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Dinoflagellate bioluminescence: a comparative study of invitro components
Journal of Cellular Physiology
|January 1, 1976
Summary
Bioluminescence in four dinoflagellate species shows similarities, with cross-reacting luciferases and luciferins. However, differences in luciferase chain weight and the presence of a luciferin binding protein (LBP) suggest distinct biochemical pathways.
Area of Science:
- Marine Biology
- Biochemistry
- Molecular Biology
Background:
- Dinoflagellates are marine plankton known for their bioluminescent capabilities.
- Bioluminescence involves the enzyme luciferase acting on the substrate luciferin.
- Understanding the biochemical components of bioluminescence is key to studying marine ecosystems.
Purpose of the Study:
- To investigate and compare the in vitro bioluminescence components of four dinoflagellate species: Gonyaulax polyedra, G. tamarensis, Dissodinium lunual, and Pyrocystis noctiluca.
- To identify similarities and differences in their luciferase, luciferin, and associated proteins.
- To explore variations in enzyme activity and extractability.
Main Methods:
- In vitro biochemical assays were performed on extracts from the four dinoflagellate species.
- Luciferase and luciferin cross-reactivity was tested.
- Molecular weights of enzymes and proteins were determined.
- Luciferase activity was measured across different times of day.
- The presence of luciferin binding protein (LBP) was assessed.
Main Results:
- Luciferases and luciferins from all four species exhibited cross-reactivity.
- High-molecular weight luciferases (200,000–400,000 daltons) were found in all species.
- Gonyaulax species had luciferase single chains of 130,000 MW, while P. noctiluca and D. lunula had 60,000 MW chains.
- Luciferase activity varied daily in Gonyaulax but not the others.
- Luciferin binding protein (LBP) was extractable from Gonyaulax but not from D. lunula or P. noctiluca.
Conclusions:
- The biochemistry of bioluminescence in these dinoflagellates is largely conserved, particularly regarding luciferase and luciferin interactions.
- Significant differences exist in luciferase subunit composition and the apparent absence of LBP in D. lunula and P. noctiluca.
- These distinctions suggest potential variations in the regulation and molecular mechanisms of bioluminescence among these dinoflagellate species, warranting further investigation.