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Aktalay A, Khan TA, Bossi ML, Belov VN, Hell SW. Photoactivatable Carbo- and Silicon-Rhodamines and Their Application in MINFLUX Nanoscopy. Angew Chem Int Ed Engl 2023; 62:e202302781. [PMID: 37555720 DOI: 10.1002/anie.202302781] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2023] [Revised: 08/05/2023] [Accepted: 08/08/2023] [Indexed: 08/10/2023]
Abstract
New photoactivatable fluorescent dyes (rhodamine, carbo- and silicon-rhodamines [SiR]) with emission ranging from green to far red have been prepared, and their photophysical properties studied. The photocleavable 2-nitrobenzyloxycarbonyl unit with an alpha-carboxyl group as a branching point and additional functionality was attached to a polycyclic and lipophilic fluorescent dye. The photoactivatable probes having the HaloTagTM amine (O2) ligand bound with a dye core were obtained and applied for live-cell staining in stable cell lines incorporating Vimentin (VIM) or Nuclear Pore Complex Protein NUP96 fused with the HaloTag. The probes were applied in 2D (VIM, NUP96) and 3D (VIM) MINFLUX nanoscopy, as well as in superresolution fluorescence microscopy with single fluorophore activation (VIM, live-cell labeling). Images of VIM and NUPs labeled with different dyes were acquired and their apparent dimensions and shapes assessed on a lower single-digit nanometer scale. Applicability and performance of the photoactivatable dye derivatives were evaluated in terms of photoactivation rate, labeling and detection efficiency, number of detected photons per molecule and other parameters related to MINFLUX nanoscopy.
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Affiliation(s)
- Ayse Aktalay
- Department of Optical Nanoscopy, Max Planck Institute for Medical Research (MPI-MR), Jahnstraße 29, 69120, Heidelberg, Germany
| | - Taukeer A Khan
- Department of NanoBiophotonics, Max Planck Institute for Multidisciplinary Sciences (MPI-NAT), Am Fassberg 11, 37077, Göttingen, Germany
| | - Mariano L Bossi
- Department of Optical Nanoscopy, Max Planck Institute for Medical Research (MPI-MR), Jahnstraße 29, 69120, Heidelberg, Germany
| | - Vladimir N Belov
- Department of NanoBiophotonics, Max Planck Institute for Multidisciplinary Sciences (MPI-NAT), Am Fassberg 11, 37077, Göttingen, Germany
| | - Stefan W Hell
- Department of Optical Nanoscopy, Max Planck Institute for Medical Research (MPI-MR), Jahnstraße 29, 69120, Heidelberg, Germany
- Department of NanoBiophotonics, Max Planck Institute for Multidisciplinary Sciences (MPI-NAT), Am Fassberg 11, 37077, Göttingen, Germany
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2
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Yu W, Rush C, Tingey M, Junod S, Yang W. Application of Super-resolution SPEED Microscopy in the Study of Cellular Dynamics. CHEMICAL & BIOMEDICAL IMAGING 2023; 1:356-371. [PMID: 37501792 PMCID: PMC10369678 DOI: 10.1021/cbmi.3c00036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/23/2023] [Revised: 05/11/2023] [Accepted: 06/08/2023] [Indexed: 07/29/2023]
Abstract
Super-resolution imaging techniques have broken the diffraction-limited resolution of light microscopy. However, acquiring three-dimensional (3D) super-resolution information about structures and dynamic processes in live cells at high speed remains challenging. Recently, the development of high-speed single-point edge-excitation subdiffraction (SPEED) microscopy, along with its 2D-to-3D transformation algorithm, provides a practical and effective approach to achieving 3D subdiffraction-limit information in subcellular structures and organelles with rotational symmetry. One of the major benefits of SPEED microscopy is that it does not rely on complex optical components and can be implemented on a standard, inverted epifluorescence microscope, simplifying the process of sample preparation and the expertise requirement. SPEED microscopy is specifically designed to obtain 2D spatial locations of individual immobile or moving fluorescent molecules inside submicrometer biological channels or cavities at high spatiotemporal resolution. The collected data are then subjected to postlocalization 2D-to-3D transformation to obtain 3D super-resolution structural and dynamic information. In recent years, SPEED microscopy has provided significant insights into nucleocytoplasmic transport across the nuclear pore complex (NPC) and cytoplasm-cilium trafficking through the ciliary transition zone. This Review focuses on the applications of SPEED microscopy in studying the structure and function of nuclear pores.
