Compositions for the detection of enzyme activity in biological samples and methods of use thereof
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United States of America Patent
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Dec 25, 2007
Grant Date -
May 20, 2004
app pub date -
Jun 4, 2001
filing date -
Feb 20, 1997
priority date (Note) -
Expired
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Abstract
The present invention provides for novel reagents whose fluorescence increases in the presence of particular proteases. The reagents comprise a characteristically folded peptide backbone conjugated to two fluorophores such that the fluorophores are located opposite sides of a cleavage site. When the folded peptide is cleaved, as by digestion with a protease, the fluorophores provide a high intensity fluorescent signal at a visible wavelength. Because of their high specificity and their high fluorescence signal in the visible wavelengths, these protease indicators are particularly well suited for detection of protease activity in biological samples, in particular in frozen tissue sections. Thus this invention also provides for methods of detecting protease activity in situ in frozen sections.
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