Crossreactivity between the light-emitting systems of distantly related organisms: Novel type of light-emitting compound

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Abstract
Dinoflagellate [Pyrocystis lunula and Gonyaulax polyedra] luciferin crossreacted and emitted light with euphausid [Meganyctiphanes] photoprotein; and euphausid fluorescent substance gives luminescence with dinoflagellate luciferase. Luciferin and the fluorescent substance, both highly unstable and fluorescent compounds, are biochemically similar but not identical. Preliminary spectral and chemical data suggest that both compounds contain an openchain polypyrrole structure, novel among compounds so far known to be involved in light emission in any biological system. The dinoflagellates and euphausids are phylogenetically distant; the possibility that the latter obtain the molecular nutritionally from the former is suggested.