9HMV

Cryo-EM structure of SA2-SCC1 complex at 2.9 angstrom

9HMV の概要

• エントリーDOI: 10.2210/pdb9hmv/pdb
• 関連するPDBエントリー: 9HMS
• EMDBエントリー: 52291 52294 52295 52297 52298
• 分子名称: Cohesin subunit SA-2, Double-strand-break repair protein rad21 homolog (2 entities in total)
• 機能のキーワード: separase, cell cycle, scc1, rad21, protease, chromosome segregation, auto-cleavage, sa1/2, cohesin
• 由来する生物種: Homo sapiens (human); 詳細
• タンパク質・核酸の鎖数: 2
• 化学式量合計: 173423.63

構造登録者

Yu, J.,Schmidt, S.,Botto, M.,Boland, A. (登録日: 2024-12-09, 公開日: 2025-09-03, 最終更新日: 2026-05-06)

主引用文献

Yu, J.,Schmidt, S.,Botto, M.,Lee, K.,Ghent, C.M.,Goodfried, J.M.,Howe, A.,O'Reilly, F.J.,Morgan, D.O.,Boland, A.
Substrate recognition by human separase.
Sci Adv, 11:eady9807-eady9807, 2025

PubMed Abstract: The cohesin complex encircles sister chromatids in early mitosis. At anaphase onset, sister separation is triggered by the proteolytic cleavage of the cohesin subunit SCC1/RAD21 by separase. SCC1 contains two cleavage sites, where cleavage is stimulated by SCC1 phosphorylation. Substrate recognition and cleavage are only partly understood. Here, we determined structures of human separase in apo- or substrate-bound forms that, together with biochemical analysis, provide critical insights into separase cleavage regulation. We verify the first SCC1 cleavage site and reassign the second. We show that substrates, including separase autocleavage sites and the two SCC1 cleavage sites, interact with docking sites in separase, including five phosphate-binding sites. We also describe the interaction between the cohesin subunit SA1/SA2 and separase, which promotes cleavage at the second SCC1 site. Using cross-linking mass spectrometry and cryo-electron microscopy, we propose how cohesin is targeted by human separase. Our work provides an extensive functional and structural framework that explains a key event in cell division.

PubMed: 41223273
DOI: 10.1126/sciadv.ady9807

実験手法

ELECTRON MICROSCOPY (2.9 Å)