マクロ分子凝縮は,pHグラデントを設定するために,核子子相を組織する
Matthew R King1, Kiersten M Ruff1, Andrew Z Lin1
1Department of Biomedical Engineering, James McKelvey School of Engineering, Washington University in St. Louis, St. Louis, MO, USA; Center for Biomolecular Condensates, James McKelvey School of Engineering, Washington University in St. Louis, St. Louis, MO, USA.
Cell
|March 19, 2024
まとめ
核タンパク質の内在的に乱れた領域 (IDR) は,細胞内の凝縮物形成とpHグラデーションを駆動する. これらの特徴は,相分離と物理化学的性質を制御することによって,核組織と機能を決定する.
科学分野:
- 細胞生物学
- 生物化学
- バイオ物理学
背景:
- 核細胞は多成分凝縮物として構成される 重要な細胞部位である.
- これらのコンデンサートは 細胞機能に不可欠な 異なるサブフェーズを示します
- 核組織と相分離の分子基盤は完全に理解されていません.
研究 の 目的:
- その局所化と凝縮物形成を制御する核タンパク質の重要な特徴を特定する.
- 核組織における本質的に無秩序な領域 (IDR) の役割を調査する.
- 核凝縮物のpHを含む物理化学的性質とその細胞機能への影響を解明する.
主な方法:
- 核タンパク質の内在的に乱れた領域 (IDR) の特定,酸性 (D/E) 経路とKブロックに焦点を当てた.
- 核分子の凝縮と複合的コアセルベーションを研究するための in vitro 再構成アッセイ
- pHグラデーションの形成と対核体の性質を分析するための細胞研究.
主要な成果:
- 特定の充電プロファイル (例えば,D/E経路) を特徴とする明確なIDRは,核タンパク質の特徴を定義するものである.
- タンパク質IDRとRNA/DNA結合ドメインは,核タンパク質の局所偏好を決定する.
- 核凝縮物は,D/E経路と核RNAによって確立された,核質と比較して低いpHを示します.
- ジュクスタ核体は,異なるタンパク質IDR組成により,異なる物理化学的性質を示す.
結論:
- タンパク質の固有の無秩序な領域の特定の構成は,細胞凝縮物の物理化学的性質を決定する.
- 異なるコンデンサート組成は 独特のpH環境を生み出し 細胞の組織と機能に影響を与えます
- この研究は,核および関連する構造内の相分離と組織を規定する原理の洞察を提供します.
関連する概念動画
Condensins
3.5K
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...
3.5K
The Nucleolus
8.8K
The nucleolus is the most prominent substructure of the nucleus. When it was first discovered, it was considered to be an isolated organelle that forms fibrils and granules. In 1931, the relationship between the nucleolus and chromosomes was first described by Heitz. He observed that the appearance and size of nucleolus varies depending on the stage of the cell cycle. He also noticed constricted regions on different chromosomes clustered together at definite cell cycle stages. These regions,...
8.8K
Nuclear Protein Sorting
4.6K
Nuclear protein sorting is the selective trafficking of histones, polymerases, gene regulatory proteins into the nucleus and exporting RNAs and ribosomes to the cytosol. It is a tightly controlled process that regulates gene expression within a cell.
Proteins targeted to the nucleus carry nuclear localization signals or NLS recognized by import receptors in the cytosol. Similarly, proteins with nuclear export signals are recognized by export receptors. Import and export receptors are...
Proteins targeted to the nucleus carry nuclear localization signals or NLS recognized by import receptors in the cytosol. Similarly, proteins with nuclear export signals are recognized by export receptors. Import and export receptors are...
4.6K
DNA Packaging
102.5K
Overview
102.5K
Forces Acting on Chromosomes
3.3K
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...
3.3K


