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Gautier C, Dufour E, Dupré C, Lizzo G, Caignard S, Riest-Fery I, Brasseur C, Legros C, Delagrange P, Nosjean O, Simonneaux V, Boutin JA, Guenin SP. Hamster Melatonin Receptors: Cloning and Binding Characterization of MT₁ and Attempt to Clone MT₂. Int J Mol Sci 2018; 19:E1957. [PMID: 29973510 PMCID: PMC6073278 DOI: 10.3390/ijms19071957] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2018] [Revised: 06/27/2018] [Accepted: 07/02/2018] [Indexed: 12/17/2022] Open
Abstract
For many years, it was of interest to identify the sequences encoding the two melatonin receptors (MT₁ and MT₂) from various species. After publishing the basic molecular characterization of the human, rat, mouse, sheep, and platypus MT₁, MT₂, or Mel1c receptors, we began cloning the genes from other animals, such as birds, bats, and vipers. The goal was to advance the receptor crystallization, which could greatly contribute the understanding of the sequence/stability relationship. European hamster MT₁ receptor was cloned for the first time from this gender, was expressed in stable form in cells, and its binding characterized with a sample of 19 melatonin ligands. Siberian hamster (Phodopus sungorus) expresses a non-functional MT₂. We observed that unlike this hamster, the European hamster (Cricetus cricetus) does not have a stop codon in the MT₂ sequence. Thus, we undertook the tedious task of cloning the MT₂ receptor. We partially succeeded, sequencing the complete exon 2 and a fragment of exon 1 (from putative amino acids 12 to 38 and 77 to 323), after several years of efforts. In order to show that the protein parts we cloned were capable to sustain some binding capacities, we designed a chimeric MT₂ receptor using a consensus sequence to replace the unknown amino acids, based on other small rodent MT₂ sequences. This chimeric construct could bind melatonin in the nanomolar range. This work is meant to be the basis for attempts from other laboratories of the community to determine the complete natural sequence of the European hamster MT₂ receptor. The present work is the first to show that, among the hamsters, if the Siberian is a natural knockout for MT₂, the European one is not.
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Affiliation(s)
- Célia Gautier
- PEX Biotechnologie Chimie & Biologie, Institut de Recherches Servier, 78290 Croissy sur Seine, France.
- Institut des Neurosciences Cellulaires et Intégratives, 67084 Strasbourg, France.
| | - Emilie Dufour
- PEX Biotechnologie Chimie & Biologie, Institut de Recherches Servier, 78290 Croissy sur Seine, France.
| | - Clémence Dupré
- PEX Biotechnologie Chimie & Biologie, Institut de Recherches Servier, 78290 Croissy sur Seine, France.
| | - Giulia Lizzo
- PEX Biotechnologie Chimie & Biologie, Institut de Recherches Servier, 78290 Croissy sur Seine, France.
| | - Sarah Caignard
- PEX Biotechnologie Chimie & Biologie, Institut de Recherches Servier, 78290 Croissy sur Seine, France.
| | - Isabelle Riest-Fery
- PEX Biotechnologie Chimie & Biologie, Institut de Recherches Servier, 78290 Croissy sur Seine, France.
| | - Chantal Brasseur
- PEX Biotechnologie Chimie & Biologie, Institut de Recherches Servier, 78290 Croissy sur Seine, France.
| | - Céline Legros
- PEX Biotechnologie Chimie & Biologie, Institut de Recherches Servier, 78290 Croissy sur Seine, France.
| | - Philippe Delagrange
- PEX Biotechnologie Chimie & Biologie, Institut de Recherches Servier, 78290 Croissy sur Seine, France.
| | - Olivier Nosjean
- PEX Biotechnologie Chimie & Biologie, Institut de Recherches Servier, 78290 Croissy sur Seine, France.
- Institut de Recherches Internationales Servier, 92150 Suresnes, France.
| | - Valérie Simonneaux
- Institut des Neurosciences Cellulaires et Intégratives, 67084 Strasbourg, France.
| | - Jean A Boutin
- PEX Biotechnologie Chimie & Biologie, Institut de Recherches Servier, 78290 Croissy sur Seine, France.
- Institut de Recherches Internationales Servier, 92150 Suresnes, France.
| | - Sophie-Pénélope Guenin
- PEX Biotechnologie Chimie & Biologie, Institut de Recherches Servier, 78290 Croissy sur Seine, France.
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