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Updated: Jul 14, 2026

04:49
In Vitro Nuclear Assembly Using Fractionated Xenopus Egg Extracts
Published on: September 2, 2008
核孔複合体全体に原発的に展開された核ポリンゲートタンパク質の拡散
Samir S Patel1, Brian J Belmont, Joshua M Sante
1MCD Biology, University of California Santa Cruz, Santa Cruz, CA 95064, USA.
Cell
|April 10, 2007
まとめ
核孔複合体 (NPC) は,FGドメインのヌクレオポリンを使用して,分子輸送を制御します. 凝固したFGドメインは中央ゲートを形成し,周辺のドメインは別々の障壁を作り,2ゲートのNPCモデルを明らかにします.
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.
- バイオフィジックス 生物物理学
背景:
- 核孔複合体 (NPC) は,核と細胞質の間の輸送を調節する.
- フェニララニン・グリシン (FG) モチーフを持つ核ポリン (nucleoporins) は,NPCの機能の鍵ですが,選択性における正確な役割は議論されています.
研究 の 目的:
- NPCのサイズ選択障壁におけるFGドメインの役割を調査する.
- NPC内のFGドメインの構造的組織と相互作用を明らかにする.
主な方法:
- 酵母遺伝学では,個々のFGドメインを削除します.
- FGドメインの削除時のNPCの透過性の変化の分析.
- バイオケミカルアッセイは,FGドメインの相互作用と,アルコールによるその破壊を研究するものです.
主要な成果:
- 個々のFGドメインの削除は,NPCの透過性の障壁を損なう.
- 中央のFGドメインは,アルコールによって破壊されたFGモチーフを通じて,凝固した,防水性網を形成します.
- 周辺のFGドメインは,一般的に非連結的です.
結論:
- NPCは2ゲートモデルで運営されている.
- 中央の拡散ゲートは,凝固したFG核ポリンのフィラメントによって形成されます.
- 周辺ゲートは,非凝固性のあるFG核ポリンの繊維によって形成されます.
関連する概念動画
The Nucleus
The nucleus is a membrane-bound organelle that acts as a control center in a eukaryotic cell. It contains chromosomal DNA, which controls gene expression and precisely regulates the production of proteins within the cell. In contrast, the DNA inside the mitochondria and chloroplast only carries out functions that are specific to those organelles.
Arrangement of DNA within Nucleus
The regulation of gene expression inside the nucleus is dependent on many factors, including the DNA structure. The...
Arrangement of DNA within Nucleus
The regulation of gene expression inside the nucleus is dependent on many factors, including the DNA structure. The...
Nuclear Export of mRNA
Before mRNAs are exported to the cytoplasm, it is crucial to check each mRNA for structural and functional integrity. Eukaryotic cells use several different mechanisms, collectively known as mRNA surveillance, to look for irregularities in mRNAs. Irregular or aberrant mRNA are rapidly degraded by various enzymes. If a defective mRNA escapes the surveillance, it would be translated into a protein which would either be non-functional or not function properly. One of the primary irregularities in...
Protein Diffusion in the Membrane
Proteins show rotational as well as lateral diffusion across the membrane. The lateral diffusion of proteins was confirmed through the cell fusion experiment where mouse and human cells were fused, resulting in hybrid cells. When the human and mouse cells fused, the specific membrane proteins on human and mouse cells were marked with the red and green-fluorescent markers, respectively. Initially, the red and green fluorescence was located on the respective hemisphere of the cell. As time...
Nuclear Protein Sorting
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...
The Nucleus
The nucleus is a membrane-bound organelle that acts as a control center in a eukaryotic cell. It contains chromosomal DNA, which controls gene expression and precisely regulates the production of proteins within the cell. In contrast, the DNA inside the mitochondria and chloroplast only carries out functions that are specific to those organelles.
Arrangement of DNA within Nucleus
The regulation of gene expression inside the nucleus is dependent on many factors, including the DNA structure. The...
Arrangement of DNA within Nucleus
The regulation of gene expression inside the nucleus is dependent on many factors, including the DNA structure. The...
Nuclear Export of mRNA
Before mRNAs are exported to the cytoplasm, it is crucial to check each mRNA for structural and functional integrity. Eukaryotic cells use several different mechanisms, collectively known as mRNA surveillance, to look for irregularities in mRNAs. Irregular or aberrant mRNA are rapidly degraded by various enzymes. If a defective mRNA escapes the surveillance, it would be translated into a protein which would either be non-functional or not function properly. One of the primary irregularities in...

