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Flinois A, Méan I, Mutero-Maeda A, Guillemot L, Citi S. Paracingulin recruits CAMSAP3 to tight junctions and regulates microtubule and polarized epithelial cell organization. J Cell Sci 2024; 137:jcs260745. [PMID: 37013686 PMCID: PMC10184829 DOI: 10.1242/jcs.260745] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [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: 10/25/2022] [Accepted: 03/17/2023] [Indexed: 04/05/2023] Open
Abstract
Paracingulin (CGNL1) is recruited to tight junctions (TJs) by ZO-1 and to adherens junctions (AJs) by PLEKHA7. PLEKHA7 has been reported to bind to the microtubule minus-end-binding protein CAMSAP3, to tether microtubules to the AJs. Here, we show that knockout (KO) of CGNL1, but not of PLEKHA7, results in the loss of junctional CAMSAP3 and its redistribution into a cytoplasmic pool both in cultured epithelial cells in vitro and mouse intestinal epithelium in vivo. In agreement, GST pulldown analyses show that CGNL1, but not PLEKHA7, interacts strongly with CAMSAP3, and the interaction is mediated by their respective coiled-coil regions. Ultrastructure expansion microscopy shows that CAMSAP3-capped microtubules are tethered to junctions by the ZO-1-associated pool of CGNL1. The KO of CGNL1 results in disorganized cytoplasmic microtubules and irregular nuclei alignment in mouse intestinal epithelial cells, altered cyst morphogenesis in cultured kidney epithelial cells, and disrupted planar apical microtubules in mammary epithelial cells. Together, these results uncover new functions of CGNL1 in recruiting CAMSAP3 to junctions and regulating microtubule cytoskeleton organization and epithelial cell architecture.
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Affiliation(s)
- Arielle Flinois
- Department of Molecular and Cellular Biology, Faculty of Sciences, University of Geneva, 1205 Geneva, Switzerland
| | - Isabelle Méan
- Department of Molecular and Cellular Biology, Faculty of Sciences, University of Geneva, 1205 Geneva, Switzerland
| | - Annick Mutero-Maeda
- Department of Molecular and Cellular Biology, Faculty of Sciences, University of Geneva, 1205 Geneva, Switzerland
| | - Laurent Guillemot
- Department of Molecular and Cellular Biology, Faculty of Sciences, University of Geneva, 1205 Geneva, Switzerland
| | - Sandra Citi
- Department of Molecular and Cellular Biology, Faculty of Sciences, University of Geneva, 1205 Geneva, Switzerland
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Rouaud F, Huang W, Flinois A, Jain K, Vasileva E, Di Mattia T, Mauperin M, Parry DAD, Dugina V, Chaponnier C, Méan I, Montessuit S, Mutero-Maeda A, Yan J, Citi S. Cingulin and paracingulin tether myosins-2 to junctions to mechanoregulate the plasma membrane. J Cell Biol 2023; 222:214120. [PMID: 37204781 DOI: 10.1083/jcb.202208065] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2022] [Revised: 01/18/2023] [Accepted: 04/05/2023] [Indexed: 05/20/2023] Open
Abstract
The mechanisms that regulate the spatial sorting of nonmuscle myosins-2 (NM2) isoforms and couple them mechanically to the plasma membrane are unclear. Here we show that the cytoplasmic junctional proteins cingulin (CGN) and paracingulin (CGNL1) interact directly with NM2s through their C-terminal coiled-coil sequences. CGN binds strongly to NM2B, and CGNL1 to NM2A and NM2B. Knockout (KO), exogenous expression, and rescue experiments with WT and mutant proteins show that the NM2-binding region of CGN is required for the junctional accumulation of NM2B, ZO-1, ZO-3, and phalloidin-labeled actin filaments, and for the maintenance of tight junction membrane tortuosity and apical membrane stiffness. CGNL1 expression promotes the junctional accumulation of both NM2A and NM2B and its KO results in myosin-dependent fragmentation of adherens junction complexes. These results reveal a mechanism for the junctional localization of NM2A and NM2B and indicate that, by binding to NM2s, CGN and CGNL1 mechanically couple the actomyosin cytoskeleton to junctional protein complexes to mechanoregulate the plasma membrane.
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Affiliation(s)
- Florian Rouaud
- Department of Molecular and Cellular Biology, Faculty of Sciences, University of Geneva, Geneva, Switzerland
| | - Wenmao Huang
- Department of Physics, National University of Singapore, Singapore, Singapore
| | - Arielle Flinois
- Department of Molecular and Cellular Biology, Faculty of Sciences, University of Geneva, Geneva, Switzerland
| | - Kunalika Jain
- Department of Molecular and Cellular Biology, Faculty of Sciences, University of Geneva, Geneva, Switzerland
| | - Ekaterina Vasileva
- Department of Molecular and Cellular Biology, Faculty of Sciences, University of Geneva, Geneva, Switzerland
| | - Thomas Di Mattia
- Department of Molecular and Cellular Biology, Faculty of Sciences, University of Geneva, Geneva, Switzerland
| | - Marine Mauperin
- Department of Molecular and Cellular Biology, Faculty of Sciences, University of Geneva, Geneva, Switzerland
| | - David A D Parry
- School of Natural Sciences, Massey University , Palmerston North, New Zealand
| | - Vera Dugina
- Belozersky Institute of Physico-Chemical Biology, Moscow State University , Moscow, Russia
| | - Christine Chaponnier
- Department of Pathology and Immunology, Faculty of Medicine, University of Geneva, Geneva, Switzerland
| | - Isabelle Méan
- Department of Molecular and Cellular Biology, Faculty of Sciences, University of Geneva, Geneva, Switzerland
| | - Sylvie Montessuit
- Department of Molecular and Cellular Biology, Faculty of Sciences, University of Geneva, Geneva, Switzerland
| | - Annick Mutero-Maeda
- Department of Molecular and Cellular Biology, Faculty of Sciences, University of Geneva, Geneva, Switzerland
| | - Jie Yan
- Department of Physics, National University of Singapore, Singapore, Singapore
- Mechanobiology Institute, National University of Singapore , Singapore, Singapore
| | - Sandra Citi
- Department of Molecular and Cellular Biology, Faculty of Sciences, University of Geneva, Geneva, Switzerland
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