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Wagdi A, Malan D, Sathyanarayanan U, Beauchamp JS, Vogt M, Zipf D, Beiert T, Mansuroglu B, Dusend V, Meininghaus M, Schneider L, Kalthof B, Wiegert JS, König GM, Kostenis E, Patejdl R, Sasse P, Bruegmann T. Selective optogenetic control of G q signaling using human Neuropsin. Nat Commun 2022; 13:1765. [PMID: 35365606 PMCID: PMC8975936 DOI: 10.1038/s41467-022-29265-w] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2021] [Accepted: 03/03/2022] [Indexed: 01/07/2023] Open
Abstract
Gq proteins are universally important for signal transduction in mammalian cells. The underlying kinetics and transformation from extracellular stimuli into intracellular signaling, however could not be investigated in detail so far. Here we present the human Neuropsin (hOPN5) for specific and repetitive manipulation of Gq signaling in vitro and in vivo with high spatio-temporal resolution. Properties and G protein specificity of hOPN5 are characterized by UV light induced IP3 generation, Ca2+ transients and inhibition of GIRK channel activity in HEK cells. In adult hearts from a transgenic animal model, light increases the spontaneous beating rate. In addition, we demonstrate light induced contractions in the small intestine, which are not detectable after pharmacological Gq protein block. All-optical high-throughput screening for TRPC6 inhibitors is more specific and sensitive than conventional pharmacological screening. Thus, we demonstrate specific Gq signaling of hOPN5 and unveil its potential for optogenetic applications.
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Affiliation(s)
- Ahmed Wagdi
- grid.411984.10000 0001 0482 5331Institute for Cardiovascular Physiology, University Medical Center Göttingen, Göttingen, Germany ,grid.452396.f0000 0004 5937 5237German Center for Cardiovascular Research (DZHK), Partner site Göttingen, Göttingen, Germany ,grid.7450.60000 0001 2364 4210Present Address: Department of Cardiology and Pulmonology, University Medical Center Göttingen, Georg August University of Göttingen, Göttingen, Germany
| | - Daniela Malan
- grid.10388.320000 0001 2240 3300Institute of Physiology I, Medical Faculty, University of Bonn, Bonn, Germany
| | - Udhayabhaskar Sathyanarayanan
- grid.411984.10000 0001 0482 5331Institute for Cardiovascular Physiology, University Medical Center Göttingen, Göttingen, Germany
| | - Janosch S. Beauchamp
- grid.411984.10000 0001 0482 5331Institute for Cardiovascular Physiology, University Medical Center Göttingen, Göttingen, Germany
| | - Markus Vogt
- grid.411984.10000 0001 0482 5331Institute for Cardiovascular Physiology, University Medical Center Göttingen, Göttingen, Germany
| | - David Zipf
- grid.411984.10000 0001 0482 5331Institute for Cardiovascular Physiology, University Medical Center Göttingen, Göttingen, Germany
| | - Thomas Beiert
- grid.15090.3d0000 0000 8786 803XDepartment of Internal Medicine II, University Hospital Bonn, University of Bonn, Bonn, Germany
| | - Berivan Mansuroglu
- grid.10388.320000 0001 2240 3300Institute of Physiology I, Medical Faculty, University of Bonn, Bonn, Germany ,grid.10388.320000 0001 2240 3300Research Training Group 1873, University of Bonn, Bonn, Germany
| | - Vanessa Dusend
- grid.10388.320000 0001 2240 3300Institute of Physiology I, Medical Faculty, University of Bonn, Bonn, Germany ,grid.10388.320000 0001 2240 3300Research Training Group 1873, University of Bonn, Bonn, Germany
| | - Mark Meininghaus
- grid.420044.60000 0004 0374 4101Bayer AG, Research & Development, Pharmaceuticals, 42096 Wuppertal, Germany
| | - Linn Schneider
- grid.420044.60000 0004 0374 4101Bayer AG, Research & Development, Pharmaceuticals, 42096 Wuppertal, Germany
| | - Bernd Kalthof
- grid.420044.60000 0004 0374 4101Bayer AG, Research & Development, Pharmaceuticals, 42096 Wuppertal, Germany
| | - J. Simon Wiegert
- grid.13648.380000 0001 2180 3484Center for Molecular Neurobiology Hamburg, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Gabriele M. König
- grid.10388.320000 0001 2240 3300Molecular, Cellular and Pharmacobiology Section, Institute of Pharmaceutical Biology, University of Bonn, Bonn, Germany
| | - Evi Kostenis
- grid.10388.320000 0001 2240 3300Molecular, Cellular and Pharmacobiology Section, Institute of Pharmaceutical Biology, University of Bonn, Bonn, Germany
| | - Robert Patejdl
- grid.413108.f0000 0000 9737 0454Oscar-Langendorff Institute of Physiology, Rostock University Medical Center, Rostock, Germany
| | - Philipp Sasse
- grid.10388.320000 0001 2240 3300Institute of Physiology I, Medical Faculty, University of Bonn, Bonn, Germany
| | - Tobias Bruegmann
- grid.411984.10000 0001 0482 5331Institute for Cardiovascular Physiology, University Medical Center Göttingen, Göttingen, Germany ,grid.452396.f0000 0004 5937 5237German Center for Cardiovascular Research (DZHK), Partner site Göttingen, Göttingen, Germany ,grid.10388.320000 0001 2240 3300Institute of Physiology I, Medical Faculty, University of Bonn, Bonn, Germany ,grid.10388.320000 0001 2240 3300Research Training Group 1873, University of Bonn, Bonn, Germany ,grid.7450.60000 0001 2364 4210Cluster of Excellence “Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells” (MBExC), University of Göttingen, Göttingen, Germany
