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  1. Fluorescent Proteins 101: Green Fluorescent Protein (GFP)

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    Blog Post
    ...Bioluminescence and fluorescence from proteins such as Green Fluorescent Protein (GFP) has likely existed... begin to study GFP and deduce its biochemical properties. Now GFP and its fluorescent derivatives are...backbones for constructing fluorescent fusions. Transcription Reporter: Placing GFP under the control of a...type of transcription reporting was among the earliest uses of GFP. Fluorescence resonance energy transfer...common fluorophores Fluorescent Protein Mutations Relative to Wildtype GFP EGFP F64L; S65T EYFP S65G...halves of EGFP undergo folding, maturation, and fluorescence. Biosensors: A wide array of GFP-based fluorescent...common applications in the lab. Why Green Fluorescent Protein? GFP is a ~27 kDa protein consisting of 238...
  2. Fluorescent Proteins 101: History of Fluorescent Proteins

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    ...luciferases, as well as fluorescent ones, like Green Fluorescent Protein (GFP). These molecules occur ...laboratory. The discovery of GFP The story of how fluorescent proteins like GFP came to be used as research...their work on GFP. This great honor serves to highlight how useful fluorescent proteins like GFP really are...victoria gene responsible for encoding GFP, and, in 1992, he reported its sequence. Soon after that, in 1994...spectrum that GFP and its derivatives did not previously reach. Nobel Prize for fluorescent proteins The...learning more about fluorescent proteins, I invite you to download our Fluorescent Protein eBook and learn... calcium ions, and the second, which we now call GFP, absorbs that blue light and glows green. In the ...
  3. Four Base Editing Reporters to Monitor and Enrich Editing in Real-time

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    ...that used an integrated GFP reporter that is converted into BFP (blue fluorescent protein) upon CRISPR/Cas9...not just fluorescent proteins. Figure 4: Reporters in Gene On include a mScarlet reporter, luciferase... their hypothesis with GFP fluorescence. To do this they generated a silent GFP construct, that contains... induction of GFP fluorescence confirming the efficacy of GO as a base-editing reporter. As the initiation...mCherry that restores fluorescence to monitor APOBEC-Cas-9 mediated editing. eGFP reporters for single base ...DSB in their previous reporter, the Harris Lab created a panel of eGFP reporters to quantify the on-target...editing reporters. Image from St. Martin et al., 2019. The Harris lab used these eGFP reporters to analyze...
  4. FlipGFP, a novel fluorescence protease reporter to study apoptosis

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    Blog Post
    ...and fluoresce. FlipCherry: Red fluorescence protease reporter To add to the fluorogenic reporter toolkit...genetically encoded fluorescent executioner caspase reporters. Several apoptosis reporters have been developed...results in a change in fluorescence emission. FRET and fluorescence based reporters however have several...apoptosis reporter, ZipGFP, which utilized the self-assembling split GFP (GFP1-10 and GFP11) to increase...self-assembling split GFP (GFP1-9 and GFP10-11) by flipping a single β-strand of GFP, hence the name FlipGFP. FlipGFP...increases fluorescence 100-fold compared to other reporters (Zhang et al., 2019). How does FlipGFP work? ...transfer (FRET)-based executioner caspase reporters. In these reporters, the FRET pair is linked by a caspase...
  5. Teaching an Old DOG New Tricks: Controlling Protein Activity with GFP

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    ...GBPs/GFP. The new system, CRE-DOG (Cre Dependent On GFP), is activated by GFP and derivatives GFP and ... of GFP. These systems, known as T-DDOG and Cre-DOG, respectively, repurpose popular GFP reporter lines...to bind GFP. The idea of using GFP as a scaffold suddenly seemed very realistic. Envisioning GFP as a substrate...a UAS-driven luciferase reporter construct. In the absence of GFP, no reporter output was observed in ...electroporated T-DDOGs, GFP, and a reporter construct into the mouse retina. GFP expression robustly activated...T-DDOGs with two mouse GFP reporter lines; again, TdTomato was seen only in cells with GFP, at a high activation...lines expressing GFP in specific cell types to do more than just label cells. If GFP could be co-opted...
  6. Fluorescent CRISPR Reporters: SRIRACCHA and GEmCherry2

