Ligand Expo Downloads

Chemical component dictionaries

• mmCIF format dictionary (text | gzip)
• mmCIF format variants dictionary (text | gzip)
• SDF/MOL format file of dictionary ideal geometries (gzip)
• PDBML format dictionary (tar.gz)
• PDBML format variants dictionary (tar.gz)

SMILES/InChI data files:

• SMILES (OpenEye with stereo) (tab delimited text)
• SMILES (OpenEye) (tab delimited text)
• SMILES (CACTVS with stereo) (tab delimited text)
• SMILES (CACTVS) (tab delimited text)
• InChI (tab delimited text)
• InChIKey (tab delimited text)

Chemical component coordinate data files¹:

• Experimental coordinates for non-polymer molecules and non-standard amino acids and nucleotides are bundled in single data files (SDF and mmCIF) or tar file bundles (PDB and PDBML/XML)
  (SDF/MOL (gz) (>45MB) | mmCIF (gz) (>98MB) | PDBML/XML (tar.gz) (>160MB) | PDB (tar.gz) (>104MB) )

Downloading experimental coordinates for a particular chemical component¹:

Since all chemical component dictionary entries follow a specific naming convention, you can easily skip searching and download the coordinates by entering the correct URL. The URL template is:

• http://ligand-expo.rcsb.org/files/<HASH>/<CC_ID>/<FORMAT>/

  where:

  <HASH>

  is the first character of the component identifier code,

  <CC_ID>

  is the 3-letter-code component identifier,

  <FORMAT>

  is one of icif, isdf, ipdb, ixml, or ccif for mmCIF, SDF/MOL, PDB, PDBML/XML, or mmCIF definition formats, respectively.

  For example, all experimental coordinate files in SDF/MOL format for ATP can be found in the URL:

  http://ligand-expo.rcsb.org/files/A/ATP/isdf/

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[1] Notes of files names: to uniquely identity experimental coordinate files the following underscore delimited coding scheme has been used:

PDB ID _ Component ID _ Model No. _ Chain ID _ Residue No. _ mmCIF Sequence No. _ mmCIF Asym ID _ Disorder Flag _

For example, the file name: 1pk8_ATP_1_B_801__R_D_.icif

Identifier	Value
PDB ID	1PK8
Component/residue code	ATP
Model number	1 (default)
Chain ID	B
Residue number	801
mmCIF sequence number	not applicable
mmCIF Asym ID	R
Disorder Flag	D (modeled with disorder)

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