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Antarasen J, Wellnitz B, Kramer SN, Chatterjee S, Kisley L. Cross-correlation increases sampling in diffusion-based super-resolution optical fluctuation imaging. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.04.01.587586. [PMID: 38617244 PMCID: PMC11014504 DOI: 10.1101/2024.04.01.587586] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/16/2024]
Abstract
Correlation signal processing of optical three-dimensional (x, y, t) data can produce super-resolution images. The second order cross-correlation function XC 2 has been documented to produce super-resolution imaging with static and blinking emitters but not for diffusing emitters. Here, we both analytically and numerically demonstrate cross-correlation analysis for diffusing particles. We then expand our fluorescence correlation spectroscopy super-resolution optical fluctuation imaging (fcsSOFI) analysis to use cross-correlation as a post-processing computational technique to extract both dynamic and structural information of particle diffusion in nanoscale structures simultaneously. We further show how this method increases sampling rates and reduces aliasing for spatial information in both simulated and experimental data. Our work demonstrates how fcsSOFI with cross-correlation can be a powerful signal-processing tool to resolve the nanoscale dynamics and structure in samples relevant to biological and soft materials. TOC Graphic
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2
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Pramanik SK, Sreedharan S, Tiwari R, Dutta S, Kandoth N, Barman S, Aderinto SO, Chattopadhyay S, Das A, Thomas JA. Nanoparticles for super-resolution microscopy: intracellular delivery and molecular targeting. Chem Soc Rev 2022; 51:9882-9916. [PMID: 36420611 DOI: 10.1039/d1cs00605c] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Following an overview of the approaches and techniques used to acheive super-resolution microscopy, this review presents the advantages supplied by nanoparticle based probes for these applications. The various clases of nanoparticles that have been developed toward these goals are then critically described and these discussions are illustrated with a variety of examples from the recent literature.
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Affiliation(s)
- Sumit Kumar Pramanik
- CSIR - Central Salt and Marine Chemicals Research Institute, Gijubhai Badheka Marg, Bhavnagar, Gujarat 364002, India.
| | - Sreejesh Sreedharan
- Human Science Research Centre, University of Derby, Kedleston road, DE22 1GB, UK
| | - Rajeshwari Tiwari
- CSIR - Central Salt and Marine Chemicals Research Institute, Gijubhai Badheka Marg, Bhavnagar, Gujarat 364002, India.
| | - Sourav Dutta
- Department of Chemical Sciences and Centre for Advanced Functional Materials, Indian Institute of Science Education and Research, Kolkata, West Bengal, India.
| | - Noufal Kandoth
- Department of Chemical Sciences and Centre for Advanced Functional Materials, Indian Institute of Science Education and Research, Kolkata, West Bengal, India.
| | - Surajit Barman
- Department of Chemical Sciences and Centre for Advanced Functional Materials, Indian Institute of Science Education and Research, Kolkata, West Bengal, India.
| | - Stephen O Aderinto
- Department of Chemistry, University of Sheffield, Western Bank, Sheffield, S3 7HF, UK.
| | - Samit Chattopadhyay
- Department of Biological Sciences, BITS-Pilani, K K Birla Goa Campus, NH 17B, Zuarinagar, Goa 403726, India.
| | - Amitava Das
- Department of Chemical Sciences and Centre for Advanced Functional Materials, Indian Institute of Science Education and Research, Kolkata, West Bengal, India.
| | - Jim A Thomas
- Department of Chemistry, University of Sheffield, Western Bank, Sheffield, S3 7HF, UK.
