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Hamilton GL, Saikia N, Basak S, Welcome FS, Wu F, Kubiak J, Zhang C, Hao Y, Seidel CAM, Ding F, Sanabria H, Bowen ME. Fuzzy supertertiary interactions within PSD-95 enable ligand binding. eLife 2022; 11:e77242. [PMID: 36069777 PMCID: PMC9581536 DOI: 10.7554/elife.77242] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2022] [Accepted: 09/06/2022] [Indexed: 11/13/2022] Open
Abstract
The scaffold protein PSD-95 links postsynaptic receptors to sites of presynaptic neurotransmitter release. Flexible linkers between folded domains in PSD-95 enable a dynamic supertertiary structure. Interdomain interactions within the PSG supramodule, formed by PDZ3, SH3, and Guanylate Kinase domains, regulate PSD-95 activity. Here we combined discrete molecular dynamics and single molecule Förster resonance energy transfer (FRET) to characterize the PSG supramodule, with time resolution spanning picoseconds to seconds. We used a FRET network to measure distances in full-length PSD-95 and model the conformational ensemble. We found that PDZ3 samples two conformational basins, which we confirmed with disulfide mapping. To understand effects on activity, we measured binding of the synaptic adhesion protein neuroligin. We found that PSD-95 bound neuroligin well at physiological pH while truncated PDZ3 bound poorly. Our hybrid structural models reveal how the supertertiary context of PDZ3 enables recognition of this critical synaptic ligand.
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Affiliation(s)
- George L Hamilton
- Department of Physics and Astronomy, Clemson UniversityClemsonUnited States
| | - Nabanita Saikia
- Department of Physics and Astronomy, Clemson UniversityClemsonUnited States
| | - Sujit Basak
- Department of Physiology and Biophysics, Stony Brook UniversityStony BrookUnited States
| | - Franceine S Welcome
- Department of Physiology and Biophysics, Stony Brook UniversityStony BrookUnited States
| | - Fang Wu
- Department of Physiology and Biophysics, Stony Brook UniversityStony BrookUnited States
| | - Jakub Kubiak
- Molecular Physical Chemistry, Heinrich Heine UniversityDüsseldorfGermany
| | - Changcheng Zhang
- Department of Physiology and Biophysics, Stony Brook UniversityStony BrookUnited States
| | - Yan Hao
- Department of Physiology and Biophysics, Stony Brook UniversityStony BrookUnited States
| | - Claus AM Seidel
- Molecular Physical Chemistry, Heinrich Heine UniversityDüsseldorfGermany
| | - Feng Ding
- Department of Physics and Astronomy, Clemson UniversityClemsonUnited States
| | - Hugo Sanabria
- Department of Physics and Astronomy, Clemson UniversityClemsonUnited States
| | - Mark E Bowen
- Department of Physiology and Biophysics, Stony Brook UniversityStony BrookUnited States
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2
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The synaptic scaffold protein MPP2 interacts with GABAA receptors at the periphery of the postsynaptic density of glutamatergic synapses. PLoS Biol 2022; 20:e3001503. [PMID: 35312684 PMCID: PMC8970474 DOI: 10.1371/journal.pbio.3001503] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2021] [Revised: 03/31/2022] [Accepted: 12/02/2021] [Indexed: 01/08/2023] Open
Abstract
Recent advances in imaging technology have highlighted that scaffold proteins and receptors are arranged in subsynaptic nanodomains. The synaptic membrane-associated guanylate kinase (MAGUK) scaffold protein membrane protein palmitoylated 2 (MPP2) is a component of α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA) receptor–associated protein complexes and also binds to the synaptic cell adhesion molecule SynCAM 1. Using superresolution imaging, we show that—like SynCAM 1—MPP2 is situated at the periphery of the postsynaptic density (PSD). In order to explore MPP2-associated protein complexes, we used a quantitative comparative proteomics approach and identified multiple γ-aminobutyric acid (GABA)A receptor subunits among novel synaptic MPP2 interactors. In line with a scaffold function for MPP2 in the assembly and/or modulation of intact GABAA receptors, manipulating MPP2 expression had effects on inhibitory synaptic transmission. We further show that GABAA receptors are found together with MPP2 in a subset of dendritic spines and thus highlight MPP2 as a scaffold that serves as an adaptor molecule, linking peripheral synaptic elements critical for inhibitory regulation to central structures at the PSD of glutamatergic synapses. This study shows that the MAGUK scaffold protein MPP2 is located at the periphery of postsynaptic densities in excitatory neurons, where it interacts with GABA-A receptors, thereby serving as a functional adaptor that links excitatory and inhibitory components of synaptic transmission at glutamatergic synapses.
