Wikipedia

Fluorescence-activating and absorption-shifting tag

FAST (Fluorescence-Activating and absorption-Shifting Tag) is a genetically-encoded protein tag which, upon reversible combination with a fluorogenic chromophore, allows the reporting of proteins of interest. FAST, a small 14 kDa protein, was engineered from the photoactive yellow protein (PYP) by directed evolution. It was disclosed for the first time in 2016 by researchers from Ecole normale supérieure de Paris.[1] FAST was further evolved into splitFAST (2019), a complementation system for protein-protein interaction monitoring, and CATCHFIRE (2023), a self-reporting protein dimerizing system.

Mechanism

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Fluorogenic protein-based strategies for labeling, sensing, and actuation

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Fluorescence imaging has become ubiquitous in cell and molecular biology. GFP-like fluorescent proteins have revolutionized fluorescence microscopy, giving researchers exquisite control over the localization, function and fate, of tagged constructs. Lately, have been developed alternative systems based on a fluorogenic interaction between a protein tag, which affords the classic advantages of protein tagging, i.e., absolute labeling specificity and localization, and an external chromophore, dark until combination with its cognate protein tag. Chromophores span from naturally occurring chromophores, e.g., flavin mononucleotide (FMN) with LOV-sensing domains, biliverdin with phytochromes, bilirubin with UnaG, to synthetic fluorophores with SNAP-tag, CLIP-tag, HaloTag. While initially designed as fluorescent labels, these systems also present opportunities for sensing and actuating.[2]

FAST and its derivates, splitFAST and CATCHFIRE, pertain to these novel chemical-genetic strategies.

 
Reversible binding between FAST and a fluorogene

FAST

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FAST is a 125 amino acid protein engineered from the photosensitive PYP. Not fluorescent by itself, it can bind selectively a fluorogenic chromophore derived from 4-hydroxybenzylidene rhodanine, which is itself non fluorescent unless bound. Once bound, the pair of molecules goes through a unique fluorogen activation mechanism based on two spectroscopic changes, increase of fluorescence quantum yield and absorption red shift, hence providing high labeling selectivity. Several versions of FAST have been described differing by a small number of mutations, e.g., Y-FAST, iFAST, pFAST, greenFAST, redFAST, frFAST, nirFAST, nanoFAST, or dimers of those. Also, a number of fluorogenic chromophores were developed, varying by their emission wavelength, their brightness and their tag affinity. Some are non permeant, i.e., they can't go through cell membranes, hence specifically labeling membrane proteins or extracellular proteins, allowing for, e.g., monitoring trafficking from synthesis until excretion.[3]

FAST participates in the race towards near infra-red reporting, much needed for full organism imaging, while allowing deep tissue penetration, reduced photodamage to living organisms, and a high signal-to-noise ratio.[4]

 
splitFAST, a split fluorescent reporter

splitFAST

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splitFAST is a fluorescence complementation system for the visualization of transient protein-protein interactions in living cells. Engineered from the fluorogenic reporter FAST, splitFAST consists of two protein moieties, NFAST (114 amino acids) and CFAST (10 or 11 amino acids). Each being genetically fused to one protein of interest, they, upon interaction of their corresponding proteins, reconstitute the complete FAST which is then capable to combine with any FAST fluorogen and illuminate the interaction. splitFAST offers a powerful alternative to conventional imaging techniques for protein-protein interactions, i.e., Föster Resonance Energy Transfer (FRET) and bimolecular fluorescence complementation (BiFC). Indeed, easy to implement, splitFAST complementation was shown fully reversible and disassembly rapid, which allows not only the real-time monitoring of protein complex assembly but also the real-time monitoring of protein complex disassembly.[5]

A tripartite splitFAST was further developed.[6]

CATCHFIRE

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An evolution of FAST and splitFAST, CATCHFIRE implements the genetic fusion of a pair of proteins of interest to small FAST-based dimerizing domains, FIREtag and FIREmate.  The addition of fluorogenic inducers, small molecules of the "match" series, e.g., match540, match550, matchDark, drives the interaction between FIREtag and FIREmate, hence inducing the proximity of proteins of interest.  When both domains interact, then the match molecule sees its fluorescence increase by 100X.  One can then observe the newly induced interaction by fluorescence microscopy.  A further key feature of CATCHFIRE is its reversibility, hence the first ever self-reporting reversible dimerizing system. CATCHFIRE allows the control and tracking of protein localization, protein trafficking, organelle transport and cellular processes, opening avenues for studying or controlling biological processes with high spatiotemporal resolution. Its fluorogenic nature allows the design of a new class of biosensors for the study of processes such as signal transduction and apoptosis.[7]

Applications

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The FAST-fluorogen reporting system is used to explore the living world, from protein reporting (e.g., for protein trafficking), protein-protein interaction monitoring (and a number of biosensors), to chemically induced dimerization. It is implemented in fluorescence microscopy, flow cytometry and any other fluorometric methods. FAST has also been reported for super-resolution microscopy of living cells.[8]

