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Serova OV, Gantsova EA, Deyev IE, Petrenko AG. The Value of pH Sensors in Maintaining Homeostasis of the Nervous System. RUSSIAN JOURNAL OF BIOORGANIC CHEMISTRY 2020. [DOI: 10.1134/s1068162020040196] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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Goryashchenko AS, Mozhaev AA, Serova OV, Erokhina TN, Orsa AN, Deyev IE, Petrenko AG. Probing Structure and Function of Alkali Sensor IRR with Monoclonal Antibodies. Biomolecules 2020; 10:E1060. [PMID: 32708676 PMCID: PMC7408431 DOI: 10.3390/biom10071060] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2020] [Revised: 07/06/2020] [Accepted: 07/13/2020] [Indexed: 12/27/2022] Open
Abstract
To study the structure and function of the pH-regulated receptor tyrosine kinase insulin receptor-related receptor (IRR), а member of the insulin receptor family, we obtained six mouse monoclonal antibodies against the recombinant IRR ectodomain. These antibodies were characterized in experiments with exogenously expressed full-length IRR by Western blotting, immunoprecipitation, and immunocytochemistry analyses. Utilizing a previously obtained set of IRR/IR chimeras with swapped small structural domains and point amino acid substitutions, we mapped the binding sites of the obtained antibodies in IRR. Five of them showed specific binding to different IRR domains in the extracellular region, while one failed to react with the full-length receptor. Unexpectedly, we found that 4D5 antibody can activate IRR at neutral pH, and 4C2 antibody can inhibit activation of IRR by alkali. Our study is the first description of the instruments of protein nature that can regulate activity of the orphan receptor IRR and confirms that alkali-induced activation is an intrinsic property of this receptor tyrosine kinase.
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Affiliation(s)
- Alexander S. Goryashchenko
- Laboratory of Receptor Cell Biology, Department of Peptide and Protein Technologies, Shemyakin and Ovchinnikov Institute of Bioorganic Chemistry of Russian Academy of Sciences, 117997 Moscow, Russia; (A.A.M.); (O.V.S.); (A.N.O.); (A.G.P.)
| | - Andrey A. Mozhaev
- Laboratory of Receptor Cell Biology, Department of Peptide and Protein Technologies, Shemyakin and Ovchinnikov Institute of Bioorganic Chemistry of Russian Academy of Sciences, 117997 Moscow, Russia; (A.A.M.); (O.V.S.); (A.N.O.); (A.G.P.)
- Laboratory of Bioorganic Structures, Department of X-ray and Synchrotron Studies, A.V. Shubnikov Institute of Crystallography of Federal Scientific Research Centre “Crystallography and Photonics” of Russian Academy of Sciences, 119333 Moscow, Russia
| | - Oxana V. Serova
- Laboratory of Receptor Cell Biology, Department of Peptide and Protein Technologies, Shemyakin and Ovchinnikov Institute of Bioorganic Chemistry of Russian Academy of Sciences, 117997 Moscow, Russia; (A.A.M.); (O.V.S.); (A.N.O.); (A.G.P.)
| | - Tatiana N. Erokhina
- Laboratory of Molecular Diagnostics, Department of Plant Molecular Biology and Biotechnology, Shemyakin and Ovchinnikov Institute of Bioorganic Chemistry of Russian Academy of Sciences, 117997 Moscow, Russia;
| | - Alexander N. Orsa
- Laboratory of Receptor Cell Biology, Department of Peptide and Protein Technologies, Shemyakin and Ovchinnikov Institute of Bioorganic Chemistry of Russian Academy of Sciences, 117997 Moscow, Russia; (A.A.M.); (O.V.S.); (A.N.O.); (A.G.P.)
| | - Igor E. Deyev
- Group of Molecular Physiology, Department of Peptide and Protein Technologies, Shemyakin and Ovchinnikov Institute of Bioorganic Chemistry of Russian Academy of Sciences, 117997 Moscow, Russia;
| | - Alexander G. Petrenko
- Laboratory of Receptor Cell Biology, Department of Peptide and Protein Technologies, Shemyakin and Ovchinnikov Institute of Bioorganic Chemistry of Russian Academy of Sciences, 117997 Moscow, Russia; (A.A.M.); (O.V.S.); (A.N.O.); (A.G.P.)
