9f0e

Bacterial histone protein HBb from Bdellovibrio bacteriovorus bound to DNA

spinqualitylabelsall models 9f0e, resolution 1.85Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 9f0e is a 3 chain structure with sequence from Bdellovibrio bacteriovorus HD100 and Synthetic construct. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.85Å Ligands: PO4 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function Q6MRM1_BDEBA Publication Abstract from PubMed Histones are essential for genome compaction and transcription regulation in eukaryotes, where they assemble into octamers to form the nucleosome core. In contrast, archaeal histones assemble into dimers that form hypernucleosomes upon DNA binding. Although histone homologs have been identified in bacteria recently, their DNA-binding characteristics remain largely unexplored. Our study reveals that the bacterial histone HBb (Bd0055) is indispensable for the survival of Bdellovibrio bacteriovorus, suggesting critical roles in DNA organization and gene regulation. By determining crystal structures of free and DNA-bound HBb, we unveil its distinctive dimeric assembly, diverging from those of eukaryotic and archaeal histones, while also elucidating how it binds and bends DNA through interaction interfaces reminiscent of eukaryotic and archaeal histones. Building on this, by employing various biophysical and biochemical approaches, we further substantiated the ability of HBb to bind and compact DNA by bending in a sequence-independent manner. Finally, using DNA affinity purification and sequencing, we reveal that HBb binds along the entire genomic DNA of B. bacteriovorus without sequence specificity. These distinct DNA-binding properties of bacterial histones, showcasing remarkable similarities yet significant differences from their archaeal and eukaryotic counterparts, highlight the diverse roles histones play in DNA organization across all domains of life. Bacterial histone HBb from Bdellovibrio bacteriovorus compacts DNA by bending.,Hu Y, Schwab S, Deiss S, Escudeiro P, van Heesch T, Joiner JD, Vreede J, Hartmann MD, Lupas AN, Alvarez BH, Alva V, Dame RT Nucleic Acids Res. 2024 Jun 12:gkae485. doi: 10.1093/nar/gkae485. PMID:38864377 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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