There can be a small distribution of something. |
Today feels different for some reason. But as of yet, absolutely nothing out of the ordinary has happened. |
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The luminescence of the dinoflagellate Pyrocystis lunula is controlled by the reduction state of the luciferin precursor. This molecule (P630) is a chromopeptide more stable than luciferin in methanolic solutions at low temperature. Cations may oxidize P630 or cleave the bond between the peptidic chain and the extended tetrapyrrole. Reduction of P630 is performed enzymatically by a NAD(P)H-dependent oxidoreductase or chemically by 2-mercaptoethanol or dithiothreitol. The state of reduction is monitored by the absorption and fluorescence emission which reveal a conformational change of the chromopeptide depending on the pH. |
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