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Chua XL, Tong CS, Su M, Xǔ XJ, Xiao S, Wu X, Wu M. Competition and synergy of Arp2/3 and formins in nucleating actin waves. Cell Rep 2024; 43:114423. [PMID: 38968072 DOI: 10.1016/j.celrep.2024.114423] [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: 10/23/2023] [Revised: 04/23/2024] [Accepted: 06/14/2024] [Indexed: 07/07/2024] Open
Abstract
Actin assembly and dynamics are crucial for maintaining cell structure and changing physiological states. The broad impact of actin on various cellular processes makes it challenging to dissect the specific role of actin regulatory proteins. Using actin waves that propagate on the cortex of mast cells as a model, we discovered that formins (FMNL1 and mDia3) are recruited before the Arp2/3 complex in actin waves. GTPase Cdc42 interactions drive FMNL1 oscillations, with active Cdc42 and the constitutively active mutant of FMNL1 capable of forming waves on the plasma membrane independently of actin waves. Additionally, the delayed recruitment of Arp2/3 antagonizes FMNL1 and active Cdc42. This antagonism is not due to competition for monomeric actin but rather for their common upstream regulator, active Cdc42, whose levels are negatively regulated by Arp2/3 via SHIP1 recruitment. Collectively, our study highlights the complex feedback loops in the dynamic control of the actin cytoskeletal network.
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Affiliation(s)
- Xiang Le Chua
- Department of Cell Biology, Yale University School of Medicine, New Haven, CT 06510, USA; Department of Biological Sciences, Centre for Bioimaging Sciences, Singapore 117557, Singapore
| | - Chee San Tong
- Department of Cell Biology, Yale University School of Medicine, New Haven, CT 06510, USA; Department of Biological Sciences, Centre for Bioimaging Sciences, Singapore 117557, Singapore
| | - Maohan Su
- Department of Cell Biology, Yale University School of Medicine, New Haven, CT 06510, USA; Department of Biological Sciences, Centre for Bioimaging Sciences, Singapore 117557, Singapore; Mechanobiology Institute, National University of Singapore, Singapore 117411, Singapore
| | - X J Xǔ
- Department of Cell Biology, Yale University School of Medicine, New Haven, CT 06510, USA; Department of Physics, Yale University, New Haven, CT 06511, USA
| | - Shengping Xiao
- Department of Biological Sciences, Centre for Bioimaging Sciences, Singapore 117557, Singapore
| | - Xudong Wu
- School of Life Sciences, Westlake University, Hangzhou 310024, China
| | - Min Wu
- Department of Cell Biology, Yale University School of Medicine, New Haven, CT 06510, USA; Department of Biological Sciences, Centre for Bioimaging Sciences, Singapore 117557, Singapore; Mechanobiology Institute, National University of Singapore, Singapore 117411, Singapore.
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2
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Yang Y, Valencia LA, Lu CH, Nakamoto ML, Tsai CT, Liu C, Yang H, Zhang W, Jahed Z, Lee WR, Santoro F, Liou J, Wu JC, Cui B. Membrane Curvature Promotes ER-PM Contact Formation via Junctophilin-EHD Interactions. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.06.29.601287. [PMID: 38979311 PMCID: PMC11230412 DOI: 10.1101/2024.06.29.601287] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/10/2024]
Abstract
Contact sites between the endoplasmic reticulum (ER) and the plasma membrane (PM) play a crucial role in governing calcium regulation and lipid homeostasis. Despite their significance, the factors regulating their spatial distribution on the PM remain elusive. Inspired by observations in cardiomyocytes, where ER-PM contact sites concentrate on tubular PM invaginations known as transverse tubules (T-tubules), we hypothesize that the PM curvature plays a role in ER-PM contact formation. Through precise control of PM invaginations, we show that PM curvatures locally induce the formation of ER-PM contacts in cardiomyocytes. Intriguingly, the junctophilin family of ER-PM tethering proteins, specifically expressed in excitable cells, is the key player in this process, while the ubiquitously expressed extended synaptotagmin 2 does not show a preference for PM curvature. At the mechanistic level, we find that the low complexity region (LCR) and the MORN motifs of junctophilins can independently bind to the PM, but both the LCR and MORN motifs are required for targeting PM curvatures. By examining the junctophilin interactome, we identify a family of curvature-sensing proteins, Eps15-homology domain containing proteins (EHDs), that interact with the MORN_LCR motifs and facilitate junctophilins' preferential tethering to curved PM. These findings highlight the pivotal role of PM curvature in the formation of ER-PM contacts in cardiomyocytes and unveil a novel mechanism for the spatial regulation of ER-PM contacts through PM curvature modulation.
