfopristin and quinupristin bound. List of all 194 Mg2+ binding sites in the PDB structure 4tp9 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 #", "Site type" or "Mg2+ ID" Page 1 of 10 | « Previous | Next » | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9

Mg2+ ion Site type Validation parameters PDB ID Mg2+ ID Coordination Number Qv # Qs # Qe # benchmark dataset 4tp9 A3115 Ob 5   0.74   0.72   0.89 yes 4tp9 A3090 Ob 6   0.87   0.89   0.86 yes 4tp9 A3023 Ob 6   0.97   0.94   0.34 no 4tp9 B202 Ob 6   0.95   0.96   0.19 no 4tp9 A3102 Ob 6   0.91   0.93   0.57 yes 4tp9 A3178 Ob 1   0.02  0   0.06 no 4tp9 A3073 Ob 6   0.91   0.92   0.51 yes 4tp9 A3133 Ob 6   0.83   0.82   0.86 yes 4tp9 A3141 Nb 1   0.01  0   0.34 no 4tp9 A3140 Nb 1   0.05  0  0 no 4tp9 A3124 2Or 5   0.55   0.51   0.69 no 4tp9 A3174 2Ob 2   0.03   0.16   0.82 no 4tp9 A3046 2Nb 6   0.87   0.85   0.82 yes 4tp9 A3021 2Nb 6   0.92   0.93   0.30 no 4tp9 A3153 Oph 1   0.03  0   0.88 no 4tp9 A3139 Oph 1   0.07  0  0 no 4tp9 A3193 Oph 1   0.08  0   0.78 no 4tp9 A3175 Oph 1   0.07  0   0.96 no 4tp9 A3154 Oph 1   0.05  0   0.43 no 4tp9 A3079 Oph 6   0.88   0.90   0.96 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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