関連する実験動画
Updated: Feb 9, 2026
02:31
Phase Transitions and Effect of Intermolecular Forces
23.3K
酵母菌におけるセントロメリックヌクレオソームの細胞周期結合構造的振動
Manjunatha Shivaraju1, Jay R Unruh, Brian D Slaughter
1Stowers Institute for Medical Research, Kansas City, MO 64110, USA.
Cell
|July 24, 2012
まとめ
発芽中の酵母センターロメアには,ヒストン変異体Cse4 (センターロメア核細胞体) のコピーは1つあり,細胞周期の大半にわたって存在します. この構造はアナフェーズ中に2つの複製に倍増し,細胞サイクル結合による細胞核細胞構造の変化を示しています.
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.
- 遺伝学 遺伝学とは
背景:
- セントロメアは,細胞分裂中の正確な染色体分離に不可欠です.
- セントロメアは,ヒストンH3の変種を含む特殊な核分裂体によって特徴付けられます.
- 芽生えた酵母では,Cse4は,セントロメアで発見された正規のヒストンH3変異体です.
研究 の 目的:
- 生きた酵母細胞における,センターメリックヒストンH3変異体,Cse4の複製数と構造的ダイナミクスを調査する.
- セルサイクル依存の細胞核細胞組成の変異を調査する.
主な方法:
- 活酵母における定量分析のために,光相関スペクトロスコーピー (FCS) と校正画像を組み合わせた新しい方法を開発した.
- 核細胞組成を分析するために核細胞再構成とChIP (クロマチン免疫降水) 解析を用いた.
- Cse4-Cse4の相互作用と,細胞サイクル中のScm3の役割について調査した.
主要な成果:
- セントロメリックヌクレオソームのCse4複製数が定量化され,インターフェーズ中に1つの複製とアナフェーズ中に2つの複製を明らかにします.
- センターメリックヌクレオソームの細胞サイクル結合構造変化が観察され,Cse4の組み込みとアナフェーズでの堆積が増加しました.
- 両方のCse4構造にH2A/H2Bの存在を確認し,Candida albicansに類似したアナフェーズ特異的な変化を観察した.
結論:
- セントロメリックヌクレオソームは,その構造において,特にCse4複製数に関して,細胞サイクル結合の振動を示す.
- この発見は,細胞分裂中に変化するセントロメリック核細胞構造のダイナミックモデルを支持する.
- 観察された現象は,異なる酵母種にわたって保存され,根本的な重要性を示唆しています.
関連する概念動画
Phase Transitions
23.3K
Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
23.3K
Properties of Transition Metals
30.0K
Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
30.0K
Cooperative Allosteric Transitions
8.8K
Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
8.8K
Phase Transitions: Vaporization and Condensation
21.5K
The physical form of a substance changes on changing its temperature. For example, raising the temperature of a liquid causes the liquid to vaporize (convert into vapor). The process is called vaporization—a surface phenomenon. Vaporization occurs when the thermal motion of the molecules overcome the intermolecular forces, and the molecules (at the surface) escape into the gaseous state. When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas phase molecules...
21.5K
Phase Transitions: Sublimation and Deposition
20.3K
Some solids can transition directly into the gaseous state, bypassing the liquid state, via a process known as sublimation. At room temperature and standard pressure, a piece of dry ice (solid CO2) sublimes, appearing to gradually disappear without ever forming any liquid. Snow and ice sublimate at temperatures below the melting point of water, a slow process that may be accelerated by winds and the reduced atmospheric pressures at high altitudes. When solid iodine is warmed, the solid sublimes...
20.3K
Phase Transitions: Melting and Freezing
15.2K
Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
15.2K