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Affiliation(s)
- Yang Yang
- Department of Chemistry, Stanford University, Stanford, CA, USA
- Wu-Tsai Neuroscience Institute and ChEM-H Institute, Stanford University; Stanford, CA, USA
| | - Luis A Valencia
- Department of Chemistry, Stanford University, Stanford, CA, USA
- Wu-Tsai Neuroscience Institute and ChEM-H Institute, Stanford University; Stanford, CA, USA
| | - Chih-Hao Lu
- Department of Chemistry, Stanford University, Stanford, CA, USA
- Wu-Tsai Neuroscience Institute and ChEM-H Institute, Stanford University; Stanford, CA, USA
| | - Melissa L Nakamoto
- Department of Chemistry, Stanford University, Stanford, CA, USA
- Wu-Tsai Neuroscience Institute and ChEM-H Institute, Stanford University; Stanford, CA, USA
| | - Ching-Ting Tsai
- Department of Chemistry, Stanford University, Stanford, CA, USA
- Wu-Tsai Neuroscience Institute and ChEM-H Institute, Stanford University; Stanford, CA, USA
| | - Chun Liu
- Stanford Cardiovascular Institute, Stanford University, Stanford, CA, USA
- Present address: Department of Physiology and Medicine, Medical College of Wisconsin, Milwaukee, WI, USA
| | - Huaxiao Yang
- Stanford Cardiovascular Institute, Stanford University, Stanford, CA, USA
- Present address: Department of Biomedical Engineering, University of North Texas, Denton, TX, USA
| | - Wei Zhang
- Department of Chemistry, Stanford University, Stanford, CA, USA
- Wu-Tsai Neuroscience Institute and ChEM-H Institute, Stanford University; Stanford, CA, USA
| | - Zeinab Jahed
- Department of Chemistry, Stanford University, Stanford, CA, USA
- Present address: Department of Nanoengineering, Jacobs School of Engineering, University of California, San Diego, CA, USA
| | - Wan-Ru Lee
- Department of Physiology, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - Francesca Santoro
- Tissue Electronics, Istituto Italiano di Tecnologia, 80125 Naples, Italy
- Faculty of Electrical Engineering and IT, RWTH, Aachen 52074, Germany
- Institute of Biological Information Processing-Bioelectronics, IBI-3, Forschungszentrum, Juelich 52428, Germany
| | - Jen Liou
- Department of Physiology, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - Joseph C Wu
- Stanford Cardiovascular Institute, Stanford University, Stanford, CA, USA
- Department of Medicine (Division of Cardiology), Stanford University, Stanford, CA, USA
- Department of Radiology, Stanford University, Stanford, CA, USA
| | - Bianxiao Cui
- Department of Chemistry, Stanford University, Stanford, CA, USA
- Wu-Tsai Neuroscience Institute and ChEM-H Institute, Stanford University; Stanford, CA, USA
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3
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Zhuang Y, Guo X, Razorenova OV, Miles CE, Zhao W, Shi X. Coaching ribosome biogenesis from the nuclear periphery. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.06.21.597078. [PMID: 38948754 PMCID: PMC11212990 DOI: 10.1101/2024.06.21.597078] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/02/2024]
Abstract
Severe invagination of the nuclear envelope is a hallmark of cancers, aging, neurodegeneration, and infections. However, the outcomes of nuclear invagination remain unclear. This work identified a new function of nuclear invagination: regulating ribosome biogenesis. With expansion microscopy, we observed frequent physical contact between nuclear invaginations and nucleoli. Surprisingly, the higher the invagination curvature, the more ribosomal RNA and pre-ribosomes are made in the contacted nucleolus. By growing cells on nanopillars that generate nuclear invaginations with desired curvatures, we can increase and decrease ribosome biogenesis. Based on this causation, we repressed the ribosome levels in breast cancer and progeria cells by growing cells on low-curvature nanopillars, indicating that overactivated ribosome biogenesis can be rescued by reshaping nuclei. Mechanistically, high-curvature nuclear invaginations reduce heterochromatin and enrich nuclear pore complexes, which promote ribosome biogenesis. We anticipate that our findings will serve as a foundation for further studies on nuclear deformation.