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3
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Cevoli D, Vitale R, Vandenberg W, Hugelier S, Van den Eynde R, Dedecker P, Ruckebusch C. Design of experiments for the optimization of SOFI super-resolution microscopy imaging. BIOMEDICAL OPTICS EXPRESS 2021; 12:2617-2630. [PMID: 34123492 PMCID: PMC8176802 DOI: 10.1364/boe.421168] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2021] [Revised: 03/15/2021] [Accepted: 03/29/2021] [Indexed: 05/04/2023]
Abstract
Super-resolution optical fluctuation imaging (SOFI) is a well-known super-resolution technique appreciated for its versatility and broad applicability. However, even though an extended theoretical description is available, it is still not fully understood how the interplay between different experimental parameters influences the quality of a SOFI image. We investigated the relationship between five experimental parameters (measurement time, on-time t on, off-time t off, probe brightness, and out of focus background) and the quality of the super-resolved images they yielded, expressed as Signal to Noise Ratio (SNR). Empirical relationships were modeled for second- and third-order SOFI using data simulated according to a D-Optimal design of experiments, which is an ad-hoc design built to reduce the experimental load when the total number of trials to be conducted becomes too high for practical applications. This approach proves to be more reliable and efficient for parameter optimization compared to the more classical parameter by parameter approach. Our results indicate that the best image quality is achieved for the fastest emitter blinking (lowest t on and t off), lowest background level, and the highest measurement duration, while the brightness variation does not affect the quality in a statistically significant way within the investigated range. However, when the ranges spanned by the parameters are constrained, a different set of optimal conditions may arise. For example, for second-order SOFI, we identified situations in which the increase of t off can be beneficial to SNR, such as when the measurement duration is long enough. In general, optimal values of t on and t off have been found to be highly dependent from each other and from the measurement duration.
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Affiliation(s)
- Dario Cevoli
- Univ. Lille, CNRS, LASIRE, Laboratory of advanced spectroscopy, interactions, reactivity and environment, F- 59000 Lille, France
- KU Leuven, Laboratory for NanoBiology, Department of Chemistry, Celestijnenlaan 200G, 3001 Heverlee, Belgium
| | - Raffaele Vitale
- Univ. Lille, CNRS, LASIRE, Laboratory of advanced spectroscopy, interactions, reactivity and environment, F- 59000 Lille, France
| | - Wim Vandenberg
- Univ. Lille, CNRS, LASIRE, Laboratory of advanced spectroscopy, interactions, reactivity and environment, F- 59000 Lille, France
- KU Leuven, Laboratory for NanoBiology, Department of Chemistry, Celestijnenlaan 200G, 3001 Heverlee, Belgium
| | - Siewert Hugelier
- KU Leuven, Laboratory for NanoBiology, Department of Chemistry, Celestijnenlaan 200G, 3001 Heverlee, Belgium
| | - Robin Van den Eynde
- KU Leuven, Laboratory for NanoBiology, Department of Chemistry, Celestijnenlaan 200G, 3001 Heverlee, Belgium
| | - Peter Dedecker
- KU Leuven, Laboratory for NanoBiology, Department of Chemistry, Celestijnenlaan 200G, 3001 Heverlee, Belgium
| | - Cyril Ruckebusch
- Univ. Lille, CNRS, LASIRE, Laboratory of advanced spectroscopy, interactions, reactivity and environment, F- 59000 Lille, France
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Hugelier S, Vandenberg W, Lukeš T, Grußmayer KS, Eilers PHC, Dedecker P, Ruckebusch C. Smoothness correction for better SOFI imaging. Sci Rep 2021; 11:7569. [PMID: 33828326 PMCID: PMC8027426 DOI: 10.1038/s41598-021-87164-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2020] [Accepted: 03/23/2021] [Indexed: 12/02/2022] Open
Abstract
Sub-diffraction or super-resolution fluorescence imaging allows the visualization of the cellular morphology and interactions at the nanoscale. Statistical analysis methods such as super-resolution optical fluctuation imaging (SOFI) obtain an improved spatial resolution by analyzing fluorophore blinking but can be perturbed by the presence of non-stationary processes such as photodestruction or fluctuations in the illumination. In this work, we propose to use Whittaker smoothing to remove these smooth signal trends and retain only the information associated to independent blinking of the emitters, thus enhancing the SOFI signals. We find that our method works well to correct photodestruction, especially when it occurs quickly. The resulting images show a much higher contrast, strongly suppressed background and a more detailed visualization of cellular structures. Our method is parameter-free and computationally efficient, and can be readily applied on both two-dimensional and three-dimensional data.
