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XB-ART-53990
Mol Cell 2017 May 04;663:384-397.e8. doi: 10.1016/j.molcel.2017.04.012.
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Structure and Dynamics of a 197 bp Nucleosome in Complex with Linker Histone H1.

Bednar J , Garcia-Saez I , Boopathi R , Cutter AR , Papai G , Reymer A , Syed SH , Lone IN , Tonchev O , Crucifix C , Menoni H , Papin C , Skoufias DA , Kurumizaka H , Lavery R , Hamiche A , Hayes JJ , Schultz P , Angelov D , Petosa C , Dimitrov S .


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Linker histones associate with nucleosomes to promote the formation of higher-order chromatin structure, but the underlying molecular details are unclear. We investigated the structure of a 197 bp nucleosome bearing symmetric 25 bp linker DNA arms in complex with vertebrate linker histone H1. We determined electron cryo-microscopy (cryo-EM) and crystal structures of unbound and H1-bound nucleosomes and validated these structures by site-directed protein cross-linking and hydroxyl radical footprinting experiments. Histone H1 shifts the conformational landscape of the nucleosome by drawing the two linkers together and reducing their flexibility. The H1 C-terminal domain (CTD) localizes primarily to a single linker, while the H1 globular domain contacts the nucleosome dyad and both linkers, associating more closely with the CTD-distal linker. These findings reveal that H1 imparts a strong degree of asymmetry to the nucleosome, which is likely to influence the assembly and architecture of higher-order structures.

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Species referenced: Xenopus laevis
Genes referenced: kidins220

References [+] :
Abrishami, Alignment of direct detection device micrographs using a robust Optical Flow approach. 2015, Pubmed