相关实验视频
Updated: May 16, 2025

10:35
Two-photon Calcium Imaging in Neuronal Dendrites in Brain Slices
Published on: March 15, 2018
10.6K
对PPEF酸酶家族的双 Ca2+传感器介导激活的结构洞察
Jia Liu1, Cang Wu2,3, Yuyang Liu1
1Shenzhen Key Laboratory for Neuronal Structural Biology, Biomedical Research Institute, Shenzhen Peking University-The Hong Kong University of Science and Technology Medical Center, Shenzhen, 518036, Guangdong, China.
Nature communications
|April 1, 2025
概括
有EF手的血清蛋白/氨酸蛋白酸酶 (PPEF) 使用离子 (Ca2+) 调节其活性. 这项研究揭示了与卡尔莫杜林结合的Ca2+如何通过解锁催化位点来激活PPEF,从而提供治疗潜力.
科学领域:
- 生物化学 生物化学
- 结构生物学 结构生物学
- 分子神经科学 分子神经科学
背景情况:
- 具有EF手的血清/氨酸蛋白酸酶 (PPEF) 是关键的保存蛋白质,参与细胞过程.
- PPEFs的失调与人类重大疾病有关,包括癌症和神经退行性疾病.
- 规范PPEF活动的精确分子机制,特别是它们通过的调节,仍然在很大程度上未被阐明.
研究的目的:
- 阐明了由卡尔莫杜林 (CaM) 和离子 (Ca2+) 调节的赛林/氨酸蛋白酸酶与EF手 (PPEF) 的结构基础.
- 了解Drosophila melanogaster视网膜退化C (RDGC) 酶的自身抑制机制和Ca2+介导的激活.
主要方法:
- 使用冷电子显微镜 (cryo-EM) 在不同的Ca2+条件下确定RDGC/CaM全酶的高分辨率结构.
- 结构分析的重点是CaM,EF手域和RDGC的扩展IQ动机之间的相互作用.
主要成果:
- 在没有Ca2+的情况下,由CaM和EF手稳定的扩展IQ动机通过阻断基质进入催化部位来自动抑制RDGC.
- 在Ca2+结合后,CaM和EF手串诱导扩展IQ动机中的显著形状重排,从而激活了酶.
- 这种由双重传感器介导的Ca2+-依赖激活机制在包括哺乳动物在内的物种中得到保护.
结论:
- 这项研究为PPEFs的Ca2+依赖激活提供了前所未有的机制性见解.
- 了解这种激活途径可以为与PPEF功能障碍相关的疾病开发有针对性的治疗策略.
- 这些发现凸显了结构动态在酶调节和疾病发病过程中的关键作用.
相关概念视频
Structure of Cadherins
3.2K
The cadherins were one of the first cell adhesion molecules discovered; the term “cadherins” is based on their calcium-dependent adhering properties. The first cadherins discovered on the epithelial, neuronal, and placental cells were named E-cadherin, P-cadherin, and N-cadherin, respectively. These classical cadherins share sequence and structural similarities. Other cadherins, including those involved in cell signaling, are grouped into non-classical cadherins. This...
3.2K
Stereoisomerism of Cyclic Compounds
8.6K
In this lesson, we delve into the role of ring conformation and its stability, which determines the spatial arrangement and, consequently, the molecular symmetry and stereoisomerism of cyclic compounds. 1,2-Dimethylcyclohexane is used as a case study to evaluate the possible number of stereoisomers. Here, given the multiple (n = 2) chiral centers, there are 2n = 4 possible configurations that lack a plane of symmetry, as the ring skeleton exists in a non-planar chair conformation. In addition,...
8.6K
Case Studies
11.5K
There are many research methods available to psychologists in their efforts to understand, describe, and explain behavior and the cognitive and biological processes that underlie it.
11.5K
Structure of Conjugated Dienes
4.7K
Introduction
Conjugated dienes are compounds characterized by the presence of alternating double and single bonds. In a conjugated system like 1,3-butadiene, the unhybridized 2p orbital on each carbon overlaps continuously, allowing the π electrons to be delocalized across the entire molecule. In contrast, this type of overlap does not occur in cumulated and isolated dienes, such as 2,3-pentadiene and 1,4-pentadiene, respectively. Instead, the π electrons remain localized between the...
Conjugated dienes are compounds characterized by the presence of alternating double and single bonds. In a conjugated system like 1,3-butadiene, the unhybridized 2p orbital on each carbon overlaps continuously, allowing the π electrons to be delocalized across the entire molecule. In contrast, this type of overlap does not occur in cumulated and isolated dienes, such as 2,3-pentadiene and 1,4-pentadiene, respectively. Instead, the π electrons remain localized between the...
4.7K
Cause and Effect
10.8K
While variables are sometimes correlated because one does cause the other, it could also be that some other factor, a confounding variable, is actually causing the systematic movement in our variables of interest. For instance, as sales in ice cream increase, so does the overall rate of crime. Is it possible that indulging in your favorite flavor of ice cream could send you on a crime spree? Or, after committing crime do you think you might decide to treat yourself to a cone?
10.8K
Node Analysis for AC Circuits
258
Consider an angioplasty system featuring a catheter equipped with a turbine, a critical tool for removing plaque deposits from coronary arteries. This intricate medical device operates using a circuit model reminiscent of a dual-node RLC circuit powered by a current-controlled voltage source.
To unravel the complexities of this system, nodal analysis is employed, a powerful technique founded on Kirchhoff's current law (KCL), which remains valid for phasors. AC circuits can effectively be...
To unravel the complexities of this system, nodal analysis is employed, a powerful technique founded on Kirchhoff's current law (KCL), which remains valid for phasors. AC circuits can effectively be...
258

