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相关概念视频

Enzyme-linked Receptors01:00

Enzyme-linked Receptors

Enzyme-linked receptors are proteins that act as both receptor and enzyme, activating multiple intracellular signals. This is a large group of receptors that include the receptor tyrosine kinase (RTK) family. Many growth factors and hormones bind to and activate the RTKs.
Neurotrophin (NT) receptors are a family of RTKs, including trkA, trkB, and trkC (tropomyosin-related kinase) receptors. TrkA is specific for nerve growth factor (NGF), neurotrophin-6, and neurotrophin-7. TrkB binds...
Master Transcription Regulators02:23

Master Transcription Regulators

Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a  complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...
Enzyme-linked Receptors01:00

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Enzyme-linked receptors are proteins that act as both receptor and enzyme, activating multiple intracellular signals. This is a large group of receptors that include the receptor tyrosine kinase (RTK) family. Many growth factors and hormones bind to and activate the RTKs.
Neurotrophin (NT) receptors are a family of RTKs, including trkA, trkB, and trkC (tropomyosin-related kinase) receptors. TrkA is specific for nerve growth factor (NGF), neurotrophin-6, and neurotrophin-7. TrkB binds...
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...
MAPK Signaling Cascades01:07

MAPK Signaling Cascades

Mitogen-activated protein kinase, or MAPK pathway, activates three sequential kinases to regulate cellular responses such as proliferation, differentiation, survival, and apoptosis. The canonical MAPK pathway starts with a mitogen or growth factor binding to an RTK. The activated RTKs stimulate Ras, which recruits Raf or MAP3 Kinase (MAPKKK), the first kinase of the MAPK signaling cascade. Raf further phosphorylates and activates MEK or MAP2 Kinases (MAPKK), which in turn phosphorylates MAP...
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相关实验视频

Updated: Jun 18, 2026

Assaying Protein Kinase Activity with Radiolabeled ATP
08:05

Assaying Protein Kinase Activity with Radiolabeled ATP

Published on: May 26, 2017

MEK的主要结构,一种蛋白质激酶,可酸化ERK基因产物.

C M Crews1, A Alessandrini, R L Erikson

  • 1Department of Cellular and Developmental Biology, Harvard University, Cambridge, MA 02138.

Science (New York, N.Y.)
|October 16, 1992
PubMed
概括
此摘要是机器生成的。

线素激活蛋白 (MAP) 激酶是关键的信号分子. 研究人员阐明了MEK1的结构,这是一个关键的上游激酶,揭示了它在MAP激酶激活中的作用以及它在大脑中的高表达.

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Characterize Disease-related Mutants of RAF Family Kinases by Using a Set of Practical and Feasible Methods
07:49

Characterize Disease-related Mutants of RAF Family Kinases by Using a Set of Practical and Feasible Methods

Published on: July 17, 2019

相关实验视频

Last Updated: Jun 18, 2026

Assaying Protein Kinase Activity with Radiolabeled ATP
08:05

Assaying Protein Kinase Activity with Radiolabeled ATP

Published on: May 26, 2017

Subcellular Fractionation for ERK Activation Upon Mitochondrial-derived Peptide Treatment
07:55

Subcellular Fractionation for ERK Activation Upon Mitochondrial-derived Peptide Treatment

Published on: September 25, 2017

Characterize Disease-related Mutants of RAF Family Kinases by Using a Set of Practical and Feasible Methods
07:49

Characterize Disease-related Mutants of RAF Family Kinases by Using a Set of Practical and Feasible Methods

Published on: July 17, 2019

科学领域:

  • 蜂信号传输是如何进行的
  • 分子生物学分子生物学
  • 生物化学 生物化学

背景情况:

  • 线素激活蛋白 (MAP) 激酶,或细胞外信号调节激酶 (ERKs),是集成各种细胞外信号的核心.
  • MAP 激酶在氨酸和氨酸残留物上迅速酸化,这表明它们在信号传导中的作用得到保护.
  • 一个关键的上游蛋白激酶激活了MAP激酶的酶活性.

研究的目的:

  • 为了阐明上游蛋白质激酶,MEK1 (MAP激酶或ERK激酶) 的结构.
  • 了解MEK1与其他已知的激酶的关系,例如Schizosaccharomyces pombe byr1基因的产物.
  • 调查MEK1.1的表达模式和功能活动.

主要方法:

  • 用补充DNA测序来确定MEK1.1的蛋白质结构.
  • 与已知的基因产物进行了序列和大小比较,包括S. pombe byr1基因产物.
  • 在细菌中表达了MEK1蛋白,并使用ERK基因产物评估了其激酶活性.

主要成果:

  • 阐明了MEK1的结构,揭示了393个氨基酸 (43,500达尔顿) 的蛋白质.
  • 在尺寸和序列上,MEK1与S. pombe byr1基因产物表现出最接近的相似性.
  • 在小鼠大脑中,MEK基因表达高.
  • 细菌表达的MEK1产品在ERK基因产品上表现出酸化活性.

结论:

  • MEK1是MAP激酶 (ERK) 信号的关键上游激活剂.
  • 结构和序列的同质性表明,跨物种的酶功能得到保护.
  • 大脑中MEK1的高表达表明它在神经元信号通路中的重要作用.