SS-208   Click here for help

GtoPdb Ligand ID: 10490

Synonyms: compound 7b [PMID: 31414801] | SS208
PDB Ligand Immunopharmacology Ligand
Compound class: Synthetic organic
Comment: SS-208 is reported as an isotype selective inhibitor of histone deacetylase 6 (HDAC6) [2]. It has been developed for potential to treat advanced melanoma. SS-208 has been designed to provide improved HDAC6 selectivity compared to ricolinostat and citarinostat which both exhibit unfavourable levels of HDAC1 inhibition.
Selective pharmacological inhibition or genetic abrogation of HDAC6 modulates immune checkpoint activity by downregulating the expression of PD-L1 via the recruitment and activation of STAT3 [1]. The antitumour activity of SS-208 in vivo is primarily mediated by activation of immune cells and an anti-tumour immune response in the tumour microenvironment.
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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 3
Hydrogen bond donors 3
Rotatable bonds 7
Topological polar surface area 104.46
Molecular weight 343.01
XLogP 2.16
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)c1noc(c1)CCNC(=O)c1ccc(c(c1)Cl)Cl
Isomeric SMILES ONC(=O)c1noc(c1)CCNC(=O)c1ccc(c(c1)Cl)Cl
InChI InChI=1S/C13H11Cl2N3O4/c14-9-2-1-7(5-10(9)15)12(19)16-4-3-8-6-11(18-22-8)13(20)17-21/h1-2,5-6,21H,3-4H2,(H,16,19)(H,17,20)
InChI Key JFGOILLZIAIYGA-UHFFFAOYSA-N
Immunopharmacology Comments
We have included SS-208 in the GtoImmPdb as its in vivo antitumour activity is primarily mediated by activation of immune cells and an anti-tumour immune response in the tumour microenvironment. Its mechanism of action involves modulation of immune checkpoint activity (PD-L1), STAT3 transcriptional activity, and activation of cytotoxic T cells which destroy tumour cells [2].