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Affiliation(s)
- Yinyin Zhuang
- Department of Developmental and Cell Biology, University of California, Irvine; Irvine, CA 92697, United States
| | - Xiangfu Guo
- School of Chemistry, Chemical Engineering and Biotechnology, Nanyang Technological University; Singapore 637459, Singapore
| | - Olga V. Razorenova
- Department of Molecular Biology and Biochemistry, University of California, Irvine; Irvine, CA 92697, United States
| | - Christopher E. Miles
- Department of Mathematics, University of California, Irvine; Irvine, CA 92697, United States
| | - Wenting Zhao
- School of Chemistry, Chemical Engineering and Biotechnology, Nanyang Technological University; Singapore 637459, Singapore
| | - Xiaoyu Shi
- Department of Developmental and Cell Biology, University of California, Irvine; Irvine, CA 92697, United States
- Department of Chemistry, University of California, Irvine; Irvine, CA 92697, United States
- Department of Biomedical Engineering, University of California, Irvine; Irvine, CA 92697, United States
- Lead contact
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4
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Johnson DH, Kou OH, Bouzos N, Zeno WF. Protein-membrane interactions: sensing and generating curvature. Trends Biochem Sci 2024; 49:401-416. [PMID: 38508884 PMCID: PMC11069444 DOI: 10.1016/j.tibs.2024.02.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2023] [Revised: 02/20/2024] [Accepted: 02/23/2024] [Indexed: 03/22/2024]
Abstract
Biological membranes are integral cellular structures that can be curved into various geometries. These curved structures are abundant in cells as they are essential for various physiological processes. However, curved membranes are inherently unstable, especially on nanometer length scales. To stabilize curved membranes, cells can utilize proteins that sense and generate membrane curvature. In this review, we summarize recent research that has advanced our understanding of interactions between proteins and curved membrane surfaces, as well as work that has expanded our ability to study curvature sensing and generation. Additionally, we look at specific examples of cellular processes that require membrane curvature, such as neurotransmission, clathrin-mediated endocytosis (CME), and organelle biogenesis.
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Affiliation(s)
- David H Johnson
- Mork Family Department of Chemical Engineering and Materials Science, University of Southern California, Los Angeles, CA 90089, USA
| | - Orianna H Kou
- Department of Physics and Astronomy, University of Southern California, Los Angeles, CA 90089, USA
| | - Nicoletta Bouzos
- Mork Family Department of Chemical Engineering and Materials Science, University of Southern California, Los Angeles, CA 90089, USA
| | - Wade F Zeno
- Mork Family Department of Chemical Engineering and Materials Science, University of Southern California, Los Angeles, CA 90089, USA.
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5
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Zhu K, Guo X, Chandrasekaran A, Miao X, Rangamani P, Zhao W, Miao Y. Membrane curvature catalyzes actin nucleation through nano-scale condensation of N-WASP-FBP17. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.04.25.591054. [PMID: 38712166 PMCID: PMC11071460 DOI: 10.1101/2024.04.25.591054] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2024]
Abstract
Actin remodeling is spatiotemporally regulated by surface topographical cues on the membrane for signaling across diverse biological processes. Yet, the mechanism dynamic membrane curvature prompts quick actin cytoskeletal changes in signaling remain elusive. Leveraging the precision of nanolithography to control membrane curvature, we reconstructed catalytic reactions from the detection of nano-scale curvature by sensing molecules to the initiation of actin polymerization, which is challenging to study quantitatively in living cells. We show that this process occurs via topographical signal-triggered condensation and activation of the actin nucleation-promoting factor (NPF), Neuronal Wiskott-Aldrich Syndrome protein (N-WASP), which is orchestrated by curvature-sensing BAR-domain protein FBP17. Such N-WASP activation is fine-tuned by optimizing FBP17 to N-WASP stoichiometry over different curvature radii, allowing a curvature-guided macromolecular assembly pattern for polymerizing actin network locally. Our findings shed light on the intricate relationship between changes in curvature and actin remodeling via spatiotemporal regulation of NPF/BAR complex condensation.
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6
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Beck M, Covino R, Hänelt I, Müller-McNicoll M. Understanding the cell: Future views of structural biology. Cell 2024; 187:545-562. [PMID: 38306981 DOI: 10.1016/j.cell.2023.12.017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2023] [Revised: 12/05/2023] [Accepted: 12/11/2023] [Indexed: 02/04/2024]
Abstract
Determining the structure and mechanisms of all individual functional modules of cells at high molecular detail has often been seen as equal to understanding how cells work. Recent technical advances have led to a flush of high-resolution structures of various macromolecular machines, but despite this wealth of detailed information, our understanding of cellular function remains incomplete. Here, we discuss present-day limitations of structural biology and highlight novel technologies that may enable us to analyze molecular functions directly inside cells. We predict that the progression toward structural cell biology will involve a shift toward conceptualizing a 4D virtual reality of cells using digital twins. These will capture cellular segments in a highly enriched molecular detail, include dynamic changes, and facilitate simulations of molecular processes, leading to novel and experimentally testable predictions. Transferring biological questions into algorithms that learn from the existing wealth of data and explore novel solutions may ultimately unveil how cells work.
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Affiliation(s)
- Martin Beck
- Max Planck Institute of Biophysics, Max-von-Laue-Straße 3, 60438 Frankfurt am Main, Germany; Goethe University Frankfurt, Frankfurt, Germany.
| | - Roberto Covino
- Frankfurt Institute for Advanced Studies, Ruth-Moufang-Straße 1, 60438 Frankfurt am Main, Germany.
| | - Inga Hänelt
- Goethe University Frankfurt, Frankfurt, Germany.