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3
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PSD-95: An Effective Target for Stroke Therapy Using Neuroprotective Peptides. Int J Mol Sci 2021; 22:ijms222212585. [PMID: 34830481 PMCID: PMC8618101 DOI: 10.3390/ijms222212585] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2021] [Accepted: 11/17/2021] [Indexed: 02/07/2023] Open
Abstract
Therapies for stroke have remained elusive in the past despite the great relevance of this pathology. However, recent results have provided strong evidence that postsynaptic density protein-95 (PSD-95) can be exploited as an efficient target for stroke neuroprotection by strategies able to counteract excitotoxicity, a major mechanism of neuronal death after ischemic stroke. This scaffold protein is key to the maintenance of a complex framework of protein interactions established at the postsynaptic density (PSD) of excitatory neurons, relevant to neuronal function and survival. Using cell penetrating peptides (CPPs) as therapeutic tools, two different approaches have been devised and advanced to different levels of clinical development. First, nerinetide (Phase 3) and AVLX-144 (Phase 1) were designed to interfere with the coupling of the ternary complex formed by PSD-95 with GluN2B subunits of the N-methyl-D-aspartate type of glutamate receptors (NMDARs) and neuronal nitric oxide synthase (nNOS). These peptides reduced neurotoxicity derived from NMDAR overactivation, decreased infarct volume and improved neurobehavioral results in different models of ischemic stroke. However, an important caveat to this approach was PSD-95 processing by calpain, a pathological mechanism specifically induced by excitotoxicity that results in a profound alteration of survival signaling. Thus, a third peptide (TP95414) has been recently developed to interfere with PSD-95 cleavage and reduce neuronal death, which also improves neurological outcome in a preclinical mouse model of permanent ischemia. Here, we review recent advancements in the development and characterization of PSD-95-targeted CPPs and propose the combination of these two approaches to improve treatment of stroke and other excitotoxicity-associated disorders.
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Ayuso-Dolado S, Esteban-Ortega GM, Vidaurre ÓG, Díaz-Guerra M. A novel cell-penetrating peptide targeting calpain-cleavage of PSD-95 induced by excitotoxicity improves neurological outcome after stroke. Theranostics 2021; 11:6746-6765. [PMID: 34093851 PMCID: PMC8171078 DOI: 10.7150/thno.60701] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2021] [Accepted: 04/02/2021] [Indexed: 01/11/2023] Open
Abstract
Postsynaptic density protein-95 (PSD-95) is a multidomain protein critical to the assembly of signaling complexes at excitatory synapses, required for neuronal survival and function. However, calpain-processing challenges PSD-95 function after overactivation of excitatory glutamate receptors (excitotoxicity) in stroke, a leading cause of death, disability and dementia in need of efficient pharmacological treatments. A promising strategy is neuroprotection of the infarct penumbra, a potentially recoverable area, by promotion of survival signaling. Interference of PSD-95 processing induced by excitotoxicity might thus be a therapeutic target for stroke and other excitotoxicity-associated pathologies. Methods: The nature and stability of PSD-95 calpain-fragments was analyzed using in vitro assays or excitotoxic conditions induced in rat primary neuronal cultures or a mouse model of stroke. We then sequenced PSD-95 cleavage-sites and rationally designed three cell-penetrating peptides (CPPs) containing these sequences. The peptides effects on PSD-95 stability and neuronal viability were investigated in the cultured neurons, subjected to acute or chronic excitotoxicity. We also analyzed the effect of one of these peptides in the mouse model of stroke by measuring infarct size and evaluating motor coordination and balance. Results: Calpain cleaves three interdomain linker regions in PSD-95 and produces stable fragments corresponding to previously described PSD-95 supramodules (PDZ1-2 and P-S-G) as well as a truncated form SH3-GK. Peptide TP95414, containing the cleavage site in the PDZ3-SH3 linker, is able to interfere PSD-95 downregulation and reduces neuronal death by excitotoxicity. Additionally, TP95414 is delivered to mice cortex and, in a severe model of permanent ischemia, significantly improves the neurological outcome after brain damage. Conclusions: Interference of excitotoxicity-induced PSD-95-processing with specific CPPs constitutes a novel and promising therapeutic approach for stroke treatment.