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Affiliation(s)
| | - Wim Vandenberg
- Laboratory for Nanobiology, KU Leuven, 3001, Leuven, Belgium
| | - Tomáš Lukeš
- Laboratory of Nanoscale Biology, École Polytechnique Fédérale de Lausanne, 1015, Lausanne, Switzerland
| | - Kristin S Grußmayer
- Laboratory of Nanoscale Biology, École Polytechnique Fédérale de Lausanne, 1015, Lausanne, Switzerland.,Grußmayer Lab, Delft University of Technology, 2629 HZ, Delft, the Netherlands
| | - Paul H C Eilers
- Erasmus University Medical Centre, 3015, Rotterdam, the Netherlands
| | - Peter Dedecker
- Laboratory for Nanobiology, KU Leuven, 3001, Leuven, Belgium
| | - Cyril Ruckebusch
- University of Lille, CNRS, UMR 8516, LASIRE, 59000, Lille, France
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5
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Grußmayer KS, Geissbuehler S, Descloux A, Lukes T, Leutenegger M, Radenovic A, Lasser T. Spectral cross-cumulants for multicolor super-resolved SOFI imaging. Nat Commun 2020; 11:3023. [PMID: 32541869 PMCID: PMC7295763 DOI: 10.1038/s41467-020-16841-1] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2019] [Accepted: 05/27/2020] [Indexed: 11/09/2022] Open
Abstract
Super-resolution optical fluctuation imaging provides a resolution beyond the diffraction limit by analysing stochastic fluorescence fluctuations with higher-order statistics. Using nth order spatio-temporal cross-cumulants the spatial resolution and the sampling can be increased up to n-fold in all spatial dimensions. In this study, we extend the cumulant analysis into the spectral domain and propose a multicolor super-resolution scheme. The simultaneous acquisition of two spectral channels followed by spectral cross-cumulant analysis and unmixing increases the spectral sampling. The number of discriminable fluorophore species is thus not limited to the number of physical detection channels. Using two color channels, we demonstrate spectral unmixing of three fluorophore species in simulations and experiments in fixed and live cells. Based on an eigenvalue/vector analysis, we propose a scheme for an optimized spectral filter choice. Overall, our methodology provides a route for easy-to-implement multicolor sub-diffraction imaging using standard microscopes while conserving the spatial super-resolution property.
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Affiliation(s)
- K S Grußmayer
- Laboratory of Nanoscale Biology, École Polytechnique Fédérale de Lausanne, 1015, Lausanne, Switzerland.
- Laboratoire d'Optique Biomédicale, École Polytechnique Fédérale de Lausanne, 1015, Lausanne, Switzerland.
| | - S Geissbuehler
- Laboratoire d'Optique Biomédicale, École Polytechnique Fédérale de Lausanne, 1015, Lausanne, Switzerland
| | - A Descloux
- Laboratory of Nanoscale Biology, École Polytechnique Fédérale de Lausanne, 1015, Lausanne, Switzerland
- Laboratoire d'Optique Biomédicale, École Polytechnique Fédérale de Lausanne, 1015, Lausanne, Switzerland
| | - T Lukes
- Laboratory of Nanoscale Biology, École Polytechnique Fédérale de Lausanne, 1015, Lausanne, Switzerland
- Laboratoire d'Optique Biomédicale, École Polytechnique Fédérale de Lausanne, 1015, Lausanne, Switzerland
| | - M Leutenegger
- Laboratoire d'Optique Biomédicale, École Polytechnique Fédérale de Lausanne, 1015, Lausanne, Switzerland
- Department of NanoBiophotonics, Max-Planck Institute for Biophysical Chemistry, Am Fassberg 11, 37077, Göttingen, Germany
| | - A Radenovic
- Laboratory of Nanoscale Biology, École Polytechnique Fédérale de Lausanne, 1015, Lausanne, Switzerland
| | - T Lasser
- Laboratoire d'Optique Biomédicale, École Polytechnique Fédérale de Lausanne, 1015, Lausanne, Switzerland.
- Max-Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany.