In anaerobic microbiology

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Because of its unique capacity of fluorescence in zero-oxygen conditions, FAST has been widely used in anaerobes, for example to enable metabolic engineering of Clostridium or related bacteria long known in biomass fermentation.[9] For the same purpose, it has been used in methanogenic archaea, namely Methanococcus maripaludis and Methanosarcina acetivorans.[10] It was also implemented for pathogen studies, i.e., the bacterium Clostridioides difficile[11] and the prozoan Giardia intestinalis.[12]

Besides, FAST allows to monitor microbial activity in low oxygen conditions such as maturing biofilms[13] or in tumors or gut microbiota.[14]

In non-anerobic microbiology

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Building on their small size and reversibility, hence limited impact on protein function and interactions, FAST and splitFAST have been used in fungi, namely Saccharomyces cerevisiae, to monitor metabolic engineering,[15] and in pathological bacteria, namely Listeria monocytogenes, to explore their bacterial virulence factors.[16]

In mammalian cells

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Beyond microorganisms, FAST and splitFAST have started wide spreading across mechanism studies in mammalian cells. They helped elucidate the role of a special GPCR in dendritic spine maturation[17] as well as a mechanism of action of the interferon-inducible MX1 protein against Influenza A.[18] splitFAST has been used in studies of membrane contact sites (MCSs) between membranous organelles, a raising area in medical research, e.g., for the endoplasmic reticulum-mitochondria junction.[19] Also, splitFAST-equipped lipid droplets have been designed to enable lipid droplets interactions studies.[20]