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Pan YE, Tibbe D, Harms FL, Reißner C, Becker K, Dingmann B, Mirzaa G, Kattentidt-Mouravieva AA, Shoukier M, Aggarwal S, Missler M, Kutsche K, Kreienkamp HJ. Missense mutations in CASK, coding for the calcium-/calmodulin-dependent serine protein kinase, interfere with neurexin binding and neurexin-induced oligomerization. J Neurochem 2020; 157:1331-1350. [PMID: 33090494 DOI: 10.1111/jnc.15215] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2020] [Revised: 10/01/2020] [Accepted: 10/07/2020] [Indexed: 12/19/2022]
Abstract
Mutations in the X-linked gene coding for the calcium-/calmodulin-dependent serine protein kinase (CASK) are associated with severe neurological disorders ranging from intellectual disability (in males) to mental retardation and microcephaly with pontine and cerebellar hypoplasia. CASK is involved in transcription control, in the regulation of trafficking of the post-synaptic NMDA and α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid receptors, and acts as a presynaptic scaffolding protein. For CASK missense mutations, it is mostly unclear which of CASK's molecular interactions and cellular functions are altered and contribute to patient phenotypes. We identified five CASK missense mutations in male patients affected by neurodevelopmental disorders. These and five previously reported mutations were systematically analysed with respect to interaction with CASK interaction partners by co-expression and co-immunoprecipitation. We show that one mutation in the L27 domain interferes with binding to synapse-associated protein of 97 kDa. Two mutations in the guanylate kinase (GK) domain affect binding of CASK to the nuclear factors CASK-interacting nucleosome assembly protein (CINAP) and T-box, brain, 1 (Tbr1). A total of five mutations in GK as well as PSD-95/discs large/ZO-1 (PDZ) domains affect binding of CASK to the pre-synaptic cell adhesion molecule Neurexin. Upon expression in neurons, we observe that binding to Neurexin is not required for pre-synaptic localization of CASK. We show by bimolecular fluorescence complementation assay that Neurexin induces oligomerization of CASK, and that mutations in GK and PDZ domains interfere with the Neurexin-induced oligomerization of CASK. Our data are supported by molecular modelling, where we observe that the cooperative activity of PDZ, SH3 and GK domains is required for Neurexin binding and oligomerization of CASK.
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Affiliation(s)
- Yingzhou Edward Pan
- Institute for Human Genetics, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Debora Tibbe
- Institute for Human Genetics, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Frederike Leonie Harms
- Institute for Human Genetics, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Carsten Reißner
- Institut für Anatomie und Molekulare Neurobiologie, Westfälische Wilhelms-Universität Münster, Münster, Germany
| | | | - Bri Dingmann
- Medical Genetics Department, Seattle Children's Hospital, Seattle, Washington, DC, USA
| | - Ghayda Mirzaa
- Center for Integrative Brain Research, Seattle Children's Research Institute, Seattle, Washington, DC, USA.,Department of Pediatrics, University of Washington, Seattle, Washington, DC, USA.,Brotman Baty Institute for Precision Medicine, Seattle, WA, USA
| | | | - Moneef Shoukier
- Pränatal-Medizin München, Frauenärzte und Humangenetiker MVZ, München, Germany
| | - Shagun Aggarwal
- Centre for DNA Fingerprinting and Diagnostics, Hyderabad, India
| | - Markus Missler
- Institut für Anatomie und Molekulare Neurobiologie, Westfälische Wilhelms-Universität Münster, Münster, Germany
| | - Kerstin Kutsche
- Institute for Human Genetics, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Hans-Jürgen Kreienkamp
- Institute for Human Genetics, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
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6
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Omelchenko A, Menon H, Donofrio SG, Kumar G, Chapman HM, Roshal J, Martinez-Montes ER, Wang TL, Spaller MR, Firestein BL. Interaction Between CRIPT and PSD-95 Is Required for Proper Dendritic Arborization in Hippocampal Neurons. Mol Neurobiol 2020; 57:2479-2493. [PMID: 32157575 PMCID: PMC7176523 DOI: 10.1007/s12035-020-01895-5] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2019] [Accepted: 02/24/2020] [Indexed: 01/10/2023]
Abstract