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    ...histone)-GFP reporter into the genome of mammalian cells.  Figure 1: The SRIRACCHA reporter construct...background fluorescence and in-frame fluorescence.  Figure 2: The GEmCherry reporter. Image from... Recently scientists have created CRISPR fluorescent reporter assays to quantify targeted Cas9 cleavage...(NHEJ). In these reporters, editing typically results in a change in the fluorescent readout. In this ...this blog we will focus on two fluorescent CRISPR reporter methods, SRIRACCHA and GEMCherry2. We will cover... CRISPR reporters in the near future.  SRIRACCHA (stable, but reversible, integrated reporter for assaying... the supplied donor plasmid will express GFP. If there’s GFP expression, presumably the endogenous target...
  7. Fluorescent Biosensors for Measuring Autophagic Flux

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    ...estimated by the GFP/RFP ratio: a decrease in GFP fluorescence relative to RFP fluorescence suggests an increase...Addgene! mRFP-GFP-LC3 tandem fluorescent protein This autophagy biosensor contains mRFP and GFP fused to the...puncta. Find the mRFP-GFP-LC3 plasmid at Addgene! GFP-LC3-RFP-LC3∆G: A fluorescent probe that releases ...biosensor is the GFP-LC3-RFP-LC3ΔG probe. It’s similar to the mRFP-GFP-LC3 Tandem Fluorescent Protein, but... flux, while an increase in GFP fluorescence relative to RFP fluorescence suggests a decrease in autophagic...autophagy. The development of several fluorescent autophagy reporters now allows for the measurement of autophagic... to emission of only red fluorescence. The ratio of red to green fluorescence allows for clear distinction...
  8. Visualizing Translation at the Single Molecule Level

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    ...occur. For a TRICK reporter mRNA this displacement leads to a change in the fluorescent signal: untranslated...following components: a GFP protein that binds to the coding region of a reporter mRNA via a PP7 coat protein...protein (NLS-PCP-GFP) an RFP protein that binds to the 3’ UTR of the reporter mRNA via an MS2 coat protein...NLS-MS2-RFP) the reporter mRNA, which contains the tethering sites for the fluorescent proteins and is ...64543) Before translation, both GFP and RFP are bound to the reporter, causing it to appear yellow. The...translation pushes NLS-PCP-GFP off of the mRNA, leaving only a red FP bound to the reporter. Because it contains...translation is necessary for removal of GFP from the TRICK reporter. Delayed translation is known to be important...
  9. RANbodies: Reporter Nanobody Fusions

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    ...Amplifying weak signals of fluorescent protein (i.e. GFP, RFP) Detecting GFP reconstitution across synaptic...tagged and instead are conjugated to reporters (i.e. fluorescent dyes, HRP, etc. ) after purification....detectable by two different tags: a reporter and an HA tag. The reporter comes in three varieties: HRP, Spaghetti...independent of the reporter. The only caveat is that HA staining is weaker than reporter staining. Picking...Picking the right reporter for your RANBody While all three reporters stain cultured cells and tissue sections... have 10 HA or 10 MYC tags built into a GFP scaffold. Some GFP nanobodies  stain poorly when tagged with...Monster, and Chicken IgY Domain RANbody Reporters. Reporter Detection Method Uses Pros Cons Antigens...
  10. Hot Plasmids - June 2020 - Barcoded CRISPR Library, Sparse Cell Labeling, Calcineurin Reporter, and DNA Staining Dye Alternative

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    ...https://doi.org/10.1101/788679 A destabilized GFP reporter for calcineurin activity in yeast Article contributed...calcineurin transcriptional reporter consisting of a quickly-degraded destabilized GFP variant fused to a 4X...bottom panels) equipped with destabilized GFP calcineurin reporter (blue) and stained with PI (pink) to indicate... Image from Diessl et al., 2020. Find the GFP reporter calcineurin activity here Diessl et al., Microbial...stranded DNA bound by tTALE-FP with the fluorescent protein fluorescing green. Image from Shin et al., 2019...intercalating fluorescent dyes for DNA-protein interaction studies? Kyubong Jo's lab generated fluorescent protein...attached fluorescent protein to the DNA. They created plasmids for purification of tTALE-eGFP and tTALE-mCherry...
  11. Fluorescent Proteins 101: When GFP lets you down

