関連する実験動画
Updated: Feb 13, 2026
10:24
Visualization of Endoplasmic Reticulum Localized mRNAs in Mammalian Cells
Published on: December 17, 2012
14.7K
哺乳類のエンドプラズマ網膜におけるタンパク質輸送とN-グリコシレーションの結合の構造的基礎
Katharina Braunger1, Stefan Pfeffer2, Shiteshu Shrimal3
1Department of Biochemistry, Gene Center and Center for Integrated Protein Science Munich, University of Munich, 81377 Munich, Germany.
Science (New York, N.Y.)
|March 10, 2018
まとめ
研究者は,リボソーム-Sec61-オリゴサカリルトランスフェラーゼ (OST) 複合体の構造を解明し,N-グリコシレーションが内 плазмаの網膜でタンパク質合成に結びついていることを明らかにした. これは,グリコタンパク質の生体生成に関する洞察を提供します.
科学分野:
- 細胞生物学
- 構造生物学
- 生物化学
背景:
- タンパク質合成とN-グリコシレーションは重要な細胞プロセスです.
- これらのプロセスは,リボソーム,Sec61トランスロコン,オリゴサカリルトランスフェラーゼ (OST) を含む複合体を通じて,エンドプラズマの網膜に結合する.
研究 の 目的:
- ネイティブおよび溶解されたリボソーム-Sec61-OST複合体の構造を決定する.
- コトランスレーション性N-グリコシル化機構の分子構造を解明する.
主な方法:
- クリオ電子顕微鏡 (cryo-EM) のアプローチが利用されました.
- サブユニット相互作用を分析するために分子モデリングが採用されました.
主要な成果:
- リボソーム-Sec61-OST複合体の詳細な構造が得られた.
- STT3Aサブユニットの分子モデルは,OST内の統合と特異性を明らかにした.
- OSTサブユニットDC2はSec61とSTT3Aを接続するキーインターフェースモジュールとして識別されました.
結論:
- この研究は,N-グリコシライゼーションのコトランスレーション機構の詳細な構造的見解を提供します.
- この構造的洞察は,エンドプラズマ網膜におけるグリコタンパク質の生体形成のメカニズム的理解を容易にする.
関連する概念動画
01:39Endoplasmic Reticulum
111.1K
The Endoplasmic Reticulum (ER) in eukaryotic cells is a substantial network of interconnected membranes with diverse functions, from calcium storage to biomolecule synthesis. A primary component of the endomembrane system, the ER manufactures phospholipids critical for membrane function throughout the cell. Additionally, the two distinct regions of the ER specialize in the manufacture of specific lipids and proteins.
111.1K
01:43The Endoplasmic Reticulum
21.8K
The endoplasmic reticulum or ER makes up for more than half of the membranes in a cell and accounts for 10% of total cell volume. It is also the primary protein and lipid synthesis factory for most cell organelles, such as the Golgi apparatus, lysosomes, secretory vesicles, and the plasma membrane. Despite being the most extensive and functionally complex subcellular organelle, ER was the last to be discovered. After years of deliberation, Keith Porter and George Palade in the year 1954,...
21.8K
01:34Directing Proteins to the Rough Endoplasmic Reticulum
17.9K
The organelle-specific signaling sequences direct proteins synthesized in the cytosol to their final destination like ER, mitochondria, peroxisomes, etc. Some of the proteins directed to ER are then trafficked via vesicles to other organelles within the cell or the extracellular environment through the Golgi complex. For example, the rough ER synthesizes soluble proteins for transportation to the lysosomes or secretion out of the cell. It can also synthesize transmembrane proteins that can...
17.9K
01:21Smooth Endoplasmic Reticulum
8.2K
Smooth endoplasmic reticulum or smooth ER is a sub-organelle with specialized functions in animal cells and plant cells. It is often associated with the tubule morphology of the endoplasmic reticulum.
The ER provides optimal conditions for synthesizing steroid hormones and lipids, such as phospholipids and triglycerides. Traditionally, lipid metabolism was considered to be a smooth ER function. However, there is no direct evidence to prove that rough ER is completely excluded from lipid...
The ER provides optimal conditions for synthesizing steroid hormones and lipids, such as phospholipids and triglycerides. Traditionally, lipid metabolism was considered to be a smooth ER function. However, there is no direct evidence to prove that rough ER is completely excluded from lipid...
8.2K
01:25Protein Glycosylation
9.8K
Glycosylation, the most common post-translational modification for proteins, serves diverse functions. Adding sugars to proteins makes the proteins more resistant to proteolytic digestion. Glycosylated proteins can act as markers and receptors to promote cell-cell adhesion. Additionally, they have many essential quality control functions in the cell, such as correct protein folding and facilitating transport of misfolded proteins to the cytosol, which can be degraded.
Glycosylation occurs in...
Glycosylation occurs in...
9.8K
02:22Regulated mRNA Transport
7.1K
In eukaryotes, transcription and translation are compartmentalized; an mRNA is first synthesized in the nucleus and then selectively transported to the cytoplasm for protein synthesis. Before transport, a pre-mRNA undergoes several steps of post-transcriptional modifications including splicing, 5' capping, and the addition of a poly-adenine tail. Various proteins bind to the pre-mRNA during these modifications. The mRNA transport takes place with the help of multiple proteins playing...
7.1K