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- W2058741661 abstract "Firefly luciferase is a monooxygenase that catalyzes the ATP-dependent conversion of firefly luciferin into a luciferyl-adenylate, which is oxidized to an electronically excited oxyluciferin in a multistep reaction and produces visible light with a remarkable quantum yield. The bioluminescence color of firefly luciferases is determined by the luciferase structure and assay conditions. Among different beetles, only luciferase from Phrixotrix railroad worm (PhRE) emits red bioluminescence, naturally. The presence of Arg353 in PhRE luciferase, which corresponds to the deleted residue in the other luciferases, is an important distinctive structural feature of it. Insertion of Arg356 into a green-emitter luciferase (Lampyris turkestanicus), corresponding to Arg353 in Phrixotrix hirtus, changed the emitted light from green to red. To further clarify the effect of this position on the light shift mechanism, four residues with similar sizes but different charges (Arg, Lys, Glu, and Gln) were inserted into Photinus pyralis luciferase, using site-specific insertion mutagenesis. Insertion of a residue with a positive side chain (Arg356 and Lys356) changed the light color to red, while insertion of a residue with a negative side chain (Glu356) had little effect on color. Insertion of a neutral residue (Gln356) at this position was performed without any change in bioluminescence spectra. Insertion of positively charged residues in this loop took place with a series of structural changes which were confirmed by fluorescence spectroscopy and homology modeling. Homology modeling reveals the appearance of a bulge in a flexible loop (T352−P359) upon mutation which shifts to the left side with a color change from green to red." @default.
- W2058741661 created "2016-06-24" @default.
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- W2058741661 date "2009-01-02" @default.
- W2058741661 modified "2023-10-16" @default.
- W2058741661 title "Effect of Charge Distribution in a Flexible Loop on the Bioluminescence Color of Firefly Luciferases" @default.
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- W2058741661 doi "https://doi.org/10.1021/bi802057w" @default.
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