FACS-optimized mutants of the green fluorescent protein (GFP)
First Claim
1. A nucleic acid comprising a sequence encoding a mutant Aequorea victoria green fluorescent protein brighter than a wild-type Aequorea victoria green fluorescent protein upon 488 nm excitation, wherein a set of mutation positions of said mutant protein comprises position 72.
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Abstract
Three classes of GFP mutants having single excitation maxima around 488 nm are brighter than lid-type GFP following 488 nm excitation. GFPmut1 has a double substitution: F64L, S65T; GFPmut2 has a triple substitution: S65A, V68L, S72A; and GFPmut3 is characterized by the double substitution S65G, S72A. The excitation maxima of the three mutants are at 488 nm, 481 nm and 501 nm respectively. The fluorescence intensities following excitation at 488 nm are an order of magnitude higher than that of wild-type GFP excited at 488 nm in E. coli. The expression of GFP is observable minutes after induction.
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Citations
50 Claims
- 1. A nucleic acid comprising a sequence encoding a mutant Aequorea victoria green fluorescent protein brighter than a wild-type Aequorea victoria green fluorescent protein upon 488 nm excitation, wherein a set of mutation positions of said mutant protein comprises position 72.
- 13. A host cell comprising a nucleic acid including a sequence encoding a mutant Aequorea victoria green fluorescent protein brighter than a wild-type Aequorea victoria green fluorescent protein upon 488 nm excitation, wherein a set of mutation positions of said mutant protein comprises position 72.
- 28. A nucleic acid comprising a sequence encoding a mutant Aequorea victoria green fluorescent protein brighter than a wild-type Aequorea victoria green fluorescent protein upon 488 nm excitation, wherein a set of mutations of said mutant protein comprises a F64L and a S65T mutation.
- 31. A host cell comprising a nucleic acid including a sequence encoding a mutant Aequorea victoria green fluorescent protein brighter than a wild-type Aequorea victoria green fluorescent protein upon 488 nm excitation, wherein a set of mutations of said mutant protein comprises a F64L and a S65T mutation.
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37. A method of analyzing a cell comprising the steps of:
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a) expressing a nucleic acid encoding a mutant green fluorescent protein, wherein a set of mutations of said mutant protein comprises a subset selected from a group consisting of a (F64L,S65T) subset, a (S65A,V68L,S72A) subset, and a (S65G, S72A) subset; and b) measuring a fluorescence signal from said mutant protein. - View Dependent Claims (38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50)
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Specification