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Related Concept Videos

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Protein Kinases and Phosphatases

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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.
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Phosphoinositides are a group of phospholipids containing a glycerol backbone with two fatty acid chains and a phosphate attached to a myoinositol sugar ring. The inositol head group extends into the cytoplasm, where it is modified by adding phosphate groups to form phosphatidylinositol phosphates or PIPs.
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Binding sites linkages can regulate a protein's function.  For example, enzyme activity is often regulated through a feedback mechanism where the end product of the biochemical process serves as an inhibitor.
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The Proteasome Structure01:17

The Proteasome Structure

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The ubiquitin-proteasome pathway is a well-known mechanism utilized by eukaryotic cells to remove cytoplasmic proteins that are misfolded, damaged, or no longer needed. In this pathway, the protein that needs to be eliminated undergoes a process called ubiquitination, where a chain of ubiquitin molecules is attached to the 48th lysine residue of the target protein. This ubiquitin modification helps the proteasome distinguish between a target protein and a healthy protein.
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Phosphorylation01:02

Phosphorylation

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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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Enzymes like flippase, floppase, and scramblase transfer phospholipids from one layer to another in the membrane, thereby affecting membrane asymmetry.
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Updated: Jun 11, 2025

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Substrate recognition principles for the PP2A-B55 protein phosphatase.

Thomas Kruse1, Dimitriya H Garvanska1, Julia K Varga2

  • 1Novo Nordisk Foundation Center for Protein Research, Faculty of Health and Medical Sciences, Blegdamsvej 3B, 2200 Copenhagen, Denmark.

Science Advances
|October 2, 2024
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Summary
This summary is machine-generated.

Protein phosphatase 2A with B55 (PP2A-B55) binds substrates via conserved alpha helices. A novel inhibitor reveals PP2A-B55 regulation of the nuclear exosome targeting complex.

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Structural Biology

Background:

  • The serine/threonine phosphatase PP2A-B55 is crucial for eukaryotic signaling pathways.
  • Understanding PP2A-B55 substrate specificity is a significant knowledge gap.

Purpose of the Study:

  • To elucidate the mechanism of PP2A-B55 substrate recognition.
  • To develop tools for interrogating PP2A-B55 function.

Main Methods:

  • Integration of AlphaFold protein structure prediction with high-resolution mutational scanning.
  • Deep learning-based protein design for inhibitor development.
  • Biochemical assays to characterize protein-protein interactions.

Main Results:

  • Identified an evolutionarily conserved mechanism for alpha-helical substrate binding to B55.
  • Key amino acid determinants in substrates engage specific hydrophobic and electrostatic patches on B55.
  • Generated a potent peptide inhibitor of PP2A-B55 substrate interactions.
  • Demonstrated PP2A-B55 regulation of the nuclear exosome targeting (NEXT) complex via RBM7 interaction.

Conclusions:

  • Established a framework for understanding PP2A-B55 substrate selection.
  • Provided a novel inhibitor for studying PP2A-B55 in biological contexts.
  • Uncovered a role for PP2A-B55 in RNA processing through regulation of the NEXT complex.