{
  "id": 9038606,
  "title": "Gβγ dually regulates the M current via increased channel surface expression and PIP2 sensitivity",
  "url": "https://urgent.news/2026/09/21/g-dually-regulates-the-m-current-via-increased-channel-surface",
  "topic": "science",
  "section": "Science",
  "published": "2026-09-21T00:00:00.000Z",
  "source": {
    "name": "bioRxiv",
    "slug": "biorxiv",
    "url": "https://www.biorxiv.org/content/10.64898/2026.09.15.751787v1?rss=1"
  },
  "original_language": "en",
  "account": "The M-current, produced by voltage-gated KV7.2/7.3 channels, influences neuronal action potential thresholds and acts as a crucial inhibitor for repetitive firing. This current's regulation is influenced by signaling molecules, including calmodulin and phosphatidylinositol-4,5-bisphosphate (PIP2). Researchers have discovered that the coexpression of the Gβγ subunit dimer with KV7.2/7.3 in Xenopus laevis oocytes results in a doubling of the maximum M-current. This regulation is achieved through two independent mechanisms: increasing the number of channel proteins on the plasma membrane and enhancing the coupling between KV7.2/7.3 and PIP2. On the other hand, scavengers of Gβγ reduce the basal KV7.2/7.3 current and weaken the PIP2 coupling. Proximity ligation assays confirm the colocalization of Gβγ and KV7.2/7.3 at the plasma membrane. Peptide array and AlphaFold modeling have identified potential interaction sites on the channel's cytoplasmic domain. Additionally, a disease-causing Gβ1 variant, I80N, prevents the Gβγ-induced potentiation of M-current. These findings underscore the significant physiological role of Gβγ as a regulator and a potential vulnerability site in neuronal M-current function.",
  "summary": "The M-current, generated by voltage gated KV7.2/7.3 channels, sets the threshold for neuronal action potential and acts as a key brake on repetitive firing. The M-current is tightly regulated by signaling molecules, such as calmodulin and phosphatidylinositol-4,5-bisphosphate (PIP2). Here, we show that coexpression of the ubiquitous subunit dimer of heterotrimeric G-proteins, G{beta}{gamma}, with…",
  "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."
}