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    ...fusion with GFP allows for detection of genomic locations (Chen et al., 2013). GFP fluorescence overlaps...Introduction to GFP Read our Fluorescent Proteins Blog Posts Download the Fluorescent Proteins 101 eBook...S65T) in the original jellyfish GFP (AvGFP) to create enhanced GFP (EGFP), a variant with improved brightness... There are numerous GFP variants. Here I use the name ‘GFP’, which refers to mEGFP. This variant was made...consequence GFP remains non-fluorescent under anaerobic conditions. This holds true for any of the AvGFP and ...of Amsterdam). GFP is the most popular, most widely used genetically encoded fluorescent probe. Several...popularity of GFP including (i) fast and complete maturation to functional, fluorescent protein in almost...
  12. Sensing Neuronal Dopamine

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    ...similar strategy: a GFP variant bound to a DA receptor, such that the GFP fluoresces upon DA-receptor binding...sensor is a single fluorescent protein-based sensor. This sensor was engineered from a GFP variant and a DA... DA receptor such that GFP fluoresces when the receptor is bound by DA. Two variants of the sensor, dLight1.1...this, researchers from some labs have developed fluorescent-protein based DA sensors (Figure 2). The dLight1...affinity and high-magnitude responses (increases in fluorescence) at low concentrations (e.g., 100 nm) of DA....behaving mice to gather the following types of data: Report time-course and concentration of released DA in...optogenetically activated and inhibited neurons in live mice Report modulation of DA signaling during learning and ...
  13. When is a Monomer not a Monomer? The Top Three Ways Your Favorite Fluorescent Protein Oligomerizes in Cells

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    ...you're using green fluorescent protein or Enhanced Green Fluorescent Protein (GFP/EGFP) for a transcriptional...dimerize. That means that your POI fused to GFP or another fluorescent protein (FP) could be forming dimers ...remain unaware that EGFP/GFP is prone to forming noncovalent dimers. This property of EGFP can lead to significant...contributed by guest blogger Erik L. Snapp. Stop using EGFP/GFP for fusion proteins! Despite multiple studies ...in the world, is not inert. In all seriousness, EGFP/GFP has a real nontrivial propensity to noncovalently...best solution is to use truly monomeric FPs. EGFP and other GFP family members (superfolder, Emerald, CFP...designated mEGFP, mVenus, etc. A word of caution is needed because FPs not derived from GFP, i.e. the ...
  14. SunTag and Fluorescent Imaging

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    ...turn up the brightness in your fluorescent imaging experiments. Fluorescent protein fusions One of the easiest...-molecule reporter of intracellular processes. Initially, Tanenbaum et al. observed some GFP aggregation...scaffold fully occupied with GFP has a molecular weight of 1,400 kDa vs 24 kDa for GFP alone. Although traditional...Blog Sign Up to Receive the Fluorescent Protein eBook Avoid Fluorescent Protein Oligomerization Learn...Resources on Addgene.org Find Fluorescent Protein Empy Backbones Visit Our Fluorescent Protein Guide Page Find...aggregation, which they reduced by using superfolder GFP (sfGFP) with the small solubility tag GB1. In SunTag...nomenclature throughout the rest of this blog post, GFP refers to sfGFP-GB1.   Tanenbaum et al. examined the power...
  15. Seeing Red: Simple GFP Photoconversion

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    ...process worked well with the common GFP variants EGFP, mGFP4-T, and S65T GFP, and no red color was observed...you’ve used a GFP derivative to conduct subcellular localization studies or make a reporter construct. Fluorescent...exciting GFP-labeled plant cells at 405 nm instead of 488 nm, Sattarzadeh et al. noticed that GFP had turned...cytosol-targeted GFP. White circles represent the irradiated area. Photoconverted GFP spreads through ...Applications and limitations of GFP photoconversion One concern with photoconverting GFP is the expression level...intensity increases with GFP concentration and saturates around 30 uM. For low-abundance GFP fusions, a photoconversion...repurpose GFP is great news for microscopy enthusiasts! Addgene has empty backbones containing GFP variants...
  16. Fluorescent Proteins 101: Luciferase

