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The JAK-STAT Signaling Pathway

Several cytokine receptors have tightly bound Janus kinase or JAK proteins attached at their cytosolic tail. Small signaling molecules such as cytokines, growth hormones, or prolactins bind to the cytokine receptors and initiate their dimerization. The dimerization brings the cytosolic JAKs together that trans-phosphorylate and activates each other. The activated JAKs now phosphorylate cytosolic tails of the cytokine receptors, which serve as binding sites for adaptor proteins such as  SH2...
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The TGF-β signaling pathway regulates cell growth, differentiation, adhesion, motility, and development. TGF-β ligands that induce TGF-β signaling are synthesized in their latent form. Several proteases or cell surface receptors such as integrins act upon the latent form, releasing the active ligand. There are three types of mammalian TGF-βs: (TGF-β1, TGF-β2, and TGF-β3) that bind as homodimers or heterodimers to TGF-β receptors. The TGF-β receptors are of three kinds RI, RII, and RIII. The RI...
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The addition or removal of phosphate groups from proteins is the most common chemical modification that regulates cellular processes. These modifications can affect the structure, activity, stability, and localization of proteins within cells as well as their interactions with other proteins.
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Protein Kinases and Phosphatases02:54

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Proteins undergo chemical modifications that trigger changes in the charge, structure, and conformation of the proteins. Phosphorylation, acetylation, glycosylation, nitrosylation, ubiquitination, lipidation, methylation, and proteolysis are various protein modifications that regulate protein activity. Such modifications are usually enzyme-driven.
Protein kinases
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Protein Kinases and Phosphatases02:54

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A Mass Spectrometry-Based Approach to Identify Phosphoprotein Phosphatases and their Interactors
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Phosphatases in SMAD regulation.

David L Bruce1, Gopal P Sapkota

  • 1MRC Protein Phosphorylation Unit, College of Life Sciences, University of Dundee, Dow Street, DD1 5EH Dundee, Scotland, UK.

FEBS Letters
|May 12, 2012
PubMed
Summary

SMAD proteins, crucial for transforming growth factor-beta (TGFß) signaling, are regulated by phosphorylation. This review examines protein phosphatases that target SMADs, clarifying their roles in TGFß/BMP pathways.

Area of Science:

  • Molecular Biology
  • Cell Signaling
  • Biochemistry

Background:

  • SMAD transcription factors mediate signaling for the transforming growth factor-beta (TGFß) superfamily.
  • Phosphorylation is a key regulatory mechanism for SMAD protein function.
  • Dysregulated TGFß signaling is implicated in various diseases, including cancer and fibrosis.

Purpose of the Study:

  • To provide an overview of SMAD regulation by protein phosphatases.
  • To review the evidence linking specific phosphatases to SMAD dephosphorylation.
  • To identify candidate SMAD-phosphatases involved in TGFß/BMP signaling.

Main Methods:

  • Literature review and analysis of existing research.
  • Examination of biochemical and genetic studies on SMAD-phosphatase interactions.

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  • Synthesis of data on the functional consequences of SMAD dephosphorylation.

    • Main Results:

    • Several protein phosphatases, including PP1, PP2A, and Wip1, have been implicated in SMAD dephosphorylation.
    • Evidence suggests distinct phosphatases may target specific SMAD proteins or phosphorylation sites.
    • The activity of these phosphatases influences the duration and amplitude of TGFß/BMP signals.

    Conclusions:

    • Protein phosphatases are critical regulators of SMAD activity and TGFß/BMP signaling.
    • Understanding SMAD-phosphatase interactions is essential for deciphering TGFß pathway dynamics.
    • Targeting SMAD-phosphatase interactions may offer therapeutic strategies for diseases involving TGFß pathway dysregulation.