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Affiliation(s)
- Wenlan Yu
- Department of Biology, Temple University, Philadelphia, Pennsylvania 19122, United States
| | - Coby Rush
- Department of Biology, Temple University, Philadelphia, Pennsylvania 19122, United States
| | - Mark Tingey
- Department of Biology, Temple University, Philadelphia, Pennsylvania 19122, United States
| | - Samuel Junod
- Department of Biology, Temple University, Philadelphia, Pennsylvania 19122, United States
| | - Weidong Yang
- Department of Biology, Temple University, Philadelphia, Pennsylvania 19122, United States
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Gayathri R, Suchand Sandeep CS, Gummaluri VS, Asik RM, Padmanabhan P, Gulyás B, Vijayan C, Murukeshan VM. Plasmonic random laser enabled artefact-free wide-field fluorescence bioimaging: uncovering finer cellular features. NANOSCALE ADVANCES 2022; 4:2278-2287. [PMID: 36133703 PMCID: PMC9417316 DOI: 10.1039/d1na00866h] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/15/2021] [Accepted: 03/31/2022] [Indexed: 06/16/2023]
Abstract
Narrow bandwidth, high brightness, and spectral tunability are the unique properties of lasers that make them extremely desirable for fluorescence imaging applications. However, due to the high spatial coherence, conventional lasers are often incompatible for wide-field fluorescence imaging. The presence of parasitic artefacts under coherent illumination causes uneven excitation of fluorophores, which has a critical impact on the reliability, resolution, and efficiency of fluorescence imaging. Here, we demonstrate artefact-free wide-field fluorescence imaging with a bright and low threshold silver nanorod based plasmonic random laser, offering the capability to image finer cellular features with sub-micrometer resolution even in highly diffusive biological samples. A spatial resolution of 454 nm and up to 23% enhancement in the image contrast in comparison to conventional laser illumination are attained. Based on the results presented in this paper, random lasers, with their laser-like properties and spatial incoherence are envisioned to be the next-generation sources for developing highly efficient wide-field fluorescence imaging systems having high spatial and temporal resolution for real-time, in vivo bioimaging.
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Affiliation(s)
- R Gayathri
- Centre for Optical and Laser Engineering (COLE), School of Mechanical and Aerospace Engineering, Nanyang Technological University 50 Nanyang Avenue 639798 Singapore
- Department of Physics, Indian Institute of Technology Madras Chennai 600036 India
| | - C S Suchand Sandeep
- Centre for Optical and Laser Engineering (COLE), School of Mechanical and Aerospace Engineering, Nanyang Technological University 50 Nanyang Avenue 639798 Singapore
| | - V S Gummaluri
- Centre for Optical and Laser Engineering (COLE), School of Mechanical and Aerospace Engineering, Nanyang Technological University 50 Nanyang Avenue 639798 Singapore
| | - R Mohamed Asik
- Cognitive Neuroimaging Centre (CONIC), Nanyang Technological University 59 Nanyang Drive 636921 Singapore
- Department of Animal Science, Bharathidasan University Tiruchirappalli 620024 India
| | - Parasuraman Padmanabhan
- Cognitive Neuroimaging Centre (CONIC), Nanyang Technological University 59 Nanyang Drive 636921 Singapore
- Lee Kong Chian School of Medicine, Nanyang Technological University 608232 Singapore
| | - Balázs Gulyás
- Cognitive Neuroimaging Centre (CONIC), Nanyang Technological University 59 Nanyang Drive 636921 Singapore
- Lee Kong Chian School of Medicine, Nanyang Technological University 608232 Singapore
- Department of Clinical Neuroscience, Karolinska Institute 17176 Stockholm Sweden
| | - C Vijayan
- Department of Physics, Indian Institute of Technology Madras Chennai 600036 India
| | - V M Murukeshan
- Centre for Optical and Laser Engineering (COLE), School of Mechanical and Aerospace Engineering, Nanyang Technological University 50 Nanyang Avenue 639798 Singapore
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Dimitriev OP. Dynamics of Excitons in Conjugated Molecules and Organic Semiconductor Systems. Chem Rev 2022; 122:8487-8593. [PMID: 35298145 DOI: 10.1021/acs.chemrev.1c00648] [Citation(s) in RCA: 29] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
The exciton, an excited electron-hole pair bound by Coulomb attraction, plays a key role in photophysics of organic molecules and drives practically important phenomena such as photoinduced mechanical motions of a molecule, photochemical conversions, energy transfer, generation of free charge carriers, etc. Its behavior in extended π-conjugated molecules and disordered organic films is very different and very rich compared with exciton behavior in inorganic semiconductor crystals. Due to the high degree of variability of organic systems themselves, the exciton not only exerts changes on molecules that carry it but undergoes its own changes during all phases of its lifetime, that is, birth, conversion and transport, and decay. The goal of this review is to give a systematic and comprehensive view on exciton behavior in π-conjugated molecules and molecular assemblies at all phases of exciton evolution with emphasis on rates typical for this dynamic picture and various consequences of the above dynamics. To uncover the rich variety of exciton behavior, details of exciton formation, exciton transport, exciton energy conversion, direct and reverse intersystem crossing, and radiative and nonradiative decay are considered in different systems, where these processes lead to or are influenced by static and dynamic disorder, charge distribution symmetry breaking, photoinduced reactions, electron and proton transfer, structural rearrangements, exciton coupling with vibrations and intermediate particles, and exciton dissociation and annihilation as well.
