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Ki Database Tutorial

Browse Ki in NIF
For more information, visit Ki Homepage or the NeuroLex entry for Ki

The Ki Database is part of the Psychoactive Drug Screening Program at the NIMH and is a vast store of Ki (affinity) values, with related papers.

Running queries for receptors or ligands can therefore access the data. 

Below we query for the muscarinic antagonist scopolamine:


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Data from the federated databases includes 266 records for this search and these include the Ki database under the general category Data Type: Drugs


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Data in this database include the receptor and ligand information, as well as the Ki value for these, in this case scopolamine is only a ligand, but a query for glutamate will bring back any receptors or ligands that include the word.  To alleviate this problem we can sort by either ligand or receptor.

The LigandSMILES field shows the chemical structure of the molecule.  To get more information on any of these, you can click on the Ki Search Page in the Link column, then type in the Hot Ligand from the NIF table, for example, in the proper field.  Then you can look through the results for the entry that is in the table.

The KiNote column is a modifier for the Ki column, in cases where a Ki value in nM is smaller than a threshold or larger than a threshold the < or > signs denote greater than or smaller than.

Most of the Ki values come from competition assays and the assay Hot-ligand is listed as well as the species, structure and the reference to the paper.


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For more information, please visit the Ki Database.

NIF Statistics



NIF Version: 5.0

Ontology Version: 2.5

Level 2.5/3.0 Resources: 889

Registry Entries: 6,339

Total Records: 356,197,652





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