A Portal for Three-dimensional Structural Information about Nucleic Acids
As of 20-Oct-2021 number of released structures: 11724
Search for released structures

NDB data is updated weekly each Wednesday. You can find the current update date listed above (website header).

Download Data from FTP Server

Download NDB ID to PDB ID mapping (tsv format)

Download NDB structure annotations (tsv format)

Download NDB protein entity annotations (tsv format)

Coordinate Files

  • na-biol. Coordinate files (PDB format) for one biological assembly of nucleic acid-containing structures determined by x-ray crystallography.
  • na-deposited. Coordinate files (PDB format) for the asymmetric unit of nucleic acid-containing structures determined by x-ray crystallography. The chirality has been corrected for these structures.
  • na-mmcif. Coordinate files (mmCIF format) for the asymmetric unit of nucleic acid-containing structures determined by x-ray crystallography in mmCIF format.
  • na-nmr. Copies of the coordinate files released by the PDB for nucleic acid-containing structures determined by NMR.
  • na-nmr-mmcif. Coordinate files (mmCIF format) for nucleic acid-containing structures determined by NMR in mmCIF format.
  • na-obsolete. Coordinate files (PDB format) for structures that have been obsolete or replaced.
  • NDB only. Files for structures that are present only in NDB and not in PDB.


Experimental Data