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Ratiometric Zinc Biosensor Based on Bioluminescence Resonance Energy Transfer: Trace Metal Ion Determination with Tunable Response. Int J Mol Sci 2022; 23:ijms232314936. [PMID: 36499262 PMCID: PMC9738544 DOI: 10.3390/ijms232314936] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2022] [Revised: 11/18/2022] [Accepted: 11/23/2022] [Indexed: 12/03/2022] Open
Abstract
Determination of metal ions such as zinc in solution remains an important task in analytical and biological chemistry. We describe a novel zinc ion biosensing approach using a carbonic anhydrase-Oplophorus luciferase fusion protein that employs bioluminescence resonance energy transfer (BRET) to transduce the level of free zinc as a ratio of emission intensities in the blue and orange portions of the spectrum. In addition to high sensitivity (below nanomolar levels) and selectivity, this approach allows both quantitative determination of "free" zinc ion (also termed "mobile" or "labile") using bioluminescence ratios and determination of the presence of the ion above a threshold simply by the change in color of bioluminescence, without an instrument. The carbonic anhydrase metal ion sensing platform offers well-established flexibility in sensitivity, selectivity, and response kinetics. Finally, bioluminescence labeling has proven an effective approach for molecular imaging in vivo since no exciting light is required; the expressible nature of this sensor offers the prospect of imaging zinc fluxes in vivo.
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Preiss J, Kage D, Hoffmann K, Martínez TJ, Resch-Genger U, Presselt M. Ab Initio Prediction of Fluorescence Lifetimes Involving Solvent Environments by Means of COSMO and Vibrational Broadening. J Phys Chem A 2018; 122:9813-9820. [PMID: 30507127 DOI: 10.1021/acs.jpca.8b08886] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The fluorescence lifetime is a key property of fluorophores that can be utilized for microenvironment probing, analyte sensing, and multiplexing as well as barcoding applications. For the rational design of lifetime probes and barcodes, theoretical methods have been developed to enable the ab initio prediction of this parameter, which depends strongly on interactions with solvent molecules and other chemical species in the emitteŕs immediate environment. In this work, we investigate how a conductor-like screening model (COSMO) can account for variations in fluorescence lifetimes that are caused by such fluorophore-solvent interactions. Therefore, we calculate vibrationally broadened fluorescence spectra using the nuclear ensemble method to obtain distorted molecular geometries to sample the electronic transitions with time-dependent density functional theory (TDDFT). The influence of the solvent on fluorescence lifetimes is accounted for with COSMO. For example, for 4-hydroxythiazole fluorophore containing different heteroatoms and acidic and basic moieties in aprotic and protic solvents of varying polarity, this approach was compared to experimentally determined lifetimes in the same solvents. Our results demonstrate a good correlation between theoretically predicted and experimentally measured fluorescence lifetimes except for the polar solvents ethanol and acetonitrile that can specifically interact with the heteroatoms and the carboxylic acid of the thiazole derivative.
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Affiliation(s)
- Julia Preiss
- Institute of Physical Chemistry , Friedrich Schiller University Jena , Helmholtzweg 4 , 07743 Jena , Germany.,Leibniz Institute of Photonic Technology (IPHT) , Albert-Einstein-Strasse 9 , 07745 Jena , Germany
| | - Daniel Kage
- Bundesanstalt für Materialforschung und-prüfung (BAM), Richard-Willstätter-Strasse 11 , 12489 Berlin , Germany.,Department of Physics , Humboldt-Universität zu Berlin , Newtonstrasse 15 , 12489 Berlin , Germany
| | - Katrin Hoffmann
- Bundesanstalt für Materialforschung und-prüfung (BAM), Richard-Willstätter-Strasse 11 , 12489 Berlin , Germany
| | - Todd J Martínez
- SLAC National Accelerator Laboratory , Menlo Park , California 94309 , United States.,Department of Chemistry and PULSE Institute , Stanford University , Stanford , California 94305 , United States
| | - Ute Resch-Genger
- Bundesanstalt für Materialforschung und-prüfung (BAM), Richard-Willstätter-Strasse 11 , 12489 Berlin , Germany
| | - Martin Presselt
- Institute of Physical Chemistry , Friedrich Schiller University Jena , Helmholtzweg 4 , 07743 Jena , Germany.,Leibniz Institute of Photonic Technology (IPHT) , Albert-Einstein-Strasse 9 , 07745 Jena , Germany.,Center for Energy and Environmental Chemistry Jena (CEEC Jena) , Friedrich Schiller University Jena , Philosophenweg 7a , 07743 Jena , Germany.,Sciclus GmbH & Co. KG, Moritz-von-Rohr-Strasse 1a , 07745 Jena , Germany
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