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Peptide-based Identification of Functional Motifs and their Binding Partners

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Published on: June 30, 2013

Identification, characterization, and structure-activity relationship of the ASIC3-selective peptide WRPRFa.

Chun Chien¹, Nien-Du Yang¹, Victoria Jiang¹

¹Latigo Biotherapeutics, Inc, Thousand Oaks, CA, USA.

Communications Chemistry

|December 12, 2025

Summary

Researchers identified WRPRFa as a potent activator of acid-sensing ion channel 3 (ASIC3). This peptide enhances ASIC3 activity and removes desensitization, offering a valuable tool for studying pain mechanisms.

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Peptide-based Identification of Functional Motifs and their Binding Partners

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Identifying Protein-protein Interaction Sites Using Peptide Arrays

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Published on: November 18, 2014

Area of Science:

Neuroscience
Molecular Biology
Pharmacology

Background:

Acid-sensing ion channels (ASICs) are crucial for detecting changes in proton concentration.
ASIC1a and ASIC3 are implicated in pain signaling during extracellular acidosis.
Selective modulators for ASIC3, like RFamide RPRFa, are limited and primarily slow desensitization.

Purpose of the Study:

To identify and characterize novel, potent activators of ASIC3.
To investigate the effects of a novel peptide, WRPRFa, on ASIC3 function.
To explore the potential of WRPRFa as a pharmacological tool for ASIC research.

Main Methods:

Electrophysiological recordings to assess ASIC3 channel activity.
pH-shift assays to determine channel activation and desensitization kinetics.
Application of the peptide WRPRFa to ASIC3-expressing cells.

Main Results:

WRPRFa was identified as the most potent ASIC3 activator discovered to date.
WRPRFa significantly enhanced ASIC3 pH sensitivity and abolished acute desensitization.
ASIC3 exhibits tachyphylaxis at very acidic pH, a process accelerated by WRPRFa.

Conclusions:

WRPRFa serves as a highly effective and selective pharmacological tool for in vitro studies of ASIC3.
The findings provide insights into the interaction between RFamides and ASICs.
This research advances the understanding of ASIC3 gating mechanisms and its role in physiological processes.