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A fluorescence-based assay for the reductase activity of protein disulfide isomerase. 2006

Rossella Tomazzolli, and Mauro Dalla Serra, and Giuseppe Bellisola, and Marco Colombatti, and Graziano Guella
CNR-ITC, Institute of Biophysics, Unit at Trento, Povo, Italy.

We report on a new spectrofluorimetric assay for the measurement of reductase activity of proteins belonging to the superfamily of thioredoxins such as protein disulfide isomerase (PDI). The assay relies on the preparation of a fluorescence-quenched substrate easily accessible in two steps through functional group transformations of the peptide Gly-Cys-Asp. In the first step fluorescein isothiocyanate is linked to the Gly-NH(2) terminus and in the second step the Cys-SH groups are converted into a disulfide bond. Both intermediate and final substrate have been fully characterized by mass spectrometric and nuclear magnetic resonance measurements. Dimethyl sulfoxide is here reported to be a mild oxidizing agent allowing us to obtain in good overall yield the assay substrate in a single synthetic step. A reliable estimation of PDI reductase activity is obtained via the detection of a strong fluorescence enhancement after enzymatic reduction. Moreover, our assay provides further support for the key role played by thioredoxin reductase in enabling disulfide reductase activity of PDI.

UI MeSH Term Description Entries
D009842 Oligopeptides Peptides composed of between two and twelve amino acids. Oligopeptide
D010084 Oxidation-Reduction A chemical reaction in which an electron is transferred from one molecule to another. The electron-donating molecule is the reducing agent or reductant; the electron-accepting molecule is the oxidizing agent or oxidant. Reducing and oxidizing agents function as conjugate reductant-oxidant pairs or redox pairs (Lehninger, Principles of Biochemistry, 1982, p471). Redox,Oxidation Reduction
D010088 Oxidoreductases The class of all enzymes catalyzing oxidoreduction reactions. The substrate that is oxidized is regarded as a hydrogen donor. The systematic name is based on donor:acceptor oxidoreductase. The recommended name will be dehydrogenase, wherever this is possible; as an alternative, reductase can be used. Oxidase is only used in cases where O2 is the acceptor. (Enzyme Nomenclature, 1992, p9) Dehydrogenases,Oxidases,Oxidoreductase,Reductases,Dehydrogenase,Oxidase,Reductase
D005453 Fluorescence The property of emitting radiation while being irradiated. The radiation emitted is usually of longer wavelength than that incident or absorbed, e.g., a substance can be irradiated with invisible radiation and emit visible light. X-ray fluorescence is used in diagnosis.
D005456 Fluorescent Dyes Chemicals that emit light after excitation by light. The wave length of the emitted light is usually longer than that of the incident light. Fluorochromes are substances that cause fluorescence in other substances, i.e., dyes used to mark or label other compounds with fluorescent tags. Flourescent Agent,Fluorescent Dye,Fluorescent Probe,Fluorescent Probes,Fluorochrome,Fluorochromes,Fluorogenic Substrates,Fluorescence Agents,Fluorescent Agents,Fluorogenic Substrate,Agents, Fluorescence,Agents, Fluorescent,Dyes, Fluorescent,Probes, Fluorescent,Substrates, Fluorogenic
D013880 Thioredoxin-Disulfide Reductase A FLAVOPROTEIN enzyme that catalyzes the oxidation of THIOREDOXINS to thioredoxin disulfide in the presence of NADP+. It was formerly listed as EC 1.6.4.5 Thioredoxin Reductase (NADPH),NADP-Thioredoxin Reductase,NADPH-Thioredoxin Reductase,Thioredoxin Reductase,NADP Thioredoxin Reductase,NADPH Thioredoxin Reductase,Reductase, NADP-Thioredoxin,Reductase, NADPH-Thioredoxin,Reductase, Thioredoxin,Reductase, Thioredoxin-Disulfide,Thioredoxin Disulfide Reductase
D016650 Fluorescein-5-isothiocyanate Fluorescent probe capable of being conjugated to tissue and proteins. It is used as a label in fluorescent antibody staining procedures as well as protein- and amino acid-binding techniques. FITC,5-Isothiocyanatofluorescein,Fluorescein (5 or 6)-Isothiocyanate,Fluorescein-5-isothiocyanate Hydrochloride,5 Isothiocyanatofluorescein,Fluorescein 5 isothiocyanate,Fluorescein 5 isothiocyanate Hydrochloride,Hydrochloride, Fluorescein-5-isothiocyanate
D019704 Protein Disulfide-Isomerases Sulfur-sulfur bond isomerases that catalyze the rearrangement of disulfide bonds within proteins during folding. Specific protein disulfide-isomerase isoenzymes also occur as subunits of PROCOLLAGEN-PROLINE DIOXYGENASE. Protein Disulfide Isomerase,Protein Disulfide-Isomerase,Disulfide Interchange Enzyme,Disulfide Isomerase,Glycosylation Site-Binding Protein,Sulfhydryl-Disulfide Interchange Enzyme,Thiol-Disulfide Transhydrogenase,Trypanothione-Glutathione Thioltransferase,Disulfide Isomerase, Protein,Disulfide-Isomerase, Protein,Disulfide-Isomerases, Protein,Enzyme, Disulfide Interchange,Enzyme, Sulfhydryl-Disulfide Interchange,Glycosylation Site Binding Protein,Interchange Enzyme, Disulfide,Interchange Enzyme, Sulfhydryl-Disulfide,Isomerase, Disulfide,Isomerase, Protein Disulfide,Protein Disulfide Isomerases,Protein, Glycosylation Site-Binding,Site-Binding Protein, Glycosylation,Sulfhydryl Disulfide Interchange Enzyme,Thiol Disulfide Transhydrogenase,Thioltransferase, Trypanothione-Glutathione,Transhydrogenase, Thiol-Disulfide,Trypanothione Glutathione Thioltransferase
D019906 Nuclear Magnetic Resonance, Biomolecular NMR spectroscopy on small- to medium-size biological macromolecules. This is often used for structural investigation of proteins and nucleic acids, and often involves more than one isotope. Biomolecular Nuclear Magnetic Resonance,Heteronuclear Nuclear Magnetic Resonance,NMR Spectroscopy, Protein,NMR, Biomolecular,NMR, Heteronuclear,NMR, Multinuclear,Nuclear Magnetic Resonance, Heteronuclear,Protein NMR Spectroscopy,Biomolecular NMR,Heteronuclear NMR,Multinuclear NMR,NMR Spectroscopies, Protein,Protein NMR Spectroscopies,Spectroscopies, Protein NMR,Spectroscopy, Protein NMR
D021241 Spectrometry, Mass, Electrospray Ionization A mass spectrometry technique used for analysis of nonvolatile compounds such as proteins and macromolecules. The technique involves preparing electrically charged droplets from analyte molecules dissolved in solvent. The electrically charged droplets enter a vacuum chamber where the solvent is evaporated. Evaporation of solvent reduces the droplet size, thereby increasing the coulombic repulsion within the droplet. As the charged droplets get smaller, the excess charge within them causes them to disintegrate and release analyte molecules. The volatilized analyte molecules are then analyzed by mass spectrometry. ESI Mass Spectrometry,Electrospray Ionization Mass Spectrometry,Mass Spectrometry, ESI,Spectrometry, ESI Mass

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