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 4m2z 4M2Z (2.85Å) -- HYDROLASE/RNA : Crystal structure of rnase iii complexed with double-stranded rna and cmp (type ii cleavage) List of all 4 Mg2+ binding sites in the PDB structure 4m2z in the benchmark dataset (switch to full dataset) Sites in the table can be ordered by the following fields by clicking the column header: "Site type" or "Mg2+ ID" Page 1 of 1

Mg2+ ion Site type Inner-sphere ligands Outer-sphere ligands PDB ID Mg2+ ID Oph Or Ob+Nb Water Other Pout Rout Bout 4m2z C101 Oph·Pout A:C2(OP1) A606, C204, C205 C:C103 4m2z D101 Oph·Pout A:D2(OP1) B403, D207, D208 C:D103 4m2z A501 Mg2+ bound by non-RNA C:C103(OP1) G:D28(O3') A601, D205 ASP:A44(OD2), GLU:A110(OE1) 4m2z B301 Mg2+ bound by non-RNA C:D103(OP1) G:C28(O3') B402, D206 ASP:B44(OD2), GLU:B110(OE2)

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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