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 3ofd 3OFD (3.19Å) -- RIBOSOME : Crystal structure of the e. coli ribosome bound to chloramphenicol. this file contains the 50s subunit of the second 70s ribosome. List of all 137 Mg2+ binding sites in the PDB structure 3ofd 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 6 of 7 | « Previous | Next » | 1 | 2 | 3 | 4 | 5 | 6 | 7

Mg2+ ion Site type Validation parameters PDB ID Mg2+ ID Coordination Number Qv # Qs # Qe # benchmark dataset 3ofd A2930 Oph 6   0.83   0.84   0.46 no 3ofd A2914 Oph 6   0.83   0.83   0.39 no 3ofd A2931 Oph·Pout 6   0.84   0.83   0.54 yes 3ofd A3009 Oph·4Pout 6   0.84   0.83   0.82 yes 3ofd A2953 Oph·3Pout 6   0.84   0.83   0.89 yes 3ofd A2980 Oph·2Pout 6   0.84   0.83   0.67 yes 3ofd B590 Ob 6   0.84   0.82   1.00 yes 3ofd A3019 Oph·3Pout 6   0.84   0.85   0.92 yes 3ofd A2972 Oph·2Pout 6   0.85   0.84   0.43 no 3ofd A2938 Oph·3Pout 6   0.85   0.84   0.57 yes 3ofd A2909 Oph 6   0.85   0.85   0.74 yes 3ofd A2940 Oph 6   0.85   0.84   0.69 yes 3ofd A3032 Ob 6   0.85   0.83   0.91 yes 3ofd A2995 Oph·Pout 6   0.85   0.84   0.58 yes 3ofd A2947 Oph·4Pout 6   0.85   0.85   0.78 yes 3ofd A2959 Oph·Pout 6   0.85   0.86   0.80 yes 3ofd A2992 Oph·Pout 6   0.85   0.85   0.75 yes 3ofd A3025 Oph·2Pout 6   0.85   0.84   0.57 yes 3ofd A2941 Oph·2Pout 6   0.85   0.85   0.46 no 3ofd A2970 Oph·3Pout 6   0.85   0.84   0.83 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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