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Vial A, Costa L, Dosset P, Rosso P, Boutières G, Faklaris O, Haschke H, Milhiet PE, Doucet CM. Structure and mechanics of the human nuclear pore complex basket using correlative AFM-fluorescence superresolution microscopy. Nanoscale 2023; 15:5756-5770. [PMID: 36786384 DOI: 10.1039/d2nr06034e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Nuclear pore complexes (NPCs) are the only gateways between the nucleus and cytoplasm in eukaryotic cells. They restrict free diffusion to molecules below 5 nm while facilitating the active transport of selected cargoes, sometimes as large as the pore itself. This versatility implies an important pore plasticity. Recently, cryo-EM and AI-based protein modeling of human NPC revealed with acute precision how most constituents are arranged. But the basket, a fish trap-like structure capping the nucleoplasmic side of the pore, remains poorly resolved. Here by atomic force microscopy (AFM) coupled to single molecule localization microscopy (SMLM) we revealed that the basket is very soft and explores a large conformational landscape: apart from its canonical basket shape, it dives into the central pore channel or opens, with filaments reaching to the pore sides. Our observations highlight how this structure can adapt and let morphologically diverse cargoes shuttle through NPCs.
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Affiliation(s)
- Anthony Vial
- CBS (Centre de Biologie Structurale), Univ Montpellier, CNRS, INSERM, Montpellier, France.
| | - Luca Costa
- CBS (Centre de Biologie Structurale), Univ Montpellier, CNRS, INSERM, Montpellier, France.
| | - Patrice Dosset
- CBS (Centre de Biologie Structurale), Univ Montpellier, CNRS, INSERM, Montpellier, France.
| | - Pietro Rosso
- CBS (Centre de Biologie Structurale), Univ Montpellier, CNRS, INSERM, Montpellier, France.
| | - Gaëlle Boutières
- CBS (Centre de Biologie Structurale), Univ Montpellier, CNRS, INSERM, Montpellier, France.
| | - Orestis Faklaris
- MRI, Biocampus, University of Montpellier, CNRS, INSERM, Montpellier, France
| | | | | | - Christine M Doucet
- CBS (Centre de Biologie Structurale), Univ Montpellier, CNRS, INSERM, Montpellier, France.
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Reynolds JJ, Vander Wal E, Adams BK, Curran RM, Doucet CM. Does prey density predict characteristics of primiparity in a solitary and specialized predator, the Canada lynx (Lynx canadensis)? CAN J ZOOL 2017. [DOI: 10.1139/cjz-2016-0269] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Age at primiparity is a flexible life-history trait that purportedly responds to changing population dynamics and variable resource abundance. We examined placental scars in yearling Canada lynx (Lynx canadensis (Kerr, 1792)) from the island of Newfoundland and used pregnancy rates and litter sizes to indicate primiparity. We modelled these lynx productivity data with snowshoe hare (Lepus americanus Erxleben, 1777) population attributes using seven multiple a priori competing hypotheses. Hare abundance showed peak, decline, and increase phases, and densities based on capture–mark–recapture estimates ranged from 0.11 to 1.19 hares·ha−1. Overall, yearling pregnancy rate was 23.5% and the model with hare abundance fitted alone had the most support. However, surprisingly hare abundance explained little (6%) variation in yearling pregnancy rate. Mean (±SE) litter size was 3.51 ± 0.27. None of our covariate models provided unequivocal support for predicting yearling litter size. We speculate that individuals may exhibit behavioural plasticity such that they can dampen the impact of primary prey abundance on yearling pregnancy rate by exploiting alternate prey. Furthermore, intraspecific social interactions may provide additional insight into the determinants of pregnancy rate in yearling lynx.
