相关实验视频
Updated: Jul 28, 2025

08:57
Aip1p Dynamics Are Altered by the R256H Mutation in Actin
Published on: July 30, 2014
8.0K
与心肌病相关的变体改变了α-actinin-2actin-binding域的结构和功能
Alexandra E Atang1, Robyn T Rebbeck2, David D Thomas2
1Department of Chemistry, Oakland University, Rochester, MI, 48309-4479, USA.
Biochemical and biophysical research communications
|June 4, 2023
概括
在ACTN2的遗传变异影响心肌功能. 这项研究揭示了α-actinin-2中的特定突变如何改变actin结合,从而导致诸如高性心肌病等心肌病.
科学领域:
- 心血管遗传学 心血管遗传学
- 分子心脏病学分子心脏病学
- 蛋白质生物化学 蛋白质生物化学
背景情况:
- 增高性心肌病 (HCM),扩张性心肌病 (DCM) 和限制性心肌病 (RCM) 是心肌病导致心力衰竭和心脏突然死亡.
- 编码α-actinin-2的ACTN2基因变异在心肌病患者中越来越多地被发现.
- 对ACTN2变异的功能数据和疾病机制在很大程度上仍未被探索.
研究的目的:
- 为了研究三种与HCM相关的ACTN2变体 (A119T,M228T,T247M) 在actin结合域 (ABD) 中的功能后果.
- 为了确定这些变异是否影响蛋白质结构,稳定性和活性蛋白结合亲和力.
- 阐明将ACTN2变异与心肌病相关联的潜在致病机制.
主要方法:
- 循环二重化谱法用于评估突变α-actinin-2 ABD蛋白质的折叠状态.
- 热变性研究,以评估突变蛋白质的稳定性.
- 动氨酸结合试验用于量化变异对α-actinin-2与actin相互作用的影响.
主要成果:
- 发现突变的ABD蛋白质折叠得很好,但稳定性降低,表明结构中断.
- 而A119T变种显著降低了与actin结合的亲和力.
- M228T和T247M变体导致了增加的动因结合亲和力.
结论:
- 与心肌病相关的ACTN2变体可以改变蛋白质稳定性和活性蛋白结合.
- 通过α-actinin-2对失调的活性蛋白结合是 HCM,DCM 和 RCM 的潜在机制.
- 这些发现强调了α-actinin-2actin结合域在心脏功能和疾病中的重要性.
相关概念视频
Actin Polymerization and Cell Motility
5.3K
Actin is a family of globular proteins that are highly abundant in eukaryotic cells. It makes up approximately 1-5% of total cell protein concentration. Actin monomers polymerize to form a complex network of polarized filaments, the actin cytoskeleton, that plays a crucial role in many cellular processes, including cell motility, division, endocytosis, and metastasis of cancer cells.
Actin cytoskeleton dynamics can produce pushing, pulling, and resistance forces that help the cell to migrate....
Actin cytoskeleton dynamics can produce pushing, pulling, and resistance forces that help the cell to migrate....
5.3K
Cardiomyopathy III: Hypertrophic Cardiomyopathy
17
Hypertrophic cardiomyopathy, or HCM, is an autosomal dominant genetic disorder characterized by asymmetric left ventricular hypertrophy without ventricular dilation. It is more common in men and is typically diagnosed in young, athletic adults.EtiologyHCM is primarily genetic and is caused by mutations in genes encoding sarcomeric proteins. Researchers have identified over 1400 mutations across at least 11 different genes. Among these, the most frequently occurring mutations are found in the...
17
Cardiomyopathy I: Introduction and Classification
23
Cardiomyopathy, or CMP, is a group of diseases affecting the myocardial structure, impairing its ability to pump blood effectively. This condition can lead to arrhythmias, heart failure, or sudden cardiac death.Cardiomyopathies are classified into primary and secondary categories:Primary Cardiomyopathy refers to conditions involving only the heart muscle that are often idiopathic (of unknown cause) or genetic. They primarily affect the myocardium without the involvement of other systemic...
23
Introduction to Actin
5.2K
Actin is a highly conserved cytoskeletal protein found abundantly in eukaryotic cells. It constitutes 10% weight of the total cellular protein in muscle cells, while in non-muscle cells, it is lower and makes up around 1–5 percent of the total cell protein. Actin found in the unicellular amoebae and complex multicellular animals is around 80% similar, demonstrating their conservation over a billion years of evolution. Actin coding genes are conserved within species and across...
5.2K
Cardiomyopathy II: Dilated Cardiomyopathy
12
Dilated cardiomyopathy, or DCM, is a progressive myocardial disorder characterized by ventricular chamber dilation and contractile dysfunction.EtiologyVarious factors can cause DCM, including hypertension and heavy alcohol intake, which contribute to the weakening and enlargement of the heart muscle. Viral infections, such as Coxsackievirus B, adenoviruses, and influenza, can lead to DCM by causing inflammation and damage to heart tissue. Certain chemotherapeutic agents, including daunorubicin,...
12
ATP Synthase: Mechanism
14.8K
In animals, the mitochondrial F1F0 ATP synthase is the key protein that synthesizes ATP molecules through a complex catalytic mechanism. While the nuclear genome encodes the majority of ATP synthase subunits, the mitochondrial genome encodes some of the enzyme's most critical components. The formation of this multi-subunit enzyme is a complex multi-step process regulated at the level of transcription, translation, and assembly. Defects in one or more of these steps can result in decreased...
14.8K