CRIPT, the cysteine-rich PDZ-binding protein, binds to the third PDZ domain of PSD-95 (postsynaptic density protein 95) family proteins and directly binds microtubules, linking PSD-95 family proteins to the neuronal cytoskeleton. Here, we show that overexpression of a full-length CRIPT leads to a modest decrease, and knockdown of CRIPT leads to an increase in dendritic branching in cultured rat hippocampal neurons. Overexpression of truncated CRIPT lacking the PDZ domain-binding motif, which does not bind to PSD-95, significantly decreases dendritic arborization. Conversely, overexpression of a full-length CRIPT significantly increases the number of immature and mature dendritic spines, and this effect is not observed when CRIPT∆PDZ is overexpressed. Competitive inhibition of CRIPT binding to the third PDZ domain of PSD-95 with PDZ3-binding peptides resulted in differential effects on dendritic arborization based on the origin of respective peptide sequence. These results highlight multifunctional roles of CRIPT during development and underscore the significance of the interaction between CRIPT and the third PDZ domain of PSD-95.
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Affiliation(s)
- Anton Omelchenko
- Department of Cell Biology and Neuroscience, Rutgers University, 604 Allison Road, Piscataway, NJ, 08854-8082, USA
- Neuroscience Graduate Program, Rutgers University, 604 Allison Road, Piscataway, NJ, 08854-8082, USA
| | - Harita Menon
- Department of Cell Biology and Neuroscience, Rutgers University, 604 Allison Road, Piscataway, NJ, 08854-8082, USA
| | - Sarah G Donofrio
- Department of Cell Biology and Neuroscience, Rutgers University, 604 Allison Road, Piscataway, NJ, 08854-8082, USA
| | - Gaurav Kumar
- Department of Cell Biology and Neuroscience, Rutgers University, 604 Allison Road, Piscataway, NJ, 08854-8082, USA
| | - Heidi M Chapman
- Geisel School of Medicine, Department of Medical Education and Norris Cotton Cancer Center, Dartmouth College, Lebanon, NH, 03756, USA
| | - Joshua Roshal
- Department of Cell Biology and Neuroscience, Rutgers University, 604 Allison Road, Piscataway, NJ, 08854-8082, USA
| | - Eduardo R Martinez-Montes
- Department of Cell Biology and Neuroscience, Rutgers University, 604 Allison Road, Piscataway, NJ, 08854-8082, USA
| | - Tiffany L Wang
- Geisel School of Medicine, Department of Medical Education and Norris Cotton Cancer Center, Dartmouth College, Lebanon, NH, 03756, USA
| | - Mark R Spaller
- Geisel School of Medicine, Department of Medical Education and Norris Cotton Cancer Center, Dartmouth College, Lebanon, NH, 03756, USA
| | - Bonnie L Firestein
- Department of Cell Biology and Neuroscience, Rutgers University, 604 Allison Road, Piscataway, NJ, 08854-8082, USA.
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7
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Laursen L, Karlsson E, Gianni S, Jemth P. Functional interplay between protein domains in a supramodular structure involving the postsynaptic density protein PSD-95. J Biol Chem 2019; 295:1992-2000. [PMID: 31831623 DOI: 10.1074/jbc.ra119.011050] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2019] [Revised: 12/12/2019] [Indexed: 11/06/2022] Open
Abstract
Cell scaffolding and signaling are governed by protein-protein interactions. Although a particular interaction is often defined by two specific domains binding to each other, this interaction often occurs in the context of other domains in multidomain proteins. How such adjacent domains form supertertiary structures and modulate protein-protein interactions has only recently been addressed and is incompletely understood. The postsynaptic density protein PSD-95 contains a three-domain supramodule, denoted PSG, which consists of PDZ, Src homology 3 (SH3), and guanylate kinase-like domains. The PDZ domain binds to the C terminus of its proposed natural ligand, CXXC repeat-containing interactor of PDZ3 domain (CRIPT), and results from previous experiments using only the isolated PDZ domain are consistent with the simplest scenario for a protein-protein interaction; namely, a two-state mechanism. Here we analyzed the binding kinetics of the PSG supramodule with CRIPT. We show that PSG binds CRIPT via a more complex mechanism involving two conformational states interconverting on the second timescale. Both conformational states bound a CRIPT peptide with similar affinities but with different rates, and the distribution of the two conformational states was slightly shifted upon CRIPT binding. Our results are consistent with recent structural findings of conformational changes in PSD-95 and demonstrate how conformational transitions in supertertiary structures can shape the ligand-binding energy landscape and modulate protein-protein interactions.
