7DBP

Linker histone defines structure and self-association behaviour of the 177 bp human chromosome

7DBP の概要

• エントリーDOI: 10.2210/pdb7dbp/pdb
• EMDBエントリー: 30161
• 分子名称: Histone H1.0, Histone H3.1, Histone H4, ... (7 entities in total)
• 機能のキーワード: chromatin compaction, nucleosome stacking, asymmetric, dna binding protein, structural protein
• 由来する生物種: Homo sapiens (Human); 詳細
• タンパク質・核酸の鎖数: 11
• 化学式量合計: 241995.63

構造登録者

Wang, S.,Vogirala, K.V.,Soman, A.,Liu, Z.B. (登録日: 2020-10-21, 公開日: 2020-12-23, 最終更新日: 2024-03-27)

主引用文献

Wang, S.,Vogirala, V.K.,Soman, A.,Berezhnoy, N.V.,Liu, Z.B.,Wong, A.S.W.,Korolev, N.,Su, C.J.,Sandin, S.,Nordenskiold, L.
Linker histone defines structure and self-association behaviour of the 177 bp human chromatosome.
Sci Rep, 11:380-380, 2021

PubMed Abstract: Linker histones play essential roles in the regulation and maintenance of the dynamic chromatin structure of higher eukaryotes. The influence of human histone H1.0 on the nucleosome structure and biophysical properties of the resulting chromatosome were investigated and compared with the 177-bp nucleosome using Cryo-EM and SAXS. The 4.5 Å Cryo-EM chromatosome structure showed that the linker histone binds at the nucleosome dyad interacting with both linker DNA arms but in a tilted manner leaning towards one of the linker sides. The chromatosome is laterally compacted and rigid in the dyad and linker DNA area, in comparison with the nucleosome where linker DNA region is more flexible and displays structural variability. In solution, the chromatosomes appear slightly larger than the nucleosomes, with the volume increase compared to the bound linker histone, according to solution SAXS measurements. SAXS X-ray diffraction characterisation of Mg-precipitated samples showed that the different shapes of the 177 chromatosome enabled the formation of a highly ordered lamello-columnar phase when precipitated by Mg, indicating the influence of linker histone on the nucleosome stacking. The biological significance of linker histone, therefore, may be affected by the change in the polyelectrolyte and DNA conformation properties of the chromatosomes, in comparison to nucleosomes.

PubMed: 33432055
DOI: 10.1038/s41598-020-79654-8

実験手法

ELECTRON MICROSCOPY (4.5 Å)