A novel selective Nav1.7 channel blocker (IC50 = 2.5 nM). ProTx-III also inhibits Nav1.1, Nav1.2 and Nav1.6 at nanomolar concentrations and does not affects Cav channels and nicotinic acetylcholine receptors.
CAT No: R0972
ProTx III is a synthetic peptide toxin originally isolated from the venom of the tarantula Thrixopelma pruriens, recognized for its potent and selective modulation of voltage-gated sodium channels (Nav). As a disulfide-rich peptide, it belongs to the inhibitory cystine knot (ICK) family, exhibiting a compact and stable structure that enables high affinity and specificity for particular Nav channel subtypes, notably Nav1.7. Its ability to modulate neuronal excitability has made it an invaluable molecular tool in neurophysiology and ion channel research. ProTx III's unique pharmacological profile provides researchers with a precise means to dissect sodium channel function, investigate structure-activity relationships, and explore the molecular underpinnings of excitability in excitable tissues.
Ion Channel Pharmacology: In the field of ion channel research, ProTx III is widely used to selectively inhibit Nav1.7 and related sodium channel isoforms. Its high specificity enables detailed studies of channel gating mechanisms, subunit interactions, and the physiological roles of Nav channels in neuronal and non-neuronal tissues. By providing reversible and subtype-preferential inhibition, the peptide supports the characterization of sodium channel pharmacology, facilitating the identification of channel modulators and advancing the understanding of electrical signaling in health and disease models.
Neurophysiological Studies: Researchers employ ProTx III as a molecular probe to investigate the dynamics of neuronal excitability and signal propagation. Its ability to modulate action potential generation and propagation in neurons allows for precise mapping of sodium channel contributions to neural circuit function. The peptide is instrumental in elucidating the biophysical properties of ion channels in sensory neurons, central nervous system preparations, and peripheral nerve models, offering insights into the fundamental processes of excitatory neurotransmission.
Structure-Activity Relationship Analysis: The defined sequence and three-dimensional conformation of ProTx III make it an excellent scaffold for structure-activity relationship (SAR) studies. Through site-directed mutagenesis or chemical modification, researchers can probe the molecular determinants of peptide-channel interactions, identify key residues responsible for binding affinity and selectivity, and design novel analogs with tailored pharmacological profiles. These SAR investigations contribute to the rational development of new peptide-based ion channel modulators and enhance understanding of toxin-channel recognition principles.
Peptide Engineering and Synthetic Biology: The stable ICK motif of ProTx III is a model system for peptide engineering and synthetic biology applications. Its robust fold and resistance to proteolytic degradation make it a valuable template for designing engineered peptides with improved stability, bioavailability, or altered channel selectivity. Researchers leverage these properties to create molecular tools for basic research or to develop new classes of ion channel modulators for preclinical studies, expanding the utility of venom-derived peptides in biotechnology.
Electrophysiological Assays: ProTx III is routinely used in patch-clamp and other electrophysiological assay systems to dissect the functional properties of sodium channels in heterologous expression systems, primary neurons, or tissue slices. By providing a reliable and selective means to inhibit specific Nav channel subtypes, the peptide supports high-resolution studies of channel kinetics, gating behavior, and pharmacological responses. Its application in these assays enables detailed functional characterization and screening of candidate modulators, supporting both basic research and early-stage drug discovery efforts in the ion channel field.
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