oxyluciferin

ox·y·lu·cif·er·in

(ok'sē-lū-sif'ĕr-in),
The activated derivative of luciferin formed in bioluminescence.
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FFL(Firefly luciferase) catalyzes the oxidation of luciferin in the presence of ATP, Mg2+ and molecular oxygen to produce light, oxyluciferin, CO2 and AMP [1].
ATP also happens to be a key energy source in the enzymatic luciferase reaction, where the substrate luciferin is converted to oxyluciferin plus emission of a photon.
Through a sequence of another 2 reactions, the released pyrophosphate is converted into adenosine triphosphate (ATP), a cofactor for the enzyme luciferase, oxidizing luciferin to oxyluciferin and light.
2+], catalyzes the oxidation of luciferin by molecular oxygen, yielding the excited state of oxyluciferin (2-4).