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No evidence for non-resonant optical frequency-induced effects on the intrinsic fluorescence of adenosine-5′-triphosphate and the kinetics of the firefly luciferin–luciferase reaction

Paper ID Volume ID Publish Year Pages File Format Full-Text
27246 44012 2011 9 PDF Available
Title
No evidence for non-resonant optical frequency-induced effects on the intrinsic fluorescence of adenosine-5′-triphosphate and the kinetics of the firefly luciferin–luciferase reaction
Abstract

A paper by Amat et al. [2] reported that the ATP-driven oxidation of luciferin to electronically excited oxyluciferin catalyzed by luciferase was accelerated when ATP was priorly irradiated at non-resonant optical frequencies (NROF) at 635 and 830 nm. In another paper by Amat et al. [3], increased fluorescence intensities of ATP–Mg complexes, which showed lower fluorescence than ATP when excited at 260 nm, were reported in consequence of concomitant NROF irradiation (i.e., 655 and 830 nm). It was postulated that NROF-induced electric field changes may alter the charge distribution in ATP's phosphate chain, resulting in lowering of the activation energy of its terminal phosphate. Here we use spectrofluorometry to further investigate this hypothesis. The effect of NROF (at 632.8 nm) on the intrinsic fluorescence of non-complexed and Mg-chelated ATP in aqueous solution and the influence of NROF (514.5 nm and 632.8 nm) on the rate of the luciferin–luciferase reaction was studied. We found that neither the intrinsic fluorescence of ATP nor its biochemical behavior during the firefly luciferin–luciferase reaction was affected by laser irradiation with NROF. Consequently, no evidence was found supporting the postulation that NROF-induced alternations on the charge distribution of the phosphate chain affect the reactivity of ATP.

► Luciferin–luciferase kinetics show no evidence for effects of non-resonant irradiation. ► ATP fluorescence in the presence and absence of Mg2+ at different pH is unaffected by 633-nm irradiation at high powers. ► No evidence for modification of ATP by non-resonant laser light.

Keywords
Ar ion, argon ion; ADP, adenosine-5′-diphosphate; AMP, adenosine-5′-monophosphate; ATP, adenosine-5′-triphosphate; DTT, dithiothreitol; EDTA, ethylenediaminetetraacetic acid; HeNe, helium neon; NROF, non-resonant optical frequenciesLuciferin–luciferase bi
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No evidence for non-resonant optical frequency-induced effects on the intrinsic fluorescence of adenosine-5′-triphosphate and the kinetics of the firefly luciferin–luciferase reaction
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 223, Issues 2–3, 25 September 2011, Pages 88–96
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
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Online Support
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