9uz7

Cryo-EM structure of the nucleosome core particle with site-specific DNA-histone crosslinking

spinqualitylabelsall models 9uz7, resolution 3.24Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 9uz7 is a 10 chain structure with sequence from Homo sapiens and Synthetic construct. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Electron Microscopy, Resolution 3.24Å Ligands: YCM Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function H31_HUMAN Publication Abstract from PubMed DNA-histone cross-links (DHCs) frequently arise within nucleosomes during DNA damage and repair processes. However, the functional consequences of DHC within nucleosomes remain largely unexplored. In this study, we prepared structurally homogeneous nucleosomes containing a single, site-specific DHC using click chemistry and systematically evaluated the impact of DHC on nucleosome structure and function. Our results show that DHC markedly enhances nucleosome thermal stability and completely blocks both thermally induced passive sliding and chromatin remodeler-mediated active sliding. Moreover, DHC obstructs SP6 RNA polymerase-driven transcription elongation through nucleosomes, leading to premature termination approximately 15 bp upstream of the cross-linking site. DHC also increases histone resistance to proteolytic digestion within nucleosomes. These findings suggest that even a single DHC can substantially lock and rigidify the nucleosome structure and broadly interfere with the recognition and processing of nucleosomes by various cellular machineries, thereby rendering DHC a highly toxic and persistent form of DNA damage. This in vitro study highlights the unique impact of DHC on nucleosome architecture and is expected to motivate further exploration of its biological roles in vivo. DNA - histone cross-link locks the nucleosome structure and disrupts its recognition and processing.,Shan X, Ji G, Li J, Ren M, Ma J, Zhou Y, Li H, Zhou C Protein Cell. 2025 Nov 5:pwaf094. doi: 10.1093/procel/pwaf094. PMID:41206067 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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