Structure-kinetics relationships of Capadenoson derivatives as adenosine A1 receptor agonists

Eur J Med Chem. 2015 Aug 28:101:681-91. doi: 10.1016/j.ejmech.2015.07.023.

Julien Louvel ¹, Dong Guo ², Marjolein Soethoudt ², Tamara A M Mocking ², Eelke B Lenselink ², Thea Mulder-Krieger ², Laura H Heitman ², Adriaan P IJzerman ²

Affiliations

1 Division of Medicinal Chemistry, Leiden Academic Centre for Drug Research, Leiden University, P.O. Box 9502, 2300 RA Leiden, The Netherlands. Electronic address: j.a.louvel@lacdr.leidenuniv.nl.
2 Division of Medicinal Chemistry, Leiden Academic Centre for Drug Research, Leiden University, P.O. Box 9502, 2300 RA Leiden, The Netherlands.

PMID: 26210506 DOI: 10.1016/j.ejmech.2015.07.023

Abstract

We report the synthesis and biological evaluation of new derivatives of Capadenoson, a former drug candidate that was previously advanced to phase IIa clinical trials. 19 of the 20 ligands show an affinity below 100 nM at the human adenosine A1 receptor (hA1AR) and display a wide range of residence times at this target (from approx. 5 min (compound 10) up to 132 min (compound 5)). Structure-affinity and structure-kinetics relationships were established, and computational studies of a homology model of the hA1AR revealed crucial interactions for both the affinity and dissociation kinetics of this family of ligands. These results were also combined with global metrics (Ligand Efficiency, cLogP), showing the importance of binding kinetics as an additional way to better select a drug candidate amongst seemingly similar leads.

Keywords

Adenosine A(1) receptor; Extracellular loops; Residence time; Structure-affinity relationships; Structure-kinetics relationships.

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