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相关概念视频

Lysosomes01:31

Lysosomes

26.2K
Lysosomes are membrane-enclosed spherical sacs derived from the Golgi apparatus. The most important function of the lysosome is degrading macromolecules and biological polymers that are released during membrane trafficking events such as the secretory, endocytic, autophagic, and phagocytic pathways. The degradation is carried out by several hydrolytic enzymes active in an acidic environment of the lysosomal lumen. These acid hydrolases are involved in cellular processes such as cell signaling,...
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Translation01:31

Translation

156.4K
Lesson: Translation
Translation is the process of synthesizing proteins from the genetic information carried by messenger RNA (mRNA). Following transcription, it constitutes the final step in the expression of genes. This process is carried out by ribosomes, complexes of protein and specialized RNA molecules. Ribosomes, transfer RNA (tRNA), and other proteins produce a chain of amino acids—the polypeptide—as the end product of translation.
Translation Produces the Building Blocks of...
156.4K
Translation01:31

Translation

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Translation is the process of synthesizing proteins from the genetic information carried by messenger RNA (mRNA). Following transcription, it constitutes the final step in the expression of genes. This process is carried out by ribosomes, complexes of protein and specialized RNA molecules. Ribosomes, transfer RNA (tRNA), and other proteins produce a chain of amino acids—the polypeptide—as the end product of translation.
Translation Produces the Building Blocks of Life
Proteins are...
17.8K
Lysosomal Hydrolases01:22

Lysosomal Hydrolases

4.6K
Lysosomes are the site for the degradation of macromolecules and biological polymers released during membrane trafficking events such as secretory, endocytic, autophagic, and phagocytic pathways. The membrane-enclosed area of the lysosome, called the lumen, contains hydrolytic enzymes active in an acidic environment. These acid hydrolases are functional at a pH between 4.5 and 5 and are involved in cellular processes such as cell signaling, energy metabolism, restoration of the plasma membrane,...
4.6K
Initiation of Translation02:33

Initiation of Translation

39.0K
Initiating translation is complex because it involves multiple molecules. Initiator tRNA, ribosomal subunits, and eukaryotic initiation factors (eIFs) are all required to assemble on the initiation codon of mRNA. This process consists of several steps that are mediated by different eIFs.
First, the initiator tRNA must be selected from the pool of elongator tRNAs by eukaryotic initiation factor 2 (eIF2). The initiator tRNA (Met-tRNAi) has conserved sequence elements including modified bases at...
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Termination of Translation01:44

Termination of Translation

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The large ribosomal subunit has several important structures essential to translation. These include the peptidyl transferase center (PTC) - which is the site where the peptide bond is formed - and a large, internal, water-filled tube through which the nascent polypeptide moves. This latter structure is called the Peptide Exit Tunnel, and it begins at the PTC and spans the body of the large ribosomal subunit. During translation, as the nascent polypeptide chain is synthesized, it passes through...
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基准测试溶酶体丰富方法:研究和临床翻译指南.

Anniek L de Jager1, Sara Kassem1, Louis Alesha1

  • 1Department of Immunology, Leiden University Medical Center (LUMC), Leiden 2333ZA, The Netherlands.

Analytical chemistry
|February 3, 2026
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概括

通过比较四种溶酶体丰富方法,这项研究发现基于梯度和基于珠子的技术为蛋白质组学带来了最纯粹的结果. 亚细胞分化提供了更高的产量,但有污染,而基于过的方法是快速的,但产生非完好无损的溶解体.

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科学领域:

  • 细胞生物学 细胞生物学
  • 生物化学 生物化学
  • 蛋白质组学是指蛋白质组学.

背景情况:

  • 溶解体是细胞功能和疾病发病过程中的关键器官.
  • 低 lysosome 丰度需要丰富,以进行有效的下游分析,特别是蛋白质组学.
  • 现有的溶酶体隔离方法缺乏系统的,多模式的性能比较.

研究的目的:

  • 系统地对四种常见的溶酶体丰富技术进行基准测试.
  • 评估基于产量,纯度,膜完整性,可重复性,可扩展性和交叉污染的方法.
  • 为研究和临床应用提供选择最佳溶酶体丰富策略的指导.

主要方法:

  • 使用THP-1细胞对四种溶酶体丰富技术 (梯度基,过基,珠基,亚细胞分离) 的基准测试.
  • 采用纳米粒子跟踪分析,电子显微镜,流细胞计,西式涂抹和基于质谱的蛋白质组学的多模式评估.
  • 评估关键性能指标,包括产量,纯度,完整性,可重复性,可扩展性和污染.

主要成果:

  • 基于梯度和基于珠子的方法显示出优异的溶酶体丰富度和蛋白质纯度.
  • 亚细胞分离产生了更高的溶酶体数量,但表现出更高的变异性和污染.
  • 基于过的方法允许快速处理,但主要是隔离具有显著交叉污染的不完整的溶解体.

结论:

  • 溶酶体丰富方法之间存在显著的性能差异,影响下游分析.
  • 建议基于梯度和基于珠子的方法用于高纯度的溶酶体蛋白质组学.
  • 这项研究强调了对 lysosomal 研究严格验证的重要性,指导基于具体目标的方法选择.