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Protein Dynamics in Living Cells01:19

Protein Dynamics in Living Cells

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Different fluorescence-based techniques are used to study the protein dynamics in living cells. These techniques include FRAP, FRET, and PET.
Fluorescent recovery after photobleaching (FRAP) is a fluorescent-protein-based detection technique used to quantify protein movement rates within the cell. This method exposes a small portion of the cell to an intense laser beam. The laser beam causes permanent photobleaching of the fluorophore-tagged proteins in the exposed region. As the bleached...
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Updated: Jul 15, 2025

Light-mediated Reversible Modulation of the Mitogen-activated Protein Kinase Pathway during Cell Differentiation and Xenopus Embryonic Development
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Light-mediated Reversible Modulation of the Mitogen-activated Protein Kinase Pathway during Cell Differentiation and Xenopus Embryonic Development

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可光切换的结合剂使内源蛋白功能的时间剖析成为可能.

Michael Westberg, Daesun Song, Vandon Duong

    bioRxiv : the preprint server for biology
    |September 25, 2023
    PubMed
    概括

    研究人员开发了可光开关的设计氨酸重复蛋白 (psDARPins),用于精确的光学控制活细胞中的蛋白质活性. 这种方法使研究人员能够以前所未有的时空分辨率研究蛋白质功能.

    科学领域:

    • 分子生物学分子生物学
    • 细胞生物学 细胞生物学
    • 生物化学 生物化学

    背景情况:

    • 研究内源性蛋白质功能需要精确的时间空间控制蛋白质活性.
    • 现有的控制合成蛋白质结合剂的方法缺乏通用性.

    研究的目的:

    • 用光学输入开发一种可通用的方法,用于使用光学输入对内源蛋白活性进行时空控制.
    • 为了创建可光切换的设计ankyrin重复蛋白 (psDARPins),用于双向光学控制.

    主要方法:

    • 设计的安基林重复蛋白 (DARPin) 脚手架的工程拓变体.
    • 融合DARPin变体与可光分解的二次Dronpa (pdDronpa),以创建psDARPins.
    • 利用蓝色光来诱导pdDronpa解离和紫色光来恢复二分化和蛋白质结合抑制.

    主要成果:

    • 证明了GFP家族蛋白质,ERK和Ras的成功光学控制.
    • 表明psDARPins可以应用于现有的DARPin结合剂.
    • 确定Ras对于EGF持续向ERK发送EGF激活后的信号至关重要.

    结论:

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  • psDARPins为内源蛋白功能的精确时空剖析提供了一种多功能和可概括的策略.
  • 这项技术为研究细胞信号通路和蛋白质相互作用提供了新的途径.