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関連する概念動画

Regulated Protein Degradation02:58

Regulated Protein Degradation

9.0K
It is vital to regulate the activity of enzymatic as well as non-enzymatic proteins inside the cell. This can be achieved either through creating a balance between their rate of synthesis and degradation or regulating the intrinsic activity of the protein. Both these regulation mechanisms play an essential role in the normal functioning of cells.
Protein degradation plays two important roles in the cells. It helps to protect cells from misfolded or damaged proteins before they lead to a...
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Intralumenal Vesicles and Multivesicular Bodies01:38

Intralumenal Vesicles and Multivesicular Bodies

5.0K
Intraluminal vesicles (ILVs) are small vesicles 50-80 nm in diameter formed during the maturation of early endosomes. A specialized endosome containing numerous ILVs is called a multivesicular body (MVB). ILVs contain internalized molecules such as antigens, nucleic acids, proteins, and metabolites. Some of these molecules are released from the MVBs inside exosomes and are transported to other cells. Other MVBs contain molecules that are retained in the ILVs and are later degraded within the...
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Receptor Downregulation in MVBs01:15

Receptor Downregulation in MVBs

2.9K
Multivesicular bodies (MVBs) are mature endosomes that sort ubiquitinated proteins and then fuse with lysosomes to degrade the sorted proteins. Epidermal growth factor (EGF) and its receptor (EGFR) form a complex that can be internalized through endocytosis, sorted into an MVB, and later degraded.
The EGFR can initiate signaling pathways that  lead to cell proliferation, migration, and differentiation. Overexpression of EGFR  stimulates cells to proliferate. Excessive  EGFR...
2.9K
ER Retrieval Pathway01:45

ER Retrieval Pathway

4.9K
In the secretory pathway, vesicles transport proteins from one cellular compartment to another in forward transport to deliver the protein to its correct location. Occasionally, misfolded proteins and incorrect proteins escape their original compartments, and a retrieval pathway is used to return the escaped proteins to their original compartment.
The ER uses many checkpoints to prevent the entry of incorrectly folded or a resident protein as cargo onto a transport vesicle. These mechanisms...
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Regulation of the Unfolded Protein Response01:31

Regulation of the Unfolded Protein Response

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Inositol-requiring kinase one or IRE1 is the most conserved eukaryotic unfolded protein response (UPR) receptor. It is a type I transmembrane protein kinase receptor with a distinctive site-specific RNase activity. As the binding mechanics of the misfolded proteins with the N-terminal domain of IRE-1 are unclear, three binding models — direct, indirect, and allosteric -- are proposed for receptor activation. Nevertheless, it is known that once a misfolded protein associates with IRE1, it...
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Covalently Linked Protein Regulators02:04

Covalently Linked Protein Regulators

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Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
These groups modify specific amino acids in a protein....
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関連する実験動画

Updated: Feb 22, 2026

In Vitro Analysis of E3 Ubiquitin Ligase Function
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解読E1-E2特異性:UBA6がユビキチン結合のためのBIRC6を優先させる方法

Jiajia Wei1, Chao Xu1

  • 1MOE Key Laboratory for Cellular Dynamics, Hefei National Laboratory for Physical Sciences at the Microscale, Center for Advanced Interdisciplinary Science and Biomedicine of IHM, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, China.

Cell chemical biology
|February 20, 2026
PubMed
まとめ

ユビキチン結合酵素BIRC6は,ユビキチン活性化酵素UBA6と特異的に結合する. この研究は,この特異性とチオエステルスイッチのメカニズムを明らかにし,E1-E2酵素の階層を明確にします.

さらに関連する動画

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Functional Characterization of RING-Type E3 Ubiquitin Ligases In Vitro and In Planta

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In-vitro Reconstitution of Bacterial Ubiquitination and VCP/p97-mediated Elimination
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In-vitro Reconstitution of Bacterial Ubiquitination and VCP/p97-mediated Elimination

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関連する実験動画

Last Updated: Feb 22, 2026

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Functional Characterization of RING-Type E3 Ubiquitin Ligases In Vitro and In Planta
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In-vitro Reconstitution of Bacterial Ubiquitination and VCP/p97-mediated Elimination
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科学分野:

  • バイオケミストリー バイオケミストリー
  • 分子生物学は分子生物学である.
  • 構造生物学 構造生物学とは

背景:

  • ユビキチン-プロテアソーム系は,細胞の調節に不可欠です.
  • ウビキチン結合酵素 (E2s) とウビキチン活性化酵素 (E1s) は,このシステムの重要な構成要素である.
  • E1-E2の相互作用を理解することは,ユビキチネーション経路の解読に不可欠です.

研究 の 目的:

  • UBA6.6に対するBIRC6の特異性の背後にある分子メカニズムを解明する.
  • UBA6-BIRC6複合体の形成におけるチオエステルスイッチの役割を調査する.
  • E1-オーケストラされたE2酵素の階層の理解を広げること.

主な方法:

  • 構造生物学技術 (例えば,X線結晶学).
  • 酵素の動力学と結合を研究するための生化学的分析.
  • 重要な相互作用する残留物を特定するための変異性研究.

主要な成果:

  • BIRC6はUBA6.6に対して高い特異性を示しています.
  • この研究は,UBA6-BIRC6の承認のための構造的基礎を詳細に説明しています.
  • 重要なチオエステルスイッチメカニズムが特定され,特徴づけられました.

結論:

  • この発見は,UBA6-BIRC6の相互作用特異性についてのメカニズム的理解を提供します.
  • この研究は,ユビキチン化カスケードの重要なステップを明確にします.
  • この研究は,E1-E2の階層的な規則の理解を向上させる.