{
  "id": 6239077,
  "title": "Novel insights into the biosynthesis and diversity of leaderless multipeptide bacteriocins",
  "url": "https://urgent.news/2026/09/07/novel-insights-into-the-biosynthesis-and-diversity-of-leaderless",
  "topic": "culture",
  "section": "Culture",
  "published": "2026-09-07T00:00:00.000Z",
  "source": {
    "name": "bioRxiv",
    "slug": "biorxiv",
    "url": "https://www.biorxiv.org/content/10.64898/2026.09.04.749385v1?rss=1"
  },
  "original_language": "en",
  "account": "Garvicin KS (GarKS) is a three-peptide, leaderless, broad-spectrum bacteriocin capable of targeting a wide variety of Gram-positive bacteria, including several foodborne pathogens and antibiotic-resistant strains. The producer strain, Lactococcus garvieae KS1546, encodes the bacteriocin on a 50 kb plasmid (pKS50). Recent research has revealed that the producer strain should be reclassified as Lactococcus petauri. Two biosynthetic genes, gakR and gakI, play crucial roles in GarKS production. Disruption of gakR led to a significant reduction in GarKS production, while expression of gakI caused a drastic decrease in susceptibility to the bacteriocin, showing varying degrees of cross-immunity to other multipeptide bacteriocins. Analysis of spontaneous GarKS mutants in Lactococcus lactis showed that resistance levels are generally low, but the presence of ythA, a PspC-domain-containing protein involved in a phage stress response pathway, is associated with the GarKS susceptible phenotype. Genome mining techniques have identified 11 potential candidates for new multipeptide bacteriocins, four of which have been synthesized and confirmed to exhibit inhibitory properties against important pathogens like Listeria monocytogenes and enterococci.",
  "summary": "Garvicin KS (GarKS) is a three-peptide, leaderless, broad-spectrum bacteriocin that is active against a wide range of Gram-positive bacteria, including several foodborne pathogens and antibiotic-resistant strains. This bacteriocin is considered a candidate for application in food preservation and medical treatments; however, key knowledge about the producer strain, regulation of production, and…",
  "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."
}