相关实验视频
Updated: Feb 13, 2026

05:05
A Structured Approach to Extubation in Mechanically Ventilated Rats
Published on: July 18, 2025
528
SAMD9自身抑制和病原性失调的结构机制
bioRxiv : the preprint server for biology
|February 12, 2026
概括
在SAMD9/9L蛋白中的功能获取突变通过破坏它们的自身抑制机制导致严重疾病. 结构研究揭示了这些突变如何破坏蛋白质相互作用的稳定性,导致疾病.
科学领域:
- 结构生物学 结构生物学
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
背景情况:
- SAMD9和SAMD9L (SAMD9/9L) 对于造血平衡和抗病毒防御至关重要.
- 在SAMD9/9L中发生的生殖线功能增益 (GoF) 突变与多系统性疾病和白血病倾向有关.
- 尚不清楚SAMD9/9L活性的调节机制以及致病突变的影响.
研究的目的:
- 阐明SAMD9调节的结构基础以及GoF突变引起疾病的机制.
主要方法:
- 低温电子显微镜 (cryo-EM) 用于确定不同状态的人类SAMD9的结构.
- 分析分子内相互作用和形状变化.
- 研究患者衍生突变和补偿突变的影响.
主要成果:
- SAMD9主要存在于由核酸结合寡合化域 (NOD) 和分子内相互作用稳定的封闭的,自抑制的构造中.
- 在患者中发现的GoF突变破坏了这些关键的分子内接口的稳定.
- 补偿突变可以通过重新建立中断的相互作用来恢复自身抑制.
- 确定了SAMD9的低丰度不对称二次体,具有激活必需的显著构造变化.
结论:
- 这项研究定义了SAMD9自身抑制的结构基础.
- 它解释了致病GoF突变如何破坏这种自身抑制,导致疾病.
- 研究结果提供了关于SAMD9/9L相关疾病和潜在治疗策略的见解.
相关概念视频
Mechanical Protein Functions
5.7K
Proteins perform many mechanical functions in a cell. These proteins can be classified into two general categories- proteins that generate mechanical forces and proteins that are subjected to mechanical forces. Proteins providing mechanical support to the structure of the cell, such as keratin, are subjected to mechanical force, whereas proteins involved in cell movement and transport of molecules across cell membranes, such as an ion pump, are examples of generating mechanical force.
5.7K
Antibody Structure
65.7K
Overview
Antibodies, also known as immunoglobulins (Ig), are essential players of the adaptive immune system. These antigen-binding proteins are produced by B cells and make up 20 percent of the total blood plasma by weight. In mammals, antibodies fall into five different classes, which each elicits a different biological response upon antigen binding.
The Y-Shaped Structure of Antibodies Consists of Four Polypeptide Chains
Antibodies consist of four polypeptide chains: two identical heavy...
Antibodies, also known as immunoglobulins (Ig), are essential players of the adaptive immune system. These antigen-binding proteins are produced by B cells and make up 20 percent of the total blood plasma by weight. In mammals, antibodies fall into five different classes, which each elicits a different biological response upon antigen binding.
The Y-Shaped Structure of Antibodies Consists of Four Polypeptide Chains
Antibodies consist of four polypeptide chains: two identical heavy...
65.7K
Defenses Against Pathogens and Herbivores
29.7K
Plants present a rich source of nutrients for many organisms, making it a target for herbivores and infectious agents. Plants, though lacking a proper immune system, have developed an array of constitutive and inducible defenses to fend off these attacks.
29.7K
Defense Against Bacterial Pathogens
2.9K
The human immune system is a complex network of cells, tissues, and organs that work together to defend the body against bacterial infections. It consists of various immune cells, each playing a specific role in the defense mechanism.
Phagocytes
Phagocytes are the frontline soldiers of the immune system. They include neutrophils and macrophages. Neutrophils are the most abundant type of white blood cell and are quickly mobilized to the site of infection. Macrophages are larger cells that patrol...
Phagocytes
Phagocytes are the frontline soldiers of the immune system. They include neutrophils and macrophages. Neutrophils are the most abundant type of white blood cell and are quickly mobilized to the site of infection. Macrophages are larger cells that patrol...
2.9K
Reaction Mechanisms
31.2K
Chemical reactions often occur in a stepwise fashion, involving two or more distinct reactions taking place in a sequence. A balanced equation indicates the reacting species and the product species, but it reveals no details about how the reaction occurs at the molecular level. The reaction mechanism (or reaction path) provides details regarding the precise, step-by-step process by which a reaction occurs.
For instance, the decomposition of ozone appears to follow a mechanism with two steps:
For instance, the decomposition of ozone appears to follow a mechanism with two steps:
31.2K
Structures of Solids
18.4K
Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
18.4K

