6a2i

Architectural roles of Cren7 in folding crenarchaeal chromatin filament

spinqualitylabelsall models 6a2i, resolution 2.40Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 6a2i is a 4 chain structure with sequence from Sacs2. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Related: 6a2h Gene: creN7, SSO6901 (SACS2) Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [CREN7_SULSO] A highly abundant probable chromatin protein, it binds double-strand DNA without sequence specificity; there is approximately 1 Cren7 molecule for 12 bp of DNA. Constrains negative DNA supercoils, increases DNA stability against thermal denaturation. Binding does not require protein methylation. Binds single-strand DNA weakly. Publication Abstract from PubMed Archaea have evolved various strategies in chromosomal organization. While histone homologues exist in most archaeal phyla, Cren7 is a chromatin protein conserved in the Crenarchaeota. Here, we show that Cren7 preferentially binds DNA with AT-rich sequences over that with GC-rich sequences with a binding size of 6~7 bp. Structural studies of Cren7 in complex with either an 18-bp or a 20-bp double-stranded DNA fragment reveal that Cren7 binds to the minor groove of DNA as monomers in a head-to-tail manner. The neighboring Cren7 monomers are located on the opposite sides of the DNA duplex, with each introducing a single-step sharp kink by intercalation of the hydrophobic side chain of Leu28, bending the DNA into an S-shape conformation. A structural model for the chromatin fiber folded by Cren7 was established and verified by the analysis of cross-linked Cren7-DNA complexes by atomic force microscopy. Our results suggest that Cren7 differs significantly from Sul7, another chromatin protein conserved among Sulfolobus species, in both DNA binding and deformation. These data shed significant light on the strategy of chromosomal DNA organization in crenarchaea. Architectural roles of Cren7 in folding crenarchaeal chromatin filament.,Zhang Z, Zhao M, Chen Y, Wang L, Liu Q, Dong Y, Gong Y, Huang L Mol Microbiol. 2018 Nov 30. doi: 10.1111/mmi.14173. PMID:30499242 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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