Fluorophore Selection Guide for Flow Cytometry Dye Choices for Your Instrument Made Easy
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The Green Fluorescent Protein
P1: rpk/plb P2: rpk April 30, 1998 11:6 Annual Reviews AR057-17 Annu. Rev. Biochem. 1998. 67:509–44 Copyright c 1998 by Annual Reviews. All rights reserved THE GREEN FLUORESCENT PROTEIN Roger Y. Tsien Howard Hughes Medical Institute; University of California, San Diego; La Jolla, CA 92093-0647 KEY WORDS: Aequorea, mutants, chromophore, bioluminescence, GFP ABSTRACT In just three years, the green fluorescent protein (GFP) from the jellyfish Aequorea victoria has vaulted from obscurity to become one of the most widely studied and exploited proteins in biochemistry and cell biology. Its amazing ability to generate a highly visible, efficiently emitting internal fluorophore is both intrin- sically fascinating and tremendously valuable. High-resolution crystal structures of GFP offer unprecedented opportunities to understand and manipulate the rela- tion between protein structure and spectroscopic function. GFP has become well established as a marker of gene expression and protein targeting in intact cells and organisms. Mutagenesis and engineering of GFP into chimeric proteins are opening new vistas in physiological indicators, biosensors, and photochemical memories. CONTENTS NATURAL AND SCIENTIFIC HISTORY OF GFP .................................510 Discovery and Major Milestones .............................................510 Occurrence, Relation to Bioluminescence, and Comparison with Other Fluorescent Proteins .....................................511 PRIMARY, SECONDARY, TERTIARY, AND QUATERNARY STRUCTURE ...........512 Primary Sequence from -
Microenvironment-Triggered Dual-Activation of a Photosensitizer
www.nature.com/scientificreports OPEN Microenvironment‑triggered dual‑activation of a photosensitizer‑ fuorophore conjugate for tumor specifc imaging and photodynamic therapy Chang Wang1, Shengdan Wang1, Yuan Wang1, Honghai Wu1, Kun Bao2, Rong Sheng1* & Xin Li1* Photodynamic therapy is attracting increasing attention, but how to increase its tumor‑specifcity remains a daunting challenge. Herein we report a theranostic probe (azo‑pDT) that integrates pyropheophorbide α as a photosensitizer and a NIR fuorophore for tumor imaging. The two functionalities are linked with a hypoxic‑sensitive azo group. Under normal conditions, both the phototoxicity of the photosensitizer and the fuorescence of the fuorophore are inhibited. While under hypoxic condition, the reductive cleavage of the azo group will restore both functions, leading to tumor specifc fuorescence imaging and phototoxicity. The results showed that azo‑PDT selectively images BEL‑7402 cells under hypoxia, and simultaneously inhibits BEL‑7402 cell proliferation after near‑infrared irradiation under hypoxia, while little efect on BEL‑7402 cell viability was observed under normoxia. These results confrm the feasibility of our design strategy to improve the tumor‑ targeting ability of photodynamic therapy, and presents azo‑pDT probe as a promising dual functional agent. Cancer is one of the most common causes of death, and more and more therapeutic strategies against this fatal disease have emerged in the past few decades. Among these strategies, photodynamic therapy has attracted much attention1. Tis therapy is based on singlet oxygen produced by photosensitizers under the irradiation with light of a specifc wavelength to damage tumor tissues (Fig. 1a). Since the photo-damaging efect is induced by the interaction between a photosensitizer and light, tumor-specifc therapy may be realized by focusing the light to the tumor site. -
Fluorescent Protein-Based Tools for Neuroscience
