2nzd

Nucleosome core particle containing 145 bp of DNA

spinqualitylabelsall models 2nzd, resolution 2.65Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2nzd is a 10 chain structure with sequence from Xenopus laevis. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.65Å Ligands: MN Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function H32_XENLA Core component of nucleosome. Nucleosomes wrap and compact DNA into chromatin, limiting DNA accessibility to the cellular machineries which require DNA as a template. Histones thereby play a central role in transcription regulation, DNA repair, DNA replication and chromosomal stability. DNA accessibility is regulated via a complex set of post-translational modifications of histones, also called histone code, and nucleosome remodeling. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed DNA stretching in chromatin may facilitate its compaction and influence site recognition by nuclear factors. In vivo, stretching has been estimated to occur at the equivalent of one to two base-pairs (bp) per nucleosome. We have determined the crystal structure of a nucleosome core particle containing 145 bp of DNA (NCP145). Compared to the structure with 147 bp, the NCP145 displays two incidences of stretching one to two double-helical turns from the particle dyad axis. The stretching illustrates clearly a mechanism for shifting DNA position by displacement of a single base-pair while maintaining nearly identical histone-DNA interactions. Increased DNA twist localized to a short section between adjacent histone-DNA binding sites advances the rotational setting, while a translational component involves DNA kinking at a flanking region that initiates elongation by unstacking bases. Furthermore, one stretched region of the NCP145 displays an extraordinary 55 degrees kink into the minor groove situated 1.5 double-helical turns from the particle dyad axis, a hot spot for gene insertion by HIV-integrase, which prefers highly distorted substrate. This suggests that nucleosome position and context within chromatin could promote extreme DNA kinking that may influence genomic processes. DNA stretching and extreme kinking in the nucleosome core.,Ong MS, Richmond TJ, Davey CA J Mol Biol. 2007 May 11;368(4):1067-74. Epub 2007 Mar 2. PMID:17379244 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Histone 3D structures

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