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7
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Ledoux B, Zanin N, Yang J, Mercier V, Coster C, Dupont-Gillain C, Alsteens D, Morsomme P, Renard HF. Plasma membrane nanodeformations promote actin polymerization through CIP4/CDC42 recruitment and regulate type II IFN signaling. SCIENCE ADVANCES 2023; 9:eade1660. [PMID: 38091386 PMCID: PMC10848735 DOI: 10.1126/sciadv.ade1660] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2022] [Accepted: 11/10/2023] [Indexed: 12/18/2023]
Abstract
In their environment, cells must cope with mechanical stresses constantly. Among these, nanoscale deformations of plasma membrane induced by substrate nanotopography are now largely accepted as a biophysical stimulus influencing cell behavior and function. However, the mechanotransduction cascades involved and their precise molecular effects on cellular physiology are still poorly understood. Here, using homemade fluorescent nanostructured cell culture surfaces, we explored the role of Bin/Amphiphysin/Rvs (BAR) domain proteins as mechanosensors of plasma membrane geometry. Our data reveal that distinct subsets of BAR proteins bind to plasma membrane deformations in a membrane curvature radius-dependent manner. Furthermore, we show that membrane curvature promotes the formation of dynamic actin structures mediated by the Rho GTPase CDC42, the F-BAR protein CIP4, and the presence of PI(4,5)P2. In addition, these actin-enriched nanodomains can serve as platforms to regulate receptor signaling as they appear to contain interferon-γ receptor (IFNγ-R) and to lead to the partial inhibition of IFNγ-induced JAK/STAT signaling.
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Affiliation(s)
- Benjamin Ledoux
- UCLouvain, Louvain Institute of Biomolecular Science and Technology, Group of Molecular Physiology, Croix du Sud 4-5 bte L7.07.14, Louvain-la-Neuve 1348, Belgium
- UCLouvain, Louvain Institute of Biomolecular Science and Technology, NanoBiophysics lab, Croix du Sud 4-5 bte L7.07.07, Louvain-la-Neuve 1348, Belgium
- UNamur, Morph-Im platform, Rue de Bruxelles 61, Namur 5000, Belgium
| | - Natacha Zanin
- UNamur, NAmur Research Institute for LIfe Sciences, Unité de Recherche en Biologie Cellulaire animale, Rue de Bruxelles 61, Namur 5000, Belgium
| | - Jinsung Yang
- Gyeongsang National University, Department of Biochemistry, College of Medicine, Department of Convergence Medical Sciences, Institute of Medical Science, Jinju 52727, South Korea
| | - Vincent Mercier
- Department of Biochemistry, University of Geneva, Geneva, Switzerland
| | - Charlotte Coster
- UCLouvain, Louvain Institute of Biomolecular Science and Technology, Group of Molecular Physiology, Croix du Sud 4-5 bte L7.07.14, Louvain-la-Neuve 1348, Belgium
| | - Christine Dupont-Gillain
- UCLouvain, Institute of Condensed Matter and Nanosciences, Bio- and Soft Matter, Place Louis Pasteur 1 bte L4.01.10, Louvain-la-Neuve 1348, Belgium
| | - David Alsteens
- UCLouvain, Louvain Institute of Biomolecular Science and Technology, NanoBiophysics lab, Croix du Sud 4-5 bte L7.07.07, Louvain-la-Neuve 1348, Belgium
| | - Pierre Morsomme
- UCLouvain, Louvain Institute of Biomolecular Science and Technology, Group of Molecular Physiology, Croix du Sud 4-5 bte L7.07.14, Louvain-la-Neuve 1348, Belgium
| | - Henri-François Renard
- UNamur, Morph-Im platform, Rue de Bruxelles 61, Namur 5000, Belgium
- UNamur, NAmur Research Institute for LIfe Sciences, Unité de Recherche en Biologie Cellulaire animale, Rue de Bruxelles 61, Namur 5000, Belgium
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8
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Yu Y, Yoshimura SH. Self-assembly of CIP4 drives actin-mediated asymmetric pit-closing in clathrin-mediated endocytosis. Nat Commun 2023; 14:4602. [PMID: 37528083 PMCID: PMC10393992 DOI: 10.1038/s41467-023-40390-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2022] [Accepted: 07/23/2023] [Indexed: 08/03/2023] Open
Abstract
Clathrin-mediated endocytosis is pivotal to signal transduction pathways between the extracellular environment and the intracellular space. Evidence from live-cell imaging and super-resolution microscopy of mammalian cells suggests an asymmetric distribution of actin fibres near the clathrin-coated pit, which induces asymmetric pit-closing rather than radial constriction. However, detailed molecular mechanisms of this 'asymmetricity' remain elusive. Herein, we used high-speed atomic force microscopy to demonstrate that CIP4, a multi-domain protein with a classic F-BAR domain and intrinsically disordered regions, is necessary for asymmetric pit-closing. Strong self-assembly of CIP4 via intrinsically disordered regions, together with stereospecific interactions with the curved membrane and actin-regulating proteins, generates a small actin-rich environment near the pit, which deforms the membrane and closes the pit. Our results provide mechanistic insights into how disordered and structured domain collaboration promotes spatio-temporal actin polymerisation near the plasma membrane.
