7PB4

Cenp-HIK 3-protein complex

7PB4 の概要

• エントリーDOI: 10.2210/pdb7pb4/pdb
• 分子名称: Centromere protein H, Centromere protein I, Centromere protein K (3 entities in total)
• 機能のキーワード: inner kinetochore, cell cycle
• 由来する生物種: Homo sapiens (human); 詳細
• タンパク質・核酸の鎖数: 3
• 化学式量合計: 44055.84

構造登録者

Bellini, D.,Yatskevich, S.,Muir, W.K.,Barford, D. (登録日: 2021-07-30, 公開日: 2022-04-27, 最終更新日: 2024-01-31)

主引用文献

Yatskevich, S.,Muir, K.W.,Bellini, D.,Zhang, Z.,Yang, J.,Tischer, T.,Predin, M.,Dendooven, T.,McLaughlin, S.H.,Barford, D.
Structure of the human inner kinetochore bound to a centromeric CENP-A nucleosome.
Science, 376:844-852, 2022

PubMed Abstract: Kinetochores assemble onto specialized centromeric CENP-A (centromere protein A) nucleosomes (CENP-A) to mediate attachments between chromosomes and the mitotic spindle. We describe cryo-electron microscopy structures of the human inner kinetochore constitutive centromere associated network (CCAN) complex bound to CENP-A reconstituted onto α-satellite DNA. CCAN forms edge-on contacts with CENP-A, and a linker DNA segment of the α-satellite repeat emerges from the fully wrapped end of the nucleosome to thread through the central CENP-LN channel that tightly grips the DNA. The CENP-TWSX histone-fold module further augments DNA binding and partially wraps the linker DNA in a manner reminiscent of canonical nucleosomes. Our study suggests that the topological entrapment of the linker DNA by CCAN provides a robust mechanism by which kinetochores withstand both pushing and pulling forces exerted by the mitotic spindle.

PubMed: 35420891
DOI: 10.1126/science.abn3810

実験手法

X-RAY DIFFRACTION (2.49 Å)