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.
ダウンロード / ファイル: emd_44864.map.gz / 形式: CCP4 / 大きさ: 569 MB / タイプ: IMAGE STORED AS SIGNED BYTE
注釈
Kinetochore on isolated human mitotic chromosome under conditions of prolonged spindle detachment
ボクセルのサイズ
X=Y=Z: 8.551 Å
密度
最小 - 最大
-128.0 - 127.0
平均 (標準偏差)
35.106119999999997 (±22.185064000000001)
対称性
空間群: 1
詳細
EMDB XML:
マップ形状
Axis order
X
Y
Z
Origin
-209
209
-203
サイズ
1440
1023
405
Spacing
1023
1440
405
セル
A: 8747.673 Å / B: 12313.439 Å / C: 3463.1548 Å α=β=γ: 90.0 °
-
添付データ
-
試料の構成要素
-
全体 : Mitotic chromosome
全体
名称: Mitotic chromosome
要素
細胞器官・細胞要素: Mitotic chromosome
-
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 prolonged spindle detachment