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相关概念视频

Indicators02:39

Indicators

Certain organic substances change color in dilute solution when the hydronium ion concentration reaches a particular value. For example, phenolphthalein is a colorless substance in any aqueous solution with a hydronium ion concentration greater than 5.0 × 10−9 M (pH < 8.3). In more basic solutions where the hydronium ion concentration is less than 5.0 × 10−9 M (pH > 8.3), it is red or pink. Substances such as phenolphthalein, which can be used to determine the pH of a solution, are called...
Ion-Exchange Chromatography01:09

Ion-Exchange Chromatography

Ion-exchange chromatography, or IEC, is a technique for separating ions based on their affinity for the stationary phase. The stationary phase is a cross-linked polymer resin with covalently attached ionic functional groups. The functional groups can be either positively charged (cation exchangers) or negatively charged (anion exchangers). A cation exchanger consists of a polymeric anion and active cations, while an anion exchanger is a polymeric cation with active anions. The choice of...

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相关实验视频

Updated: Jun 19, 2026

A Fluorescent Screening Assay for Identifying Modulators of GIRK Channels
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高性能化学遗传离子指示器

Dazhou Cheng1, Zhenlin Ouyang2, Xiaoyu He3

  • 1Department of Chemistry, Graduate School of Science, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan.

Journal of the American Chemical Society
|November 27, 2024
PubMed
概括
此摘要是机器生成的。

研究人员开发了新的红色光离子 (K+) 指标,称为HaloKbp1.1. 这些基因可定位的传感器具有高的特异性和亮度,可以检测细胞K+变化,例如来自BK通道活动的变化.

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High-throughput Screening for Small-molecule Modulators of Inward Rectifier Potassium Channels
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Making, Testing, and Using Potassium Ion Selective Microelectrodes in Tissue Slices of Adult Brain
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相关实验视频

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科学领域:

  • 生物化学和分子生物学
  • 细胞生理学 细胞生理学
  • 光探测器和成像仪

背景情况:

  • 离子 (K+) 对细胞功能至关重要,因此精确的测量至关重要.
  • 现有的光K+指标缺乏遗传向性,高特异性或红色/远红色发射.
  • 生物研究需要先进的K+传感器,具有更好的性能特征.

研究的目的:

  • 开发用于细胞内离子 (K+) 检测的新型化学遗传光指标.
  • 创建具有高特异性的K+对离子 (Na+) 的指标.
  • 为了实现具有高亮度和红色到远红色光谱中的大量光变化的指标.

主要方法:

  • 通过将细菌的K+结合蛋白 (Kbp) 与HaloTag7.7融合,设计了一系列化学遗传K+指标 (HaloKbp1).
  • 嵌入了对环境敏感的罗达胺衍生物,用于光信号.
  • 在检测生理学上相关的K+度变化时的验证指标性能.

主要成果:

  • HaloKbp1系列在红色到远红色波长范围内表现出高亮度.
  • 这些指标显示出很大的强度计光变化和可调节的解离常数 (Kd).
  • 成功检测到与Ca2+激活BK通道活性相关的K+度变化.

结论:

  • HaloKbp1系列代表了K+指示器技术的重大进步.
  • 这些指标适用于基因向和可视化生物系统中的K+动态.
  • 开发的传感器为研究细胞电生理学和信号通路提供了宝贵的工具.