Rational Design of Nanobody80 Loop Peptidomimetics: Towards Biased β Adrenergic Receptor Ligands.

TitleRational Design of Nanobody80 Loop Peptidomimetics: Towards Biased β Adrenergic Receptor Ligands.
Publication TypeJournal Article
Year of Publication2017
AuthorsMartin, C., S. L. C. Moors, M. Danielsen, C. Betti, C. Fabris, D. Sejer Pedersen, E. Pardon, M. Peyressatre, K. Fehér, J. C. Martins, J. Mosolff Mathiesen, M. C. Morris, N. Devoogdt, V. Caveliers, F. De Proft, J. Steyaert, and S. Ballet
JournalChemistry
Volume23
Issue40
Pagination9632-9640
Date Published2017 Jul 18
ISSN1521-3765
Abstract

G protein-coupled receptors (GPCRs) play an important role in many cellular responses; as such, their mechanism of action is of utmost interest. To gain insight into the active conformation of GPCRs, the X-ray crystal structures of nanobody (Nb)-stabilized β -adrenergic receptor (β AR) have been reported. Nb80, in particular, is able to bind the intracellular G protein binding site of β AR and stabilize the receptor in an active conformation. Within Nb80, the complementarity-determining region 3 (CDR3) is responsible for most of the binding interactions. Hence, we hypothesized that peptidomimetics of the CDR3 loop might be sufficient for binding to the receptor, inhibiting the interaction of β AR with intracellular GPCR interacting proteins (e.g., G proteins). Based on previous crystallographic data, a set of peptidomimetics were synthesized that, similar to the Nb80 CDR3 loop, adopt a β-hairpin conformation. Syntheses, conformational analysis, binding and functional in vitro assays, as well as internalization experiments, were performed. We demonstrate that peptidomimetics can structurally mimic the CDR3 loop of a nanobody and its function by inhibiting G protein coupling as measured by partial inhibition of cAMP production.

DOI10.1002/chem.201701321
Alternate JournalChemistry
PubMed ID28449310
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