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Balta EA, Schäffner I, Wittmann MT, Sock E, von Zweydorf F, von Wittgenstein J, Steib K, Heim B, Kremmer E, Häberle BM, Ueffing M, Lie DC, Gloeckner CJ. Phosphorylation of the neurogenic transcription factor SOX11 on serine 133 modulates neuronal morphogenesis. Sci Rep 2018; 8:16196. [PMID: 30385877 PMCID: PMC6212486 DOI: 10.1038/s41598-018-34480-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2018] [Accepted: 09/25/2018] [Indexed: 02/07/2023] Open
Abstract
The intellectual disability gene, Sox11, encodes for a critical neurodevelopmental transcription factor with functions in precursor survival, neuronal fate determination, migration and morphogenesis. The mechanisms regulating SOX11’s activity remain largely unknown. Mass spectrometric analysis uncovered that SOX11 can be post-translationally modified by phosphorylation. Here, we report that phosphorylatable serines surrounding the high-mobility group box modulate SOX11’s transcriptional activity. Through Mass Spectrometry (MS), co-immunoprecipitation assays and in vitro phosphorylation assays followed by MS we verified that protein kinase A (PKA) interacts with SOX11 and phosphorylates it on S133. In vivo replacement of SoxC factors in developing adult-generated hippocampal neurons with SOX11 S133 phospho-mutants indicated that phosphorylation on S133 modulates dendrite development of adult-born dentate granule neurons, while reporter assays suggested that S133 phosphorylation fine-tunes the activation of select target genes. These data provide novel insight into the control of the critical neurodevelopmental regulator SOX11 and imply SOX11 as a mediator of PKA-regulated neuronal development.
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Affiliation(s)
- Elli-Anna Balta
- Institute of Biochemistry, Friedrich-Alexander Universität Erlangen-Nürnberg, 91054, Erlangen, Germany
| | - Iris Schäffner
- Institute of Biochemistry, Friedrich-Alexander Universität Erlangen-Nürnberg, 91054, Erlangen, Germany
| | - Marie-Theres Wittmann
- Institute of Biochemistry, Friedrich-Alexander Universität Erlangen-Nürnberg, 91054, Erlangen, Germany
| | - Elisabeth Sock
- Institute of Biochemistry, Friedrich-Alexander Universität Erlangen-Nürnberg, 91054, Erlangen, Germany
| | - Felix von Zweydorf
- DZNE-German Center for Neurodegenerative Diseases, 72076, Tübingen, Germany
| | - Julia von Wittgenstein
- Institute of Biochemistry, Friedrich-Alexander Universität Erlangen-Nürnberg, 91054, Erlangen, Germany
| | - Kathrin Steib
- Institute of Developmental Genetics, Helmholtz Zentrum München, German Research Center for Environmental Health, 85764, Neuherberg, Germany
| | - Birgit Heim
- University of Tübingen, Institute for Ophthalmic Research, Center for Ophthalmology, 72076, Tübingen, Germany
| | - Elisabeth Kremmer
- Monoclonal Antibody Core Facility, Helmholtz Zentrum München, German Research Center for Environmental Health, 85764, Neuherberg, Germany
| | - Benjamin Martin Häberle
- Institute of Biochemistry, Friedrich-Alexander Universität Erlangen-Nürnberg, 91054, Erlangen, Germany
| | - Marius Ueffing
- University of Tübingen, Institute for Ophthalmic Research, Center for Ophthalmology, 72076, Tübingen, Germany
| | - Dieter Chichung Lie
- Institute of Biochemistry, Friedrich-Alexander Universität Erlangen-Nürnberg, 91054, Erlangen, Germany.
| | - Christian Johannes Gloeckner
- DZNE-German Center for Neurodegenerative Diseases, 72076, Tübingen, Germany. .,University of Tübingen, Institute for Ophthalmic Research, Center for Ophthalmology, 72076, Tübingen, Germany.
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Sciuto MR, Warnken U, Schnölzer M, Valvo C, Brunetto L, Boe A, Biffoni M, Krammer PH, De Maria R, Haas TL. Two-Step Coimmunoprecipitation (TIP) Enables Efficient and Highly Selective Isolation of Native Protein Complexes. Mol Cell Proteomics 2017; 17:993-1009. [PMID: 29217617 DOI: 10.1074/mcp.o116.065920] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2016] [Revised: 11/22/2017] [Indexed: 11/06/2022] Open
Abstract
Coimmunoprecipitation (co-IP) is one of the most frequently used techniques to study protein-protein (PPIs) or protein-nucleic acid interactions (PNIs). However, the presence of coprecipitated contaminants is a well-recognized issue associated with single-step co-IPs. To overcome this limitation, we developed the two-step co-IP (TIP) strategy that enables sequential coimmunoprecipitations of endogenous protein complexes. TIP can be performed with a broad range of mono- and polyclonal antibodies targeting a single protein or different components of a given complex. TIP results in a highly selective enrichment of protein complexes and thus outperforms single-step co-IPs for downstream applications such as mass spectrometry for the identification of PPIs and quantitative PCR for the analysis of PNIs. We benchmarked TIP for the identification of CD95/FAS-interacting proteins in primary human CD4+ T cells, which recapitulated all major known interactors, but also enabled the proteomics discovery of PPM1G and IPO7 as new interaction partners. For its feasibility and high performance, we propose TIP as an advanced tool for the isolation of highly purified protein-protein and protein-nucleic acid complexes under native expression conditions.
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Affiliation(s)
- Maria Rita Sciuto
- From the ‡Department of Hematology and Oncology, Istituto Superiore di Sanità, Viale Regina Elena 299, 00161, Rome, Italy;
| | - Uwe Warnken
- §Functional Proteome Analysis, German Cancer Research Center (DKFZ), Im Neuenheimer Feld 580, 69120, Heidelberg, Germany
| | - Martina Schnölzer
- §Functional Proteome Analysis, German Cancer Research Center (DKFZ), Im Neuenheimer Feld 580, 69120, Heidelberg, Germany
| | - Cecilia Valvo
- From the ‡Department of Hematology and Oncology, Istituto Superiore di Sanità, Viale Regina Elena 299, 00161, Rome, Italy.,¶Institute of General Pathology, Catholic University and Gemelli Polyclinic, Largo F. Vito 1, 00168, Rome, Italy
| | - Lidia Brunetto
- From the ‡Department of Hematology and Oncology, Istituto Superiore di Sanità, Viale Regina Elena 299, 00161, Rome, Italy
| | - Alessandra Boe
- From the ‡Department of Hematology and Oncology, Istituto Superiore di Sanità, Viale Regina Elena 299, 00161, Rome, Italy
| | - Mauro Biffoni
- From the ‡Department of Hematology and Oncology, Istituto Superiore di Sanità, Viale Regina Elena 299, 00161, Rome, Italy
| | - Peter H Krammer
- ‖Department of Tumor Immunology, German Cancer Research Center (DKFZ), Im Neuenheimer Feld 280, 69120, Heidelberg, Germany
| | - Ruggero De Maria
- ¶Institute of General Pathology, Catholic University and Gemelli Polyclinic, Largo F. Vito 1, 00168, Rome, Italy
| | - Tobias L Haas
- From the ‡Department of Hematology and Oncology, Istituto Superiore di Sanità, Viale Regina Elena 299, 00161, Rome, Italy; .,¶Institute of General Pathology, Catholic University and Gemelli Polyclinic, Largo F. Vito 1, 00168, Rome, Italy
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