针对细胞表面近距离标记和电子显微镜的LaccID的定向演化
Song-Yi Lee1,2,3, Heegwang Roh4,5, David Gonzalez-Perez6
1Department of Genetics, Stanford University, Stanford, CA, USA.
Nature chemical biology
|August 1, 2025
概括
研究人员开发了LaccID,这是一种用于细胞成像和标记的新型酶,用氧取代有毒的H2O2. 这种酶映射细胞表面蛋白质,并可视化活细胞和固定细胞中的细胞结构.
科学领域:
- 生物化学 生物化学
- 细胞生物学 细胞生物学
- 生物技术是生物技术.
背景情况:
- 氧化芳香基质的酶用于近距离标记和电子显微镜.
- 现有的方法通常需要有毒的过氧化 (H2O2).
- 对于基于细胞的应用,需要更安全,更通用的酶系统.
研究的目的:
- 在哺乳动物细胞中引入多铜氧化酶 (laccases) 作为一种用于近距离标记和电子显微镜的新酶类.
- 开发和表征LaccID,一种用于细胞表面应用的定向进化衍生的laccase.
- 为了证明LaccID在绘制细胞蛋白质组和可视化细胞结构方面的实用性.
主要方法:
- 针对真菌乳酶的定向进化,以产生LaccID.
- 基于LaccID的近距离标记与质谱学相结合.
- 作为电子显微镜 (EM) 可视化基因标签的LaccID.
- 在活体和固定哺乳动物细胞和大脑中测试LaccID活性.
主要成果:
- 拉基德利用O2催化芳香基质的氧化,避免有毒的H2O2.2.
- LaccID在活细胞和固定细胞的血膜上表现出选择性活性.
- LaccID成功地绘制了与瘤细胞相互作用的T细胞的变化表面蛋白质.
- 在哺乳动物细胞和的大脑中,LaccID启用了细胞表面特征的EM可视化.
结论:
- LaccID代表了一种新的,无毒的酶替代品,用于近距离标记和EM.
- 该酶的细胞表面定位和O2依赖活性为生物研究提供了优势.
- 对于未来的基于细胞的技术和成像应用,LaccID具有很大的潜力.
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