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Calmodulin-dependent Signaling

Calmodulin-dependent Signaling

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,...

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相关实验视频

Updated: Jul 2, 2025

Imaging Local Ca2+ Signals in Cultured Mammalian Cells

Imaging Local Ca2+ Signals in Cultured Mammalian Cells

Published on: March 3, 2015

实时单分子成像对CaMKII-calmodulin相互作用的实时成像

Shahid Khan¹, Justin E Molloy², Henry Puhl³

¹Molecular Biology Consortium at Lawrence Berkeley National Laboratory, Berkeley, California.

Biophysical journal

|February 28, 2024

概括

/卡尔莫杜林 (CAM) 与/卡尔莫杜林依赖的蛋白激酶II (CaMKII) 结合是依赖ATP的,影响其亲和力和功能. 这项研究揭示了CaMKII.

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相关实验视频

Last Updated: Jul 2, 2025

Imaging Local Ca2+ Signals in Cultured Mammalian Cells

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Published on: March 3, 2015

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Published on: April 10, 2013

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Published on: March 15, 2018

科学领域:

生物化学和分子生物学
神经科学是一个神经科学.
细胞信号传递细胞信号传递

背景情况:

/卡尔莫杜林依赖蛋白激酶II (CaMKII) 在细胞信号通路中起着至关重要的作用.
CaMKII激活涉及/卡尔莫杜林 (CAM) 结合和依赖ATP的自酸化,从而增强CAM亲和力.
了解CAM与CaMKII关联的精确机制,特别是其ATP依赖,对于破译其调节功能至关重要.

研究的目的:

通过单分子成像来研究CAM与CaMKIIβ异型相关的ATP依赖性.
阐明CaMKII二分化和特定酸化位在调节CAM结合亲缘关系中的作用.
为了比较野生型CaMKII在不同的ATP条件下与各种突变物的行为.

主要方法:

单分子全内部反射光显微镜 (TIRFm) 观察罗达胺-CAM与金星-CaMKIIβ的相关性.
高分辨率 (0.5秒) 追踪CAM结合和解离事件.
在CAM占用率与CAM占用率同时进行点光漂白,以确定CaMKII全酶静电测量.
使用了酸化缺陷,ATP结合受损和相仿 CaMKII 突变物.

主要成果:

取决于ATP的CAM与CaMKII的结合需要为α和β异型形成二元体.
CaMKII突变显示了CAM结合的不同低和高亲和状态,由ATP和酸化调节.
野生类型的CaMKII在ATP中表现出低和高亲和度状态的双模分布,与此前发表的体外分析不同.
相像突变 (T287D) 显示出明显更高的CAM亲和力,而ATP结合受损的突变显示出减少的亲和力.

结论:

在依赖ATP的方式,CaMKII全酶结构,二分化和酸化状态关键调节CAM结合亲和力.
在野生类型的CaMKII中观察到的双模分布表明CAM协会的复杂体内调节.
这些发现突出了测试条件如何影响CaMKII激活和抑制的感知平衡,从而影响体内激酶功能.