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6
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Vandenberg W, Leutenegger M, Duwé S, Dedecker P. An extended quantitative model for super-resolution optical fluctuation imaging (SOFI). OPTICS EXPRESS 2019; 27:25749-25766. [PMID: 31510441 DOI: 10.1364/oe.27.025749] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/06/2019] [Accepted: 05/20/2019] [Indexed: 05/21/2023]
Abstract
Super-resolution optical fluctuation imaging (SOFI) provides super-resolution (SR) fluorescence imaging by analyzing fluctuations in the fluorophore emission. The technique has been used both to acquire quantitative SR images and to provide SR biosensing by monitoring changes in fluorophore blinking dynamics. Proper analysis of such data relies on a fully quantitative model of the imaging. However, previous SOFI imaging models made several assumptions that can not be realized in practice. In this work we address these limitations by developing and verifying a fully quantitative model that better approximates real-world imaging conditions. Our model shows that (i) SOFI images are free of bias, or can be made so, if the signal is stationary and fluorophores blink independently, (ii) allows a fully quantitative description of the link between SOFI imaging and probe dynamics, and (iii) paves the way for more advanced SOFI image reconstruction by offering a computationally fast way to calculate SOFI images for arbitrary probe, sample and instrumental properties.
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7
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Mishin AS, Lukyanov KA. Live-Cell Super-resolution Fluorescence Microscopy. BIOCHEMISTRY (MOSCOW) 2019; 84:S19-S31. [PMID: 31213193 DOI: 10.1134/s0006297919140025] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Super-resolution fluorescence microscopy (nanoscopy) enables imaging with a spatial resolution much higher than the diffraction limit of optical microscopy. However, the methods of fluorescence nanoscopy are still poorly suitable for studying living cells. In this review, we describe some of methods for nanoscopy and specific fluorescent labeling aimed to decrease the damaging effects of light illumination on live samples.
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Affiliation(s)
- A S Mishin
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, 117997, Russia.
| | - K A Lukyanov
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, 117997, Russia
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8
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Wang S, Chen X, Chang L, Ding M, Xue R, Duan H, Sun Y. GMars-T Enabling Multimodal Subdiffraction Structural and Functional Fluorescence Imaging in Live Cells. Anal Chem 2018; 90:6626-6634. [PMID: 29722976 DOI: 10.1021/acs.analchem.8b00418] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Fluorescent probes with multimodal and multilevel imaging capabilities are highly valuable as imaging with such probes not only can obtain new layers of information but also enable cross-validation of results under different experimental conditions. In recent years, the development of genetically encoded reversibly photoswitchable fluorescent proteins (RSFPs) has greatly promoted the application of various kinds of live-cell nanoscopy approaches, including reversible saturable optical fluorescence transitions (RESOLFT) and stochastic optical fluctuation imaging (SOFI). However, these two classes of live-cell nanoscopy approaches require different optical characteristics of specific RSFPs. In this work, we developed GMars-T, a monomeric bright green RSFP which can satisfy both RESOLFT and photochromic SOFI (pcSOFI) imaging in live cells. We further generated biosensor based on bimolecular fluorescence complementation (BiFC) of GMars-T which offers high specificity and sensitivity in detecting and visualizing various protein-protein interactions (PPIs) in different subcellular compartments under physiological conditions (e.g., 37 °C) in live mammalian cells. Thus, the newly developed GMars-T can serve as both structural imaging probe with multimodal super-resolution imaging capability and functional imaging probe for reporting PPIs with high specificity and sensitivity based on its derived biosensor.
