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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...
Assembly of Signaling Complexes01:30

Assembly of Signaling Complexes

Multiprotein signaling complexes are formed in a dynamic process involving protein-protein interactions at the cytoplasmic domain of transmembrane receptors or enzymatic and non-enzymatic proteins associated with the receptor. These complexes ensure the activation and propagation of intracellular signals that regulate cell functions.
Interaction domains in cell signaling
Interaction domains recognize exposed features of their binding partners containing post-translationally modified sequences,...
Microtubule Associated Proteins (MAPs)01:42

Microtubule Associated Proteins (MAPs)

Microtubule function and architecture are regulated by an array of specialized proteins called microtubule-associated proteins or MAPs. These proteins are widespread across different organisms and have conserved protein motifs, like the multi-TOG domain for tubulin binding found in the CLASP family of MAPs. Some MAPs are lineage-specific based on their conserved domains. Their functions depend upon the cytoskeletal architecture and cell type they are located within. In-plant cells, a specific...
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...
cAMP-dependent Protein Kinase Pathways01:25

cAMP-dependent Protein Kinase Pathways

Cyclic Adenosine Monophosphate (cAMP) is an essential second messenger that activates protein kinase A (PKA) and regulates various biological processes. A single epinephrine molecule binds to GPCR and activates several heterotrimeric G proteins, each stimulating multiple adenylyl cyclase, amplifying the signal, and synthesizing large numbers of cAMP molecules. Small changes in cAMP concentration affect PKA activity. The binding of four cAMP molecules induces a conformational change in PKA,...
Interactions Between Signaling Pathways01:19

Interactions Between Signaling Pathways

Signaling cascades usually lack linearity. Multiple pathways interact and regulate one another, allowing cells to integrate and respond to diverse environmental stimuli.
Convergence and divergence, and cross-talk between signaling pathways
Two distinct signaling pathways can converge on a single functional unit, which may either be a single protein or a complex of proteins. The response is either functionally distinct or synergistic between the two pathways but different from the response...

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Updated: Jun 24, 2026

Imaging Spatial Reorganization of a MAPK Signaling Pathway Using the Tobacco Transient Expression System
08:54

Imaging Spatial Reorganization of a MAPK Signaling Pathway Using the Tobacco Transient Expression System

Published on: March 20, 2016

MAPKのエスカファードは助けの手を差し伸べます.

Markus A Seeliger1, John Kuriyan

  • 1Department of Molecular and Cell Biology, University of California, Howard Hughes Medical Institute, Berkeley, Berkeley, CA 94720, USA.

Cell
|March 24, 2009
PubMed
まとめ
この要約は機械生成です。

Ste5のような基板タンパク質は受動的ではありません. 芽生えた酵母では,Ste5はFus3キナーゼを主動的にアロステリックに活性化させ,この重要なミトゲン活性化タンパク質キナーゼ経路で信号伝達を可能にします.

さらに関連する動画

Methods to Study Mrp4-containing Macromolecular Complexes in the Regulation of Fibroblast Migration
10:43

Methods to Study Mrp4-containing Macromolecular Complexes in the Regulation of Fibroblast Migration

Published on: May 19, 2016

Microfluidic Synthesis of Microgel Building Blocks for Microporous Annealed Particle Scaffold
09:34

Microfluidic Synthesis of Microgel Building Blocks for Microporous Annealed Particle Scaffold

Published on: June 16, 2022

関連する実験動画

Last Updated: Jun 24, 2026

Imaging Spatial Reorganization of a MAPK Signaling Pathway Using the Tobacco Transient Expression System
08:54

Imaging Spatial Reorganization of a MAPK Signaling Pathway Using the Tobacco Transient Expression System

Published on: March 20, 2016

Methods to Study Mrp4-containing Macromolecular Complexes in the Regulation of Fibroblast Migration
10:43

Methods to Study Mrp4-containing Macromolecular Complexes in the Regulation of Fibroblast Migration

Published on: May 19, 2016

Microfluidic Synthesis of Microgel Building Blocks for Microporous Annealed Particle Scaffold
09:34

Microfluidic Synthesis of Microgel Building Blocks for Microporous Annealed Particle Scaffold

Published on: June 16, 2022

科学分野:

  • 細胞の信号伝達経路は,
  • 分子生物学は分子生物学である.
  • イースト遺伝学 イースト遺伝学

背景:

  • 伝統的にシグナリングカスケードの被動的なオーガナイザーとして見なされているエスカフォードタンパク質.
  • ミトゲン活性化タンパク質キナーゼ (MAPK) 経路は,細胞のコミュニケーションに不可欠です.
  • 基板タンパク質がキナーゼ活性を調節する役割は,依然として調査の対象となっている.

研究 の 目的:

  • 発芽酵母における脚架タンパク質Ste5の機能的役割を調査する.
  • Ste5は,シンプルな脚手架を超えて,活発な規制機能を持っているかどうかを判断する.
  • Ste5がFus3キナーゼの活性に影響するメカニズムを解明する.

主な方法:

  • サッカロマイセス・セレヴィセア (芽生えた酵母菌) の遺伝子解析.
  • バイオケミカルアッセイでキナーゼ活性と基質認識を評価する.
  • Ste5とFus3.3の相互作用に焦点を当てた研究

主要な成果:

  • 脚本タンパク質Ste5がFus3キナーゼのアロステリック活性化剤であることを実証した.
  • Ste5結合により,Fus3がキナーゼ基質としての能力を持つことが示された.
  • Ste5機能の受動的なテッティングモデルに対する証拠を提供した.

結論:

  • 脚本タンパク質は,シグナル伝達経路において,活発で規制的な役割を果たすことができる.
  • Ste5はFus3キナーゼの活性を積極的に調節し,信号伝送を容易にする.
  • この発見は,細胞シグナル伝達におけるスキャフォールドタンパク質の機能パラダイムを再定義する.