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    ...bioluminescent reporter occurs slower than fluorescent-based methods, such as excitation of Green Fluorescent Protein...Fluorecent Proteins in Nano Lanterns Reporter gene assays A reporter gene, such as luciferase, usually serves...excite GFP. As a result of the different mechanisms to produce photons, chemiluminescent reporters are generally...luminescence versus fluorescence.  Table 1: Properties of Luminescence versus Fluorescence   Luminescence... is also the most commonly used bioluminescent reporter. This beetle emits a yellow-green light with a...several studies utilized luciferase as a genetic reporter in plant and mammalian cells. Luciferase assays...available to choose from) is now a common feature in reporter plasmids.  Learn How Luciferase Can Be Used In...
  17. Split Fluorescent Proteins for Studying Protein-Protein Interactions

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    ...Chang-Deng Hu Green sfGFP Split super-folder GFP, our most-requested GFP(1-10) and GFP(11) Versatile protein...split fluorescent protein. Kamiyama et al. Nat Commun. 2016 Bo Huang spGFP Split superpositive GFP Split-superpositive...assemble the full structure of the fluorescent protein, producing fluorescent signal. Image modified from Feng...) for use with GFP(11) Multiplexed labeling of cellular proteins with split fluorescent protein tags. ...Identification of new fluorescent protein fragments for bimolecular fluorescence complementation analysis...
  18. 28 Hot Plasmid Technologies from 2015

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    ...customized fluorescent reporters can be challenging enough, but incorporating multiple reporters into a single... issues with fluorescent pH sensors, a set of luciferase-fluorophore pH fusion reporters, pRSETb-pHlash... three components: a GFP protein that binds to the coding region of a reporter mRNA via a PP7 coat protein...protein (NLS-PCP-GFP) a RFP protein that binds to the 3’ UTR of the reporter mRNA via an MS2 coat protein...NLS-MS2-RFP) the reporter mRNA, which contains the tethering sites for the fluorescent proteins and an ...64543or 64542) When the reporter mRNA is first transcribed, it is bound by both the GFP and the RFP proteins...their reporter mRNAs. Using the TRICK plasmids, Halstead et al demonstrated that 91% of reporter mRNAs...
  19. Fluorescent Proteins 101: Fluorescent Biosensors

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    ...and fluorescent reporters being especially popular. We’ll give you an introduction to fluorescent biosensors... of fluorescently-labeled components Fluorescence-activated cell sorting (for cells); fluorescent HPLC...detects. This change then generates a reporter signal. Reporter signals may be electrochemical or light-based...Picking your reporter Don’t forget about the other end of the biosensor: which fluorescent protein is most...calcium and zinc. Some biosensors contain a single fluorescent protein fused to a domain that senses the concentration...biosensors as an example. Many calcium biosensors include GFP fused to calmodulin (CaM) and the chicken myosin ...When calcium is absent, the construct does not fluoresce; when present, calcium induces CaM/RS20 interaction...
  20. Rosella: A Fluorescent pH-Biosensor for Studying Autophagy

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    ...tandem fluorescent proteins: a relatively pH-insensitive RFP variant, DsRed.T3 and a pH-sensitive GFP variant... is the permanent fluorescent tag portion of Rosella: it will emit red fluorescence regardless of its ...the fluorescent properties of Rosella.   Table 2: Effect of Localization on Rosella’s fluorescence emission...green fluorescence accumulates in the vacuole. See Figure 2 for an example of what fluorescence looks ...Devenish, R. J. (2008). Rosella: A fluorescent pH-biosensor for reporting vacuolar turnover of cytosol and...mammalian cells using a single fluorescent biosensor. Scientific Reports,5(1). doi:10.1038/srep12397. PubMed...Addgene Blog Beware of Fluorescent Protein Oligomerization Seeing Red: Simple GFP Photoconversion Light...
  21. Bacterial Expression Systems

