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Design and Synthesis of High‐Affinity Dimeric Inhibitors Targeting the Interactions between Gephyrin and Inhibitory Neurotransmitter Receptors
Author(s) -
Maric Hans Michael,
Kasaragod Vikram Babu,
HaugaardKedström Linda,
Hausrat Torben Johann,
Kneussel Matthias,
Schindelin Hermann,
Strømgaard Kristian
Publication year - 2015
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201409043
Subject(s) - gephyrin , receptor , inhibitory postsynaptic potential , scaffold protein , chemistry , neurotransmitter receptor , biophysics , dimer , biochemistry , glycine receptor , amino acid , neuroscience , biology , signal transduction , glycine , organic chemistry
Abstract Gephyrin is the central scaffolding protein for inhibitory neurotransmitter receptors in the brain. Here we describe the development of dimeric peptides that inhibit the interaction between gephyrin and these receptors, a process which is fundamental to numerous synaptic functions and diseases of the brain. We first identified receptor‐derived minimal gephyrin‐binding peptides that displayed exclusive binding towards native gephyrin from brain lysates. We then designed and synthesized a series of dimeric ligands, which led to a remarkable 1220‐fold enhancement of the gephyrin affinity ( K D =6.8 n M ). In X‐ray crystal structures we visualized the simultaneous dimer‐to‐dimer binding in atomic detail, revealing compound‐specific binding modes. Thus, we defined the molecular basis of the affinity‐enhancing effect of multivalent gephyrin inhibitors and provide conceptually novel compounds with therapeutic potential, which will allow further elucidation of the gephyrin–receptor interplay.