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 3oi5 3OI5 (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 328 Mg2+ binding sites in the PDB structure 3oi5 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 4 of 17 | « 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 3oi5 A3130 other RNA-inner types 3   0.08   0.55   0.67 no 3oi5 A3144 poly-nuclear Mg2+ site 1   0.04  0   0.67 no 3oi5 A2914 other RNA-inner types 3   0.07   0.25   0.68 no 3oi5 A3021 cis-2Oph 2   0.29   0.50   0.68 no 3oi5 A3143 other RNA-inner types 5   0.22   0.73   0.68 no 3oi5 A2967 mer-3Oph 3   0.14   0.80   0.68 no 3oi5 A2926 Mg2+ not bound by RNA 0  0  0   0.68 no 3oi5 A3043 cis-2Oph 2   0.12   0.14   0.69 no 3oi5 A3051 2Or 2   0.03   0.12   0.69 no 3oi5 A3150 Oph 1   0.02  0   0.69 no 3oi5 A3065 Mg2+ not bound by RNA 0  0  0   0.69 no 3oi5 A277 Mg2+ not bound by RNA 0  0  0   0.69 no 3oi5 A3049 Mg2+ not bound by RNA 0  0  0   0.69 no 3oi5 A2983 Oph 1   0.13  0   0.70 no 3oi5 A2950 cis-2Oph 2   0.07   0.12   0.70 no 3oi5 A91 Oph 1   0.05  0   0.70 no 3oi5 D278 Mg2+ not bound by RNA 1   0.02  0   0.70 no 3oi5 A3042 Oph 1   0.08  0   0.70 no 3oi5 A3103 cis-2Oph 2   0.12   0.20   0.71 no 3oi5 A3019 cis-2Oph 2   0.15   0.13   0.71 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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