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Affiliation(s)
- Yiming Yu
- Graduate School of Biostudies, Kyoto University, Kyoto, 606-8501, Japan
| | - Shige H Yoshimura
- Graduate School of Biostudies, Kyoto University, Kyoto, 606-8501, Japan.
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9
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Lu CH, Tsai CT, Jones Iv T, Chim V, Klausen LH, Zhang W, Li X, Jahed Z, Cui B. A NanoCurvS platform for quantitative and multiplex analysis of curvature-sensing proteins. Biomater Sci 2023; 11:5205-5217. [PMID: 37337788 PMCID: PMC10809791 DOI: 10.1039/d2bm01856j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/21/2023]
Abstract
The cell membrane is characterized by a rich variety of topographical features such as local protrusions or invaginations. Curvature-sensing proteins, including the Bin/Amphiphysin/Rvs (BAR) or epsin N-terminal homology (ENTH) family proteins, sense the bending sharpness and the positive/negative sign of these topographical features to induce subsequent intracellular signaling. A number of assays have been developed to study curvature-sensing properties of proteins in vitro, but it is still challenging to probe low curvature regime with the diameter of curvature from hundreds of nanometers to micrometers. It is particularly difficult to generate negative membrane curvatures with well-defined curvature values in the low curvature regime. In this work, we develop a nanostructure-based curvature sensing (NanoCurvS) platform that enables quantitative and multiplex analysis of curvature-sensitive proteins in the low curvature regime, in both negative and positive directions. We use NanoCurvS to quantitatively measure the sensing range of a negative curvature-sensing protein IRSp53 (an I-BAR protein) and a positive curvature-sensing protein FBP17 (an F-BAR protein). We find that, in cell lysates, the I-BAR domain of IRSp53 is able to sense shallow negative curvatures with the diameter-of-curvature up to 1500 nm, a range much wider than previously expected. NanoCurvS is also used to probe the autoinhibition effect of IRSp53 and the phosphorylation effect of FBP17. Therefore, the NanoCurvS platform provides a robust, multiplex, and easy-to-use tool for quantitative analysis of both positive and negative curvature-sensing proteins.
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Affiliation(s)
- Chih-Hao Lu
- Department of Chemistry, Stanford University, Stanford, CA, USA.
| | - Ching-Ting Tsai
- Department of Chemistry, Stanford University, Stanford, CA, USA.
| | - Taylor Jones Iv
- Department of Chemistry, Stanford University, Stanford, CA, USA.
| | - Vincent Chim
- Department of Chemistry, Stanford University, Stanford, CA, USA.
| | - Lasse H Klausen
- Department of Chemistry, Stanford University, Stanford, CA, USA.
| | - Wei Zhang
- Department of Chemistry, Stanford University, Stanford, CA, USA.
| | - Xiao Li
- Department of Chemistry, Stanford University, Stanford, CA, USA.
| | - Zeinab Jahed
- Department of Chemistry, Stanford University, Stanford, CA, USA.
| | - Bianxiao Cui
- Department of Chemistry, Stanford University, Stanford, CA, USA.
- Wu-Tsai Neuroscience Institute and ChEM-H institute, Stanford University, Stanford, CA, USA
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10
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Guo X, Zhu K, Zhu X, Zhao W, Miao Y. Two-dimensional molecular condensation in cell signaling and mechanosensing. Acta Biochim Biophys Sin (Shanghai) 2023; 55:1064-1074. [PMID: 37475548 PMCID: PMC10423693 DOI: 10.3724/abbs.2023132] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2023] [Accepted: 05/21/2023] [Indexed: 07/22/2023] Open
Abstract
Membraneless organelles (MLO) regulate diverse biological processes in a spatiotemporally controlled manner spanning from inside to outside of the cells. The plasma membrane (PM) at the cell surface serves as a central platform for forming multi-component signaling hubs that sense mechanical and chemical cues during physiological and pathological conditions. During signal transduction, the assembly and formation of membrane-bound MLO are dynamically tunable depending on the physicochemical properties of the surrounding environment and partitioning biomolecules. Biomechanical properties of MLO-associated membrane structures can control the microenvironment for biomolecular interactions and assembly. Lipid-protein complex interactions determine the catalytic region's assembly pattern and assembly rate and, thereby, the amplitude of activities. In this review, we will focus on how cell surface microenvironments, including membrane curvature, surface topology and tension, lipid-phase separation, and adhesion force, guide the assembly of PM-associated MLO for cell signal transductions.
