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相关概念视频

GPI Anchoring of Proteins in the ER Membrane01:29

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GPI-anchoring is a post-translational, reversible protein modification that is ubiquitous in eukaryotes. Such proteins are primarily present on the exoplasmic leaflet of the plasma membrane.
GPI-anchor structure
A sequence of 11 enzymatic reactions results in the synthesis of the complete GPI anchor consisting of a hydrophobic and a hydrophilic portion. The hydrophobic portion comprises phosphatidylinositol, while the hydrophilic part comprises polar groups like phosphoethanolamine,...
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Helicobacter pylori, a resilient gram-negative bacterium, can thrive in the stomach's harsh, acidic environment. Infection with H. pylori leads to a cascade of events within the stomach lining. One of the critical disruptions caused by this bacterium is the interference with somatostatin production, a hormone responsible for regulating acid secretion. This interference tips the balance, escalating acid secretion and diminishing bicarbonate levels. This imbalance compromises the defensive...
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The Anchoring-and-Adjustment Heuristic01:25

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In order to make good decisions, we use our knowledge and our reasoning. Often, this knowledge and reasoning is sound and solid. However, sometimes, we are swayed by biases or by others manipulating a situation. For example, let’s say you and three friends wanted to rent a house and had a combined target budget of $1,600. The realtor shows you only very run-down houses for $1,600 and then shows you a very nice house for $2,000. Might you ask each person to pay more in rent to get the...
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Anchoring Junctions01:03

Anchoring Junctions

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Anchoring junctions are multiprotein complexes that help cells connect to other cells and the extracellular matrix. Anchoring junctions are present on the lateral and basal surfaces of cells, providing strong and flexible connections. Focal adhesions are often formed due to cell interactions with the ECM substrata, which initiate signal transduction via kinase cascades and other mechanisms. Together, they provide stability and tissue integrity. There are three types of anchoring junctions:...
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Lipids as Anchors01:32

Lipids as Anchors

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In the plasma membrane, the lipids forming the bilayer can also act as an anchor to tether proteins to the membrane. The three main types of lipid anchors found in eukaryotes are – prenyl groups, fatty acyl groups, and glycosylphosphatidylinositol or GPI groups. Prenyl and fatty acyl groups act as anchors on the cytosolic surface of the membrane, whereas GPI anchors proteins on the extracellular side.
The carboxy-terminal of most of the prenylated proteins, such as Ras proteins, contains...
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Complement System01:27

Complement System

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The complement system is a group of approximately 20 plasma proteins that strengthen the body's defenses against infections through opsonization, inflammation, and cell lysis. Opsonization involves coating pathogens with complement proteins, making them more recognizable and facilitating phagocyte engulfment. Certain complement proteins induce inflammation that attracts immune cells to the site of infection. Cell lysis involves the destruction of pathogens through the formation of a...
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相关实验视频

Updated: Feb 8, 2026

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hDOT1L将基因素甲基化与白血病发生联系起来.

Yuki Okada1, Qin Feng, Yihui Lin

  • 1Department of Biochemistry and Biophysics, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA.

Cell
|April 27, 2005
PubMed
概括
此摘要是机器生成的。

通过hDOT1L进行的质子甲基化在人类癌症中至关重要. 误导hDOT1L到Hoxa9导致MLL-AF10白血病,这表明hDOT1L是HoxA9的驱动.

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相关实验视频

Last Updated: Feb 8, 2026

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科学领域:

  • 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
  • 分子生物学分子生物学
  • 癌症研究 癌症研究

背景情况:

  • 表观遗传修饰,特别是基因组甲基化,与人类癌症的发展有关.
  • 酵母Dot1及其人类同类hDOT1L的基因甲基化影响癌症相关的基因表达.
  • hDOT1L 甲基化莱辛 79 在基因素 H3 上.

研究的目的:

  • 研究hDOT1L在MLL-AF10介导的白血病发生中的作用.
  • 为了阐明hDOT1L和AF10.0之间的相互作用.
  • 为了确定hDOT1L的甲基转移酶活性是否对白血病转化至关重要.

主要方法:

  • 使用AF10.的OM-LZ区域研究了hDOT1L和AF10之间的相互作用.
  • 创建了MLL-hDOT1L融合蛋白来评估白血病转化.
  • 在转化细胞中分析了基因表达 (例如,Hoxa9) 和基因素甲基化 (H3-K79).

主要成果:

  • hDOT1L通过OM-LZ区域与AF10相互作用,这是MLL-AF10白血病发生的关键.
  • MLL与hDOT1L的直接融合导致了依赖hDOT1L的甲基转移酶活性的白血病转化.
  • MLL-hDOT1L和MLL-AF10融合升调白血病相关基因,如Hoxa9,增加H3-K79甲基化.

结论:

  • 将hDOT1L误导到Hoxa9是MLL-AF10介导的白血病发生的一个关键机制.
  • hDOT1L的酶活性对于白血病转化至关重要.
  • hDOT1L的甲基转移酶活性代表了急性髓性白血病的潜在治疗标.