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Chen X, Arciola JM, Lee YI, Wong PHP, Yin H, Tao Q, Jin Y, Qin X, Sweeney HL, Park H. Myo10 tail is crucial for promoting long filopodia. J Biol Chem 2024; 300:105523. [PMID: 38043799 PMCID: PMC10790087 DOI: 10.1016/j.jbc.2023.105523] [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: 07/03/2023] [Revised: 11/22/2023] [Accepted: 11/24/2023] [Indexed: 12/05/2023] Open
Abstract
Filopodia are slender cellular protrusions containing parallel actin bundles involved in environmental sensing and signaling, cell adhesion and migration, and growth cone guidance and extension. Myosin 10 (Myo10), an unconventional actin-based motor protein, was reported to induce filopodial initiation with its motor domain. However, the roles of the multifunctional tail domain of Myo10 in filopodial formation and elongation remain elusive. Herein, we generated several constructs of Myo10-full-length Myo10, Myo10 with a truncated tail (Myo10 HMM), and Myo10 containing four mutations to disrupt its coiled-coil domain (Myo10 CC mutant). We found that the truncation of the tail domain decreased filopodial formation and filopodial length, while four mutations in the coiled-coil domain disrupted the motion of Myo10 toward filopodial tips and the elongation of filopodia. Furthermore, we found that filopodia elongated through multiple elongation cycles, which was supported by the Myo10 tail. These findings suggest that Myo10 tail is crucial for promoting long filopodia.
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Affiliation(s)
- Xingxiang Chen
- Division of Life Science, The Hong Kong University of Science and Technology, Kowloon, Hong Kong, China
| | | | - Young Il Lee
- Department of Pharmacology & Therapeutics, University of Florida College of Medicine, Gainesville, USA
| | - Pak Hung Philip Wong
- Department of Physics, The Hong Kong University of Science and Technology, Kowloon, Hong Kong, China
| | - Haoran Yin
- Division of Life Science, The Hong Kong University of Science and Technology, Kowloon, Hong Kong, China
| | - Quanqing Tao
- Department of Physics, The Hong Kong University of Science and Technology, Kowloon, Hong Kong, China
| | - Yuqi Jin
- Department of Physics, The Hong Kong University of Science and Technology, Kowloon, Hong Kong, China
| | - Xianan Qin
- Department of Physics, The Hong Kong University of Science and Technology, Kowloon, Hong Kong, China
| | - H Lee Sweeney
- Department of Pharmacology & Therapeutics, University of Florida College of Medicine, Gainesville, USA; Myology Institute, University of Florida College of Medicine, Gainesville, Florida, USA.
| | - Hyokeun Park
- Division of Life Science, The Hong Kong University of Science and Technology, Kowloon, Hong Kong, China; Department of Physics, The Hong Kong University of Science and Technology, Kowloon, Hong Kong, China; State Key Laboratory of Molecular Neuroscience, The Hong Kong University of Science and Technology, Kowloon, Hong Kong, China.
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Tu Z, Song C, Qin X. A numerical method for resolving finite mixtures of three-dimensional inter-site distance distributions measured by single-molecule localization microscopy. Microscopy (Oxf) 2023; 72:43-48. [PMID: 36264216 DOI: 10.1093/jmicro/dfac052] [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: 09/19/2022] [Revised: 10/14/2022] [Accepted: 10/17/2022] [Indexed: 11/14/2022] Open
Abstract
The three-dimensional (3D) inter-site distance can be measured by single-molecule localization microscopy. Existing theories and analysis tools for 3D inter-site distance measurement only consider the simplest case where all measured distances are from an identical 3D Rician distribution. There are many problems where the 3D inter-site distance measurement result is made up of multiple components, for example, the measurement of intramolecular distances of deoxyribonucleic acid with multiple possible conformations. In these cases, the overall distance distributions become finite mixtures of 3D Rician distributions (or 3D Rician mixtures). Here, we provide a numerical method using the 3D Rician mixture model to resolve the finite 3D inter-site distance mixtures, which is based on the expectation-maximization algorithm. The proposed method has been tested on simulation data of finite 3D inter-site distance mixtures. The result using the Gaussian mixture model in the developed method is also discussed for comparison.
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Affiliation(s)
- Zhiwen Tu
- National Engineering Lab of Textile Fiber Materials & Processing Technology, Zhejiang Sci-Tech University, Hangzhou 310018, China
| | - Congwei Song
- Yanqi Lake Beijing Institute of Mathematical Sciences and Applications (BIMSA), Beijing 101408, China
| | - Xianan Qin
- National Engineering Lab of Textile Fiber Materials & Processing Technology, Zhejiang Sci-Tech University, Hangzhou 310018, China.,School of Material Science and Engineering, Zhejiang Sci-Tech University, Hangzhou 310018, China.,Zhejiang Provincial Innovation Center of Advanced Textile Technology, Shaoxing 312000, China
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Chen X, Liu T, Qin X, Nguyen QQ, Lee SK, Lee C, Ren Y, Chu J, Zhu G, Yoon TY, Park CY, Park H. Simultaneous Real-Time Three-Dimensional Localization and FRET Measurement of Two Distinct Particles. NANO LETTERS 2021; 21:7479-7485. [PMID: 34491760 DOI: 10.1021/acs.nanolett.1c01328] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Many biological processes employ mechanisms involving the locations and interactions of multiple components. Given that most biological processes occur in three dimensions, the simultaneous measurement of three-dimensional locations and interactions is necessary. However, the simultaneous three-dimensional precise localization and measurement of interactions in real time remains challenging. Here, we report a new microscopy technique to localize two spectrally distinct particles in three dimensions with an accuracy (2.35σ) of tens of nanometers with an exposure time of 100 ms and to measure their real-time interactions using fluorescence resonance energy transfer (FRET) simultaneously. Using this microscope, we tracked two distinct vesicles containing t-SNAREs or v-SNARE in three dimensions and observed FRET simultaneously during single-vesicle fusion in real time, revealing the nanoscale motion and interactions of single vesicles in vesicle fusion. Thus, this study demonstrates that our microscope can provide detailed information about real-time three-dimensional nanoscale locations, motion, and interactions in biological processes.
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Affiliation(s)
- Xingxiang Chen
- Division of Life Science, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong
| | - Teng Liu
- Department of Physics, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong
| | - Xianan Qin
- Department of Physics, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong
| | - Quang Quan Nguyen
- Department of Physics, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong
| | - Sang Kwon Lee
- Department of Biological Sciences, School of Life Sciences, UNIST, 44919, Ulsan, Republic of Korea
| | - Chanwoo Lee
- School of Biological Sciences and Institute of Molecular Biology and Genetics, Seoul National University, Seoul 08826, South Korea
| | - Yaguang Ren
- Department of Chemical and Biological Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong
| | - Jun Chu
- Research Lab for Biomedical Optics and Molecular Imaging, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, 518055, China
| | - Guang Zhu
- Division of Life Science, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong
- Department of Chemical and Biological Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong
| | - Tae-Young Yoon
- School of Biological Sciences and Institute of Molecular Biology and Genetics, Seoul National University, Seoul 08826, South Korea
| | - Chan Young Park
- Department of Biological Sciences, School of Life Sciences, UNIST, 44919, Ulsan, Republic of Korea
| | - Hyokeun Park
- Division of Life Science, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong
- Department of Physics, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong
- State Key Laboratory of Molecular Neuroscience The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong
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