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| Content | |
|---|---|
| Description | Chemicals and their bioassays |
| Organisms | Humans and other animals |
| Contact | |
| Research center | NCBI |
| Primary citation | PMID 15879180 |
| Access | |
| Website | pubchem |
| Download URL | FTP |
| Web service URL | PUG-View[1] |
| Miscellaneous | |
| License | Public domain |
PubChem is adatabase ofchemicalmolecules and their activities againstbiological assays. The system is maintained by theNational Center for Biotechnology Information (NCBI), a component of theNational Library of Medicine, which is part of the United StatesNational Institutes of Health (NIH). PubChem can be accessed for free through aweb user interface. Millions of compound structures and descriptive datasets can be freely downloaded viaFTP. PubChem contains multiple substance descriptions and small molecules with fewer than 100 atoms and 1,000 bonds. More than 80 database vendors contribute to the growing PubChem database.[2]
PubChem was released in 2004 as a component of the Molecular Libraries Program (MLP) of the NIH. As of November 2015, PubChem contains more than 150 million depositor-provided substance descriptions, 60 million unique chemical structures, and 225 million biological activity test results (from over 1 million assay experiments performed on more than 2 million small-molecules covering almost 10,000 unique protein target sequences that correspond to more than 5,000 genes). It also containsRNA interference (RNAi) screening assays that target over 15,000 genes.[3]
As of August 2018, PubChem contains 247.3 million substance descriptions, 96.5 million unique chemical structures, contributed by 629 data sources from 40 countries. It also contains 237 million bioactivity test results from 1.25 million biological assays, covering >10,000 target protein sequences.[4]
As of 2020, with data integration from over 100 new sources, PubChem contains more than 293 million depositor-provided substance descriptions, 111 million unique chemical structures, and 271 million bioactivity data points from 1.2 million biological assays experiments.[5]
PubChem consists of three dynamically growing primary databases. As of 5 November 2020 (number of BioAssays is unchanged):
Searching the databases is possible for a broad range of properties including chemical structure, name fragments,chemical formula,molecular weight,XLogP, andhydrogen bond donor and acceptor count.
PubChem contains its own onlinemolecule editor withSMILES/SMARTS andInChI support that allows the import and export of all commonchemical file formats to search for structures and fragments.
Each hit provides information about synonyms, chemical properties, chemical structure including SMILES and InChI strings, bioactivity, and links to structurally related compounds and other NCBI databases likePubMed.
In the text search form the database fields can be searched by adding the field name in square brackets to the search term. A numeric range is represented by two numbers separated by a colon. The search terms and field names are case-insensitive. Parentheses and thelogical operators AND, OR, and NOT can be used. AND is assumed if no operator is used.
Example (Lipinski's Rule of Five):
0:500[mw] 0:5[hbdc] 0:10[hbac] -5:5[logp]
Identification numbers | ||
| • | Identification number in current database | [UID] |
| • | Substance identification number | [SID] |
| • | Compound identification number | [CID] |
| • | BioAssay identification number | [BAID], [AID] |
General | ||
| • | Any database field | [ALL] |
| • | Comment | [CMT] |
| • | Deposition date | [DDAT], [DEPDAT] |
| • | Depositor's external ID | [SRID], [SRCID] |
| • | Source name | [SRC], [SRCNAM], [SRCNAME] |
| • | Source release date | [SRD], [SRDAT], [RLSDAT] |
| • | Medical Subject Heading (MeSH) term | [MSHT], [MESHT] |
| • | MeSH tree node | [MSHN], [MESHTN] |
| • | MeSH pharmacological actions | [PHMA], [PHARMA] |
Substance properties | ||
| • | Substance synonyms | [SYNO] |
| • | IUPAC name | [UPAC], [IUPAC] |
| • | International Chemical Identifier (InChI) | [INCHI] |
| • | Molecular weight | [MW], [MWT], [MOLWT] |
| • | Chemical elements | [ELMT], [EL] |
| • | Non-Hydrogen atoms | [HAC], [HACNT] |
| • | Isotope count | [IAC], [IACNT] |
| • | Totalformal charge | [TFC], [CHG], [CHRG] |
| • | Chiral atom count | [ACC], [ACCNT] |
| • | Defined chiral atom count | [ACDC], [ACDCNT] |
| • | Undefined chiral atom count | [ACUC], [ACUCNT] |
| • | Hydrogen bond acceptor count | [HBAC], [HBACNT] |
| • | Hydrogen bond donor count | [HBDC], [HBDCNT] |
| • | Tautomer count | [TC], [TCNT], [TTMC] |
| • | Rotatable bond count | [RBC], [RBCNT] |
| • | XLogP[11] | [XLGP], [LOGP] |
Compound properties | ||
| • | Compound synonyms | [CSYN], [CSYNO] |
| • | Component count | [CC], [CCNT] |
| • | Covalent unit (molecule) count | [CUC], [CUCNT] |
| • | Total bioactivity count | [TAC] |