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Affiliation(s)
- Xiangfu Guo
- School of ChemistryChemical Engineering and BiotechnologyNanyang Technological UniversitySingapore637457Singapore
| | - Kexin Zhu
- School of Biological SciencesNanyang Technological UniversitySingapore637551Singapore
| | - Xinlu Zhu
- School of Biological SciencesNanyang Technological UniversitySingapore637551Singapore
| | - Wenting Zhao
- School of ChemistryChemical Engineering and BiotechnologyNanyang Technological UniversitySingapore637457Singapore
- Institute for Digital Molecular Analytics and ScienceNanyang Technological UniversitySingapore636921Singapore
| | - Yansong Miao
- School of Biological SciencesNanyang Technological UniversitySingapore637551Singapore
- Institute for Digital Molecular Analytics and ScienceNanyang Technological UniversitySingapore636921Singapore
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11
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Membrane curvature governs the distribution of Piezo1 in live cells. Nat Commun 2022; 13:7467. [PMID: 36463216 PMCID: PMC9719557 DOI: 10.1038/s41467-022-35034-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2022] [Accepted: 11/16/2022] [Indexed: 12/05/2022] Open
Abstract
Piezo1 is a bona fide mechanosensitive ion channel ubiquitously expressed in mammalian cells. The distribution of Piezo1 within a cell is essential for various biological processes including cytokinesis, cell migration, and wound healing. However, the underlying principles that guide the subcellular distribution of Piezo1 remain largely unexplored. Here, we demonstrate that membrane curvature serves as a key regulator of the spatial distribution of Piezo1 in the plasma membrane of living cells. Piezo1 depletes from highly curved membrane protrusions such as filopodia and enriches to nanoscale membrane invaginations. Quantification of the curvature-dependent sorting of Piezo1 directly reveals the in situ nano-geometry of the Piezo1-membrane complex. Piezo1 density on filopodia increases upon activation, independent of calcium, suggesting flattening of the channel upon opening. Consequently, the expression of Piezo1 inhibits filopodia formation, an effect that diminishes with channel activation.
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12
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Lu CH, Pedram K, Tsai CT, Jones T, Li X, Nakamoto ML, Bertozzi CR, Cui B. Membrane curvature regulates the spatial distribution of bulky glycoproteins. Nat Commun 2022; 13:3093. [PMID: 35654773 PMCID: PMC9163104 DOI: 10.1038/s41467-022-30610-2] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2021] [Accepted: 05/10/2022] [Indexed: 01/11/2023] Open
Abstract
The glycocalyx is a shell of heavily glycosylated proteins and lipids distributed on the cell surface of nearly all cell types. Recently, it has been found that bulky transmembrane glycoproteins such as MUC1 can modulate membrane shape by inducing membrane protrusions. In this work, we examine the reciprocal relationship of how membrane shape affects MUC1's spatial distribution on the cell membrane and its biological significance. By employing nanopatterned surfaces and membrane-sculpting proteins to manipulate membrane curvature, we show that MUC1 avoids positively-curved membranes (membrane invaginations) and accumulates on negatively-curved membranes (membrane protrusions). MUC1's curvature sensitivity is dependent on the length and the extent of glycosylation of its ectodomain, with large and highly glycosylated forms preferentially staying out of positive curvature. Interestingly, MUC1's avoidance of positive membrane curvature enables it to escape from endocytosis and being removed from the cell membrane. These findings also suggest that the truncation of MUC1's ectodomain, often observed in breast and ovarian cancers, may enhance its endocytosis and potentiate its intracellular accumulation and signaling.
