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Cloning of the Blue Ghost ( Phausis reticulata ) Luciferase Reveals a Glowing Source of Green Light
Author(s) -
Branchini Bruce R.,
Southworth Tara L.,
Salituro Leah J.,
Fontaine Danielle M.,
Oba Yuichi
Publication year - 2016
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/php.12649
Subject(s) - luciferase , bioluminescence , luciferin , biology , open reading frame , luciferases , complementary dna , microbiology and biotechnology , cloning (programming) , genetics , gene , biochemistry , peptide sequence , transfection , computer science , programming language
In the southern Appalachian area of the United States, the Phausis reticulata firefly, commonly known as the “Blue Ghost,” performs a unique display of bioluminescence. Adult male organisms are observed darting rapidly along paths and riverbeds in dark forests producing long‐lasting and mesmerizing bluish‐white luminous streaks. Starting with eighteen adult male firefly lanterns, we used a reverse transcriptase and rapid amplification of cDNA ends ( RACE ) approach to clone the 1635 base pair open reading frame of the P. reticulata luc gene corresponding to a 545 residue protein. Expression of the recombinant luciferase protein in Escherichia coli and characterization studies revealed the true color of the light emission to be green ( λ max = 552 nm), strongly suggesting that the field observations result from a Purkinje shift. While the P. reticulata luciferase amino acid sequence is 74.3% identical to the North American Photinus pyralis luciferase, we were surprised to find that it was 88.4% and 87.7% identical to luciferases from C . ruficollis and D. axillaris both native to mainland Japan. Phylogenetic analysis confirmed the close relationship of the three enzymes that is surprising given the great distance between their natural habitats and the inability of the Japanese fireflies to produce bright bioluminescence.