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 3oi3 3OI3 (3.1Å) -- RIBOSOME/ANTIBIOTIC : Structure of the thermus thermophilus 70s ribosome complexed with telithromycin. this file contains the 50s subunit of one 70s ribosome. the entire crystal structure contains two 70s ribosomes. List of all 372 Mg2+ binding sites in the PDB structure 3oi3 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 9 of 19 | « Previous | Next » | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13

Mg2+ ion Site type Validation parameters PDB ID Mg2+ ID Coordination Number Qv # Qs # Qe # benchmark dataset 3oi3 B312 other RNA-inner types 3   0.09   0.62   0.72 no 3oi3 A3115 other RNA-inner types 4   0.12   0.68   0.62 no 3oi3 A3236 other RNA-inner types 4   0.12   0.75   0.99 no 3oi3 A273 other RNA-inner types 3   0.13   0.27   0.62 no 3oi3 A3166 other RNA-inner types 4   0.10   0.37   0.79 no 3oi3 A3113 other RNA-inner types 3   0.11   0.30   0.79 no 3oi3 A3150 other RNA-inner types 4   0.12   0.56   0.77 no 3oi3 A2993 trans,cis-4Oph 4   0.31   0.56   0.33 no 3oi3 A2968 trans,cis-4Oph 4   0.46   0.50   0.82 no 3oi3 A3103 fac-3Oph·Ob 4   0.63   0.50   0.55 no 3oi3 A3152 mer-3Oph·Or 4   0.25   0.61   0.65 no 3oi3 A2931 mer-3Oph 3   0.38   0.59   0.75 no 3oi3 A3037 mer-3Oph 3   0.43   0.51   0.60 no 3oi3 A2971 fac-3Oph 3   0.20   0.23   0.71 no 3oi3 A2967 fac-3Oph 3   0.29   0.60   0.70 no 3oi3 A2966 fac-3Oph 3   0.26   0.23   0.99 no 3oi3 A2919 fac-3Oph 3   0.20   0.23   0.76 no 3oi3 A2917 fac-3Oph 3   0.20   0.17   0.90 no 3oi3 A3079 fac-3Oph 3   0.08   0.48   0.76 no 3oi3 A2963 fac-3Oph 3   0.23   0.23   0.93 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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