References

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  1. ^ Plamont, Marie-Aude; Billon-Denis, Emmanuelle; Maurin, Sylvie; Gauron, Carole; Pimenta, Frederico M.; Specht, Christian G.; Shi, Jian; Quérard, Jérôme; Pan, Buyan; Rossignol, Julien; Moncoq, Karine (2015-12-28). "Small fluorescence-activating and absorption-shifting tag for tunable protein imaging in vivo". Proceedings of the National Academy of Sciences. 113 (3): 497–502. doi:10.1073/pnas.1513094113. ISSN 0027-8424. PMC 4725535. PMID 26711992.
  2. ^ Gautier, Arnaud; Tebo, Alison G. (2018). "Fluorogenic Protein-Based Strategies for Detection, Actuation, and Sensing". BioEssays. 40 (10): e1800118. doi:10.1002/bies.201800118. ISSN 0265-9247. PMID 30152860.
  3. ^ Gautier, Arnaud (2022). "Fluorescence-Activating and Absorption-Shifting Tags for Advanced Imaging and Biosensing". Accounts of Chemical Research. 55 (21): 3125–3135. doi:10.1021/acs.accounts.2c00098. ISSN 0001-4842.
  4. ^ Reja, Shahi Imam; Minoshima, Masafumi; Hori, Yuichiro; Kikuchi, Kazuya (2021). "Near-infrared fluorescent probes: a next-generation tool for protein-labeling applications". Chemical Science. 12 (10): 3437–3447. doi:10.1039/d0sc04792a. ISSN 2041-6520. PMC 8179524. PMID 34163617.
  5. ^ Tebo, Alison G.; Gautier, Arnaud (2019-08-14). "Author Correction: A split fluorescent reporter with rapid and reversible complementation". Nature Communications. 10 (1): 3730. Bibcode:2019NatCo..10.3730T. doi:10.1038/s41467-019-11689-6. ISSN 2041-1723. PMC 6694131. PMID 31413330.
  6. ^ Bottone, Sara; Broch, Fanny; Brion, Aurélien; Hajji, Lina El; Benaissa, Hela; Gautier, Arnaud (2023), A tripartite chemogenetic fluorescent reporter for imaging ternary protein interactions, doi:10.1101/2023.10.19.563144, retrieved 2024-06-17
  7. ^ Bottone, Sara; Joliot, Octave; Cakil, Zeyneb Vildan; El Hajji, Lina; Rakotoarison, Louise-Marie; Boncompain, Gaelle; Perez, Franck; Gautier, Arnaud (2023). "A fluorogenic chemically induced dimerization technology for controlling, imaging and sensing protein proximity". Nature Methods. 20 (10): 1553–1562. doi:10.1038/s41592-023-01988-8. ISSN 1548-7105. PMID 37640938.
  8. ^ Venkatachalapathy, Muthukumaran; Belapurkar, Vivek; Jose, Mini; Gautier, Arnaud; Nair, Deepak (2019). "Live cell super resolution imaging by radial fluctuations using fluorogen binding tags". Nanoscale. 11 (8): 3626–3632. doi:10.1039/c8nr07809b. ISSN 2040-3364. PMID 30734810. S2CID 73450884.
  9. ^ Streett, Hannah; Charubin, Kamil; Papoutsakis, Eleftherios Terry (October 2021). "Anaerobic fluorescent reporters for cell identification, microbial cell biology and high-throughput screening of microbiota and genomic libraries". Current Opinion in Biotechnology. 71: 151–163. doi:10.1016/j.copbio.2021.07.005. ISSN 0958-1669. PMID 34375813.
  10. ^ Myers, Tyler; Dykstra, Christy M. (2024-06-10). "Teaching old dogs new tricks: genetic engineering methanogens". Applied and Environmental Microbiology: e0224723. doi:10.1128/aem.02247-23. ISSN 0099-2240. PMC 11267900. PMID 38856201.
  11. ^ Anjou, Cyril; Lotoux, Aurélie; Zhukova, Anna; Royer, Marie; Caulat, Léo C.; Capuzzo, Elena; Morvan, Claire; Martin-Verstraete, Isabelle (2024). "The multiplicity of thioredoxin systems meets the specific lifestyles of Clostridia". PLOS Pathogens. 20 (2): e1012001. doi:10.1371/journal.ppat.1012001. ISSN 1553-7374. PMC 10880999. PMID 38330058.
  12. ^ Tůmová, Pavla; Voleman, Luboš; Klingl, Andreas; Nohýnková, Eva; Wanner, Gerhard; Doležal, Pavel (2021). "Inheritance of the reduced mitochondria of Giardia intestinalis is coupled to the flagellar maturation cycle". BMC Biology. 19 (1): 193. doi:10.1186/s12915-021-01129-7. ISSN 1741-7007. PMC 8422661. PMID 34493257.
  13. ^ Almatroudi, Ahmad (2024-03-29). "Investigating Biofilms: Advanced Methods for Comprehending Microbial Behavior and Antibiotic Resistance". Frontiers in Bioscience-Landmark. 29 (4): 133. doi:10.31083/j.fbl2904133. ISSN 2768-6701. PMID 38682189.
  14. ^ Cao, Zhenping; Wang, Lu; Liu, Rui; Lin, Sisi; Wu, Feng; Liu, Jinyao (2022). "Encoding with a fluorescence-activating and absorption-shifting tag generates living bacterial probes for mammalian microbiota imaging". Materials Today Bio. 15: 100311. doi:10.1016/j.mtbio.2022.100311. ISSN 2590-0064. PMC 9194656. PMID 35711290.
  15. ^ Van Genechten, Wouter; Van Dijck, Patrick; Demuyser, Liesbeth (2021-02-17). "Fluorescent toys 'n' tools lighting the way in fungal research". FEMS Microbiology Reviews. 45 (5). doi:10.1093/femsre/fuab013. ISSN 1574-6976. PMC 8498796. PMID 33595628.
  16. ^ Braet, Julie; Catteeuw, Dominiek; Van Damme, Petra (2022-01-24). "Recent Advancements in Tracking Bacterial Effector Protein Translocation". Microorganisms. 10 (2): 260. doi:10.3390/microorganisms10020260. ISSN 2076-2607. PMC 8876096. PMID 35208715.
  17. ^ Verpoort, Ben; Amado, Luísa; Vandensteen, Jeroen; Leysen, Elke; Dascenco, Dan; Vandenbempt, Joris; Lemmens, Irma; Wauman, Joris; Vennekens, Kristel (2024-05-08), Cell-surface receptor-mediated regulation of synaptic organelle distribution controls dendritic spine maturation, doi:10.1101/2024.05.08.592949, retrieved 2024-06-16
  18. ^ McKellar, Joe; García De Gracia, Francisco; Aubé, Corentin; Chaves Valadão, Ana Luiza; Tauziet, Marine; Arnaud-Arnould, Mary; Rebendenne, Antoine; Neyret, Aymeric; Labaronne, Emmanuel (2024-02-22), Human MX1 orchestrates the cytoplasmic sequestration of neo-synthesized influenza A virus vRNPs, doi:10.1101/2024.02.22.581565, retrieved 2024-06-16
  19. ^ Casas, Paloma García; Rossini, Michela; Påvénius, Linnea; Saeed, Mezida; Arnst, Nikita; Sonda, Sonia; Bruzzone, Matteo; Berno, Valeria; Raimondi, Andrea (2023-12-28), Simultaneous detection of membrane contact dynamics and associated Ca2+ signals by reversible chemogenetic reporters, doi:10.1101/2023.12.28.573515, hdl:11577/3506675, retrieved 2024-06-16
  20. ^ Li, Xiao; Gamuyao, Rico; Wu, Ming-Lun; Cho, Woo Jung; Kurtz, Nathan B.; King, Sharon V.; Petersen, R. A.; Stabley, Daniel R.; Lindow, Caleb (2023-11-29), "A fluorogenic complementation tool kit for interrogating lipid droplet-organelle interaction", bioRxiv: The Preprint Server for Biology, doi:10.1101/2023.11.29.569289, PMC 10705429, PMID 38076863, retrieved 2024-06-16
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