{
  "id": 5383609,
  "title": "Scorpion toxin peptide BMK86-P1 achieves mutation-reversible inhibition of KCNA2 at the cost of reduced efficacy in heteromers and murine neurons",
  "url": "https://urgent.news/2026/09/03/scorpion-toxin-peptide-bmk86-p1-achieves-mutation-reversible",
  "topic": "science",
  "section": "Science",
  "published": "2026-09-03T00:00:00.000Z",
  "source": {
    "name": "bioRxiv",
    "slug": "biorxiv",
    "url": "https://www.biorxiv.org/content/10.64898/2026.08.28.747831v1?rss=1"
  },
  "original_language": "en",
  "account": "Scientists have developed a peptide, BMK86-P1, which selectively inhibits a specific potassium channel subunit called KV1.2. This discovery is significant as it could pave the way for precision medicine, allowing the development of treatments tailored to individual genetic mutations. However, the peptide's efficacy is reduced when it interacts with other potassium channel subunits, forming what are known as heteromers.\n\nIn mammalian cells, BK86-P1 selectively inhibited KV1.2 homomers, but not when combined with KV1.1 subunits, forming heteromers. The key finding was that the mutation in the KCNA2 gene, p.Val381Tyr, which reverses BMK86-P1's selective inhibition of KV1.2, also altered the way KV1.2 homomers function, making them resemble KV1.1 channels.\n\nInterestingly, when BMK86-P1 was tested in murine neurons, it did not alter the membrane properties, action potential characteristics, or firing frequency. Instead, it only caused minor changes in spontaneous excitatory postsynaptic currents. The researchers concluded that while the peptide exerts its effects on homomeric channels, it only weakly inhibits KV1.2-heteromeric channels. This finding underscores the limitations of peptide synthesis and emphasizes the importance of testing specific compounds in complex systems to fully understand their effects on neuronal function.",
  "summary": "The discovery of distinctive function-phenotype relationships in monogenetic channelopathies has turned out to be critical for the development of precision medicine approaches. However, the best prediction of clinical phenotypes depends on neuronal function, where existing models lack tools to isolate currents of individual voltage-gated potassium channel subunits and differentiate variant…",
  "key_points": [],
  "editors_take": null,
  "illustration": null,
  "coverage": {
    "outlets": 1,
    "also_reported_by": []
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}