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Feng B, Li Z, Wang JB. Protein kinase C-mediated phosphorylation of the μ-opioid receptor and its effects on receptor signaling. Mol Pharmacol 2011; 79:768-75. [PMID: 21212139 DOI: 10.1124/mol.110.069096] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Phosphorylation of the μ opioid receptor (MOPr), mediated by several protein kinases, is a critical process in the regulation of MOPr signaling. Although G protein-coupled receptor kinases are known to play an essential role in the agonist-induced phosphorylation and desensitization of MOPr, evidence suggests that other protein kinases, especially protein kinase C (PKC), also participate in the regulation of MOPr signaling. In this study, we investigated the biochemical nature and downstream effects of PKC-mediated MOPr phosphorylation. We observed in vitro phosphorylation of the MOPr C terminus by purified PKC. Protein mass spectrometry and site-directed mutagenesis implicated Ser363 of MOPr as the primary substrate for PKC, and this was confirmed in Chinese hamster ovary cells stably expressing full-length MOPr using an antibody that specifically recognizes phosphorylated Ser363. Alanine mutation of Ser363 did not affect the affinity of MOPr-ligand binding and the efficiency of receptor G-protein coupling. However, the S363A mutation attenuated the desensitization of receptor G-protein coupling induced by phorbol 12-myristate. Our research thus has identified a specific PKC phosphorylation site in MOPr and demonstrated that PKC-mediated phosphorylation of MOPr induces receptor desensitization at the G protein coupling level.
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Affiliation(s)
- Bo Feng
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Maryland, Baltimore, MD 21201, USA
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González-Hernández T, Afonso-Oramas D, Cruz-Muros I. Phenotype, compartmental organization and differential vulnerability of nigral dopaminergic neurons. JOURNAL OF NEURAL TRANSMISSION. SUPPLEMENTUM 2009:21-37. [PMID: 20411765 DOI: 10.1007/978-3-211-92660-4_2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
The degeneration of nigral dopaminergic (DA-) neurons is the histopathologic hallmark of Parkinson's disease (PD), but not all nigral DA-cells show the same susceptibility to degeneration. This starts in DA-cells in the ventrolateral and caudal regions of the susbtantia nigra (SN) and progresses to DA-cells in the dorsomedial and rostral regions of the SN and the ventral tegmental area, where many neurons remain intact until the final stages of the disease. This fact indicates a relationship between the topographic distribution of midbrain DA-cells and their differential vulnerability, and the possibility that this differential vulnerability is associated with phenotypic differences between different subpopulations of nigral DA-cells. Studies carried out during the last two decades have contributed to establishing the existence of different compartments of nigral DA-cells according to their neurochemical profile, and a possible relationship between the expression of some factors and the relative vulnerability or resistance of DA-cell subpopulations to degeneration. These aspects are reviewed and discussed here.
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Affiliation(s)
- Tomás González-Hernández
- Department of Anatomy, Faculty of Medicine, University of La Laguna, 38071, La Laguna, Tenerife, Spain.
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Abscisic acid regulation of guard-cell K+ and anion channels in Gbeta- and RGS-deficient Arabidopsis lines. Proc Natl Acad Sci U S A 2008; 105:8476-81. [PMID: 18541915 DOI: 10.1073/pnas.0800980105] [Citation(s) in RCA: 97] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
In mammals, basal currents through G protein-coupled inwardly rectifying K(+) (GIRK) channels are repressed by Galpha(i/o)GDP, and the channels are activated by direct binding of free Gbetagamma subunits released upon stimulation of Galpha(i/o)-coupled receptors. However, essentially all information on G protein regulation of GIRK electrophysiology has been gained on the basis of coexpression studies in heterologous systems. A major advantage of the model organism, Arabidopsis thaliana, is the ease with which knockout mutants can be obtained. We evaluated plants harboring mutations in the sole Arabidopsis Galpha (AtGPA1), Gbeta (AGB1), and Regulator of G protein Signaling (AtRGS1) genes for impacts on ion channel regulation. In guard cells, where K(+) fluxes are integral to cellular regulation of stomatal apertures, inhibition of inward K(+) (K(in)) currents and stomatal opening by the phytohormone abscisic acid (ABA) was equally impaired in Atgpa1 and agb1 single mutants and the Atgpa1 agb1 double mutant. AGB1 overexpressing lines maintained a wild-type phenotype. The Atrgs1 mutation did not affect K(in) current magnitude or ABA sensitivity, but K(in) voltage-activation kinetics were altered. Thus, Arabidopsis cells differ from mammalian cells in that they uniquely use the Galpha subunit or regulation of the heterotrimer to mediate K(in) channel modulation after ligand perception. In contrast, outwardly rectifying (K(out)) currents were unaltered in the mutants, and ABA activation of slow anion currents was conditionally disrupted in conjunction with cytosolic pH clamp. Our studies highlight unique aspects of ion channel regulation by heterotrimeric G proteins and relate these aspects to stomatal aperture control, a key determinant of plant biomass acquisition and drought tolerance.
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