Bioluminescent Nanoluciferase-Furimamide Complex: A Theoretical Study on Different Protonation States

The Journal of Physical Chemistry. B
Mehdi SahihiIsabelle Navizet

Abstract

Luminescence of furimamide is 150 times brighter than oxidized luciferins in firefly and renilla luciferase. However, we do not have a clear understanding of the structure, function, and dynamic behavior of the nanoluciferase-furimamide complex. Here, for the first time, the absorption and emission properties of eight different possible light emitter forms of furimamide were investigated using the time-dependent density functional theory (TD-DFT) method in the gas phase and aqueous solution. The emission oscillator strengths in the gas phase showed that emission transition may be forbidden for some forms, and fluorescence would not occur. Besides, the charge transfer (CT) as well as the orbitals involved in the transitions were analyzed. Furthermore, molecular docking results showed that furimamide is situated inside the central cavity (β-barrel) of nanoluciferase. Analysis of the trajectory of molecular dynamics (MD) simulations suggested a less compact structure of protein in the presence of furimamide in comparison to its apo form. The quantum mechanical/molecular mechanical (QM/MM) spectroscopic properties of one form in the binding site of nanoluciferase were investigated. The evolution of the excited states (ESs) of furim...Continue Reading

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Citations

Jun 4, 2021·The Journal of Physical Chemistry. B·Jeffery B Klauda

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