Homo-doubly labeled compositions for the detection of enzyme activity in biological samples
First Claim
1. A fluorogenic composition comprising a nucleic acid backbone joining two fluorophores of the same species, wherein said nucleic acid backbone ranges in length from about 10 nucleotides to about 50 nucleotides, and whereby said fluorophores form an H-dimer resulting in quenching of the fluorescence of said fluorophores.
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Abstract
The present invention provides for novel reagents whose fluorescence changes upon cleavage or a change in conformation of a backbone. The reagents comprise a backbone (e.g. nucleic acid, polypeptide, etc.) joining two fluorophores of the same species whereby the fluorophores form an H-dimer resulting in quenching of the fluorescence of the fluorophores. When the backbone is cleaved or changes conformation, the fluorophores are separated, no longer forming an H-type dimer, and are de-quenched thereby providing a detectable signal. The use of a single fluorophore rather than an “acceptor-donor” fluoresecence resonance energy transfer system offers synthesis and performance advantages.
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35 Claims
- 1. A fluorogenic composition comprising a nucleic acid backbone joining two fluorophores of the same species, wherein said nucleic acid backbone ranges in length from about 10 nucleotides to about 50 nucleotides, and whereby said fluorophores form an H-dimer resulting in quenching of the fluorescence of said fluorophores.
- 20. A mammalian cell comprising a fluorogenic composition comprising a nucleic acid backbone joining two fluorophores of the same species, wherein said nucleic acid backbone ranges in length from about 10 nucleotides to about 50 nucleotides, and whereby said fluorophores form an H-dimer resulting in the quenching of the fluorescence of said fluorophores.
Specification