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相关概念视频

Enzymes02:34

Enzymes

Inside living organisms, enzymes act as catalysts for many biochemical reactions involved in cellular metabolism. The role of enzymes is to reduce the activation energies of biochemical reactions by forming complexes with its substrates. The lowering of activation energies favor an increase in the rates of biochemical reactions.
Enzyme deficiencies can often translate into life-threatening diseases. For example, a genetic abnormality resulting in the deficiency of the enzyme G6PD...
Introduction to Mechanisms of Enzyme Catalysis01:13

Introduction to Mechanisms of Enzyme Catalysis

For many years, scientists thought that enzyme-substrate binding took place in a simple "lock-and-key" fashion. This model stated that the enzyme and substrate fit together perfectly in one instantaneous step. However, current research supports a more refined view scientists call induced fit. The induced-fit model expands upon the lock-and-key model by describing a more dynamic interaction between enzyme and substrate. As the enzyme and substrate come together, their interaction causes a mild...
Amplifying Signals via Enzymatic Cascade01:22

Amplifying Signals via Enzymatic Cascade

When a ligand binds to a cell-surface receptor, the receptor's intracellular domain changes shape, which may either activate its enzyme function or allow its binding to other molecules. The initial signal is amplified by most signal transduction pathways. This means that a single ligand molecule can activate multiple molecules of a downstream target. Proteins that relay a signal are most commonly phosphorylated at one or more sites, activating or inactivating the protein. Kinases catalyze the...

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相关实验视频

Updated: Jun 27, 2026

Assaying Protein Kinase Activity with Radiolabeled ATP
08:05

Assaying Protein Kinase Activity with Radiolabeled ATP

Published on: May 26, 2017

调整一个三组分反应,以捕获酶基质复合物.

Alexander V Statsuk1, Dustin J Maly, Markus A Seeliger

  • 1Howard Hughes Medical Institute, Department of Cellular and Molecular Pharmacology, University of California, San Francisco, California 94107, USA.

Journal of the American Chemical Society
|December 5, 2008
PubMed
概括

研究人员开发了一种新的化学交叉链接方法来识别未知的蛋白质激酶. 这种技术可以在复杂的细胞环境中选择性向激酶,从而推动了蛋白质组研究.

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相关实验视频

Last Updated: Jun 27, 2026

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08:05

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Published on: May 26, 2017

Characterization at the Molecular Level using Robust Biochemical Approaches of a New Kinase Protein
11:23

Characterization at the Molecular Level using Robust Biochemical Approaches of a New Kinase Protein

Published on: June 30, 2019

Identification of Kinase-substrate Pairs Using High Throughput Screening
11:13

Identification of Kinase-substrate Pairs Using High Throughput Screening

Published on: August 29, 2015

科学领域:

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

背景情况:

  • 识别上游蛋白激酶对于理解蛋白质组中的酸化事件至关重要.
  • 目前用于研究酶基质相互作用的化学方法在复杂的生物样本中面临着特异性的挑战.

研究的目的:

  • 开发一种选择性化学交联策略,用于在细胞溶解物中识别蛋白激酶及其基质.
  • 为了克服与早期交叉连接剂相遇的非特异反应的局限性.

主要方法:

  • 设计了一种由三组分组成的化学反应,以共价连接基质-激酶复合体.
  • 通过用一种激酶抑制剂支架替换腺素部分,并用一种 thiophene-2,3-dicarboxaldehyde替换o-phthaldialdehyde来修改交叉连接器.
  • 修改后的交叉链接器在有竞争性细胞蛋白质存在时被测试其有能力选择性向蛋白激酶的能力.

主要成果:

  • 最初的交叉链接器 (1) 在复杂的细胞环境中显示了非特异性的副作用.
  • 对交叉链接器的结构修改显著提高了其对蛋白质激酶的选择性.
  • 优化的交叉链接器成功地实现了含有囊的基质与细胞溶解物中相应的激酶之间的共价交叉链接.

结论:

  • 修改后的化学交叉链接器提供了一种高度选择性的方法来识别蛋白质激酶.
  • 这种方法有助于发现参与酸化的以前未知的上游激酶.
  • 该研究推进了蛋白质组分析和酶基质映射的技术.