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    ...Tagging Purification Controlled Expression Reporter Plasmids Reporter Plasmids Tagging and Visualization Purification...Photoconvertible , and Photoswitchable fluorescent proteins Various PIs Fluorescent protein fusion: contains empty...with N and C-terminal fluorescent protein tags that can be used to create fluorescent protein fusions with...cyan fluorescent protein variant (CyPet) optimized for FRET measurements with a yellow fluorescent protein...yellow fluorescent protein variant (YPet) optimized for FRET measurements with a cyan fluorescent protein...pRSETa mEos2 20341 mEos2 (fluorescent protein) Loren Looger Photoactivable Fluorescent Protein Expression: ...many different restriction enzymes. pPro24-gfp contains GFP but all others are empty. pdCas9-bacteria ...
  22. 22 Hot Plasmid Technologies from 2014

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    ...dim GFPs The availability of the three dimensional structure of GFP, its brighter mutant S65T-GFP, and...induction of both DsRed fluorescence and GFP shRNA. Mice carrying the R26DsRedR; CRUSH-GFP; and Nestin-Cre alleles...scientists to engineer a wide variety of GFPs with diversity in fluorescence brightness, intensity, excitation...gene editing. Dr. Masahito Ikawa has created a GFP reporter plasmid for scientists to validate the efficacy...functional complementation between two non-fluorescent split GFP fragments. When the two fragments, expressed...proximity in the synaptic cleft, functional fluorescent GFP is reconstituted in vivo. Currently available...identified a family of GFP proteins in the cephalochordate Branchiostoma floridae, named bfloGFPs. They went on...
  23. New and Upcoming Viral Vectors - Spring 2019

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    ...pAAV.hSyn-FLEX.iGABASnFR.F102G pAAV-Syn-Archon1-KGC-GFP-ER2 pAAV-Syn-FLEX-rc [Archon1-KGC-GFP-ER2] pAAV-FLEX-tdTomato pAAV-GFAP104...pAAV-mDlx-NLS-mRuby2 CAG-NLS-GFP pAAV-hSyn-mCherry Read on to learn more!  Calcium sensor AAV The GFP-based calcium...pAAV-Syn-Archon1-KGC-GFP-ER2) and cre-dependent version (pAAV-Syn-FLEX-rc [Archon1-KGC-GFP-ER2]) of this membrane-embedding...cre-dependent version at Addgene! Fluorescent protein and control AAV These fluorescent protein expression vectors...exhibits high contrast between peak fluorescence and resting fluorescence. It is useful for activity imaging...exhibits high contrast between peak fluorescence and resting fluorescence.  It is useful for activity imaging...37825  AAV8*, AAV9*  pAAV-CAG-GFP 50465  AAV8*, AAV9*  pAAV-hSyn-EGFP *Also coming in our new 20 ...
  24. Hot Plasmids - May 2022

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    ...line expressing a GFP-tagged version of a protein of interest. The binding of the GFP nanobody to its target... proximity to the GFP-tagged protein (albeit slightly offset due to the nanobody-GFP interaction). The...localization peptides, and reporters that drive the expression of the fluorescent protein by a specific transcription...ligase TurboID fused to a conditionally stabilized GFP-nanobody rather than a specific protein of interest... a cleavage free manner. The dCas9-SSAP system reports an efficiency of up to 20%, comparable to commonly... For a one kilobase insertion, the researchers reported an editing error rate of less than 0.3%, both ...application. Each visual barcode consists of a fluorescent protein coupled to a specific subcellular localization...
  25. Fluorescent Proteins 101: Photoactivatable Fluorescent Proteins

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    ...irreversible PA-FP reported was PA-GFP. PA-GFP was derived from Jellyfish (Aequorea victoria) GFP (wtGFP) by mutating...from low fluorescent states to high fluorescence states, they can change from one fluorescent color to...proteins. Photoactivatable fluorescent proteins (PA-FPs) are fluorescent proteins that display unique...their fluorescence can be switched on and off reversibly. This ability to modulate fluorescence allows...switched on from a state of dim or no fluorescence, to a brighter fluorescent state by exposure to a specific...causing increased fluorescence when excited with 488nm blue light. The T203H mutation in PA-GFP generates a ...that is more neutral, causing PA-GFP to display almost no fluorescence when illuminated with 488nm light...
  26. Bright Monomeric Fluorescent Proteins: mNeonGreen, mTFP1, and mWasabi

