quisinostat   Click here for help

GtoPdb Ligand ID: 7503

Synonyms: JNJ-26481585
PDB Ligand Antimalarial Ligand
Compound class: Synthetic organic
Comment: Quisinostat is an HDAC inhibitor. The compound has highest potency for HDAC1 and modest potency with HDACs 2, 4, 10, and 11. Quisinostat exhibits >30-fold selectivity against HDACs 3, 5, 8, and 9, with lowest potency for HDACs 6 and 7 [1].

The compound also has antimalarial activity [2]. The Malaria tab on this ligand page provides additional curator comments of relevance to the Guide to MALARIA PHARMACOLOGY.
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Ligand Activity Visualisation Charts

These are box plot that provide a unique visualisation, summarising all the activity data for a ligand taken from ChEMBL and GtoPdb across multiple targets and species. Click on a plot to see the median, interquartile range, low and high data points. A value of zero indicates that no data are available. A separate chart is created for each target, and where possible the algorithm tries to merge ChEMBL and GtoPdb targets by matching them on name and UniProt accession, for each available species. However, please note that inconsistency in naming of targets may lead to data for the same target being reported across multiple charts.

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View interactive charts of activity data across species
2D Structure
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2D Structure

An image of the ligand's 2D structure. For small molecules with SMILES these are drawn using the NCI/CADD Chemical Identifier Resolver. Click on the image to access the chemical structure search tool with the ligand pre-loaded in the structure editor. For other types of ligands, e.g. longer nucleotides and peptides, a manually drawn representation of the molecule may be provided.

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Physico-chemical Properties
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Physico-chemical Properties

Calculated molecular properties are available for small molecules and natural products (not peptides). Properties were generated using the CDK toolkit. All properties were selected to enable the prediction of the Lipinski Rule-of-Five profile or ‘druglikeness’ for each ligand. For more info on each category see the help pages.

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Hydrogen bond acceptors 5
Hydrogen bond donors 3
Rotatable bonds 7
Topological polar surface area 95.31
Molecular weight 394.21
XLogP 2.23
No. Lipinski's rules broken 0
SMILES / InChI / InChIKey
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SMILES / InChI / InChIKey

SMILES (Simplified Molecular Input Line Entry Specification) A specification for unambiguously describing the structure of chemical molecules using short ASCII strings. Canonical SMILES specify a unique representation of the 2D structure without chiral or isotopic specifications. Isomeric SMILES include chiral specification and isotopes.

Standard InChI (IUPAC International Chemical Identifier) and InChIKey InChI is a non-proprietary, standard, textual identifier for chemical substances designed to facilitate linking of information and database searching. An InChIKey is a simplified version of a full InChI, designed for easier web searching.

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Canonical SMILES ONC(=O)c1cnc(nc1)N1CCC(CC1)CNCc1cn(c2c1cccc2)C
Isomeric SMILES ONC(=O)c1cnc(nc1)N1CCC(CC1)CNCc1cn(c2c1cccc2)C
InChI InChI=1S/C21H26N6O2/c1-26-14-17(18-4-2-3-5-19(18)26)11-22-10-15-6-8-27(9-7-15)21-23-12-16(13-24-21)20(28)25-29/h2-5,12-15,22,29H,6-11H2,1H3,(H,25,28)
InChI Key PAWIYAYFNXQGAP-UHFFFAOYSA-N
Guide to Malaria Pharmacology Comments
Quisinostat emerged as the most potent antimalarial compound from a phenotypic screen of a library of epigenetic inhibitors [2]. The use of quisinostat as an antimalarial therapy is precluded due to toxicity concerns but it has guided structural optimization studies that have identified promising antimalarial candidates JX21108 [2] and JX35 [5].

Potential Target/Mechanism Of Action: quisinostat is an HDAC inhibitor but we have been unable to find selective affinity data for Plasmodium HDACs. PfHDAC1 is the only Plasmodium HDAC included in the database at present and has been tagged as the target for this ligand for data retrieval purposes.