!1 !2 Fluorescent protein-based tools Outline for neuroscience An animatd primer on biosensor development Fluorescent proteins (FPs) Robert E. Campbell Department of Chemistry Other fluorophore technologies Single FP-based biosensors Imaging Structure & Function in the Nervous System Cold Spring Harbor, July 31, 2019. Lots of structural Lots of structural information information & Transmitted light Fluorescence microscopy of fluorescent color microscopy of live cells live cells No molecular provides molecular information information (more colors = more information) !5 !6 Fluorescence microscopy requires fluorophores Non-natural fluorophores for protein labelling Trends Bioch. Sci., 1984, 9, 88-91. O O O N O N 495 nm 519 nm 557 nm 576 nm - - CO2 CO2 S O O O N O N C N N C S ϕ = quantum yield - - ε = extinction coefficient CO2 CO2 ϕ Brightness ~ * ε S C i.e., for fluorescein N Proteins of interest ϕ = 0.92 N Fluorescein Tetramethylrhodamine ε = 73,000 M-1cm-1 C S (FITC) (TRITC) A non-natural fluorophore must be chemically linked to Non-natural fluorophores made by chemical synthesis a protein of interest… !7 !8 Getting non-natural fluorophores into a cell Some sea creatures make natural fluorophores Trends Bioch. Sci., 1984, 9, 88-91. O O O N O N Bioluminescent - Fluorescent CO2 CO -- S 2 S C N NHN C H S S Chemically labeled proteins of interest Microinjection with micropipet O O O N O N Fluorescent - CO2 CO - S 2 N NH H S …and then manually injected into a cell Some natural fluorophores are genetically encoded proteins http://www.luminescentlabs.org/and can be transplanted into cells as DNA! 228 OSAMU SHIMOMURA, FRANK H. -
Insights on the Interaction of Calcein with Calcium Carbonate and Its Implications in Biomineralization Studies
Insights on the interaction of calcein with calcium carbonate and its implications in biomineralization studies Giulia Magnabosco a,*, Iryna Polishchuk b, Jonathan Erez c, Simona Fermani a, Boaz Pokroy b, Giuseppe Falini a,* The effects of calcein, a marker commonly used to assess entrapment of calcein within the crystal structure of calcium mineral growth in calcifying organism, on calcite and aragonite carbonates is known to occur due its chemical structure.21,22 structure have been investigated. Calcein is entrapped within In this work, we examined in vitro the effect of calcein on the calcite and aragonite and modifies the shape and morphology growth of calcite and aragonite crystals, the two main 2+ of both polymorphs. Moreover, in the presence of Mg , it polymorphs of CaCO3 found in living organisms, using the inhibits aragonite formation in favor of magnesium calcite. calcein concentration in the range usually adopted for in vivo labelling. Studying and understanding of the biomineralization processes For this goal, we used the vapor diffusion method, consisting employ various methods to mark the growth of the inorganic in the diffusion of NH3(g) and CO2(g) obtained from the 2+ components of the organisms, allowing researchers to decomposition of (NH4)2CO3(s), into a Ca solution containing correlate a particular region of the skeleton to the instant of its the dye. This method is relevant for biomineralization process 2- deposition. A common method is to use fluorescent molecules due to the slow increase of the concentration of CO3 ions in to label a particular stage of the deposition process.1 Calcein, a the crystallization solution. -
Fluorophore Referenceguide
Fluorophore Reference Guide Fluorophore Excitation and Emission Data Laser Lines Broad UV Excitation Excitation Maxima Emission Maxima Emission Filters 290-365 nm LP = Long pass filter DF = Band pass filter Excel. ___ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ DAPI: 359 nm ____ SP = Short pass filter Good ___ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ GFP (Green Fluorescent Protein): 395 nm ____ 400 nm Good ___ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ Coumarin: 402 nm ____ 425 nm Good ___ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ AttoPhos: 440 nm ____ ____ 443 nm: Coumarin 450 nm Good ___ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ Acridine Orange: 460/500 nm ____ ____ 461 nm: DAPI Good __ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ R-phycoerythrin: 480/565 nm ____ Excel. -
Product Information Sheet
