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Oevel K, Hohensee S, Kumar A, Rosas-Brugada I, Bartolini F, Soykan T, Haucke V. Rho GTPase signaling and mDia facilitate endocytosis via presynaptic actin. eLife 2024; 12:RP92755. [PMID: 38502163 PMCID: PMC10950329 DOI: 10.7554/elife.92755] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/20/2024] Open
Abstract
Neurotransmission at synapses is mediated by the fusion and subsequent endocytosis of synaptic vesicle membranes. Actin has been suggested to be required for presynaptic endocytosis but the mechanisms that control actin polymerization and its mode of action within presynaptic nerve terminals remain poorly understood. We combine optical recordings of presynaptic membrane dynamics and ultrastructural analysis with genetic and pharmacological manipulations to demonstrate that presynaptic endocytosis is controlled by actin regulatory diaphanous-related formins mDia1/3 and Rho family GTPase signaling in mouse hippocampal neurons. We show that impaired presynaptic actin assembly in the near absence of mDia1/3 and reduced RhoA activity is partly compensated by hyperactivation of Rac1. Inhibition of Rac1 signaling further aggravates impaired presynaptic endocytosis elicited by loss of mDia1/3. Our data suggest that interdependent mDia1/3-Rho and Rac1 signaling pathways cooperatively act to facilitate synaptic vesicle endocytosis by controlling presynaptic F-actin.
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Affiliation(s)
- Kristine Oevel
- Leibniz-Forschungsinstitut für Molekulare Pharmakologie (FMP)BerlinGermany
| | - Svea Hohensee
- Leibniz-Forschungsinstitut für Molekulare Pharmakologie (FMP)BerlinGermany
| | - Atul Kumar
- Department of Pathology and Cell Biology, Columbia University Medical CenterNew York CityUnited States
| | | | - Francesca Bartolini
- Department of Pathology and Cell Biology, Columbia University Medical CenterNew York CityUnited States
| | - Tolga Soykan
- Leibniz-Forschungsinstitut für Molekulare Pharmakologie (FMP)BerlinGermany
| | - Volker Haucke
- Leibniz-Forschungsinstitut für Molekulare Pharmakologie (FMP)BerlinGermany
- Faculty of Biology, Chemistry, Pharmacy, Freie Universität BerlinBerlinGermany
- NeuroCure Cluster of Excellence, Charité Universitätsmedizin BerlinBerlinGermany
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Bogdanow B, Gruska I, Mühlberg L, Protze J, Hohensee S, Vetter B, Bosse JB, Lehmann M, Sadeghi M, Wiebusch L, Liu F. Spatially resolved protein map of intact human cytomegalovirus virions. Nat Microbiol 2023; 8:1732-1747. [PMID: 37550507 PMCID: PMC10465357 DOI: 10.1038/s41564-023-01433-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2022] [Accepted: 06/20/2023] [Indexed: 08/09/2023]
Abstract
Herpesviruses assemble large enveloped particles that are difficult to characterize structurally due to their size, fragility and complex multilayered proteome with partially amorphous nature. Here we used crosslinking mass spectrometry and quantitative proteomics to derive a spatially resolved interactome map of intact human cytomegalovirus virions. This enabled the de novo allocation of 32 viral proteins into four spatially resolved virion layers, each organized by a dominant viral scaffold protein. The viral protein UL32 engages with all layers in an N-to-C-terminal radial orientation, bridging nucleocapsid to viral envelope. We observed the layer-specific incorporation of 82 host proteins, of which 39 are selectively recruited. We uncovered how UL32, by recruitment of PP-1 phosphatase, antagonizes binding to 14-3-3 proteins. This mechanism assures effective viral biogenesis, suggesting a perturbing role of UL32-14-3-3 interaction. Finally, we integrated these data into a coarse-grained model to provide global insights into the native configuration of virus and host protein interactions inside herpesvirions.
