{
  "id": 7832496,
  "title": "J-domain proteins stimulate PKL-mediated chromatin compaction at H3K4-hypomethylated genomic loci",
  "url": "https://urgent.news/2026/09/16/j-domain-proteins-stimulate-pkl-mediated-chromatin-compaction-at-h3k4",
  "topic": "science",
  "section": "Science",
  "published": "2026-09-16T00:00:00.000Z",
  "source": {
    "name": "bioRxiv",
    "slug": "biorxiv",
    "url": "https://www.biorxiv.org/content/10.64898/2026.09.14.751395v1?rss=1"
  },
  "original_language": "en",
  "account": "Chromatin accessibility varies across distinct genomic regions in eukaryotes, but the mechanisms behind these differences are not well understood. Researchers have now identified a subfamily of J-domain proteins (JDPs) that, together with PICKLE (PKL), an evolutionarily conserved chromatin remodeler, form a complex in Arabidopsis thaliana. These JDPs are crucial for both stabilizing PKL protein and activating its nucleosome remodeling and ATPase functions. A previously unknown histone-binding domain within JDPs specifically targets the N-terminal tail of histone H3 when the H3K4me3 modification is absent. This interaction boosts PKL's ability to slide nucleosomes and carry out ATPase activities in a laboratory setting, and also promotes PKL-dependent chromatin compaction at genomic locations where H3K4me3 is lacking. This complex activity leads to chromatin compaction at H3K4me3-depleted sites, effectively silencing developmentally regulated genes and orchestrating crucial developmental phase transitions like the embryo-to-seedling transition and flowering. These findings reveal a novel approach where the absence of H3K4me3 is recognized to trigger regional chromatin compaction, suppress developmentally regulated genes, and enable key developmental transitions.",
  "summary": "Chromatin accessibility varies widely across distinct genomic regions in eukaryotes, yet the mechanisms governing these differential patterns remain poorly understood. Here, we identify a subfamily of functionally redundant J-domain proteins (JDPs) that assemble into a protein complex with PICKLE (PKL), an evolutionarily conserved CHD3-type chromatin remodeler, in Arabidopsis thaliana. JDPs are…",
  "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."
}