National Institutes of Health/National Human Genome Research Institute (NIH/NHGRI)
GM073767
米国
National Institutes of Health/National Human Genome Research Institute (NIH/NHGRI)
GM108455
米国
National Institutes of Health/National Human Genome Research Institute (NIH/NHGRI)
R01GM082893
米国
National Institutes of Health/National Human Genome Research Institute (NIH/NHGRI)
1S10OD020054
米国
Other government
UCSF Program for Breakthrough Biomedical Research - New Technology Award
米国
引用
ジャーナル: Elife / 年: 2019 タイトル: Cryo-EM structures of remodeler-nucleosome intermediates suggest allosteric control through the nucleosome. 著者: Jean Paul Armache / Nathan Gamarra / Stephanie L Johnson / John D Leonard / Shenping Wu / Geeta J Narlikar / Yifan Cheng / 要旨: The SNF2h remodeler slides nucleosomes most efficiently as a dimer, yet how the two protomers avoid a tug-of-war is unclear. Furthermore, SNF2h couples histone octamer deformation to nucleosome ...The SNF2h remodeler slides nucleosomes most efficiently as a dimer, yet how the two protomers avoid a tug-of-war is unclear. Furthermore, SNF2h couples histone octamer deformation to nucleosome sliding, but the underlying structural basis remains unknown. Here we present cryo-EM structures of SNF2h-nucleosome complexes with ADP-BeF that capture two potential reaction intermediates. In one structure, histone residues near the dyad and in the H2A-H2B acidic patch, distal to the active SNF2h protomer, appear disordered. The disordered acidic patch is expected to inhibit the second SNF2h protomer, while disorder near the dyad is expected to promote DNA translocation. The other structure doesn't show octamer deformation, but surprisingly shows a 2 bp translocation. FRET studies indicate that ADP-BeF predisposes SNF2h-nucleosome complexes for an elemental translocation step. We propose a model for allosteric control through the nucleosome, where one SNF2h protomer promotes asymmetric octamer deformation to inhibit the second protomer, while stimulating directional DNA translocation.
全体 : Cryo-EM structure of singly-bound SNF2h-nucleosome complex with S...
全体
名称: Cryo-EM structure of singly-bound SNF2h-nucleosome complex with SNF2h bound at the flanking DNA proximal side
要素
複合体: Cryo-EM structure of singly-bound SNF2h-nucleosome complex with SNF2h bound at the flanking DNA proximal side
タンパク質・ペプチド: Histone H3.2
タンパク質・ペプチド: Histone H4
タンパク質・ペプチド: Histone H2A type 1
タンパク質・ペプチド: Histone H2B
タンパク質・ペプチド: Histone H2B
DNA: DNA (156-MER)
DNA: DNA (156-MER)
タンパク質・ペプチド: SWI/SNF-related matrix-associated actin-dependent regulator of chromatin subfamily A member 5
リガンド: ADENOSINE-5'-DIPHOSPHATE
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超分子 #1: Cryo-EM structure of singly-bound SNF2h-nucleosome complex with S...
超分子
名称: Cryo-EM structure of singly-bound SNF2h-nucleosome complex with SNF2h bound at the flanking DNA proximal side タイプ: complex / ID: 1 / 親要素: 0 / 含まれる分子: #1-#7
凍結剤: ETHANE / チャンバー内湿度: 100 % / チャンバー内温度: 295.15 K / 装置: FEI VITROBOT MARK I 詳細: 2.5 ul of nucleosome-443 SNF2h complexes were applied to a glow discharged Quantifoil holey carbon grid (1.2 um hole size, 400 mesh), blotted in a Vitrobot Mark I (FEI Company) using 6 ...詳細: 2.5 ul of nucleosome-443 SNF2h complexes were applied to a glow discharged Quantifoil holey carbon grid (1.2 um hole size, 400 mesh), blotted in a Vitrobot Mark I (FEI Company) using 6 seconds blotting at 100% humidity, and then plunge-frozen in liquid ethane cooled by liquid nitrogen..