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Affiliation(s)
- Louise Laursen
- Department of Medical Biochemistry and Microbiology, Uppsala University, BMC Box 582, 75123 Uppsala, Sweden
| | - Elin Karlsson
- Department of Medical Biochemistry and Microbiology, Uppsala University, BMC Box 582, 75123 Uppsala, Sweden
| | - Stefano Gianni
- Istituto Pasteur-Fondazione Cenci Bolognetti and Istituto di Biologia e Patologia Molecolari del CNR, Dipartimento di Scienze Biochimiche "A. Rossi Fanelli," Sapienza Università di Roma, 00185 Rome, Italy.
| | - Per Jemth
- Department of Medical Biochemistry and Microbiology, Uppsala University, BMC Box 582, 75123 Uppsala, Sweden.
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8
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Rademacher N, Kuropka B, Kunde SA, Wahl MC, Freund C, Shoichet SA. Intramolecular domain dynamics regulate synaptic MAGUK protein interactions. eLife 2019; 8:41299. [PMID: 30864948 PMCID: PMC6438691 DOI: 10.7554/elife.41299] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2018] [Accepted: 03/12/2019] [Indexed: 12/25/2022] Open
Abstract
PSD-95 MAGUK family scaffold proteins are multi-domain organisers of synaptic transmission that contain three PDZ domains followed by an SH3-GK domain tandem. This domain architecture allows coordinated assembly of protein complexes composed of neurotransmitter receptors, synaptic adhesion molecules and downstream signalling effectors. Here we show that binding of monomeric CRIPT-derived PDZ3 ligands to the third PDZ domain of PSD-95 induces functional changes in the intramolecular SH3-GK domain assembly that influence subsequent homotypic and heterotypic complex formation. We identify PSD-95 interactors that differentially bind to the SH3-GK domain tandem depending on its conformational state. Among these interactors, we further establish the heterotrimeric G protein subunit Gnb5 as a PSD-95 complex partner at dendritic spines of rat hippocampal neurons. The PSD-95 GK domain binds to Gnb5, and this interaction is triggered by CRIPT-derived PDZ3 ligands binding to the third PDZ domain of PSD-95, unraveling a hierarchical binding mechanism of PSD-95 complex formation.
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Affiliation(s)
- Nils Rademacher
- Neuroscience Research Center, Charité-Universitätsmedizin Berlin, Berlin, Germany
| | - Benno Kuropka
- Institute of Chemistry and Biochemistry, Laboratory of Protein Biochemistry, Freie Universität Berlin, Berlin, Germany
| | - Stella-Amrei Kunde
- Neuroscience Research Center, Charité-Universitätsmedizin Berlin, Berlin, Germany
| | - Markus C Wahl
- Institute of Chemistry and Biochemistry, Laboratory of Structural Biochemistry, Freie Universität Berlin, Berlin, Germany.,Macromolecular Crystallography, Helmholtz-Zentrum Berlin für Materialien und Energie, Berlin, Germany
| | - Christian Freund
- Institute of Chemistry and Biochemistry, Laboratory of Protein Biochemistry, Freie Universität Berlin, Berlin, Germany
| | - Sarah A Shoichet
- Neuroscience Research Center, Charité-Universitätsmedizin Berlin, Berlin, Germany
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9
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Kunde SA, Rademacher N, Zieger H, Shoichet SA. Protein kinase C regulates AMPA receptor auxiliary protein Shisa9/CKAMP44 through interactions with neuronal scaffold PICK1. FEBS Open Bio 2017; 7:1234-1245. [PMID: 28904854 PMCID: PMC5586339 DOI: 10.1002/2211-5463.12261] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2017] [Revised: 05/19/2017] [Accepted: 06/08/2017] [Indexed: 12/22/2022] Open
Abstract
Synaptic α‐amino‐3‐hydroxyl‐5‐methyl‐4‐isoxazole‐propionate (AMPA) receptors are essential mediators of neurotransmission in the central nervous system. Shisa9/cysteine‐knot AMPAR modulating protein 44 (CKAMP44) is a transmembrane protein recently found to be present in AMPA receptor‐associated protein complexes. Here, we show that the cytosolic tail of Shisa9/CKAMP44 interacts with multiple scaffold proteins that are important for regulating synaptic plasticity in central neurons. We focussed on the interaction with the scaffold protein PICK1, which facilitates the formation of a tripartite complex with the protein kinase C (PKC) and thereby regulates phosphorylation of Shisa9/CKAMP44 C‐terminal residues. This work has implications for our understanding of how PICK1 modulates AMPAR‐mediated transmission and plasticity and also highlights a novel function of PKC.