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Affiliation(s)
- Sheng Wang
- State Key Laboratory of Membrane Biology, Biodynamic Optical Imaging Center (BIOPIC), School of Life Sciences , Peking University , Beijing 100871 , China
| | - Xuanze Chen
- State Key Laboratory of Membrane Biology, Biodynamic Optical Imaging Center (BIOPIC), School of Life Sciences , Peking University , Beijing 100871 , China.,Department of Biomedical Engineering, College of Engineering , Peking University , Beijing 100871 , China.,Cowin Venture Shanghai 200040 , China
| | - Lei Chang
- State Key Laboratory of Membrane Biology, Biodynamic Optical Imaging Center (BIOPIC), School of Life Sciences , Peking University , Beijing 100871 , China
| | - Miao Ding
- State Key Laboratory of Membrane Biology, Biodynamic Optical Imaging Center (BIOPIC), School of Life Sciences , Peking University , Beijing 100871 , China
| | - Ruiying Xue
- State Key Laboratory of Membrane Biology, Biodynamic Optical Imaging Center (BIOPIC), School of Life Sciences , Peking University , Beijing 100871 , China
| | - Haifeng Duan
- State Key Laboratory of Membrane Biology, Biodynamic Optical Imaging Center (BIOPIC), School of Life Sciences , Peking University , Beijing 100871 , China
| | - Yujie Sun
- State Key Laboratory of Membrane Biology, Biodynamic Optical Imaging Center (BIOPIC), School of Life Sciences , Peking University , Beijing 100871 , China
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9
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Vangindertael J, Camacho R, Sempels W, Mizuno H, Dedecker P, Janssen KPF. An introduction to optical super-resolution microscopy for the adventurous biologist. Methods Appl Fluoresc 2018; 6:022003. [DOI: 10.1088/2050-6120/aaae0c] [Citation(s) in RCA: 124] [Impact Index Per Article: 20.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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10
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Limsakul P, Peng Q, Wu Y, Allen ME, Liang J, Remacle AG, Lopez T, Ge X, Kay BK, Zhao H, Strongin AY, Yang XL, Lu S, Wang Y. Directed Evolution to Engineer Monobody for FRET Biosensor Assembly and Imaging at Live-Cell Surface. Cell Chem Biol 2018; 25:370-379.e4. [PMID: 29396288 DOI: 10.1016/j.chembiol.2018.01.002] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2016] [Revised: 06/01/2017] [Accepted: 12/29/2017] [Indexed: 12/14/2022]
Abstract
Monitoring enzymatic activities at the cell surface is challenging due to the poor efficiency of transport and membrane integration of fluorescence resonance energy transfer (FRET)-based biosensors. Therefore, we developed a hybrid biosensor with separate donor and acceptor that assemble in situ. The directed evolution and sequence-function analysis technologies were integrated to engineer a monobody variant (PEbody) that binds to R-phycoerythrin (R-PE) dye. PEbody was used for visualizing the dynamic formation/separation of intercellular junctions. We further fused PEbody with the enhanced CFP and an enzyme-specific peptide at the extracellular surface to create a hybrid FRET biosensor upon R-PE capture for monitoring membrane-type-1 matrix metalloproteinase (MT1-MMP) activities. This biosensor revealed asymmetric distribution of MT1-MMP activities, which were high and low at loose and stable cell-cell contacts, respectively. Therefore, directed evolution and rational design are promising tools to engineer molecular binders and hybrid FRET biosensors for monitoring molecular regulations at the surface of living cells.
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Affiliation(s)
- Praopim Limsakul
- Department of Bioengineering, Institute of Engineering in Medicine, University of California, San Diego, La Jolla, CA 92093, USA
| | - Qin Peng
- Department of Bioengineering, Institute of Engineering in Medicine, University of California, San Diego, La Jolla, CA 92093, USA
| | - Yiqian Wu
- Department of Bioengineering, Institute of Engineering in Medicine, University of California, San Diego, La Jolla, CA 92093, USA
| | - Molly E Allen
- Department of Bioengineering, Institute of Engineering in Medicine, University of California, San Diego, La Jolla, CA 92093, USA
| | - Jing Liang
- Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - Albert G Remacle
- Sanford-Burnham-Prebys Medical Discovery Institute, La Jolla, CA 92037, USA
| | - Tyler Lopez
- Department of Chemical and Environmental Engineering, University of California, Riverside, Riverside, CA, USA
| | - Xin Ge
- Department of Chemical and Environmental Engineering, University of California, Riverside, Riverside, CA, USA
| | - Brian K Kay
- Department of Biological Sciences, University of Illinois Chicago, Chicago, IL 60607, USA
| | - Huimin Zhao
- Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - Alex Y Strongin
- Sanford-Burnham-Prebys Medical Discovery Institute, La Jolla, CA 92037, USA
| | - Xiang-Lei Yang
- Departments of Chemical Physiology and Cell and Molecular Biology, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Shaoying Lu
- Department of Bioengineering, Institute of Engineering in Medicine, University of California, San Diego, La Jolla, CA 92093, USA.
