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Negative Regulator Molecules01:23

Negative Regulator Molecules

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Positive regulators allow a cell to advance through cell cycle checkpoints. Negative regulators have an equally important role as they terminate a cell’s progression through the cell cycle—or pause it—until the cell meets specific criteria.
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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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Spreading of Chromatin Modifications02:25

Spreading of Chromatin Modifications

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The histone proteins in the nucleosomes are post-translationally modified (PTM) to increase or decrease access to DNA. The commonly observed PTMs are methylation, acetylation, phosphorylation, and ubiquitination of lysine amino acids in the histone H3 tail region. These histone modifications have specific meaning for the cell. Hence, they are called "histone code". The protein complex involved in histone modification is termed as "reader-writer" complex.
Writers
The writer...
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DNA Damage can Stall the Cell Cycle02:36

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In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
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Abnormal Proliferation02:23

Abnormal Proliferation

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Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the...
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In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
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Yeast As a Chassis for Developing Functional Assays to Study Human P53
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なぜp53がアセチル化されるのか?

C Prives1, J L Manley

  • 1Department of Biological Sciences, Columbia University, New York, NY 10027, USA. clp@columbia.edu

Cell
|January 10, 2002
PubMed
まとめ
この要約は機械生成です。

腫瘍抑制タンパク質p53のアセチル化がDNA結合に不可欠ではない. この変異は,代替メカニズムを通じてp53タンパク質の機能を調節する可能性がある.

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Purification of Ubiquitinated p53 Proteins from Mammalian Cells
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関連する実験動画

Last Updated: Apr 14, 2026

Yeast As a Chassis for Developing Functional Assays to Study Human P53
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Yeast As a Chassis for Developing Functional Assays to Study Human P53

Published on: August 4, 2019

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Purification of Ubiquitinated p53 Proteins from Mammalian Cells
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科学分野:

  • 分子生物学は分子生物学である.
  • がん研究 がん研究
  • タンパク質生化学 タンパク質生化学

背景:

  • 腫瘍抑制タンパク質p53は,がんの形成を防ぐ上で重要な役割を果たします.
  • アセチル化などの翻訳後の改変は,タンパク質の機能を調節することが知られている.
  • 以前は,p53アセチル化がDNA結合活性に決定的であると考えられていた.

研究 の 目的:

  • p53アセチル化に関する最近の発見の影響を議論する.
  • DNA結合を超えてp53アセチル化の代替的調節作用を探求する.

主な方法:

  • 最近の科学文献のレビューと合成.
  • タンパク質の調節メカニズムに関する理論的議論.

主要な成果:

  • 証拠によると,p53アセチル化がDNA結合に必要でないことが示されています.
  • アセチル化によるp53調節のための代替メカニズムが提案されています.

結論:

  • 腫瘍抑制におけるp53アセチル化の役割は,再評価が必要である.
  • p53アセチレーションの非DNA結合機能を明らかにするためにさらなる研究が必要である.