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Shtykova EV, Petoukhov MV, Mozhaev AA, Deyev IE, Dadinova LA, Loshkarev NA, Goryashchenko AS, Bocharov EV, Jeffries CM, Svergun DI, Batishchev OV, Petrenko AG. The dimeric ectodomain of the alkali-sensing insulin receptor-related receptor (ectoIRR) has a droplike shape. J Biol Chem 2019; 294:17790-17798. [PMID: 31615897 PMCID: PMC6879334 DOI: 10.1074/jbc.ra119.010390] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2019] [Revised: 10/10/2019] [Indexed: 09/10/2023] Open
Abstract
Insulin receptor-related receptor (IRR) is a receptor tyrosine kinase of the insulin receptor family and functions as an extracellular alkali sensor that controls metabolic alkalosis in the regulation of the acid-base balance. In the present work, we sought to analyze structural features of IRR by comparing them with those of the insulin receptor, which is its closest homolog but does not respond to pH changes. Using small-angle X-ray scattering (SAXS) and atomic force microscopy (AFM), we investigated the overall conformation of the recombinant soluble IRR ectodomain (ectoIRR) at neutral and alkaline pH. In contrast to the well-known inverted U-shaped (or λ-shaped) conformation of the insulin receptor, the structural models reconstructed at different pH values revealed that the ectoIRR organization has a "droplike" shape with a shorter distance between the fibronectin domains of the disulfide-linked dimer subunits within ectoIRR. We detected no large-scale pH-dependent conformational changes of ectoIRR in both SAXS and AFM experiments, an observation that agreed well with previous biochemical and functional analyses of IRR. Our findings indicate that ectoIRR's sensing of alkaline conditions involves additional molecular mechanisms, for example engagement of receptor juxtamembrane regions or the surrounding lipid environment.
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Affiliation(s)
- Eleonora V Shtykova
- A. V. Shubnikov Institute of Crystallography of Federal Scientific Research Centre "Crystallography and Photonics" of Russian Academy of Sciences, Moscow 119333, Russia
| | - Maxim V Petoukhov
- A. V. Shubnikov Institute of Crystallography of Federal Scientific Research Centre "Crystallography and Photonics" of Russian Academy of Sciences, Moscow 119333, Russia
- A. N. Frumkin Institute of Physical Chemistry and Electrochemistry of Russian Academy of Sciences, Moscow 119071, Russia
| | - Andrey A Mozhaev
- A. V. Shubnikov Institute of Crystallography of Federal Scientific Research Centre "Crystallography and Photonics" of Russian Academy of Sciences, Moscow 119333, Russia
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow 117997, Russia
| | - Igor E Deyev
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow 117997, Russia
| | - Liubov A Dadinova
- A. V. Shubnikov Institute of Crystallography of Federal Scientific Research Centre "Crystallography and Photonics" of Russian Academy of Sciences, Moscow 119333, Russia
| | - Nikita A Loshkarev
- A. N. Frumkin Institute of Physical Chemistry and Electrochemistry of Russian Academy of Sciences, Moscow 119071, Russia
- Moscow Institute of Physics and Technology (State University), Dolgoprudny, Moscow Region 141701, Russia
| | - Alexander S Goryashchenko
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow 117997, Russia
| | - Eduard V Bocharov
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow 117997, Russia
- Moscow Institute of Physics and Technology (State University), Dolgoprudny, Moscow Region 141701, Russia
| | - Cy M Jeffries
- European Molecular Biology Laboratory, EMBL Hamburg Unit, 22607 Hamburg, Germany
| | - Dmitri I Svergun
- European Molecular Biology Laboratory, EMBL Hamburg Unit, 22607 Hamburg, Germany
| | - Oleg V Batishchev
- A. N. Frumkin Institute of Physical Chemistry and Electrochemistry of Russian Academy of Sciences, Moscow 119071, Russia
- Moscow Institute of Physics and Technology (State University), Dolgoprudny, Moscow Region 141701, Russia
| | - Alexander G Petrenko
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow 117997, Russia
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