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Affiliation(s)
- Boris Bogdanow
- Research group 'Structural Interactomics', Leibniz Forschungsinstitut für Molekulare Pharmakologie (FMP), Berlin, Germany.
| | - Iris Gruska
- Labor für Pädiatrische Molekularbiologie, Department of Pediatric Oncology and Hematology, Charité - Universitätsmedizin Berlin, Berlin, Germany
| | - Lars Mühlberg
- Research group 'Structural Interactomics', Leibniz Forschungsinstitut für Molekulare Pharmakologie (FMP), Berlin, Germany
| | - Jonas Protze
- Research group 'Structural Bioinformatics', Leibniz Forschungsinstitut für Molekulare Pharmakologie (FMP), Berlin, Germany
| | - Svea Hohensee
- Cellular Imaging core facility, Leibniz Forschungsinstitut für Molekulare Pharmakologie (FMP), Berlin, Germany
| | - Barbara Vetter
- Labor für Pädiatrische Molekularbiologie, Department of Pediatric Oncology and Hematology, Charité - Universitätsmedizin Berlin, Berlin, Germany
| | - Jens B Bosse
- Centre for Structural Systems Biology, Hamburg, Germany
- Hannover Medical School, Institute of Virology, Hannover, Germany
- Cluster of Excellence RESIST (EXC 2155), Hannover Medical School, Hannover, Germany
- Leibniz-Institute of Virology (LIV), Hamburg, Germany
| | - Martin Lehmann
- Cellular Imaging core facility, Leibniz Forschungsinstitut für Molekulare Pharmakologie (FMP), Berlin, Germany
| | - Mohsen Sadeghi
- Department of Mathematics and Computer Science, Freie Universität Berlin, Berlin, Germany.
| | - Lüder Wiebusch
- Labor für Pädiatrische Molekularbiologie, Department of Pediatric Oncology and Hematology, Charité - Universitätsmedizin Berlin, Berlin, Germany.
| | - Fan Liu
- Research group 'Structural Interactomics', Leibniz Forschungsinstitut für Molekulare Pharmakologie (FMP), Berlin, Germany.
- Charité Universitätsmedizin Berlin, Berlin, Germany.
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Weinert S, Jabs S, Hohensee S, Chan WL, Kornak U, Jentsch TJ. Transport activity and presence of ClC-7/Ostm1 complex account for different cellular functions. EMBO Rep 2014; 15:784-91. [PMID: 24820037 DOI: 10.15252/embr.201438553] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Loss of the lysosomal ClC-7/Ostm1 2Cl(-)/H(+) exchanger causes lysosomal storage disease and osteopetrosis in humans and additionally changes fur colour in mice. Its conversion into a Cl(-) conductance in Clcn7(unc/unc) mice entails similarly severe lysosomal storage, but less severe osteopetrosis and no change in fur colour. To elucidate the basis for these phenotypical differences, we generated Clcn7(td/td) mice expressing an ion transport-deficient mutant. Their osteopetrosis was as severe as in Clcn7(-/-) mice, suggesting that the electric shunt provided by ClC-7(unc) can partially rescue osteoclast function. The normal coat colour of Clcn7(td/td) mice and their less severe neurodegeneration suggested that the ClC-7 protein, even when lacking measurable ion transport activity, is sufficient for hair pigmentation and that the conductance of ClC-7(unc) is harmful for neurons. Our in vivo structure-function analysis of ClC-7 reveals that both protein-protein interactions and ion transport must be considered in the pathogenesis of ClC-7-related diseases.
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Affiliation(s)
- Stefanie Weinert
- Leibniz-Institut für Molekulare Pharmakologie (FMP), Berlin, Germany Max-Delbrück-Centrum für Molekulare Medizin (MDC), Berlin, Germany
| | - Sabrina Jabs
- Leibniz-Institut für Molekulare Pharmakologie (FMP), Berlin, Germany Max-Delbrück-Centrum für Molekulare Medizin (MDC), Berlin, Germany
| | - Svea Hohensee
- Leibniz-Institut für Molekulare Pharmakologie (FMP), Berlin, Germany
| | - Wing Lee Chan
- Institut für Humangenetik, Charité Universitätsmedizin Berlin, Berlin, Germany Max-Planck-Institut für Molekulare Genetik, Berlin, Germany
| | - Uwe Kornak
- Institut für Humangenetik, Charité Universitätsmedizin Berlin, Berlin, Germany Max-Planck-Institut für Molekulare Genetik, Berlin, Germany
| | - Thomas J Jentsch
- Leibniz-Institut für Molekulare Pharmakologie (FMP), Berlin, Germany Max-Delbrück-Centrum für Molekulare Medizin (MDC), Berlin, Germany Neurocure Cluster of Excellence, Charité Universitätsmedizin Berlin, Berlin, Germany
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Hohensee S, Bleiss W, Duch C. Correlative electron and confocal microscopy assessment of synapse localization in the central nervous system of an insect. J Neurosci Methods 2008; 168:64-70. [DOI: 10.1016/j.jneumeth.2007.09.018] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2007] [Revised: 09/13/2007] [Accepted: 09/17/2007] [Indexed: 10/22/2022]
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