Fluorescence-based Monitoring of PAD4 Activity via a Pro-fluorescence Substrate Analog

Overview

This study presents a high-throughput fluorescence-based assay for PAD4, an enzyme that converts peptidyl-arginine to peptidyl-citrulline. The assay aims to provide quantitative information on PAD4 activity, which is relevant due to its dysregulation in various diseases.

Key Study Components

Area of Science

• Neuroscience
• Biochemistry
• Enzyme assays

Background

• PAD4 is involved in the conversion of arginine to citrulline.
• Dysregulation of PAD4 is linked to several human diseases.
• Existing assays may not provide sufficient sensitivity or throughput.
• This study introduces a fluorescence-based method to improve detection.

Purpose of Study

• To develop a reproducible assay for measuring PAD4 activity.
• To utilize fluorescence for monitoring substrate modification.
• To compare this method with traditional techniques.

Methods Used

• Incubation of PAD4 with substrate analog ZR Co.
• Incubation at room temperature or 37 degrees Celsius.
• Addition of trypsin to generate fluorescent signals.
• Measurement of fluorescence to assess substrate modification.

Main Results

• Active PAD4 leads to a covalent change in the substrate.
• Fluorescent signals decrease with the addition of active PAD4.
• The assay effectively differentiates between modified and unmodified substrates.
• This method offers advantages over ammonia release assays.

Conclusions

• The fluorescence-based assay is a reliable method for PAD4 activity measurement.
• This technique can enhance understanding of PAD4's role in diseases.
• Future applications may include high-throughput screening of PAD4 inhibitors.

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