ヘテロディメア型の巻き巻きタンパク質で,ミト性染色体凝縮に in vitro で必要なものです
1Department of Pharmacology, University of California, San Francisco 94143-0450.
Cell
|November 4, 1994
まとめ
新しく特定された染色体タンパク質複合体,XCAP-C/Eは,Xenopusの卵抽出物におけるミト性染色体凝縮に不可欠である. このタンパク質は,細胞分裂中の染色体の組み立てと構造的整合性に不可欠です.
科学分野:
- 細胞生物学 細胞生物学
- 分子生物学は分子生物学である.
- バイオケミストリー バイオケミストリー
背景:
- ミトスの染色体凝縮は,正確な細胞分裂のための基本的なプロセスです.
- 染色体凝縮を駆動する分子機構は,まだ完全に理解されていない.
研究 の 目的:
- ミトスの染色体凝縮に関与する新しいタンパク質を特定し,特徴づけること.
- 特定されたタンパク質複合体の機能と構造的特性を解明する.
主な方法:
- クロモソーム組立のインビトロ研究のために使用されたXenopus卵のエキス.
- タンパク質の機能を評価するために,抗体阻害実験を行いました.
- アミノ酸の配列を推論し,保存されたタンパク質のモチーフを分析した.
主要な成果:
- 染色体凝縮に欠かせないヘテロダイマー型タンパク質複合体,XCAP-C/Eを特定しました.
- XCAP-C/Eがクロマチンに局所化し,組み合わされた染色体の中で内部構造を形成することを示した.
- 図示のXCAP-Cは,ミトスの染色体構造の組み立てと維持の両方に必要です.
結論:
- XCAP-C/E複合体は,ミトスの染色体凝縮の重要な調節体である.
- 特定されたタンパク質複合体は,保存された構造的モチーフを有しており,種間での保存された機能を示唆しています.
- このタンパク質ファミリーのさらなる研究により,細胞分裂におけるより広範な役割が明らかになる可能性があります.
関連する概念動画
Cohesins
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Cohesin complexes in Meiotic Division
Meiosis involves two distinct rounds of chromosomal segregation and cell divisions— Meiosis I followed by Meiosis II – producing four daughter cells. Meiosis I includes the separation of homologous...
Cohesin complexes in Meiotic Division
Meiosis involves two distinct rounds of chromosomal segregation and cell divisions— Meiosis I followed by Meiosis II – producing four daughter cells. Meiosis I includes the separation of homologous...
Condensins
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The plant and animal cells contain two types of condensin complexes—condensin I and condensin II. Both complexes have five subunits: two SMC (Structural Maintenance of Chromosomes) subunits, a kleisin subunit, and two HEAT-repeat...
The plant and animal cells contain two types of condensin complexes—condensin I and condensin II. Both complexes have five subunits: two SMC (Structural Maintenance of Chromosomes) subunits, a kleisin subunit, and two HEAT-repeat...
Attachment of Sister Chromatids
As cells progress into mitosis, the nuclear envelope breaks down, and the condensed chromosomes are exposed to the array of bipolar microtubules of the mitotic spindle. The kinetochore, a large, disc-shaped protein complex, is present at the centromere region of the sister chromatids and acts as a binding site for the microtubules. Usually, the plus-end of a single microtubule is embedded within the kinetochore. However, some kinetochores first establish lateral contact with the side-wall of a...
Forces Acting on Chromosomes
During mitosis, chromosome movements occur through the interplay of multiple piconewton level forces. In prometaphase, these forces help in chromosome assembly or congression at the equatorial plane, eventually leading to their alignment at the metaphase plate. The forces acting on the chromosomes are space and time-dependent; therefore, they vary with the position of the chromosomes as the cell progresses through mitosis.
Microtubules and motor proteins exert two types of forces on...
Microtubules and motor proteins exert two types of forces on...
Cohesins
Cohesin protein complexes are a molecular glue that holds two sister chromatids together. They play an important role both in mitosis and meiosis. In mitosis, all cohesin complexes present on the chromosomes are removed before the start of the anaphase stage.
Cohesin complexes in Meiotic Division
Meiosis involves two distinct rounds of chromosomal segregation and cell divisions— Meiosis I followed by Meiosis II – producing four daughter cells. Meiosis I includes the separation of homologous...
Cohesin complexes in Meiotic Division
Meiosis involves two distinct rounds of chromosomal segregation and cell divisions— Meiosis I followed by Meiosis II – producing four daughter cells. Meiosis I includes the separation of homologous...
Condensins
Condensins are large protein complexes that use ATP to fuel the assembly of chromosomes during mitosis. They transform the tangled, shapeless mass of post-interphase DNA into individualized chromosomes by compacting, organizing, and segregating chromosomal DNA.
The plant and animal cells contain two types of condensin complexes—condensin I and condensin II. Both complexes have five subunits: two SMC (Structural Maintenance of Chromosomes) subunits, a kleisin subunit, and two HEAT-repeat...
The plant and animal cells contain two types of condensin complexes—condensin I and condensin II. Both complexes have five subunits: two SMC (Structural Maintenance of Chromosomes) subunits, a kleisin subunit, and two HEAT-repeat...