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Affiliation(s)
- Stella-Amrei Kunde
- Neuroscience Research Center/Institute of Biochemistry Charité - Universitätsmedizin Berlin Germany
| | - Nils Rademacher
- Neuroscience Research Center/Institute of Biochemistry Charité - Universitätsmedizin Berlin Germany
| | - Hanna Zieger
- Neuroscience Research Center/Institute of Biochemistry Charité - Universitätsmedizin Berlin Germany
| | - Sarah A Shoichet
- Neuroscience Research Center/Institute of Biochemistry Charité - Universitätsmedizin Berlin Germany
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10
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Rademacher N, Schmerl B, Lardong JA, Wahl MC, Shoichet SA. MPP2 is a postsynaptic MAGUK scaffold protein that links SynCAM1 cell adhesion molecules to core components of the postsynaptic density. Sci Rep 2016; 6:35283. [PMID: 27756895 PMCID: PMC5069480 DOI: 10.1038/srep35283] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2016] [Accepted: 09/15/2016] [Indexed: 02/07/2023] Open
Abstract
At neuronal synapses, multiprotein complexes of trans-synaptic adhesion molecules, scaffold proteins and neurotransmitter receptors assemble to essential building blocks required for synapse formation and maintenance. Here we describe a novel role for the membrane-associated guanylate kinase (MAGUK) protein MPP2 (MAGUK p55 subfamily member 2) at synapses of rat central neurons. Through interactions mediated by its C-terminal SH3-GK domain module, MPP2 binds to the abundant postsynaptic scaffold proteins PSD-95 and GKAP and localises to postsynaptic sites in hippocampal neurons. MPP2 also colocalises with the synaptic adhesion molecule SynCAM1. We demonstrate that the SynCAM1 C-terminus interacts directly with the MPP2 PDZ domain and that MPP2 does not interact in this manner with other highly abundant postsynaptic transmembrane proteins. Our results highlight a previously unexplored role for MPP2 at postsynaptic sites as a scaffold that links SynCAM1 cell adhesion molecules to core proteins of the postsynaptic density.
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Affiliation(s)
- Nils Rademacher
- Neuroscience Research Center and Cluster of Excellence NeuroCure, Charité-Universitätsmedizin Berlin, Charitéplatz 1, 10117 Berlin, Germany
| | - Bettina Schmerl
- Neuroscience Research Center and Cluster of Excellence NeuroCure, Charité-Universitätsmedizin Berlin, Charitéplatz 1, 10117 Berlin, Germany
| | - Jennifer A. Lardong
- Institute of Chemistry and Biochemistry, Structural Biochemistry, Freie Universität Berlin, Takustr. 6, 14195 Berlin, Germany
| | - Markus C. Wahl
- Institute of Chemistry and Biochemistry, Structural Biochemistry, Freie Universität Berlin, Takustr. 6, 14195 Berlin, Germany
| | - Sarah A. Shoichet
- Neuroscience Research Center and Cluster of Excellence NeuroCure, Charité-Universitätsmedizin Berlin, Charitéplatz 1, 10117 Berlin, Germany
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11
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Schuster S, Rivalan M, Strauss U, Stoenica L, Trimbuch T, Rademacher N, Parthasarathy S, Lajkó D, Rosenmund C, Shoichet SA, Winter Y, Tarabykin V, Rosário M. NOMA-GAP/ARHGAP33 regulates synapse development and autistic-like behavior in the mouse. Mol Psychiatry 2015; 20:1120-31. [PMID: 25869807 DOI: 10.1038/mp.2015.42] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/06/2014] [Revised: 02/23/2015] [Accepted: 03/03/2015] [Indexed: 02/06/2023]
Abstract
