Oligonucleotides, data sources

The crystal structures of 9-substituted adenines confirm the 6-amino structure. Specific stacking patterns are found in crystals of purine derivatives which are also observed for nucleosides, mono- and oligonucleotides. For X-ray results on tautomerism see Table 2 (p 309). Other sources of X-ray data are given in Table 6. 

The spatial arrangement of solute heavy atoms of biological molecules is available from a wide variety of sources, especially those from X-ray crystallography. The Brookhaven Protein Data Bank (PDB) contains over 600 sets of coordinates for proteins, and NDB contains over 200 crystal structures of oligonucleotides. X-ray crystal structures of protein—DNA complexes are also available from both sources. Increasingly, solution structures of DNA and protein, solved by NMR spectroscopy, are becoming available. Structures of canonical DNA can also be derived by means of fiber diffraction data. ... 

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