通过空间限制的酶标记来绘制活细胞中线粒体的蛋白质组映射
Hyun-Woo Rhee1, Peng Zou1, Namrata D Udeshi2
1Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
Science (New York, N.Y.)
|February 2, 2013
概括
研究人员开发了一种新的方法,利用基因可向的过氧化酶绘制活细胞中的内源蛋白. 这项技术提供了时空蛋白质地图,识别了495个线粒体矩阵蛋白质,并揭示了新的细胞洞察力.
科学领域:
- 细胞生物学 细胞生物学
- 蛋白质组学是指蛋白质组学.
- 生物化学 生物化学
背景情况:
- 显微镜可以提供时空数据,但仅限于少数重组蛋白.
- 质谱法 (MS) 可以识别成千上万的内源蛋白质,但需要溶解样本.
- 在分析活细胞内源性蛋白质定位和动态方面存在差距.
研究的目的:
- 开发一种技术,以创造活细胞内内源性蛋白质的空间和时间解析的蛋白质组图.
- 结合显微镜和质谱学的优势,进行细胞蛋白质组分析.
- 在体内研究人类线粒体矩阵的蛋白质组合.
主要方法:
- 利用一种基因可向的过氧化酶用于活细胞内源性蛋白质的靠近依赖生物化.
- 采用质谱仪来净化和识别生物化蛋白质.
- 使用电子显微镜验证的蛋白质组发现用于亚细胞局部化.
主要成果:
- 成功地绘制了人类线粒体矩阵内的内源性蛋白质,确定了495种蛋白质.
- 发现了31种以前与线粒体无关的蛋白质.
- 证明了特殊的标记特异性,区分了不同线粒体区 (矩阵与膜间空间) 中的蛋白质.
- 根据蛋白质组数据和显微镜确认,重新分配了几种蛋白质,包括原型氨基酸氧化酶,到线粒体矩阵中.
结论:
- 开发的过氧化酶介导蛋白质组映射技术提供了活细胞内源性蛋白质前所未有的空间和时间分辨率.
- 这种方法克服了传统显微镜和质谱学的局限性,为细胞生物学研究提供了强大的工具.
- 这些发现显著提升了我们对线粒体蛋白质组合和蛋白质定位的理解.
相关概念视频
01:19Protein Dynamics in Living Cells
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...
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...
01:19Translocation of Proteins into the Mitochondria
Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
Sorting of outer membrane proteins:
Mitochondrial outer membrane proteins are of two types: the transmembrane, beta-barrel porins, and the membrane-anchored, alpha-helical proteins. Beta-barrel porin precursors are translocated by the TOM complex and inserted into the outer mitochondrial membrane by the SAM complex. In contrast,...
Sorting of outer membrane proteins:
Mitochondrial outer membrane proteins are of two types: the transmembrane, beta-barrel porins, and the membrane-anchored, alpha-helical proteins. Beta-barrel porin precursors are translocated by the TOM complex and inserted into the outer mitochondrial membrane by the SAM complex. In contrast,...
01:33Proteomics
A proteome is the entire set of proteins that a cell type produces. We can study proteomes using the knowledge of genomes because genes code for mRNAs, and the mRNAs encode proteins. Although mRNA analysis is a step in the right direction, not all mRNAs are translated into proteins.
Proteomics is the study of proteomes' function. It involves the large-scale systematic study of the proteome to denote the protein complement expressed by a genome. Scientist Mark Wilkins coined the term proteomics...
Proteomics is the study of proteomes' function. It involves the large-scale systematic study of the proteome to denote the protein complement expressed by a genome. Scientist Mark Wilkins coined the term proteomics...