ジャーナル: EMBO Rep / 年: 2025 タイトル: A pivot-tether model for nucleosome recognition by the chromosomal passenger complex. 著者: Reinis R Ruza / Chyi Wei Chung / Danny B H Gold / Michela Serena / Emile Roberts / Ulrike Gruneberg / Francis A Barr / 要旨: Spatial restriction of Aurora B to T3-phosphorylated histone H3 (H3pT3) nucleosomes adjacent to centromeres during prometaphase and metaphase enables it to phosphorylate proteins necessary for ...Spatial restriction of Aurora B to T3-phosphorylated histone H3 (H3pT3) nucleosomes adjacent to centromeres during prometaphase and metaphase enables it to phosphorylate proteins necessary for spindle assembly checkpoint signalling and biorientation of chromosomes on the mitotic spindle. Aurora B binding to H3pT3-nucleosomes requires a multivalent targeting module, the chromosomal passenger complex (CPC), consisting of survivin, borealin, and INCENP. To shed light on how these components mediate CPC localisation during prometaphase and metaphase, we determined the structure of the CPC targeting module in complex with haspin-phosphorylated H3pT3-nucleosomes by cryo-electron microscopy. This structure shows how the N-terminus of borealin and the survivin BIR domain act as pivot and flexible tethering points, respectively, to increase CPC affinity for H3pT3 nucleosomes without limiting it to a specific orientation. We demonstrate that this flexible, yet constrained pivot-tether arrangement is important for the control of spindle assembly checkpoint signalling by Aurora B.
Movies motion-corrected on-the-fly using SIMPLE (Caesar, et al., 2020)
粒子像選択
選択した数: 3099937 詳細: Blob-based picking, using 110 A expected particle diameter.
CTF補正
ソフトウェア - 名称: cryoSPARC (ver. 4.4.0) / ソフトウェア - 詳細: Patch-CTF estimation job used 詳細: CTF amplitude correction first performed following movie motion correction, and CTF parameters were later refined during the refinement of the final reconstruction タイプ: PHASE FLIPPING AND AMPLITUDE CORRECTION
初期モデル
モデルのタイプ: NONE
最終 再構成
使用したクラス数: 1 / 解像度のタイプ: BY AUTHOR / 解像度: 2.42 Å / 解像度の算出法: FSC 0.143 CUT-OFF ソフトウェア: (名称: cryoSPARC (ver. 4.4.0), RELION (ver. 4.0)) 詳細: Final reconstruction performed following particle polishing in Relion and subsequent re-import in CryoSPARC. The CPC distal region was then further locally refined and sharpened using ...詳細: Final reconstruction performed following particle polishing in Relion and subsequent re-import in CryoSPARC. The CPC distal region was then further locally refined and sharpened using DeepEMhancer. The resolution value given for the raw final reconstruction before local refinement. 使用した粒子像数: 119063
初期 角度割当
タイプ: NOT APPLICABLE
最終 角度割当
タイプ: NOT APPLICABLE
最終 3次元分類
クラス数: 2 / 平均メンバー数/クラス: 83358 / ソフトウェア - 名称: cryoSPARC (ver. 4.4.0) 詳細: Performed using a heterogenous refinement job with 2 classes.