Mutant luciferase of a firefly, mutant luciferase genes, recombinant DNAS containing the genes and a method of producing mutant luciferase
First Claim
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1. A mutant luciferase gene encoding the amino acid sequence of luciferase of Luciola cruciata, in which one of the following changes appears:
- serine is replaced by asparagine at amino acid 286, glycine is replaced by serine at amino acid 326, histidine is replaced by tyrosine at amino acid 433 or proline is replaced by serine at amino acid 452.
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Abstract
The present invention provides industrially useful luciferase. Mutant luciferase of the invention is produced by culturing a microorganism belonging to the genus Escherichia which harbors a recombinant DNA containing the mutant luciferase gene of a firefly. Mutant luciferase can produce red, orange or green color of light which can not be produced by wild type luciferase. Mutant luciferase can be used to measure ATP accurately in a colored solution such as red (e.g., blood), orange, or green in which wild-type luciferase has not provided reliable results.
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15 Claims
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1. A mutant luciferase gene encoding the amino acid sequence of luciferase of Luciola cruciata, in which one of the following changes appears:
- serine is replaced by asparagine at amino acid 286, glycine is replaced by serine at amino acid 326, histidine is replaced by tyrosine at amino acid 433 or proline is replaced by serine at amino acid 452.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of producing a mutant firefly luciferase, which comprises culturing, in a culture medium, a microorganism belonging to the genus Escherichia transformed with a recombinant DNA containing a mutant gene encoding the amino acid sequence of luciferase of Luciola criciata, in which one of the following changes appears:
- serine is replaced by asparagine at amino acid 286, glycine is replaced by serine at amino acid 326, histidine is replaced by tyrosine at amino acid 433 or proline is erplaced by serine at amino acid 452, and recovering the mutant luciferase from the culture.
- View Dependent Claims (12, 13, 14, 15)
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