Neuropsychiatric developmental disorders, such as autism spectrum disorders (ASDs) and schizophrenia, are typically characterized by alterations in social behavior and have been linked to aberrant dendritic spine and synapse development. Here we show, using genetically engineered mice, that the Cdc42 GTPase-activating multiadaptor protein, NOMA-GAP, regulates autism-like social behavior in the mouse, as well as dendritic spine and synapse development. Surprisingly, we were unable to restore spine morphology or autism-associated social behavior in NOMA-GAP-deficient animals by Cre-mediated deletion of Cdc42 alone. Spine morphology can be restored in vivo by re-expression of wild-type NOMA-GAP or a mutant of NOMA-GAP that lacks the RhoGAP domain, suggesting that other signaling functions are involved. Indeed, we show that NOMA-GAP directly interacts with several MAGUK (membrane-associated guanylate kinase) proteins, and that this modulates NOMA-GAP activity toward Cdc42. Moreover, we demonstrate that NOMA-GAP is a major regulator of PSD-95 in the neocortex. Loss of NOMA-GAP leads to strong upregulation of serine 295 phosphorylation of PSD-95 and moreover to its subcellular mislocalization. This is associated with marked loss of surface α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA) receptor and defective synaptic transmission, thereby providing a molecular basis for autism-like social behavior in the absence of NOMA-GAP.
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Affiliation(s)
- S Schuster
- Dendritic Development, Institute of Cell and Neurobiology, Charité Universitätsmedizin Berlin, Berlin, Germany
| | - M Rivalan
- Institute of Cognitive Neurobiology, Humboldt University Berlin and Berlin Mouse Clinic for Neurology and Psychiatry, Charité Universitätsmedizin, Berlin, Germany
| | - U Strauss
- Ionic Current Development, Institute of Cell and Neurobiology, Charité Universitätsmedizin Berlin, Berlin, Germany
| | - L Stoenica
- Ionic Current Development, Institute of Cell and Neurobiology, Charité Universitätsmedizin Berlin, Berlin, Germany
| | - T Trimbuch
- Neuroscience, NeuroCure-NWFZ, Charité Universitätsmedizin Berlin, Berlin, Germany
| | - N Rademacher
- Molecular Neurobiology and Genetics, NeuroCure-NWFZ, Charité Universitätsmedizin Berlin, Berlin, Germany
| | - S Parthasarathy
- Cortical Development, Institute of Cell and Neurobiology, Charité Universitätsmedizin Berlin, Berlin, Germany
| | - D Lajkó
- Dendritic Development, Institute of Cell and Neurobiology, Charité Universitätsmedizin Berlin, Berlin, Germany.,Cortical Development, Institute of Cell and Neurobiology, Charité Universitätsmedizin Berlin, Berlin, Germany
| | - C Rosenmund
- Neuroscience, NeuroCure-NWFZ, Charité Universitätsmedizin Berlin, Berlin, Germany
| | - S A Shoichet
- Molecular Neurobiology and Genetics, NeuroCure-NWFZ, Charité Universitätsmedizin Berlin, Berlin, Germany
| | - Y Winter
- Institute of Cognitive Neurobiology, Humboldt University Berlin and Berlin Mouse Clinic for Neurology and Psychiatry, Charité Universitätsmedizin, Berlin, Germany
| | - V Tarabykin
- Cortical Development, Institute of Cell and Neurobiology, Charité Universitätsmedizin Berlin, Berlin, Germany
| | - M Rosário
- Dendritic Development, Institute of Cell and Neurobiology, Charité Universitätsmedizin Berlin, Berlin, Germany
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Eildal JNN, Bach A, Dogan J, Ye F, Zhang M, Jemth P, Strømgaard K. Rigidified Clicked Dimeric Ligands for Studying the Dynamics of the PDZ1-2 Supramodule of PSD-95. Chembiochem 2014; 16:64-9. [DOI: 10.1002/cbic.201402547] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2014] [Indexed: 11/06/2022]
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