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ChemMedChem. 2015 Apr;10(4):662-87. doi: 10.1002/cmdc.201402490. Epub 2015 Mar 10.

Functionalization of fluorinated benzenesulfonamides and their inhibitory properties toward carbonic anhydrases.

Author information

1
Department of Biothermodynamics and Drug Design, Institute of Biotechnology, Vilnius University, Graičiūno 8, Vilnius 02241 (Lithuania).

Abstract

Substituted tri- and tetrafluorobenzenesulfonamides were designed, synthesized, and evaluated as high-affinity and isoform-selective carbonic anhydrase (CA) inhibitors. Their binding affinities for recombinant human CA I, II, VA, VI, VII, XII, and XIII catalytic domains were determined by fluorescent thermal shift assay, isothermal titration calorimetry, and a stopped-flow CO2 hydration assay. Variation of the substituents at the 2-, 3-, and 4-positions yielded compounds with a broad range of binding affinities and isoform selectivities. Several 2,4-substituted-3,5,6-trifluorobenzenesulfonamides were effective CA XIII inhibitors with high selectivity over off-target CA I and CA II. 3,4-Disubstituted-2,5,6-trifluorobenzenesulfonamides bound CAs with higher affinity than 2,4-disubstituted-3,5,6-trifluorobenzenesulfonamides. Many such fluorinated benzenesulfonamides were found to be nanomolar inhibitors of CA II, CA VII, tumor-associated CA IX and CA XII, and CA XIII. X-ray crystal structures of inhibitors bound in the active sites of several CA isoforms provide structure-activity relationship information for inhibitor binding affinities and selectivity.

KEYWORDS:

X-ray crystallography; carbonic anhydrases; fluorescent thermal shift assay; fluorinated benzenesulfonamides; isothermal titration calorimetry; thermofluor

PMID:
25758852
DOI:
10.1002/cmdc.201402490
[Indexed for MEDLINE]

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