5.00527

APETx2, Anthopleura elegantissima, Recombinant, E. coli

recombinant, expressed in E. coli

• Synonym(e): APETx2, Anthopleura elegantissima, Recombinant, E. coli, Acid-Sensing Ion Channel 3 Blocker, ASIC3 Channel Blocker
• Empirische Formel (Hill-System): C₁₉₆H₂₈₀N₅₄O₆₁S₆
• CAS-Nummer: 713544-47-9
• Molekulargewicht: 4561.04
• UNSPSC-Code: 12352200

Eigenschaften

• Rekombinant: expressed in E. coli
• Qualitätsniveau: 100
• Assay: ≥95% (HPLC)
• Form: lyophilized powder
• Wirksamkeit: 63 nM IC₅₀
• Hersteller/Markenname: Calbiochem^®
• Lagerbedingungen: OK to freeze; protect from light
• Löslichkeit: aqueous buffer: soluble
• Lagertemp.: −20°C

Beschreibung

Allgemeine Beschreibung

Originally isolated from sea anemone Anthopleura elegantissima, the 42 amino-acid toxin APETx2 is shown to block acidification-induced activation of homotrimeric acid-sensing ion channel composed of rat or human ASIC3 (IC₅₀ against pH 7.4 to 6 ramping-induced transient current = 63 nM and 175 nM by whole-cell patch-clamp using COS cells expressing respective channel), but not rat ASIC1a, ASIC1b, or ASIC2a, in a reversible manner, presumably via its N-terminus interaction with type I β turn that connects β-strands I&II in the ASIC3 extracellular β-ball region. In addition to acidification-induced classical transient current, APETx2 is also shown to inhibit the Na⁺-dependent, alkalization-induced nonconventional channel activity seen in human, but not rat, ASIC3 (complete inhibition by 1 µM APETx3; pH 8.0). APETx2 in vivo efficacy is demonstrated in various rat pain induction models, including acid- (via calf i.m. injection of 100 µL pH 4.0 saline on day 1&5) induced mechanical hypersensitivity (pain withdrawal threshold = 76% and 24% of control rats with or without 100 µL 2.2 µM APETx2 i.m. injection prior to the second pH 4.0 saline injection). Although structurally related to known K⁺ channel modulators APETx1 and BDS-1/II, APETx2 is reported to display much reduced potency against Kv3.4 (38% inhibition by 3 µM APETx2) and little or no effect toward hERG, Kv2.2, Kv3.1, Kv4.2, or Kv4.3 channel activity.

Originally isolated from sea anemone Anthopleura elegantissima, the 42 amino-acid toxin APETx2 is shown to block acidification-induced activation of homotrimeric acid-sensing ion channel composed of rat or human ASIC3, but not rat ASIC1a, ASIC1b, or ASIC2a, in a reversible manner. APETx2 is also shown to inhibit the Na⁺-dependent, alkalization-induced "nonconventional" channel activity seen in human, but not rat, ASIC3. APETx2 in vivo efficacy is demonstrated in various rat pain induction models (100 µL 2.2 µM APETx2 via i.m. injection). Reported to display much reduced potency against Kv3.4 and little or no effect toward hERG, Kv2.2, Kv3.1, Kv4.2, or Kv4.3 channel activity.

Biochem./physiol. Wirkung

Primary Target
ASIC3

Reversible: yes

Warnhinweis

Toxicity: Standard Handling (A)

Sequenz

H-Gly-Thr-Ala-Cys⁴-Ser-Cys⁶-Gly-Asn-Ser-Lys-Gly-Ile-Tyr-Trp-Phe-Tyr-Arg-Pro-Ser-Cys²⁰-Pro-Thr-Asp-Arg-Gly-Tyr-Thr-Gly-Ser-Cys³⁰-Arg-Tyr-Phe-Leu-Gly-Thr-Cys³⁷-Cys³⁸-Thr-Pro-Ala-Asp-OH (disulfide bonds: 4 → 37, 6 → 30, 20 → 38)

Physikalische Form

Supplied as a trifluoroacetate salt.

Rekonstituierung

Following reconstitution, aliquot and freeze (-20°C). Stock solutions are stable for up to 3 months at -20°C.

Sonstige Hinweise

Delaunay, A., et al. 2012. Proc. Natl. Acad. Sci.109, 13124.
Sherwood, T.W., et al. 2012. Am. J. Physiol. Cell Physiol.303, C699.
Karczewski, J., et al. 2010. Br J Pharmacol.161, 950.
Chagot, B., et al. 2005. Protein Sci.14, 2003.

Diochot, S., et al. 2004. EMBO J.23, 1516.

Rechtliche Hinweise

CALBIOCHEM is a registered trademark of Merck KGaA, Darmstadt, Germany

Sicherheitshinweise

• Lagerklassenschlüssel: 11 - Combustible Solids
• WGK: WGK 1
• Flammpunkt (°F): Not applicable
• Flammpunkt (°C): Not applicable