関連する実験動画
Updated: May 9, 2026
11:36
In Vitro Ubiquitination and Deubiquitination Assays of Nucleosomal Histones
Published on: July 25, 2019
LIMホメオドメインの転写因子に関するウビキチン化依存コファクター交換
Heather P Ostendorff1, Reto I Peirano, Marvin A Peters
1Zentrum für Molekulare Neurobiologie Hamburg (ZMNH), Universität Hamburg, Martinistrasse 85, 20251 Hamburg, Germany.
Nature
|March 8, 2002
まとめ
リング指LIMドメイン結合タンパク質 (RLIM) は,CLIM共因子を分解に標的とし,転写因子活性切替を可能にします. このユビキチネーションに依存するメカニズムは,遺伝子調節におけるコファクター交換を説明する.
科学分野:
- 分子生物学は分子生物学である.
- 遺伝子規制 遺伝子規制
- タンパク質生化学 タンパク質生化学
背景:
- 転写因子 (TF) は,コファクター複合体との相互作用を通じて遺伝子発現を調節する.
- コファクター結合は,TFが遺伝子転写を活性化するか抑止するかを決定する.
- 規制されたコファクター交換は,TF活動を切り替えることを提案しているが,そのメカニズムは不明である.
研究 の 目的:
- 遺伝子調節におけるコファクター交換の分子メカニズムを解明する.
- LIM-HD TF活動におけるRLIMとCLIMコファクターの役割を調査する.
- RLIMがCLIMのコファクター機能にどのように影響を与えるかを特定する.
主な方法:
- RLIMの酵素活性を評価するためのウビキチンリガゼアッセイ.
- CLIMコファクターの安定性をモニタリングするためのプロテアゾーム分解測定法.
- タンパク質とタンパク質の相互作用を研究するための共免疫プレシピテーション.
主要な成果:
- RLIMは,タンパク質分解のためのCLIM共因子を標的とした,ユビキチンタンパク質リガゼとして機能する.
- RLIM媒介によるCLIM共因子のユビキチネーションは,それらの分解に不可欠である.
- RLIMとLIM-HDタンパク質のユビキチン化依存的関連は,CLIM共因子の存在で発生する.
結論:
- RLIM媒介によるCLIM共因子の分解は,調節された共因子交換のためのメカニズムを提供します.
- このプロセスにより,LIM-HD転写因子の活性が抑制と活性化の間を切り替えることができます.
- この発見は,コファクター交換による転写調節の一般的なメカニズムを示唆している.
関連する概念動画
02:16Transcription Factors
Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...
02:04Covalently Linked Protein Regulators
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.
These groups modify specific amino acids in a protein.
01:57Protein Complexes with Interchangeable Parts
Groups of proteins may form a complex where each protein in this complex has a different role in the overall execution of the complex’s function. Often some of the proteins in the complex can be replaced by a closely related variant to give a complex that contains many of the same components yet is functionally distinct.
The SCF ubiquitin ligase is a protein complex of five individual proteins. This complex attaches ubiquitin to other target proteins to mark them for degradation. In order to...
The SCF ubiquitin ligase is a protein complex of five individual proteins. This complex attaches ubiquitin to other target proteins to mark them for degradation. In order to...
02:16Transcription Factors
Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...
02:04Covalently Linked Protein Regulators
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.
These groups modify specific amino acids in a protein.
01:30General Transcription Factors
Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...