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Affiliation(s)
- Chih-Hao Lu
- grid.168010.e0000000419368956Department of Chemistry, Stanford University, Stanford, CA 94305 USA
| | - Kayvon Pedram
- grid.168010.e0000000419368956Department of Chemistry, Stanford University, Stanford, CA 94305 USA ,grid.443970.dPresent Address: Janelia Research Campus, Howard Hughes Medical Institute, Ashburn, VA 20147 USA
| | - Ching-Ting Tsai
- grid.168010.e0000000419368956Department of Chemistry, Stanford University, Stanford, CA 94305 USA
| | - Taylor Jones
- grid.168010.e0000000419368956Department of Chemistry, Stanford University, Stanford, CA 94305 USA
| | - Xiao Li
- grid.168010.e0000000419368956Department of Chemistry, Stanford University, Stanford, CA 94305 USA ,grid.43169.390000 0001 0599 1243Present Address: School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an, China
| | - Melissa L. Nakamoto
- grid.168010.e0000000419368956Department of Chemistry, Stanford University, Stanford, CA 94305 USA
| | - Carolyn R. Bertozzi
- grid.168010.e0000000419368956Department of Chemistry, Stanford University, Stanford, CA 94305 USA ,grid.168010.e0000000419368956Stanford ChEM-H, Stanford University, Stanford, CA 94305 USA ,grid.168010.e0000000419368956Howard Hughes Medical Institute, Stanford University, Stanford, CA 94305 USA
| | - Bianxiao Cui
- grid.168010.e0000000419368956Department of Chemistry, Stanford University, Stanford, CA 94305 USA
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13
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Insights into Membrane Curvature Sensing and Membrane Remodeling by Intrinsically Disordered Proteins and Protein Regions. J Membr Biol 2022; 255:237-259. [PMID: 35451616 PMCID: PMC9028910 DOI: 10.1007/s00232-022-00237-x] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2022] [Accepted: 03/29/2022] [Indexed: 12/15/2022]
Abstract
Cellular membranes are highly dynamic in shape. They can rapidly and precisely regulate their shape to perform various cellular functions. The protein’s ability to sense membrane curvature is essential in various biological events such as cell signaling and membrane trafficking. As they are bound, these curvature-sensing proteins may also change the local membrane shape by one or more curvature driving mechanisms. Established curvature-sensing/driving mechanisms rely on proteins with specific structural features such as amphipathic helices and intrinsically curved shapes. However, the recent discovery and characterization of many proteins have shattered the protein structure–function paradigm, believing that the protein functions require a unique structural feature. Typically, such structure-independent functions are carried either entirely by intrinsically disordered proteins or hybrid proteins containing disordered regions and structured domains. It is becoming more apparent that disordered proteins and regions can be potent sensors/inducers of membrane curvatures. In this article, we outline the basic features of disordered proteins and regions, the motifs in such proteins that encode the function, membrane remodeling by disordered proteins and regions, and assays that may be employed to investigate curvature sensing and generation by ordered/disordered proteins.
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Zeng Y, Ramani PD, Gao W, Zhao W. Revealing the heterogeneity in neuroblastoma cells via nanopillar-guided subnuclear deformation. NANOSCALE 2022; 14:2617-2627. [PMID: 35133394 DOI: 10.1039/d1nr04996h] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Neuroblastoma is a hard-to-treat childhood cancer that is well known for the heterogeneity of its clinical phenotypes. Although the risk levels of neuroblastoma have been defined from a complex matrix of clinical and tumor biological factors to guide treatment, the accuracy in predicting cancer relapse and related fatality is still poor in many cases, where heterogeneity with subpopulations in highly malignant or drug-resistant tumors is believed to be underestimated by the current analysis methods. Therefore, new technologies to probe neuroblastoma heterogeneity are needed for the improvement of risk stratification. In this study, we introduce the nanopillar-guided subnuclear morphology as an effective indicator for heterogeneity evaluation among individual neuroblastoma cells. Nuclear polymorphisms, especially the generation of subnuclear irregularities, are well-known markers of high cancer metastasis risk and poor prognosis. By quantitatively evaluating the orientation of nanopillar-guided nuclear envelope features in neuroblastoma cells, we identified two subpopulations with differential motilities and EMT marker levels. Moreover, with endogenous expression, cells with high levels of the nuclear structure protein lamin A exhibit anisotropic deformation on nanopillars and migrate faster than low-lamin A cells, indicating a greater potential for metastasis. Overexpression of lamin A, however, reduces both the coherency and migration speed, suggesting that subpopulations with similar lamin A levels may have different metastatic potentials. We further verified that nanopillar-generated nuclear deformation patterns can quantitatively reveal individual cells' responses to anti-cancer drug treatment. Overall, we envision that the nanopillar-based assessment of subnuclear irregularities brings new additions to our toolkits for both precise risk stratification in neuroblastoma and the evaluation of related anti-cancer therapeutics.
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Affiliation(s)
- Yongpeng Zeng
- School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore 637457, Singapore.
| | - Priya Dharshana Ramani
- School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore 637457, Singapore.
| | - Weibo Gao
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 639798 Singapore, Singapore
- The Photonics Institute and Centre for Disruptive Photonic Technologies, Nanyang Technological University, 639798 Singapore, Singapore
| | - Wenting Zhao
- School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore 637457, Singapore.
