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Homrich M, Es-Saddiki F, Gotthard I, Laurini C, Stein E, Wobst H, Zielinski A, Diestel S. NCAM140 is translocated into the nucleus by an importin-β1-dependent mechanism. Exp Cell Res 2018; 371:372-378. [PMID: 30153455 DOI: 10.1016/j.yexcr.2018.08.031] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2018] [Revised: 08/22/2018] [Accepted: 08/24/2018] [Indexed: 11/19/2022]
Abstract
The neural cell adhesion molecule (NCAM) is important for neural development and for plasticity in adult brain. Previous studies demonstrated a calmodulin-dependent import of a transmembrane fragment of NCAM into the nucleus that regulates gene expression. In a protein macroarray we identified importin-β1 as a potential interaction partner of NCAM's cytoplasmic tail. The interaction was verified and an importin-β1-dependent import of NCAM into the nucleus could be demonstrated using quantitative immunofluorescence analysis. Generation of NCAM deletion mutants revealed that the last amino acids of the cytoplasmic region of NCAM are dispensable whereas other parts of NCAM's cytoplasmic tail take part in its nuclear translocation. With this study we propose an alternative nuclear route for NCAM via the classical importin-mediated import.
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Affiliation(s)
- Mirka Homrich
- Institute of Nutrition and Food Science, Department of Human Metabolomics, University of Bonn, Katzenburgweg 9a, 53115 Bonn, Germany.
| | - Fatema Es-Saddiki
- Institute of Nutrition and Food Science, Department of Human Metabolomics, University of Bonn, Katzenburgweg 9a, 53115 Bonn, Germany.
| | - Ingo Gotthard
- Institute of Nutrition and Food Science, Department of Human Metabolomics, University of Bonn, Katzenburgweg 9a, 53115 Bonn, Germany.
| | - Christine Laurini
- Institute of Nutrition and Food Science, Department of Human Metabolomics, University of Bonn, Katzenburgweg 9a, 53115 Bonn, Germany.
| | - Edda Stein
- Institute of Nutrition and Food Science, Department of Human Metabolomics, University of Bonn, Katzenburgweg 9a, 53115 Bonn, Germany
| | - Hilke Wobst
- Institute of Nutrition and Food Science, Department of Human Metabolomics, University of Bonn, Katzenburgweg 9a, 53115 Bonn, Germany.
| | - Andy Zielinski
- Institute of Nutrition and Food Science, Department of Human Metabolomics, University of Bonn, Katzenburgweg 9a, 53115 Bonn, Germany
| | - Simone Diestel
- Institute of Nutrition and Food Science, Department of Human Metabolomics, University of Bonn, Katzenburgweg 9a, 53115 Bonn, Germany.
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Mutation of a putative MAP kinase consensus site regulates NCAM endocytosis and NCAM-dependent neurite outgrowth. Neurosci Res 2017; 120:28-35. [PMID: 28193531 DOI: 10.1016/j.neures.2017.02.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2016] [Revised: 01/30/2017] [Accepted: 02/03/2017] [Indexed: 11/22/2022]
Abstract
The cytoplasmic domain of the neural cell adhesion molecule NCAM contains several putative serine/threonine phosphorylation sites whose functions are largely unknown. Human NCAM140 (NCAM140) possesses a potential MAP kinase phosphorylation site at threonine (T) 803. The aim of this study was to analyze a possible phosphorylation of NCAM140 by MAP kinases and to identify the functional role of T803. We found that NCAM140 is phosphorylated by the MAP kinase ERK2 in vitro. Exchange of T803 to aspartic acid (D) which mimics constitutive phosphorylation at the respective position resulted in increased endocytosis compared to NCAM140 in neuroblastoma cells and primary neurons. Consistently, NCAM140 endocytosis was inhibited by the MEK inhibitor U0126 in contrast to NCAM140-T803D or NCAM140-T803A endocytosis supporting a role of a potential ERK2 mediated phosphorylation at this site in endocytosis. Furthermore, cells expressing NCAM140-T803D developed significantly shorter neurites than NCAM140 expressing cells indicating that a potential phosphorylation of NCAM by ERK2 also regulates NCAM-dependent neurite outgrowth.
