| Field | Specification |
|---|---|
| Mfr No | |
| Accession Number | |
| Activity | |
| Alternative Names | Kappa-scoloptoxin (15)-Ssd3a, Kappa-SLPTX(15)-Ssd3, Toxin SSD893, k- SLPTX(15)-Ssd3 |
| Concentration | |
| Form | Lyophilized |
| Formulation | |
| Gene ID | |
| Molecular Weight | |
| Product Type | |
| Purity | |
| Reconstitution | |
| Solubility | Centrifuge the vial before adding solvent (10,000 x g for 5 minutes) to spin down all the powder to the bottom of the vial. The lyophilized product may be difficult to visualize. Add solvent directly to the centrifuged vial. Tap the vial to aid in dissolving the lyophilized product. Tilt and gently roll the liquid over the walls of the vial. Avoid vigorous vortexing. Light vortexing for up to 3 seconds is acceptable if needed. The product is soluble in pure water at high micromolar concentrations (100 µM - 1 mM). For long-term storage in solution, we recommend preparing a stock solution by dissolving the product in double-distilled water (ddH2O) at a concentration between 100-1000x of the final working concentration. Divide the stock solution into small aliquots and store at -20°C. Before use, thaw the relevant vial(s) and dilute to the desired working concentration in your working buffer. Centrifuge all product preparations before use. It is recommended to prepare fresh solutions in working buffers just before use. Avoid multiple freeze-thaw cycles to maintain biological activity. |
| Source | Synthetic protein |
| Species | |
| Storage | |
| Target |
Overview
SsdTx3 is a research-grade protein/peptide reagent used in research settings. It is commonly applied as a tool reagent related to KATP inhibitor biology and/or assay development. It is supplied in Lyophilized format to support flexible downstream use in RUO workflows. Researchers commonly pair it with applications such as Electrophysiology.
Key elements and design rationale
- Molecular identity: MW: 6101 Da, Formula: C273H422N74O77S4.
- Source / origin: Scolopendra dehaani (Thai centipede) (Scolopendra subspinipes dehaani).
- Quality attributes: Purity: ≥98% (HPLC); Bioassay tested: Yes; Sterile / endotoxin-free: No.
Modifications
Disulfide bonds between: The exact location of the disulfide bridges is currently unknown.
When used as a biochemical or pharmacological tool, results are best interpreted relative to the experimental system (species, expression level, and assay readout) and with appropriate negative and competition-style controls where relevant. This product is intended for research use only.
Biological background
SsdTx3 (kappa-scoloptoxin(15)-Ssd3a) is a toxin isolated from the venom of the centipede Scolopendra subspinipes dehaani, a species that inhabits Asia. SsdTx3 was found to be an inhibitor of hKATP channels by blocking the hKir6.2 pore co-expressed with hSUR1. Dose-Response curve of the hKATP channels inhibition revealed that SsdTx3 inhibits hKATP channels with a Kd values of 278nM1.SsdTx belongs to a family of five proteins, discovered so far from a multiple centipede species, that target hKATP channel by blocking the hKir6.2 pore. They have conserved features of four cysteine residues and a P-P segment that contains positively charged residues important for blocking the K+ pore1.ATP-sensitive K+ ion channels (KATP channels) can be found in many different tissues such as pancreatic β-cells, carried myocytes, skeletal muscle, smooth muscle and brain. KATP channels are responsible for linking between the cell metabolism and the membrane potential and therefore they are critical for the regulation of different cellular pathways2.
Research relevance and current trends
- Using high-specificity ligands, toxins, and engineered peptides to dissect closely related receptor/channel subtypes and signaling microdomains.
- Pairing labeled (e.g., fluorescent) proteins/peptides with advanced imaging to map surface expression, trafficking, and nanoscale organization.
- Increasing emphasis on reproducibility through standardized characterization (identity, purity, and lot QC) and transparent reporting of reagent attributes.
Common research applications
- Electrophysiology: commonly used to compare signal, binding, or functional readouts across conditions without implying a specific protocol.
Across these use cases, changes in signal or functional readout are generally interpreted as evidence of differences in target abundance, accessibility, or engagement, but alternative explanations (matrix effects, off-target interactions, or assay artifacts) should be considered.
Notes for experimental interpretation
- Assay context matters: binding assays, functional modulation, and detection workflows can yield different readouts even for the same target system.
- Target complexity: closely related family members, splice variants, and post-translational modifications can influence apparent specificity and potency.
- Matrix and sample effects: buffer composition, detergents, and biological matrices may alter stability or apparent activity; interpret with appropriate controls.
- Control concepts: include negative controls and orthogonal validation (e.g., genetic perturbation or alternative reagents) to support robust interpretation.
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Peigneur, S.
et al. (2016) Biochemistry. 55, 2927.
Ramu, Y. and Lu, Z.
Nature Sci. Rep. (2019) 9, 14088.
Seino, S.
Annu. Rev. Physiol. (1999) 61, 337.