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    ...the addition of the enhanced GFP (EGFP)-type termini. mNeonGreen was reported as the brightest monomeric...deposit plasmids containing the fluorescent protein mNeonGreen. This fluorescent protein joins mTFP1 and mWasabi...mNeonGreen: a yellow-green fluorescent protein mNeonGreen is a yellow-green fluorescent protein that was derived...yellow fluorescent protein wavelengths, it can be imaged either with standard green fluorescent protein... other fluorescent proteins. Find mNeonGreen plasmids here! mTFP1: a monomeric teal fluorescent protein...proteins is that they are monomeric fluorescent proteins. Fluorescent proteins that oligomerize often affect...Clavularia cyan fluorescent protein: structural characterization and applications in fluorescence imaging." ...
  27. Fluorescent Proteins 101: Monitoring Cell Mobility Using Fluorescent Proteins

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    ...many fluorescent proteins. Additional fluorescent protein tools Photoactivable fluorescent proteins (proteins...track fluorescently labeled cells? 1. Epifluorescence microscopy This technique uses a fluorescence microscope...Laser include: Blue-green fluorescent proteins like EGFP Yellow-orange fluorescent proteins like TagRFP, ...the visualization of fluorescent proteins expressed in the specimen.  2. Fluorescence Activated Cell Sorter...trafficking studies enabled by fluorescent proteins The optimization of GFP and its derivatives by the late... to track where GFP labelled B cells were in mounted slices of these organs. These GFP labelled cells ... By using cells labelled by fluorescent chemicals or by other fluorescent proteins, labs were also able...
  28. Fluorescent Protein Guide: Biosensors

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    ...cyclic AMP) Signaling reporter island (SiRI) with GFP-based fluorescent reporter cAMPr Spatial Multiplexing... Plasmid Collections Fluorescent Proteins Fluorescent Biosensors Fluorescent Proteins: Biosensors Metal... AAV Biosensors Fluorescent biosensors are proteins designed so that their fluorescent properties are ...Calcium erGAP3 (GFP-Aequorin Protein) for imaging of Ca+ dynamics in endoplasmic reticulum GFP-Aequorin Protein...sensor (GECI) that reports with lifetime and intensity changes A turquoise fluorescence lifetime-based biosensor... Green fluorescence indicator of K+ for optical imaging (GINKO) Genetically encoded fluorescent indicators...imaging (Perceval) A genetically encoded fluorescent reporter of ATP:ADP ratio. Nat Methods. 2009 Feb ...
  29. Quick Guide to Near-Infrared Fluorescent Proteins

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    ...  NIR reporters and biosensors NIR reporters can tell us about cellular events via  fluorescence changes...after normalization to fluorescence of co-transfected EGFP. e Originally reported as a monomer16, IFP2.0...directed evolution approach applied to fluorescent voltage reporters. Nat Chem Biol 14, 352-360 (2018). Yu...College of Medicine. Several sets of near-infrared fluorescent proteins (NIR FPs) and biosensors have been created...Addgene. Biliverdin chromophore Near-infrared fluorescent proteins (NIR FPs) were derived from natural ... state-of-the-art NIR FPs can be used similar to GFP-like probes by supplying a single gene to cells. ...their molecular brightness (a product of the fluorescence quantum yield and the extinction coefficient...
  30. Plasmids 101: Gene, enhancer, and promoter trapping

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    ...any way. For example, if green fluorescent protein (GFP) was the reporter gene and green cells were observed...fundamentally the reporter construct monitors the expression of a nearby gene. The reporter gene serves as...gene. The actual reporter construct can be something phenotypic (such as a fluorescent protein or something... screens to introduce reporters throughout an organism’s genome. These reporters have historically been...stimulate the expression of the reporter. The system is made up of a reporter gene flanked by a minimal promoter...promoter – all rely on the random integration of a reporter construct in close proximity to an endogenous ...developmental stage you could infer that the gene which GFP was monitoring was being expressed in the same pattern...
  31. Hot Plasmids - January 2023