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Brethour D, Mehrabian M, Williams D, Wang X, Ghodrati F, Ehsani S, Rubie EA, Woodgett JR, Sevalle J, Xi Z, Rogaeva E, Schmitt-Ulms G. A ZIP6-ZIP10 heteromer controls NCAM1 phosphorylation and integration into focal adhesion complexes during epithelial-to-mesenchymal transition. Sci Rep 2017; 7:40313. [PMID: 28098160 PMCID: PMC5241876 DOI: 10.1038/srep40313] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2016] [Accepted: 12/02/2016] [Indexed: 01/06/2023] Open
Abstract
The prion protein (PrP) evolved from the subbranch of ZIP metal ion transporters comprising ZIPs 5, 6 and 10, raising the prospect that the study of these ZIPs may reveal insights relevant for understanding the function of PrP. Building on data which suggested PrP and ZIP6 are critical during epithelial-to-mesenchymal transition (EMT), we investigated ZIP6 in an EMT paradigm using ZIP6 knockout cells, mass spectrometry and bioinformatic methods. Reminiscent of PrP, ZIP6 levels are five-fold upregulated during EMT and the protein forms a complex with NCAM1. ZIP6 also interacts with ZIP10 and the two ZIP transporters exhibit interdependency during their expression. ZIP6 contributes to the integration of NCAM1 in focal adhesion complexes but, unlike cells lacking PrP, ZIP6 deficiency does not abolish polysialylation of NCAM1. Instead, ZIP6 mediates phosphorylation of NCAM1 on a cluster of cytosolic acceptor sites. Substrate consensus motif features and in vitro phosphorylation data point toward GSK3 as the kinase responsible, and interface mapping experiments identified histidine-rich cytoplasmic loops within the ZIP6/ZIP10 heteromer as a novel scaffold for GSK3 binding. Our data suggests that PrP and ZIP6 inherited the ability to interact with NCAM1 from their common ZIP ancestors but have since diverged to control distinct posttranslational modifications of NCAM1.
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Affiliation(s)
- Dylan Brethour
- Tanz Centre for Research in Neurodegenerative Diseases, University of Toronto, Ontario, Canada.,Department of Laboratory Medicine &Pathobiology, University of Toronto, Ontario, Canada
| | - Mohadeseh Mehrabian
- Tanz Centre for Research in Neurodegenerative Diseases, University of Toronto, Ontario, Canada.,Department of Laboratory Medicine &Pathobiology, University of Toronto, Ontario, Canada
| | - Declan Williams
- Tanz Centre for Research in Neurodegenerative Diseases, University of Toronto, Ontario, Canada
| | - Xinzhu Wang
- Tanz Centre for Research in Neurodegenerative Diseases, University of Toronto, Ontario, Canada.,Department of Laboratory Medicine &Pathobiology, University of Toronto, Ontario, Canada
| | - Farinaz Ghodrati
- Tanz Centre for Research in Neurodegenerative Diseases, University of Toronto, Ontario, Canada.,Department of Laboratory Medicine &Pathobiology, University of Toronto, Ontario, Canada
| | - Sepehr Ehsani
- Tanz Centre for Research in Neurodegenerative Diseases, University of Toronto, Ontario, Canada.,Whitehead Institute for Biomedical Research, Cambridge, MA, USA
| | - Elizabeth A Rubie
- Lunenfeld-Tanenbaum Research Institute, Mount Sinai Hospital, Toronto, Ontario, Canada
| | - James R Woodgett
- Lunenfeld-Tanenbaum Research Institute, Mount Sinai Hospital, Toronto, Ontario, Canada
| | - Jean Sevalle
- Tanz Centre for Research in Neurodegenerative Diseases, University of Toronto, Ontario, Canada
| | - Zhengrui Xi
- Tanz Centre for Research in Neurodegenerative Diseases, University of Toronto, Ontario, Canada
| | - Ekaterina Rogaeva
- Tanz Centre for Research in Neurodegenerative Diseases, University of Toronto, Ontario, Canada.,Department of Neurology, University of Toronto, Ontario, Canada
| | - Gerold Schmitt-Ulms
- Tanz Centre for Research in Neurodegenerative Diseases, University of Toronto, Ontario, Canada.,Department of Laboratory Medicine &Pathobiology, University of Toronto, Ontario, Canada
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