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Protein Complexes with Interchangeable Parts01:57

Protein Complexes with Interchangeable Parts

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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...
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Rab Cascades01:25

Rab Cascades

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Rab GTPases act in a regulated cascade during membrane fusion, helping the lipid bilayers mix. The Rab family of proteins are active when bound to GTP, and inactive when bound to GDP. Hence, they act as guanine nucleotide-dependent molecular switches. Rab-GTP recognizes and binds to long or short-range tethering proteins to capture the target vesicle. These tethers coordinate with SNAREs on the vesicle and the target membrane to assemble the trans SNARE complex that locks the mixing bilayers.
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Separation of Sister Chromatids02:17

Separation of Sister Chromatids

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At the transition from prophase to metaphase, there is a reduction in cohesion along the chromosomal arms, resulting in the resolution of sister chromatids. However, residual cohesin connections remain to hold the sister chromatids together until the transition from metaphase to anaphase. The residual connection prevents any premature separation of sister chromatids, blocking the risks of aneuploidy within the daughter cells.
At the onset of anaphase, separase, a proteolytic enzyme, is...
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Combinatorial Gene Control02:33

Combinatorial Gene Control

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Combinatorial gene control is the synergistic action of several transcriptional factors to regulate the expression of a single gene. The absence of one or more of these factors may lead to a significant difference in the level of gene expression or repression.
The expression of more than 30,000 genes is controlled by approximately 2000-3000 transcription factors. This is possible because a single transcription factor can recognize more than one regulatory sequence. The specificity in gene...
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Regulated Protein Degradation02:58

Regulated Protein Degradation

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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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Anaphase Promoting Complex00:50

Anaphase Promoting Complex

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The stepwise destruction of specific proteins is necessary for the progression and completion of the cell cycle. Such proteins are ubiquitinated by ubiquitin ligases and then subsequently destroyed by the proteasome. The SCF (Skp1/Cullin/F-box) and the anaphase-promoting complex (APC) are two important ubiquitin ligases involved in cell cycle progression. While SCF is active throughout the cell cycle, APC gets activated during metaphase to anaphase transition. Cdc20 or Cdh1 binds to APC and...
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補足性SCF型E3リガゼによる二重BACH1調節

Benedikt Goretzki1, Maryam Khoshouei1, Martin Schröder1

  • 1Discovery Sciences, Novartis Biomedical Research, Basel, Switzerland.

Cell
|December 10, 2024
PubMed
まとめ

この研究では,酸化ストレスと腫瘍遺伝子のレギュラーであるBACH1タンパク質が2つのユビキチンリガゼによってどのように制御されているかを明らかにしました. スイッチメカニズムにより,FBXO22またはFBXL17は構造状態に応じてBACH1と結合し,癌および酸化ストレス障害に影響を与えます.

キーワード:
BACH1 についてクリン・リング・リガゼFボックスFBXL17 についてFBXO22 についてS-ニトロシル化ヘムシステインの改変リガースイッチ酸化ストレス

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Using In Vitro Fluorescence Resonance Energy Transfer to Study the Dynamics Of Protein Complexes at a Millisecond Time Scale
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Genome-wide Mapping of Protein-DNA Interactions with ChEC-seq in Saccharomyces cerevisiae
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Monitoring Protein-RNA Interaction Dynamics In Vivo at High Temporal Resolution Using &#967;CRAC
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Using In Vitro Fluorescence Resonance Energy Transfer to Study the Dynamics Of Protein Complexes at a Millisecond Time Scale
10:50

Using In Vitro Fluorescence Resonance Energy Transfer to Study the Dynamics Of Protein Complexes at a Millisecond Time Scale

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科学分野:

  • 生物化学
  • 分子生物学
  • 細胞生物学

背景:

  • ブロードコンプレックス,トラムトラック,ブリック・ア・ブラック領域 (BTB) とCNCホモログ1 (BACH1) は,細胞酸化ストレスと腫瘍遺伝子の主要な調節体である.
  • BACH1は,SCFFBXO22およびSCFFBXL17ユビキチンリガゼによって翻訳後の調節されるが,酸化ストレス下での認識機構は不明である.

研究 の 目的:

  • FBXO22とFBXL17が酸化ストレス条件下でBACH1を認識するメカニズムを解明する.
  • BACH1の翻訳後の調節を制御するリガースイッチ機構を理解する.

主な方法:

  • BACH1 BTBダイマーとFBXO22との相互作用の構造分析
  • BACH1の安定性とリガース結合に対する癌関連変異とシステイン変化の影響を調査する.
  • FBXL17によるBACH1の認識をモノマーとして特徴づける.

主要な成果:

  • FBXO22は,BACH1 BTBダイマーのドメイン交換されたβシート内の四次性デグランを認識する.
  • 癌変異とシステイン変異は,FBXO22デグランを不安定化し,結合を損なう.
  • これらの改変により,ディマー界面で明確なデグランが露出し,FBXL17が単体BACH1と結合することを可能にします.

結論:

  • リガースイッチメカニズムは,BTBドメインの安定性に基づいて,FBXO22とFBXL17によってBACH1を調節する.
  • これらの発見は,酸化ストレス反応のメカニズム的な洞察を提供します.
  • この研究は,酸化ストレス関連疾患と癌の治療戦略を参考にすることができる.