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15
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El Alaoui F, Casuso I, Sanchez-Fuentes D, Arpin-Andre C, Rathar R, Baecker V, Castro A, Lorca T, Viaud J, Vassilopoulos S, Carretero-Genevrier A, Picas L. Structural organization and dynamics of FCHo2 docking on membranes. eLife 2022; 11:e73156. [PMID: 35044298 PMCID: PMC8798043 DOI: 10.7554/elife.73156] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2021] [Accepted: 01/18/2022] [Indexed: 11/24/2022] Open
Abstract
Clathrin-mediated endocytosis (CME) is a central trafficking pathway in eukaryotic cells regulated by phosphoinositides. The plasma membrane phosphatidylinositol-4,5-bisphosphate (PI(4,5)P2) plays an instrumental role in driving CME initiation. The F-BAR domain-only protein 1 and 2 complex (FCHo1/2) is among the early proteins that reach the plasma membrane, but the exact mechanisms triggering its recruitment remain elusive. Here, we show the molecular dynamics of FCHo2 self-assembly on membranes by combining minimal reconstituted in vitro and cellular systems. Our results indicate that PI(4,5)P2 domains assist FCHo2 docking at specific membrane regions, where it self-assembles into ring-like-shaped protein patches. We show that the binding of FCHo2 on cellular membranes promotes PI(4,5)P2 clustering at the boundary of cargo receptors and that this accumulation enhances clathrin assembly. Thus, our results provide a mechanistic framework that could explain the recruitment of early PI(4,5)P2-interacting proteins at endocytic sites.
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Affiliation(s)
- Fatima El Alaoui
- Institut de Recherche en Infectiologie de Montpellier (IRIM), CNRS UMR 9004, Université de MontpellierMontpellierFrance
| | | | - David Sanchez-Fuentes
- Institut d'Électronique et des Systèmes (IES), CNRS UMR 5214, Université de MontpellierMontpellierFrance
| | - Charlotte Arpin-Andre
- Institut de Recherche en Infectiologie de Montpellier (IRIM), CNRS UMR 9004, Université de MontpellierMontpellierFrance
| | - Raissa Rathar
- Institut d'Électronique et des Systèmes (IES), CNRS UMR 5214, Université de MontpellierMontpellierFrance
| | - Volker Baecker
- Montpellier Ressources Imagerie, BioCampus Montpellier, CNRS, INSERM, Université de MontpellierMontpellierFrance
| | - Anna Castro
- Centre de Biologie Cellulaire de Montpellier (CRBM), CNRS UMR UMR 5237, Université de MontpellierMontpellierFrance
| | - Thierry Lorca
- Centre de Biologie Cellulaire de Montpellier (CRBM), CNRS UMR UMR 5237, Université de MontpellierMontpellierFrance
| | - Julien Viaud
- INSERM UMR1297, Institute of Metabolic and Cardiovascular Diseases (I2MC), University of Toulouse, Paul Sabatier UniversityToulouseFrance
| | - Stéphane Vassilopoulos
- Sorbonne Université, INSERM, Institute of Myology, Centre of Research in Myology, UMRS 974ParisFrance
| | - Adrian Carretero-Genevrier
- Institut d'Électronique et des Systèmes (IES), CNRS UMR 5214, Université de MontpellierMontpellierFrance
| | - Laura Picas
- Institut de Recherche en Infectiologie de Montpellier (IRIM), CNRS UMR 9004, Université de MontpellierMontpellierFrance
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Sp1-Induced FNBP1 Drives Rigorous 3D Cell Motility in EMT-Type Gastric Cancer Cells. Int J Mol Sci 2021; 22:ijms22136784. [PMID: 34202606 PMCID: PMC8267707 DOI: 10.3390/ijms22136784] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2021] [Revised: 06/21/2021] [Accepted: 06/21/2021] [Indexed: 12/11/2022] Open
Abstract
Cancer is heterogeneous among patients, requiring a thorough understanding of molecular subtypes and the establishment of therapeutic strategies based on its behavior. Gastric cancer (GC) is adenocarcinoma with marked heterogeneity leading to different prognoses. As an effort, we previously identified a stem-like subtype, which is prone to metastasis, with the worst prognosis. Here, we propose FNBP1 as a key to high-level cell motility, present only in aggressive GC cells. FNBP1 is also up-regulated in both the GS subtype from the TCGA project and the EMT subtype from the ACRG study, which include high portions of diffuse histologic type. Ablation of FNBP1 in the EMT-type GC cell line brought changes in the cell periphery in transcriptomic analysis. Indeed, loss of FNBP1 resulted in the loss of invasive ability, especially in a three-dimensional culture system. Live imaging indicated active movement of actin in FNBP1-overexpressed cells cultured in an extracellular matrix dome. To find the transcription factor which drives FNBP1 expression in an EMT-type GC cell line, the FNBP1 promoter region and DNA binding motifs were analyzed. Interestingly, the Sp1 motif was abundant in the promoter, and pharmacological inhibition and knockdown of Sp1 down-regulated FNBP1 promoter activity and the transcription level, respectively. Taken together, our results propose Sp1-driven FNBP1 as a key molecule explaining aggressiveness in EMT-type GC cells.
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