National Institutes of Health/National Cancer Institute (NIH/NCI)
261198
米国
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
134020
米国
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
130302
米国
David and Lucile Packard Foundation
2019-69645
米国
Burroughs Wellcome Fund
1022785
米国
引用
ジャーナル: Cell / 年: 2025 タイトル: Centromeric chromatin clearings demarcate the site of kinetochore formation. 著者: Kathryn Kixmoeller / Ekaterina V Tarasovetc / Elie Mer / Yi-Wei Chang / Ben E Black / 要旨: The centromere is the chromosomal locus that recruits the kinetochore, directing faithful propagation of the genome during cell division. Using cryo-ET on human mitotic chromosomes, we reveal a ...The centromere is the chromosomal locus that recruits the kinetochore, directing faithful propagation of the genome during cell division. Using cryo-ET on human mitotic chromosomes, we reveal a distinctive architecture at the centromere: clustered 20- to 25-nm nucleosome-associated complexes within chromatin clearings that delineate them from surrounding chromatin. Centromere components CENP-C and CENP-N are each required for the integrity of the complexes, while CENP-C is also required to maintain the chromatin clearing. We find that CENP-C is required in mitosis, not just for kinetochore assembly, likely reflecting its role in organizing the inner kinetochore during chromosome segregation. We further visualize the scaffold of the fibrous corona, a structure amplified at unattached kinetochores, revealing crescent-shaped parallel arrays of fibrils extending >1 μm. Thus, we reveal how the organization of centromeric chromatin creates a clearing at the site of kinetochore formation as well as the nature of kinetochore amplification mediated by corona fibrils.
A: 8747.673 Å / B: 12313.439 Å / C: 3420.4 Å α=β=γ: 90.0 °
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添付データ
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試料の構成要素
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全体 : Mitotic chromosome
全体
名称: Mitotic chromosome
要素
細胞器官・細胞要素: Mitotic chromosome
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超分子 #1: Mitotic chromosome
超分子
名称: Mitotic chromosome / タイプ: organelle_or_cellular_component / ID: 1 / 親要素: 0 詳細: Centromere region of mitotic chromosome including the kinetochore, after degradation of CENP-C for 1 hour