MgRNA: Classification of Mg2+ binding sites in RNA crystal structures

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Representative site 4ji6:A1916, See in JSmolMgRNA representative site for type PO-2RO-BO      Click on the image to toggle views

Site type: Pout·2Rout·Bout

Schematic drawing for

MgRNA type PO-2RO-BO
List of all 3 Mg2+ binding sites with the site type Pout·2Rout·Bout in RNA crystal structures in the benchmark dataset (switch to full dataset)
Sites in the table can be ordered by the following fields by clicking the column header: "PDB ID" or "Mg2+ ID"
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Mg2+ ion Site type Inner-sphere ligands Outer-sphere ligands
PDB ID Mg2+ ID Oph Or Ob+Nb Water Other Pout Rout Bout
3i1t A2931 Pout·2Rout·Bout A3171, A3172, A3173, A3174, A3175 A:A204 G:A799, A:A203 A:A191
4ji6 A1916 Pout·2Rout·Bout A3111, A3112, A3113, A3114, A3115, A3116 G:A799 G:A698, C:A699 G:A698
4nxn A1710 Pout·2Rout·Bout A2108, A2109, A2110, A2111 A:A1004 G:A1024, U:A1025 G:A1024

Site type used in the classification is a string abbreviation of ligand composition in Mg2+ coordination sphere
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].

Developed by Heping Zheng and Ivan Shabalin at Minor lab (http://olenka.med.virginia.edu/CrystUVa/)
For any help please contact <dust@iwonka.med.virginia.edu>