Hexahydrated magnesium ions bind in the deep major groove and at the outer mouth of A-form nucleic acid duplexes.
Robinson, H., Gao, Y.G., Sanishvili, R., Joachimiak, A., Wang, A.H.(2000) Nucleic Acids Res 28: 1760-1766
- PubMed: 10734195 
- DOI: 10.1093/nar/28.8.1760
- Primary Citation of Related Structures:  
1DNO, 1DNT, 1DNX, 1DNZ - PubMed Abstract: 
Magnesium ions play important roles in the structure and function of nucleic acids. Whereas the tertiary folding of RNA often requires magnesium ions binding to tight places where phosphates are clustered, the molecular basis of the interactions of magnesium ions with RNA helical regions is less well understood ...