AAT Bioquest®, Inc. Product Technical Information Sheet Last Updated July 2012 Classic Calcium Detection Reagents Calcium acts as a universal second messenger in a variety of cells. Numerous functions of all types of cells are regulated by Ca2+ to a greater or lesser degree, thus calcium measurement is critical for numerous biological investigations. Since the 1920s, scientists have attempted to measure Ca2+, but few were successful due to limited availability of Ca2+ probes. The first reliable measurement of Ca2+ was performed by Ridgway and Ashley by injecting the photoprotein aequorin into the giant muscle fiber of the barnacle. Subsequently, in the 1980s, Tsien and colleagues produced a variety of fluorescent indicators. Among them Indo-1, Fura-2, Fluo-3 and Rhod-2 have been the most valuable dyes for measuring Ca2+ with a fluorescence instrument. Fluorescent probes that show spectral responses upon binding to Ca2+ have enabled researchers to investigate changes in intracellular free Ca2+ concentrations by using fluorescence microscopy, flow cytometry, fluorescence spectroscopy and fluorescence microplate readers. Most of these fluorescent indicators are derivatives of BAPTA chelators that incorporate a PET system responsive to calcium. FLIPR® and FlexStation™ instruments of Molecular Devices Corp., FDSS of Hamamatsu Corp. and NOVOstar™ of BMG Technologies have enabled high throughput measurement of calcium for GPCR and ion channel research. There are quite a few factors that need to be considered when selecting a fluorescent Ca2+ indicator. Spectral Properties: For UV excitation, Indo-1 and Fura-2 are widely used. Fluo-3 is preferred for 488 nm excitation while Rhod-2 and X-rhod are used for red emissions. -
Water-Soluble Pyrrolopyrrole Cyanine (Ppcy) NIR Fluorophores† Cite This: Chem
Erschienen in: Chemical Communications ; 2014, 50. - S. 4755-4758 ChemComm View Article Online COMMUNICATION View Journal | View Issue Water-soluble pyrrolopyrrole cyanine (PPCy) NIR fluorophores† Cite this: Chem. Commun., 2014, 50, 4755 Simon Wiktorowski, Christelle Rosazza, Martin J. Winterhalder, Ewald Daltrozzo Received 7th February 2014, and Andreas Zumbusch* Accepted 21st March 2014 DOI: 10.1039/c4cc01014k www.rsc.org/chemcomm Water-soluble derivatives of pyrrolopyrrole cyanines (PPCys) have been dyes, BODIPYs or others.7 Notable are also advances in other fields, synthesized by a post-synthetic modification route. In highly polar like the engineering of GFP-related fluorescing proteins or quantum media, these dyes are excellent NIR fluorophores. Labeling experiments dots, which have resulted in the synthesis of novel systems with NIR show how these novel dyes are internalized into mammalian cells. emission.8 To date, however, only a few water-soluble dyes with strong NIR absorptions and emissions have been known. Apart from the Near-infrared (NIR) light absorbing and emitting compounds have general scarcity of NIR absorbing molecules, the main reason for this attracted a lot of interest since the 1990’s.1 Initially, this was motivated is that NIR absorption is commonly observed in extended p-systems by their use in optical data storage or as laser dyes. Recently, however, which most often are hydrophobic. The incorporation of hydrophilic new applications of NIR dyes have emerged, which has led to a surge of functionalities into -
Chemical Probes to Visualize Bacterial Cell Structure and Physiology
molecules Review From Differential Stains to Next Generation Physiology: Chemical Probes to Visualize Bacterial Cell Structure and Physiology Jonathan Hira 1, Md. Jalal Uddin 1 , Marius M. Haugland 2 and Christian S. Lentz 1,* 1 Research Group for Host-Microbe Interactions, Department of Medical Biology and Centre for New Antibacterial Strategies (CANS), UiT—The Arctic University of Norway, 9019 Tromsø, Norway; [email protected] (J.H.); [email protected] (M.J.U.) 2 Department of Chemistry and Centre for New Antibacterial Strategies (CANS), UiT—The Arctic University of Norway, 9019 Tromsø, Norway; [email protected] * Correspondence: [email protected] Academic Editor: Steven Verhelst Received: 30 September 2020; Accepted: 23 October 2020; Published: 26 October 2020 Abstract: Chemical probes have been instrumental in microbiology since its birth as a discipline in the 19th century when chemical dyes were used to visualize structural features of bacterial cells for the first time. In this review article we will illustrate the evolving design