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Development and validation of a fluorogenic assay to measure separase enzyme activity
Dipanjan Basu1, Nenggang Zhang, Anil K Panigrahi
1Department of Pediatric Hematology/Oncology, Texas Children's Cancer Center, Baylor College of Medicine, Houston, TX 77030, USA.
Analytical Biochemistry
|June 6, 2009
Summary
Researchers developed a new assay to measure separase enzyme activity, crucial for cell division and implicated in cancer. This tool helps quantify separase in various cancer types and patient samples.
Area of Science:
- Molecular Biology
- Biochemistry
- Cancer Research
Background:
- Separase is an endopeptidase essential for sister chromatid separation during anaphase.
- Separase acts as an oncogene, with its overexpression linked to aneuploidy and mammary tumorigenesis in mice.
- Elevated separase levels and mislocalization are observed in various human cancers, including breast, prostate, and osteosarcoma.
Purpose of the Study:
- To develop a quantitative assay for measuring separase enzymatic activity.
- To assess separase activity during cell cycle progression.
- To analyze separase activity in human tumor cell lines and leukemia patient samples.
Main Methods:
- A fluorogenic assay was designed using a 7-amido-4-methyl coumaric acid (AMC)-conjugated Rad21 peptide substrate.
- The substrate mimics the Rad21 mitotic cleavage site targeted by separase.
- Separase activity was quantified using this assay in cell cycle studies, tumor cell lines, and patient samples.
Main Results:
- The developed fluorogenic assay successfully quantifies separase enzymatic activity.
- Separase activity was measured throughout the cell cycle.
- The assay was applied to analyze separase activity in diverse human cancer cell lines and leukemia patient samples.
Conclusions:
- A novel quantitative fluorogenic assay for separase enzymatic activity has been established.
- This assay provides a tool to investigate the role of separase in cancer biology.
- The assay's application to clinical samples offers potential for diagnostic and prognostic insights.