| | - Yingxiao Wang
- Department of Bioengineering, Institute of Engineering in Medicine, University of California, San Diego, La Jolla, CA 92093, USA.
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11
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Hertel F, Mo GCH, Dedecker P, Zhang J. Observing the Assembly of Protein Complexes in Living Eukaryotic Cells in Super-Resolution Using refSOFI. Methods Mol Biol 2018; 1764:267-277. [PMID: 29605920 PMCID: PMC8580746 DOI: 10.1007/978-1-4939-7759-8_16] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Few approaches are currently available that allow the detection of protein-protein interactions (PPIs) in super-resolution, and the observation of the assembly of protein complexes in living cells has been particularly challenging. We developed reconstituted fluorescence-based stochastic optical fluctuation imaging (refSOFI), which is based on bimolecular fluorescence complementation (BiFC) and SOFI, allowing us to detect protein complex assembly 30 min after the induction of complex formation. Here we describe how to use refSOFI to map the assembly of two proteins of interest into a complex within living cells at super-resolution.
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Affiliation(s)
- Fabian Hertel
- Department of Chemistry, University of Leuven, Heverlee, Belgium
| | - Gary C H Mo
- Department of Pharmacology, University of California at San Diego, La Jolla, CA, USA
| | - Peter Dedecker
- Department of Chemistry, University of Leuven, Heverlee, Belgium
| | - Jin Zhang
- Department of Pharmacology, University of California at San Diego, La Jolla, CA, USA.
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12
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Correcting for photodestruction in super-resolution optical fluctuation imaging. Sci Rep 2017; 7:10470. [PMID: 28874717 PMCID: PMC5585228 DOI: 10.1038/s41598-017-09666-4] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2017] [Accepted: 07/24/2017] [Indexed: 12/03/2022] Open
Abstract
Super-resolution optical fluctuation imaging overcomes the diffraction limit by analyzing fluctuations in the fluorophore emission. A key assumption of the imaging is that the fluorophores are independent, though this is invalidated in the presence of photodestruction. In this work, we evaluate the effect of photodestruction on SOFI imaging using theoretical considerations and computer simulations. We find that photodestruction gives rise to an additional signal that does not present an easily interpretable view of the sample structure. This additional signal is strong and the resulting images typically exhibit less noise. Accordingly, these images may be mis-interpreted as being more visually pleasing or more informative. To address this uncertainty, we develop a procedure that can robustly estimate to what extent any particular experiment is affected by photodestruction. We also develop a detailed assessment methodology and use it to evaluate the performance of several correction algorithms. We identify two approaches that can correct for the presence of even strong photodestruction, one of which can be implemented directly in the SOFI calculation software.
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13
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Duwé S, Vandenberg W, Dedecker P. Live-cell monochromatic dual-label sub-diffraction microscopy by mt-pcSOFI. Chem Commun (Camb) 2017; 53:7242-7245. [DOI: 10.1039/c7cc02344h] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We present mt-pcSOFI, live-cell monochromatic sub-diffraction imaging and illustrate the method with existing RSFPs and the newly developed ffDronpa-F.
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Affiliation(s)
- S. Duwé
- Laboratory for NanoBiology
- Department of Chemistry
- KU Leuven
- 3001 Leuven
- Belgium
| | - W. Vandenberg
- Laboratory for NanoBiology
- Department of Chemistry
- KU Leuven
- 3001 Leuven
- Belgium
| | - P. Dedecker
- Laboratory for NanoBiology
- Department of Chemistry
- KU Leuven
- 3001 Leuven
- Belgium
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