of chemical probes in modern chemical biology and their diverse applications in bacterial imaging and phenotypic analysis. We will introduce and discuss a variety of different probe types including fluorogenic substrates and activity-based probes that visualize metabolic and specific enzyme activities, metabolic labeling strategies to visualize structural features of bacterial cells, antibiotic-based probes as well as fluorescent conjugates to probe biomolecular uptake pathways. Keywords: activity-based probe; antibiotic conjugate; bacterial imaging; bacterial uptake; fluorogenic substrate; metabolic labeling; phenotypic heterogeneity 1. Introduction—From 19th Century Microbiology to Modern Day Chemical Biology If chemical biology can be defined as the ‘interrogation of biological systems with chemical approaches’ [1], we must acknowledge some of the first microbiologists as chemical biologists. -
Instructions Calcein AM Cell Viability
IFU0211 Rev 1 Status: RELEASED printed 12/9/2016 11:41:26 AM by Trevigen Document Control Instructions For Research Use Only. Not For Use In Diagnostic Procedures Calcein AM Cell Viability Kit Catalog# 4892-010-K 1000 Tests* *Calculated based on using 1 μM final concentration of Calcein AM; Total number of tests varies with the concentration of Calcein AM required for particular cells. IFU0211 Rev 1 Status: RELEASED printed 12/9/2016 11:41:26 AM by Trevigen Document Control Calcein AM Cell Viability Kit Cat# 4892-010-K Table of Contents Page I. Introduction 1 II. Precautions and Limitations 2 III. Materials Supplied 2 IV. Materials/Equipment Required but not Supplied 2 V. Reagent Preparation 2 VI. Assay Protocol 3 VII. Standardization 4 VIII. Troubleshooting 5 IX. References 5 X. Related Products Available from Trevigen 5 © 2011 Trevigen, Inc. All rights reserved. Trevigen and TACS are registered trademarks and, FlowTACS, TiterTACS, MitoShift and DePsipher are trademarks of Trevigen, Inc. TACS: Trevigen Apoptotic Cell System i E2/25/11v1 IFU0211 Rev 1 Status: RELEASED printed 12/9/2016 11:41:26 AM by Trevigen Document Control I. Introduction Trevigen’s Calcein AM Cell Viability Kit provides a simple, rapid and accurate method to measure cell viability and/or cytotoxicity. Calcein AM (structure A) is a non-fluorescent, hydrophilic compound that easily permeates intact, live cells. The hydrolysis of Calcein AM by intracellular esterases produces calcein (structure B), a hydrophilic, strongly fluorescent compound that is well-retained in the cell cytoplasm. Cells grown in black-walled plates can be stained and quantified in less than two hours. -
Covalent Labeling of Proteins with Fluorescent Compounds for Imaging Applications
Scanning Microscopy Volume 1996 Number 10 The Science of Biological Specimen Article 22 Preparation for Microscopy 8-16-1996 Covalent Labeling of Proteins with Fluorescent Compounds for Imaging Applications Darl R. Swartz Indiana University Medical Center, [email protected] Follow this and additional works at: https://digitalcommons.usu.edu/microscopy Part of the Biology Commons Recommended Citation Swartz, Darl R. (1996) "Covalent Labeling of Proteins with Fluorescent Compounds for Imaging Applications," Scanning Microscopy: Vol. 1996 : No. 10 , Article 22. Available at: https://digitalcommons.usu.edu/microscopy/vol1996/iss10/22 This Article is brought to you for free and open access by the Western Dairy Center at DigitalCommons@USU. It has been accepted for inclusion in Scanning Microscopy by an authorized administrator of DigitalCommons@USU. For more information, please contact [email protected]. Scanning Microscopy Supplement 10, 1996 (pages 273-284) 0892-953X/96$5.00+ .25 Scanning Microscopy International, Chicago (AMF O'Hare), IL 60666 USA COVALENT LABELING OF PROTEINS WITH FLUORESCENT COMPOUNDS FOR IMAGING APPLICATIONS Dari R. Swartz• Department of Anatomy, Indiana University Medical Center, Indianapolis, IN 46202 (Received for publication October 10, 1995 and in revised form August 16, 1996) Abstract Introduction The labeling of proteins with fluorescent compounds Covalent labeling of ligands for imaging applications for microscopy has allowed a greater understanding of is essentially an extension of classical histochemical biological processes. The preparation of fluorescent staining methods in that it is a method which enhances proteins is the first step in development of their use in the contrast of the specimen. The important exception is microscopy. -
