{
  "id": 14094391,
  "title": "Gain-of-function mutations in the RodZ juxtamembrane domain promote Rod system activity in Escherichia coli",
  "url": "https://urgent.news/2026/10/12/gain-of-function-mutations-in-the-rodz-juxtamembrane-domain-promote",
  "topic": "science",
  "section": "Science",
  "published": "2026-10-12T00:00:00.000Z",
  "source": {
    "name": "bioRxiv",
    "slug": "biorxiv",
    "url": "https://www.biorxiv.org/content/10.64898/2026.10.11.758364v1?rss=1"
  },
  "original_language": "en",
  "account": "Gain-of-function mutations in a specific domain of the RodZ protein enhance activity of the Rod system in Escherichia coli, according to research. The peptidoglycan cell wall, which provides protection and shape to bacteria, is elongated by the Rod system in rod-shaped bacteria. This system comprises the RodA-PBP2 complex, the actin-like protein MreB, and accessory proteins MreC, MreD, and RodZ. RodZ shares domain organization with FtsN, a protein crucial for triggering PG synthesis during cell division. Both proteins are single-pass transmembrane proteins with actin-like binding sites in the cytoplasm and unstructured periplasmic regions. The study sought to determine if RodZ could function similarly to FtsN in activating the Rod system. By creating gain-of-function variants of RodZ that restored growth and shape in cells with a mutated MreC gene, the researchers found that these variants increased resistance to the MreB antagonist A22 and heightened sensitivity to the antibiotic mecillinam. These traits are linked to Rod system hyperactivation, and the study discovered that they were caused by alterations in the cytoplasmic juxtamembrane domain of RodZ. This domain is comparable to the N-terminus of FtsN, which promotes divisome activation through interaction with FtsA protein filaments. Structural modeling suggests that RodZ's JM domain is likely to associate with MreB filaments. The findings support the hypothesis that RodZ activates PG synthesis by the Rod system through a mechanism akin to divisome activation by FtsN.",
  "summary": "The peptidoglycan (PG) cell wall protects bacteria from osmotic lysis and determines their shape. In rod-shaped bacteria, the lateral wall is elongated by the Rod system (elongasome). This synthetic machine is built around the RodA-PBP2 PG synthase complex, the actin-like protein MreB, and the accessory proteins MreC, MreD, and RodZ. Notably, RodZ shares a similar domain organization with FtsN,…",
  "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."
}