m6A改变了核糖体的动态,从而启动了mRNA的降解
Shino Murakami1, Anthony O Olarerin-George2, Jianheng Fox Liu1
1Department of Pharmacology, Weill Cornell Medicine, Cornell University, New York, NY 10065, USA.
Cell
|May 6, 2025
概括
在mRNA中的N6-甲基氨酸 (m6A) 触发了核糖体的停滞和碰撞,从而启动了mRNA的降解. 这一过程对于细胞生长和应激反应至关重要, 核糖体作为最初的m6A传感器.
科学领域:
- 分子生物学
- 核糖核酸生物学
- 表观遗传学
背景情况:
- N6-甲基氨酸 (m6A) 修饰对于细胞生长和分化等过程至关重要.
- m6A影响mRNA命运的确切机制,特别是降解,尚未完全理解.
研究的目的:
- 研究m6A对核糖体动态的影响.
- 阐明m6A诱导的核糖体行为的改变是如何调解mRNA降解的.
- 确定核糖体作为m6A介导的mRNA衰变中的初始传感器的作用.
主要方法:
- 在m6A的存在下分析核糖体动力学.
- 对核糖体停滞和碰撞事件的观察.
- 核糖体碰撞持久性与mRNA降解率的相关性.
- 对YTHDF m6A读者蛋白征集的研究.
- 对m6A-mRNA稳定性的翻译抑制影响的研究.
主要成果:
- m6A显著改变了核糖体动力学,诱导了强烈的核糖体停滞.
- m6A诱导的停滞导致与mRNA降解相关的独特核糖体碰撞.
- 发生碰撞的核糖体持续性增加增加了m6A介导的mRNA降解.
- 在核糖体停滞和碰撞后招募YTHDF读者蛋白.
- 减少核糖体停滞和碰撞稳定m6A-mRNA,有助于应激反应.
结论:
- 核糖体作为m6A修饰的主要传感器,启动mRNA降解.
- 核糖体停滞和碰撞是m6A介导的mRNA衰变中的关键机制中间体.
- 在细胞应激期间调节核糖体动力学提供了控制m6A-mRNA水平的潜在策略.
相关概念视频
Molar Mass
68.5K
The identity of a substance is defined not only by the types of atoms or ions it contains but by the quantity of each type of atom or ion. For example, water, H2O, and hydrogen peroxide, H2O2, are alike in that their respective molecules are composed of hydrogen and oxygen atoms. However, because a hydrogen peroxide molecule contains two oxygen atoms, as opposed to the water molecule, which has only one, the two substances exhibit very different properties.
68.5K
Thomson's e/m Experiment
2.9K
In a beam of charged particles created by a heated cathode, the particles move at different speeds. However, many applications need a beam with uniform particle speeds. An arrangement known as a velocity selector uses electric and magnetic fields to pick particles with a particular speed from the beam.
A particle with charge q, speed v, and mass m enters an area from the top, where the magnetic and electric fields are perpendicular both to the particle's motion and to one another. The...
A particle with charge q, speed v, and mass m enters an area from the top, where the magnetic and electric fields are perpendicular both to the particle's motion and to one another. The...
2.9K
Motional Emf
3.1K
Magnetic flux depends on three factors: the strength of the magnetic field, the area through which the field lines pass, and the field's orientation with respect to the surface area. If any of these quantities vary, a corresponding variation in magnetic flux occurs. If the area through which the magnetic field lines are passing changes, then the magnetic flux also changes. This change in the area can be of two types: the flux through the rectangular loop increases as it moves into the...
3.1K
Mass Moment of Inertia: Problem Solving
259
Knowing how to determine the moment of inertia in a wheel's axle can be invaluable in engineering and automotive applications. It provides an understanding of how changes in geometry, mass, and radius can impact its performance.
The axle can be approximated to a solid cylinder with longitudinal and perpendicular axes. Initially, a thin disc is considered parallel to the circular face of the cylinder.
The axle can be approximated to a solid cylinder with longitudinal and perpendicular axes. Initially, a thin disc is considered parallel to the circular face of the cylinder.
259
Masonry in Cold and Hot Weather Conditions
64
In cold weather, masonry construction requires specific precautions to ensure mortar does not freeze before curing, as this can significantly weaken its strength and watertightness. Mortar temperature should be maintained between 60°F and 80°F to support proper hydration and curing. Below 40°F, mortar water must be heated, but should not exceed 120°F as high temperatures can reduce mortar's compressive and bond strength.
Other key practices include keeping masonry units...
Other key practices include keeping masonry units...
64
Thermal Insulation in Masonry Walls
93
In hot, dry climates, the thermal mass of masonry walls can be beneficial, absorbing heat during the day and releasing it at night, thereby stabilizing indoor temperatures. However, in most other climates, additional insulation is necessary to enhance thermal resistance.
External insulation can be applied using an Exterior Insulation and Finish System (EIFS), which involves affixing panels of plastic foam to the wall and covering them with a polymeric stucco reinforced with glass fiber mesh....
External insulation can be applied using an Exterior Insulation and Finish System (EIFS), which involves affixing panels of plastic foam to the wall and covering them with a polymeric stucco reinforced with glass fiber mesh....
93