Method 1693: Cryptosporidium and Giardia in Disinfected Wastewater by Concentration/IMS/IFA
Office of Water EPA 821-R-14-013 www.epa.gov September 2014 Method 1693: Cryptosporidium and Giardia in Disinfected Wastewater by Concentration/IMS/IFA U.S. Environmental Protection Agency Office of Water (4303T) 1200 Pennsylvania Avenue, NW Washington, DC 20460 Method 1693 Acknowledgments This method is based on the December 2005 revision of EPA Method 1623: Cryptosporidium and Giardia in Water by Filtration/IMS/FA (www.epa.gov/microbes/). Jennifer Clancy and Randi McCuin, of Clancy Environmental Consultants, Inc. performed the research and developed the method procedures to adapt EPA Method 1623 for use in wastewater in a project funded by the Water Environment Research Foundation (WERF) and EPA. Both were consulted during the multiple laboratory validation of the method. Their contributions are gratefully acknowledged. The following laboratories are gratefully acknowledged for their participation in the validation of this method in disinfected wastewater: Analytical Services, Inc.: Corey Fregeau, Kheng Woo, Colin Fricker, and Paul Warden BioVir Laboratories, Inc.: Rick Danielson, Steve Mullaney, and Ghada White CH Diagnostic and Consulting Service, Inc.: Greg Sturbaum, Rhonda Sherman, and Stephanie Long Clancy Environmental Consultants, Inc.: Randi McCuin Lab/Cor Inc.: Derk Wipprecht and Jessica Foulks September 2014 i Method 1693 Disclaimer Neither the United States Government nor any of its employees, contractors, or their employees make any warranty, expressed or implied, or assumes any legal liability or responsibility for any third party’s use of or the results of such use of any information, apparatus, product, or process discussed in this report, or represents that its use by such party would not infringe on privately owned rights. -
Immunocytochemistry (ICC) Handbook
Novus-lu-2945 Immunocytochemistry (ICC) Handbook Learn more | novusbio.com Learn more | novusbio.com Excitation/ Emission Laser Conjugate Notes Emission Color (Excitation Source) DyLightTM 405 400/420 Violet Violet (405 nm) Bright and photostable Alexa Fluor® 405 401/421 Violet Violet (405 nm) Best when used with more abundant targets Can be used with DyLightTM 488, 594 and 647 DyLightTM 350 353/432 Violet-Blue Ultraviolet (355 nm) in multiplexing Often used with Alexa Fluor® 488, 594 and 647 in Alexa Fluor® 350 346/442 Violet-Blue Ultraviolet (355 nm) multiplexing, best for high-abundance targets Brighter, photostable replacement for FITC; DyLightTM 488 493/518 Green Blue (488) not suitable for use with GFP Photostable over a broad pH range; Alexa Fluor® 488 495/519 Green Blue (488) replaces FITC Small organic fluorophore; cannot be used with FITC 495/519 Green Blue (488) DyLightTM 488, Alexa Fluor® 488 or GFP Violet Superior alternative to Pacific Orange; good choice DyLightTM 405LS 397/572 Yellow (405 nm) for multicolor applications on the violet laser Photostable over a broad pH range; Alexa Fluor® 546 556/573 Yellow Yellow-Green (561 nm) brighter than Cy3 DyLightTM 550 562/576 Yellow Yellow-Green (561 nm) Subject to photobleaching; can be excited by the PE 565/578 Yellow Yellow-Green (561 nm) 488, 532, and 561nm lasers on flow cytometers Very bright fluorescence; use a tunable dye laser Texas Red® 595/613 Orange Yellow-Green (561 nm) to avoid leaking when multiplexed with PE Alexa Fluor® 594 590/617 Orange Yellow-Green (561 nm) Better photostability than Texas Red DyLightTM 650 654/673 Red Red (633 nm) Bright fluorescent protein; do not use with APC 650/660 Red Red (633 nm) DyLightTM 650 due to overlapping emission spec- tra Extremely photostable, good Alexa Fluor® 647 650/665 Red Red (633 nm) replacement for Cy5 or APC Some fluorescence quenching when Cy5TM 647/665 Red Red (633 nm) conjugated DyLightTM is a registered trademark of Thermo Fisher Scientific Inc.