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Affiliation(s)
- Oleg P Dimitriev
- V. Lashkaryov Institute of Semiconductor Physics NAS of Ukraine, pr. Nauki 41, Kyiv 03028, Ukraine
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Kariyottu Kuniyil MJ, Padmanaban R. Anti‐Stokes Fluorescence and Nonlinear Optical Properties of the Functionalized Phenoxazine‐based Dye: A computational study. ChemistrySelect 2021. [DOI: 10.1002/slct.202103286] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Muhammed Jeneesh Kariyottu Kuniyil
- Department of Chemistry School of Physical Chemical and Applied Sciences Pondicherry University, R. V. Nagar Kalapet, Puducherry 605 014 India
| | - Ramanathan Padmanaban
- Department of Chemistry School of Physical Chemical and Applied Sciences Pondicherry University, R. V. Nagar Kalapet, Puducherry 605 014 India
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Albani JR. Fluorescence Characterization of Standard, Mutant and Sweet Corn. J Fluoresc 2020; 30:1261-1270. [PMID: 32767190 DOI: 10.1007/s10895-020-02601-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2020] [Accepted: 07/30/2020] [Indexed: 12/01/2022]
Abstract
This work resulted in the development of a method based on fluorescence spectroscopy to differentiate between three corn varieties, standard, mutant and sweet, and to characterize the corn variety present in finished products. This was achieved by recording fluorescence emission spectra as a function of excitation wavelength. For a standard, non-transgenic and non-sweet corn, the maximum of the first peak is around 412-414 nm at the excitation wavelength equal to 280 nm and shifts to the longer emission wavelengths as the excitation wavelength increases. Also, the second peak is located at 535 nm or is slightly higher (537 to 540 nm) and does not vary for excitation wavelengths from 280 to 360 nm. For mutant corn, the position of the first peak is located at 420 nm and above for λex = 280 nm, while the second peak starts at 525-530 nm (depending on the mutant) and never reaches 535 nm. Finally, for a sweet corn, the position of the first fluorescence emission peak is around 430 nm. If the sweet corn is non-hybrid, the position of the second emission peak is at 535 nm. A hybrid sweet corn has its second peak around 530 nm. Thus, fluorescence emission at 530 is characteristic of corn that has undergone natural or artificial genetic transformation. Finally, we found simple mathematical equations to calculate the percentage of amylopectin and amylose in a given corn.
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Affiliation(s)
- Jihad René Albani
- Laboratoire de Biophysique Moléculaire, Université de Lille, Bâtiment C6, Campus Cité Scientifique, 59655, Villeneuve d'Ascq Cédex, France.
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Szikora S, Novák T, Gajdos T, Erdélyi M, Mihály J. Superresolution Microscopy of Drosophila Indirect Flight Muscle Sarcomeres. Bio Protoc 2020; 10:e3654. [PMID: 33659324 DOI: 10.21769/bioprotoc.3654] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2020] [Revised: 04/14/2020] [Accepted: 04/17/2020] [Indexed: 11/02/2022] Open
Abstract
Sarcomeres are extremely highly ordered macromolecular assemblies where proper structural organization is an absolute prerequisite to the functionality of these contractile units. Despite the wealth of information collected, the exact spatial arrangement of many of the H-zone and Z-disk proteins remained unknown. Recently, we developed a powerful nanoscopic approach to localize the sarcomeric protein components with a resolution well below the diffraction limit. The ease of sample preparation and the near crystalline structure of the Drosophila flight muscle sarcomeres make them ideally suitable for single molecule localization microscopy and structure averaging. Our approach allowed us to determine the position of dozens of H-zone and Z-disk proteins with a quasi-molecular, ~5-10 nm localization precision. The protocol described below provides an easy and reproducible method to prepare individual myofibrils for dSTORM imaging. In addition, it includes an in-depth description of a custom made and freely available software toolbox to process and quantitatively analyze the raw localization data.
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Affiliation(s)
- Szilárd Szikora
- Institute of Genetics, Biological Research Centre, Szeged, Hungary.,Department of Optics and Quantum Electronics, University of Szeged, Szeged, Hungary
| | - Tibor Novák
- Department of Optics and Quantum Electronics, University of Szeged, Szeged, Hungary
| | - Tamás Gajdos
- Department of Optics and Quantum Electronics, University of Szeged, Szeged, Hungary
| | - Miklós Erdélyi
- Department of Optics and Quantum Electronics, University of Szeged, Szeged, Hungary
| | - József Mihály
- Institute of Genetics, Biological Research Centre, Szeged, Hungary.,Department of Optics and Quantum Electronics, University of Szeged, Szeged, Hungary
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