ATP-Linked Chimeric Nucleotide as a Specific Luminescence Reporter of Deoxyuridine Triphosphatase

Area of Science:

• Biochemistry
• Molecular Biology
• Enzymology

Background:

• Nucleotide surveillance enzymes are vital for human health, preventing DNA damage from abnormal monomers.
• Deoxyuridine triphosphatase (dUTPase) is a key enzyme in nucleotide metabolism and a target for cancer therapy.
• Existing methods for measuring dUTPase activity lack specificity, detecting general pyrophosphate release.

Purpose of the Study:

• To develop a novel, enzyme-specific probe for accurate dUTPase activity measurement.
• To enable sensitive detection of dUTPase activity in vitro and in cell lysates.
• To quantify dUTPase activity across different human cell lines.

Main Methods:

• Design and synthesis of a dUTPase enzyme-specific chimeric dinucleotide (DUAL) probe.
• DUAL probe replaces the pyrophosphate leaving group with ATP for luciferase luminescence detection.
• Application of the DUAL probe to measure dUTPase activity in eight different cell lines.

Main Results:

• The DUAL probe demonstrates sensitive and selective quantification of dUTPase activity.
• First measurements of dUTPase activity reveal a 7-fold variation across eight cell lines.
• The probe effectively functions in both in vitro enzyme assays and cell lysate analyses.

Conclusions:

• The developed DUAL probe offers a significant advancement for studying dUTPase.
• This tool facilitates precise measurement of a clinically relevant enzyme.
• The findings provide a foundation for further research into dUTPase's role in cancer and other diseases.