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Deciphering Specificity Determinants for FR900359‐Derived G q α Inhibitors Based on Computational and Structure–Activity Studies
Author(s) -
Reher Raphael,
Kühl Toni,
Annala Suvi,
Benkel Tobias,
Kaufmann Desireé,
Nubbemeyer Britta,
Odhiambo Justin Patrick,
Heimer Pascal,
Bäuml Charlotte Anneke,
Kehraus Stefan,
Crüsemann Max,
Kostenis Evi,
Tietze Daniel,
König Gabriele M.,
Imhof Diana
Publication year - 2018
Publication title -
chemmedchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.817
H-Index - 100
eISSN - 1860-7187
pISSN - 1860-7179
DOI - 10.1002/cmdc.201800304
Subject(s) - chemistry , docking (animal) , computational biology , structure–activity relationship , nuclear magnetic resonance spectroscopy , biochemistry , intracellular , combinatorial chemistry , stereochemistry , biology , in vitro , medicine , nursing
Direct targeting of intracellular Gα subunits of G protein‐coupled receptors by chemical tools is a challenging task in current pharmacological studies and in the development of novel therapeutic approaches. In this study we analyzed novel FR900359‐based analogs from natural sources, synthetic cyclic peptides, as well as all so‐far known G q α inhibitors in a comprehensive study to devise a strategy for the elucidation of characteristics that determine interactions with and inhibition of G q in the specific FR/YM‐binding pocket. Using 2D NMR spectroscopy and molecular docking we identified unique features in the macrocyclic structures responsible for binding to the target protein correlating with inhibitory activity. While all novel compounds were devoid of effects on G i and G s proteins, no inhibitor surpassed the biological activity of FR. This raises the question of whether depsipeptides such as FR already represent valuable chemical tools for specific inhibition of G q and, at the same time, are suitable natural lead structures for the development of novel compounds to target Gα subunits other than G q .