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Ls55 fluorescence

Manufactured by PerkinElmer

The LS55 Fluorescence is a laboratory instrument designed for fluorescence analysis. It is capable of measuring the fluorescence properties of samples, including emission spectra and intensity. The LS55 provides accurate and reliable data for a variety of applications in fields such as biochemistry, molecular biology, and material science.

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2 protocols using ls55 fluorescence

1

Spectroscopic and Molecular Docking Analysis

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UV-vis absorption spectra were recorded on a Shimadzu UV-vis1800 (Japan). The wavelength range, 200–600 nm, was used for data collection. All fluorescence spectra were recorded on Perkin Elmer LS55 Fluorescence (U.S.A.) spectrophotometer. The excitation wavelength was set at 280 nm and emission data was collected between 300 and 500 nm. Excitation and emission slit widths were kept at 10.0 nm. Molecular docking was carried out using Autodock Vina (Maltas and Ozmen, 2015 (link)).
Two milliliters of individual reactions were set up for UV-Vis data collection. Fluorescence data was collected by successively titrating dye stock solution manually, and mixing the reaction by pipetting.
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2

Trp Fluorescence Assay for Intein Proteins

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We measured native Trp fluorescence using a Perkin Elmer LS55 fluorescence spectrometer, with a constant temperature of 25°C maintained by a Peltier control system. An excitation wavelength of 295 nm was used to excite only the Trp residues in the intein rather than Tyr residues.48 (link) Emission was monitored from 310 nm to 380 nm at a scan rate of 10 nm/min, with 2.5 nm slit widths for excitation and emission on a medium gain setting. Protein Gb1A was measured at 10 μM and protein Gb1D was measured at 8 μM in 20 mM HEPES, pH 7.5, at varying concentrations of NaCl.
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