Potent and selective Kv3.4 potassium channel blocker (IC50 = 47 nM). Also potent TTX-sensitive sodium channel agonist (EC50 = 3 nM). Exhibits neuroprotective effect.
BDS I, also known as Sea Anemone Toxin I or Anemonia sulcata toxin I, is a peptide toxin derived from the venom of the Mediterranean sea anemone. As a member of the sea anemone toxin family, BDS I is characterized by its unique disulfide-rich structure and potent bioactivity against specific ion channels, particularly voltage-gated potassium channels (Kv). Its high specificity and well-defined peptide sequence make it a valuable molecular tool in neurophysiological and ion channel research, providing insights into the structural and functional dynamics of membrane proteins. The compound's ability to modulate ion channel activity has positioned it as an essential reagent for dissecting neuronal signaling pathways and for advancing our understanding of excitable cell physiology.
Ion Channel Research: BDS I is extensively utilized in the investigation of voltage-gated potassium channels, especially Kv3 and Kv4 subtypes. By selectively inhibiting these channels, researchers can delineate their distinct physiological roles in neuronal excitability, cardiac repolarization, and signal transduction. The peptide's high affinity and subtype selectivity enable precise mapping of channel function, contributing to the development of detailed electrophysiological models and advancing the field of cellular neurobiology.
Neuroscience Studies: The toxin serves as a powerful probe in studies of synaptic transmission and neuronal firing patterns. Its ability to alter action potential dynamics by modulating potassium currents allows for controlled manipulation of neuronal output in both in vitro and ex vivo systems. Through these applications, BDS I aids in unraveling the molecular mechanisms underlying excitability disorders and supports the exploration of new targets for neurological research.
Pharmacological Screening: BDS I is employed as a reference inhibitor in high-throughput screening assays designed to identify novel modulators of Kv channels. Its well-characterized activity profile provides a benchmark for evaluating the efficacy and selectivity of new small molecules, peptides, or biologics. This application is particularly valuable in the early stages of drug discovery, where precise pharmacological tools are essential for target validation and lead optimization.
Peptide Structure-Activity Relationship (SAR) Analysis: The defined sequence and structural motifs of BDS I make it an exemplary scaffold for SAR studies. By introducing targeted modifications or synthesizing analogs, researchers can investigate the relationship between peptide structure and functional activity. These studies facilitate the rational design of new peptide-based modulators with tailored selectivity and potency, expanding the toolkit available for ion channel research and therapeutic exploration.
Electrophysiological Method Development: BDS I is frequently incorporated into protocols for patch-clamp and voltage-clamp experiments, serving as a standard modulator for validating assay systems. Its predictable and robust effects on potassium channel currents enhance the reliability and reproducibility of electrophysiological measurements. This contributes to methodological advancements in the study of membrane excitability, supporting both basic research and applied technology development in neurophysiology and pharmacology.
3. Autoinhibition and phosphorylation-induced activation of phospholipase C-γ isozymes
4. Store-operated Ca2+ entry sustains the fertilization Ca2+ signal in pig eggs
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