Methods for measuring phosphatase activity

Details Methods for measuring phosphatase activity Methods for measuring phosphatase activity

2007-04-10

2007-04-10

Gitomer, Ralph (Department: 1657)

Chemistry: molecular biology and microbiology

Measuring or testing process involving enzymes or...

Involving hydrolase

C530S323000

Reexamination Certificate

active

11100068

ABSTRACT:
A method for determining the level of kinase activity or phosphatase activity in a sample without the use of antibodies or radioactive labels is disclosed. The method employs a fluorescently-labeled phosphorylatable reporter peptide that is capable of being cleaved by a protease only when the peptide is in an unphosphorylated state. A change in fluorescence characteristics is an indication that the peptide is cleaved and, therefore, in an unphosphorylated state. Thus, the level of protease cleavage, as measured by the fluorescence change, provides a direct measure of phosphatase activity whereas the level of kinase activity is inversely proportion to the level of protease cleavage. The method is particularly well suited to high throughput screening, for example, for screening compounds which modulate kinase or phosphatase activity.

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