Target-Activated DNA Polymerase Activity for Sensitive RNase H Activity Assay

Area of Science:

• Biochemistry
• Molecular Biology
• Enzyme Assays

Background:

• Ribonuclease H (RNase H) is a crucial enzyme with therapeutic relevance, particularly for treating acquired immune deficiency syndrome (AIDS).
• Accurate and sensitive methods for quantifying RNase H activity and screening its inhibitors are essential for drug development.

Purpose of the Study:

• To develop a novel, highly sensitive assay for detecting ribonuclease H (RNase H) activity.
• To establish a platform for evaluating the efficacy of potential RNase H inhibitors as therapeutic agents.

Main Methods:

• A detection probe was designed with DNA polymerase binding sites and RNase H catalytic substrates.
• RNase H activity destabilizes the probe, releasing the DNA polymerase to initiate signal amplification via TaqMan probes.
• The assay utilizes a fluorescence "turn-on" signal transduction module for quantitative detection.

Main Results:

• The assay demonstrated high sensitivity, detecting RNase H activity as low as 0.016 U/mL under optimized conditions.
• The method successfully evaluated the potential of RNase H inhibitors, relevant for AIDS therapy.
• The assay provides a "turn-on" fluorescence signal proportional to RNase H activity.

Conclusions:

• This novel assay offers a sensitive and accurate approach for determining RNase H enzyme activity.
• The developed method is promising for high-throughput screening of RNase H inhibitors for therapeutic applications.
• The target-activated DNA polymerase activity-based assay provides a robust platform for biochemical research and drug discovery.