相关实验视频
Updated: Jul 17, 2025
07:51
Pull-down of Calmodulin-binding Proteins
Published on: January 23, 2012
25.4K
影响Gly114的卡尔莫杜林突变会破坏与NaV1.5智商域的结合
Malene Brohus1, Ana-Octavia Busuioc1, Reinhard Wimmer1
1Department of Chemistry and Bioscience, Aalborg University, Aalborg, Denmark.
Frontiers in pharmacology
|September 4, 2023
概括
卡尔莫杜林 (CaM) 基因中的错误变异会导致心律失常. 这项研究表明,某些CaM变异会损害对NaV1.5的结合,这可能解释布鲁加达综合征和类似LQT3的特征.
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
- 离子通道病变 离子通道病变
背景情况:
- 卡尔莫杜林 (CaM) 基因中的错误变异与严重的心律失常有关,例如Catecholaminergic Polymorphic Ventricular Tachycardia (CPVT) 和长QT综合征 (LQTS).
- 在突然死亡的个体中发现了一种新型CALM2 G114R变异,表现出CaV1.2和RyR2通道的关闭受损,但表型类似于布鲁加达综合征 (BrS) 或LQT3.
研究的目的:
- 为了调查CALM2 G114R变异特异性干扰calmodulin与NaV1.5通道的结合的假设.
- 为了确定不同类型的calmodulin在不同度的NaV1.5结合亲和力上的影响.
主要方法:
- 生物化学试验被用来评估calmodulin变体 (G114R,G114W,N98S,I10T) 与NaV1.5智商域的结合亲和力.
- 在一系列 (Ca2+) 度范围内测量了结合亲和力.
主要成果:
- 卡尔莫杜林与NaV1.5智商域的结合受到G114R和G114W变体的严重影响,特别是在低到中等的Ca2+度下 (减少50倍以上).
- 节律失调的N98S变体仅在4μM Ca2+时显示出NaV1.5结合的轻微减少 (1.5倍),而非节律失调的I10T变体没有任何影响.
- 这些发现表明,特定的CaM变体和NaV1.5之间的减少相互作用可能会改变心脏电流 (INa).
结论:
- 某些卡尔莫杜林变体显著降低了与NaV1.5的结合,这可能解释了以前与卡尔莫杜林病变无关的BrS和LQT3表型.
- 卡尔莫杜林病的表型谱可能需要扩展,包括布鲁加达综合征和LQT3类特征.
关键词:
NaV1.5 和 NaV1.5 是不同的.这是SCN5A.发生心律失常的arrhythmogenic卡尔莫杜林是一种卡尔莫杜林.卡尔莫杜林的目标结合.镇静分子病变 (calmodulinopathy) 是一种调节心脏的离子通道调节实验变体解释的解释更多相关视频
13:40Live Cell Calcium Imaging Combined with siRNA Mediated Gene Silencing Identifies Ca2+ Leak Channels in the ER Membrane and their Regulatory Mechanisms
Published on: July 7, 2011
18.2K
15:28Mutagenesis and Functional Analysis of Ion Channels Heterologously Expressed in Mammalian Cells
Published on: October 1, 2010
17.5K
相关概念视频
01:16Calmodulin-dependent Signaling
5.2K
Calmodulin (CaM) is a calcium-binding protein in eukaryotes that controls various calcium-regulated cellular processes. It has four calcium-binding sites that bind calcium to form the calcium-calmodulin ( Ca2+-CaM) complex. GPCR stimulation increases the calcium levels in the cells that bind to CaM and induces a conformational change.
The Ca2+-CaM complex does not have enzymatic activity by itself. Instead, the complex binds downstream target proteins, including membrane proteins or enzymes,...
The Ca2+-CaM complex does not have enzymatic activity by itself. Instead, the complex binds downstream target proteins, including membrane proteins or enzymes,...
5.2K
01:19Ligand-gated Ion Channels
12.4K
Ligand-gated ion channels are transmembrane proteins with a channel for ions to pass through and a binding site for a ligand. The channel opens only when a ligand attaches to the binding site.
Three Subfamilies of Ligand-gated Ion Channels
Ligand-gated ion channels fall into three subfamilies. The 'Cys-loop' includes the nicotinic acetylcholine receptors, γ-aminobutyric acid (GABA), glycine, and 5-hydroxytryptamine receptors. The second one is the 'Pore-loop' channels that...
Three Subfamilies of Ligand-gated Ion Channels
Ligand-gated ion channels fall into three subfamilies. The 'Cys-loop' includes the nicotinic acetylcholine receptors, γ-aminobutyric acid (GABA), glycine, and 5-hydroxytryptamine receptors. The second one is the 'Pore-loop' channels that...
12.4K
01:30Ligand-Gated Ion Channel Receptor: Gating Mechanism
2.3K
Ligand-gated ion channels are transmembrane proteins that play a vital role in intercellular communication and functions of the nervous system. They allow the influx of ions across the membrane once the neurotransmitter binds, allowing the subsequent transmission of electrical excitation across the neurons. Other ligand-gated ion channels, like the γ-aminobutyric acid (GABA) receptor, permit anions like chloride into the cells on the binding of the GABA molecule. Their entry into the cell...
2.3K