- EMDB-3769: Cryo-EM structure of a pre-catalytic human spliceosome primed for... -
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データベース: EMDB / ID: EMD-3769
タイトル
Cryo-EM structure of a pre-catalytic human spliceosome primed for activation (B complex). Unmasked refinement, NON-sharpened map
マップデータ
NON-sharpened, unmasked refinement. Map was aligned to high resolution map (EMDB 3766) and RESAMPLED from 256 px boxsize to 432 px boxsize in Chimera to fit high-resolution map.
試料
複合体: Cryo-EM structure of a pre-catalytic human spliceosome primed for activation (B complex). Unmasked refinement, NON-sharpened map
ジャーナル: Cell / 年: 2017 タイトル: Cryo-EM Structure of a Pre-catalytic Human Spliceosome Primed for Activation. 著者: Karl Bertram / Dmitry E Agafonov / Olexandr Dybkov / David Haselbach / Majety N Leelaram / Cindy L Will / Henning Urlaub / Berthold Kastner / Reinhard Lührmann / Holger Stark / 要旨: Little is known about the spliceosome's structure before its extensive remodeling into a catalytically active complex. Here, we report a 3D cryo-EM structure of a pre-catalytic human spliceosomal B ...Little is known about the spliceosome's structure before its extensive remodeling into a catalytically active complex. Here, we report a 3D cryo-EM structure of a pre-catalytic human spliceosomal B complex. The U2 snRNP-containing head domain is connected to the B complex main body via three main bridges. U4/U6.U5 tri-snRNP proteins, which are located in the main body, undergo significant rearrangements during tri-snRNP integration into the B complex. These include formation of a partially closed Prp8 conformation that creates, together with Dim1, a 5' splice site (ss) binding pocket, displacement of Sad1, and rearrangement of Brr2 such that it contacts its U4/U6 substrate and is poised for the subsequent spliceosome activation step. The molecular organization of several B-specific proteins suggests that they are involved in negatively regulating Brr2, positioning the U6/5'ss helix, and stabilizing the B complex structure. Our results indicate significant differences between the early activation phase of human and yeast spliceosomes.
ダウンロード / ファイル: emd_3769.map.gz / 形式: CCP4 / 大きさ: 307.5 MB / タイプ: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
注釈
NON-sharpened, unmasked refinement. Map was aligned to high resolution map (EMDB 3766) and RESAMPLED from 256 px boxsize to 432 px boxsize in Chimera to fit high-resolution map.