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Affiliation(s)
- John J. Reynolds
- Wildlife Division, Department of Environment and Climate Change, Government of Newfoundland and Labrador, P.O. Box 8700, 308 Brookfield Road, St. John’s, NL A1B 4J6, Canada
| | - Eric Vander Wal
- Department of Biology, Memorial University of Newfoundland, 32 Elizabeth Avenue, St. John’s, NL A1B 3X9, Canada
| | - Barry K. Adams
- Wildlife Division, Department of Environment and Climate Change, Government of Newfoundland and Labrador, P.O. Box 8700, 308 Brookfield Road, St. John’s, NL A1B 4J6, Canada
| | - Richard M. Curran
- Wildlife Division, Department of Environment and Climate Change, Government of Newfoundland and Labrador, P.O. Box 8700, 308 Brookfield Road, St. John’s, NL A1B 4J6, Canada
| | - Christine M. Doucet
- Wildlife Division, Department of Environment and Climate Change, Government of Newfoundland and Labrador, P.O. Box 2007, 117 Riverside Drive, Corner Brook, NL A2H 7S1, Canada
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Doucet CM, Esmery N, de Saint-Jean M, Antonny B. Membrane Curvature Sensing by Amphipathic Helices Is Modulated by the Surrounding Protein Backbone. PLoS One 2015; 10:e0137965. [PMID: 26366573 PMCID: PMC4569407 DOI: 10.1371/journal.pone.0137965] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2015] [Accepted: 08/24/2015] [Indexed: 11/18/2022] Open
Abstract
Membrane curvature is involved in numerous biological pathways like vesicle trafficking, endocytosis or nuclear pore complex assembly. In addition to its topological role, membrane curvature is sensed by specific proteins, enabling the coordination of biological processes in space and time. Amongst membrane curvature sensors are the ALPS (Amphipathic Lipid Packing Sensors). ALPS motifs are short peptides with peculiar amphipathic properties. They are found in proteins targeted to distinct curved membranes, mostly in the early secretory pathway. For instance, the ALPS motif of the golgin GMAP210 binds trafficking vesicles, while the ALPS motif of Nup133 targets nuclear pores. It is not clear if, besides curvature sensitivity, ALPS motifs also provide target specificity, or if other domains in the surrounding protein backbone are involved. To elucidate this aspect, we studied the subcellular localization of ALPS motifs outside their natural protein context. The ALPS motifs of GMAP210 or Nup133 were grafted on artificial fluorescent probes. Importantly, ALPS motifs are held in different positions and these contrasting architectures were mimicked by the fluorescent probes. The resulting chimeras recapitulated the original proteins localization, indicating that ALPS motifs are sufficient to specifically localize proteins. Modulating the electrostatic or hydrophobic content of Nup133 ALPS motif modified its avidity for cellular membranes but did not change its organelle targeting properties. In contrast, the structure of the backbone surrounding the helix strongly influenced targeting. In particular, introducing an artificial coiled-coil between ALPS and the fluorescent protein increased membrane curvature sensitivity. This coiled-coil domain also provided membrane curvature sensitivity to the amphipathic helix of Sar1. The degree of curvature sensitivity within the coiled-coil context remains correlated to the natural curvature sensitivity of the helices. This suggests that the chemistry of ALPS motifs is a key parameter for membrane curvature sensitivity, which can be further modulated by the surrounding protein backbone.
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Affiliation(s)
- Christine M. Doucet
- IPMC, CNRS UMR 7275, 660 route de Valbonne, 06560 –Valbonne, France
- * E-mail:
| | - Nina Esmery
- IPMC, CNRS UMR 7275, 660 route de Valbonne, 06560 –Valbonne, France
| | | | - Bruno Antonny
- IPMC, CNRS UMR 7275, 660 route de Valbonne, 06560 –Valbonne, France
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Doucet CM, Hetzer MW. Nuclear pore biogenesis into an intact nuclear envelope. Chromosoma 2010; 119:469-77. [DOI: 10.1007/s00412-010-0289-2] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2010] [Revised: 07/15/2010] [Accepted: 07/19/2010] [Indexed: 10/19/2022]
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Doucet CM, Talamas JA, Hetzer MW. Cell cycle-dependent differences in nuclear pore complex assembly in metazoa. Cell 2010; 141:1030-41. [PMID: 20550937 DOI: 10.1016/j.cell.2010.04.036] [Citation(s) in RCA: 186] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2009] [Revised: 02/15/2010] [Accepted: 04/06/2010] [Indexed: 12/21/2022]
Abstract
In metazoa, nuclear pore complexes (NPCs) assemble from disassembled precursors into a reforming nuclear envelope (NE) at the end of mitosis and into growing intact NEs during interphase. Here, we show via RNAi-mediated knockdown that ELYS, a nucleoporin critical for the recruitment of the essential Nup107/160 complex to chromatin, is required for NPC assembly at the end of mitosis but not during interphase. Conversely, the transmembrane nucleoporin POM121 is critical for the incorporation of the Nup107/160 complex into new assembly sites specifically during interphase. Strikingly, recruitment of the Nup107/160 complex to an intact NE involves a membrane curvature-sensing domain of its constituent Nup133, which is not required for postmitotic NPC formation. Our results suggest that in organisms with open mitosis, NPCs assemble via two distinct mechanisms to accommodate cell cycle-dependent differences in NE topology.
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Affiliation(s)
- Christine M Doucet
- Salk Institute for Biological Studies, Molecular and Cell Biology Laboratory, 10010 North Torrey Pines Road, La Jolla, 92037 CA, USA
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Meese TM, Lisauskas JB, Doucet CM, Clark NV, Gardner CM, Hull EL, Sum ST, Madden SP, Caplan JD, Goldstein JA, Muller JE. Spectroscopic identification of lipid-rich plaques causing intermediate stenosis: a study in coronary autopsy specimens. Cardiovascular Revascularization Medicine 2008. [DOI: 10.1016/j.carrev.2008.02.026] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Doucet CM, Ball JP. Analysis of Digestion Data: Apparent and True Digestibilities of Foods Eaten by Beavers. American Midland Naturalist 1994. [DOI: 10.2307/2426579] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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