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相关概念视频

Cryo-electron Microscopy01:28

Cryo-electron Microscopy

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Conventional electron microscopy (EM) involves dehydration, fixation, and staining of biological samples, which distorts the native state of biological molecules and results in several artifacts. Also, the high-energy electron beam damages the sample and makes it difficult to obtain high-resolution images. These issues can be addressed using cryo-EM, which uses frozen samples and gentler electron beams. The technique was developed by Jacques Dubochet, Joachim Frank, and Richard Henderson, for...
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Updated: Sep 11, 2025

"Cell Surface Capture" Workflow for Label-Free Quantification of the Cell Surface Proteome
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对于冷保存的细胞和组织样本的微尺度细胞表面蛋白质学.

John R Thorup1, Sarah A Johnston2, Moe Haines1

  • 1Broad Institute of MIT and Harvard, Cambridge, MA, USA.

bioRxiv : the preprint server for biology
|August 12, 2025
PubMed
概括

优化的表面蛋白质组学工作流可以从低输入和冷保存样本中准确识别细胞表面蛋白 (CSP),从而使在翻译研究中发现生物标志物.

关键词:
细胞表面蛋白质组学在N-glycoproteome中,它们具有N-glycoproteome的作用.蛋白质组学是指蛋白质组学.

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科学领域:

  • 蛋白质组学是指蛋白质组学.
  • 细胞生物学 细胞生物学
  • 生物标志物发现发现

背景情况:

  • 细胞表面蛋白 (CSP) 对细胞功能至关重要,是诊断和治疗的关键目标.
  • 从有限的或冷保存的临床样本分析CSP是具有挑战性的,因为技术上的局限性,如薄膜完整性和高背景噪音.

研究的目的:

  • 优化和比较两个表面丰富策略用于细胞表面蛋白质分析.
  • 在低输入样本上评估这些方法,包括新鲜,冷保存和分离组织.
  • 为了在翻译研究环境中实现强大的表面性质表征.

主要方法:

  • 基于氧化N-糖蛋白捕获和WGA-HRP近距离标签的系统比较.
  • 适用于低输入细胞系 (A549,KMS-12-BM) 和组织样本 (子宫内膜).
  • 在新鲜和冷保存样品之间的可重复性验证.

主要成果:

  • 在低输入场景中,N-glycopeptide捕获显示出更高的特异性;WGA-HRP确定了互补的CSP.
  • 总共识别了700多个CSP,每个协议都有约175个独特的CSP.
  • 这两种方法都显示出高可重现性 (皮尔森相关性>0.9) 并检测出EGFR内部化.
  • 从冷保存,酶分离子宫内膜中的200万个细胞中成功进行CSP分析.

结论:

  • 优化的工作流程为低输入和冷保存样品提供了强大的细胞表面和一些特征.
  • 这些方法克服了翻译研究中常见的局限性,促进生物标志物发现和患者分层.
  • 该研究验证了对不同临床样本类型的互补表面丰富策略.