The PDB is constantly improving its descriptions of small molecules. Its Chemical Component Dictionary (formerly called the HET Group Dictionary) is available in PDB and mmCIF formats, and is updated weekly. This resource, created by the curation efforts of the PDB teams at Rutgers University and CARB/NIST, is under active development. A guide to the formats used in the PDB Chemical Component Dictionary is available at deposit.pdb.org/cc_dict_tut.html. This guide provides descriptions and examples of the contents of the PDB and mmCIF format Chemical Component Dictionaries, as well as a description of the contents of entries in the Ligand Depot.
Ligand Depot (ligand-depot.rutgers.edu) has been created as a data warehouse that integrates databases, services, tools, and methods related to small molecules that are bound to macromolecules. It was created to help users explore the PDB Chemical Component Dictionary and the small molecule contents of the PDB. Comments and suggestions on the PDB Chemical Component Dictionary, the format description guide, and Ligand Depot are greatly appreciated, and may be sent to firstname.lastname@example.org.
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