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    ...released Anti-GFP [N86/8R] as another option for targeting GFP. But why might you need a second GFP antibody...PMCID: PMC9015817.   Meet anti-GFP [N86/8R]! by: Ashley Waldron Anti-GFP [N86/38.1R] was among the first...western blot for mEGFP-HRas (from Plasmid 18662). See the Applications section on the Anti-GFP [N86/8R] page...consider hfYFP and LSSmGFP.     Fig. 4: hfYFP retains folding and fluorescence in high molarity ...system Heat-inducible lentiviral Car constructs Anti-GFP [N86/8R] ready-to-use antibody Hyperfolder YFP ...ubiquitous promoter drives expression of an mCherry reporter.  After using mCherry for FACS sorting of the ...?  Similarities:  Generated against full length GFP and converted to recombinant form by the NeuroMab...
  32. Fluorescent Proteins 101: GFP Fusion Proteins - Making the Right Connection

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    ...Protein size and shape matters The green fluorescent protein (GFP) from Aequorea victoria and its variants...genetically encoded fluorescent probes. One of the limitations is the size of GFP: ~240 amino acids or...oligomerization of fluorescent proteins is a concern. The propensity of fluorescent proteins to oligomerize...Since the fluorescent tag should operate as an inert light emitting module, any tendency of GFP to homodimerize...early days of GFP applications, many were concerned with steric hindrance by the fluorescent protein. Thus...that the C-terminus of fluorescent proteins derived from Aequorea victoria GFP sticks out and can be considered...of the fluorescent protein are relatively close together (figure 1). Where should the fluorescent protein...
  33. Opto-Nanobodies: Using Light to Manipulate Cell Signaling and Protein Purification

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    ...OptoNB-SOS activated Ras/Erk signaling by using a fluorescent reporter for Erk kinase translocation. These results...Lab monitored how AsLOV2 insertion into mCherry or GFP nanobodies affected binding of their target proteins...protein. OptoNBs were also tagged with an infrared fluorescent protein tag which let the team detect its co-...co-localization with a membrane-localized mCherry or GFP protein. With this system, if the OptoNB can bind...more OptoNBs, one against mCherry and one against GFP. Insertion of AsLOV2 into loop 1 always generated....  AsLOV2 Inertion Site mCherry #1 mCherry #2 GFP Loop 1 dark-induced dark-induced dark-induced ...revealed a blue light-dependent shift in mCherry fluorescent to the surface of the bead, suggesting that OptoNBs...
  34. Multicolor Animals: Using Fluorescent Proteins to Understand Single Cell Behavior

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    ... from the default GFP (green) to RFP, CFP, or YFP fluorescence. In Brainbow 2.1, GFP is tagged with a ...to excise the non-fluorescent YFP and activate fluorescence of the downstream OFP, GFP, or RFP. Cells that...default, they are not fluorescent. Instead, they incorporate a truncated, non-fluorescent form of YFP as the...combination of all of the fluorescent proteins from the injected construct. The fluorescent protein expressed ...upstream of the fluorescent protein genes, Cre recombination is required before fluorescence can occur. Cre...Visit our fluorescent proteins topic page Resources on Addgene.org Browse Addgene’s fluorescent protein...fluorophores mOrange2, EGFP, and mKate2 (red) to solve the problematically low fluorescent intensity of previous...
  35. Hot Plasmids: Fall 2024

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    ...460 nm) is shorter than many popular fluorescence markers like GFP (510 nm), allowing co-imaging. And because...gene disruption in M. abscessus  Bioluminescent reporter of mechanical forces   Epitope tag antibody ...Western Blot for Anti-V5 [IPI-SV5-Pk1]. Addgene Report, https://doi.org/10.57733/addgene.l0ulu4. Hanke... imaging in C. elegans By Alyssa Neuhaus Red fluorescent proteins like mScarlet are essential tools for...considerably faster, with expression levels comparable to GFP during early embryogenesis (Figure 3). mScarlet-I3...through the middle of each embryo are shown, comparing GFP, wrmScarlet (mScarlet), and the new mScarlet3 and...2024 under CC-BY license.  These optimized fluorescent proteins will be a useful addition to the toolkit...
  36. Antibodies 101: Designing Your First Flow Panel

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    ...labeling proteins is to fuse them with a fluorescent reporter, such as GFP or mCherry, through genetic modification...with that reporter, you can infer its presence through detecting the reporter's fluorescence. Another ...mentioned previously, you can also use fluorescent reporters, such as GFP, and fluorophore-conjugated antibodies.... Next comes our transduction reporter, eGFP. As eGFP emits fluorescence by itself and does not need to...The combination of antibody-fluorophores, fluorescent reporters, and/or dye stains used in your flow cytometry...vector also encodes for eGFP, which serves as a transduction reporter. Note that eGFP is not fused to CD45...overlap. Figure 4 compares the spectra of enhanced GFP (eGFP) and FITC, the latter being a commonly used fluorophore...
  37. Fluorescent Proteins 101: Aptamer Fluorophores

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    ...nature of GFP fluorescence to create an improved fluorescent aptamer system. Knowing that GFP’s  structure...oligonucleotides in fluorescent visualization techniques for decades, most notably for fluorescent in situ hybridization...applications including aptamer based fluorescent biosensors. Aptabeacons Fluorescence resonance energy transfer ...aptamers fluoresce until they bind to the appropriate ligand, but relying on a lack of fluorescence for readout...applications. Learn About Fluorescent Biosensors Light-up aptamers (or, fluorescing with veggies) Though the...the fluorogen and increase its fluorescence, essentially mimicking GFP.  Though the aptamer, called Spinach... Experiments Learn more about GFP Controlling Protein Activity with GFP Resources at Addgene.org Find...
  38. Hot Plasmids - August 2020

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    ...GABA-ergic interneurons. These include mDlx-GFP, hDlx-FLEX-GFP, hDlx-Flex-dTomato, mDlx-GCaMP6f, hDlx-GiDREADD-dTomato...into the hPSC genome using AAV1 and contain an EGFP reporter. Expression of the dCas9-KRAB activator or dCas9...in this post: Yeast-based protein evolution Fluorescent tools for mammalian cells Nanobody purification...enables tracking of protease activity with a fluorescent protein--no affinity purification required! The...doi.org/10.1038/s41592-019-0665-7 Optimizing fluorescent tools for labeling structures and compartments...mammalian cells By Angela Abitua Genetically encoded fluorescent proteins are often used to label  specific structures...biomolecules within cells. However, sometimes these fluorescent proteins might not localize to the right places...
  39. Synthetic promoter AAVs for cell-type specific expression in retinal cells

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    ...an optogenetic reporter, channelrhodopsin, fused to a fluorescent GFP marker (CatCH-GFP). The lab deposited...expression of a Cre-dependent fluorescent CatCH-GFP reporter. Expression of GFP will only result in cells ...mice to test for cell type-specific expression of GFP. Half (113) expressed in retinal cells four weeks...photoreceptors and horizontal cells, and Cre-dependent-GFP expresses in horizontal cells and ganglion cells,...transduced by both AAVs would express Cre-mCherry and GFP.   Figure 2: Synthetic promoters can be paired...
  40. Plasmid Tools for Microbiome Studies

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    ...the RBS and allows translation of the reporter gene resulting in GFP signal. With the addition of standards...agglomeration of fluorescent proteins into one particle within the cell, the lab fused the red fluorescent protein...microbiome by using engineered genetic tools and reporter microbes. Let’s take a look at a few of these ...selectable marker and a desired genetic payload (ex: GFP). Thus, cells can be both sorted using FACS and isolated...is a ribosome binding site (RBS) followed by a reporter gene. The hairpin blocks translation by sequestering...different bee species. BTK can be used to introduce fluorescent markers to visualize localization and distribution...division counting (DCDC), relies on the assembly of fluorescent proteins into one bright particle that segregates...
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