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Related Concept Videos

Protein-protein Interfaces02:04

Protein-protein Interfaces

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Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a...
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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.
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An organism can have thousands of different proteins, and these proteins must cooperate to ensure the health of an organism. Proteins bind to other proteins and form complexes to carry out their functions. Many proteins interact with multiple other proteins creating a complex network of protein interactions.
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Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
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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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Updated: Jun 1, 2025

A Mass Spectrometry-Based Approach to Identify Phosphoprotein Phosphatases and their Interactors
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A framework for understanding and investigating polyphosphate-protein interactions.

Liam McCarthy1,2, Kanchi Baijal1,2, Michael Downey1,2

  • 1Department of Cellular and Molecular Medicine, University of Ottawa, Ottawa, Ontario, Canada.

Biochemical Society Transactions
|January 21, 2025
PubMed
Summary

Polyphosphate (polyP), an inorganic polymer in cells, is gaining attention for its roles in human health. New research reveals novel polyP-protein interactions that regulate cellular functions and signaling pathways.

Keywords:
PPKPPXVTC4polyPpolyphosphatepolyphosphorylation

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Area of Science:

  • Cellular Biology
  • Biochemistry
  • Molecular Biology

Background:

  • Prokaryotic and eukaryotic cells store inorganic phosphate as polyphosphate (polyP) polymers.
  • PolyP is increasingly recognized for its diverse roles in human health.
  • PolyP-protein interactions are crucial for cellular homeostasis and signaling.

Purpose of the Study:

  • To review recent findings on polyphosphate-protein interactions.
  • To delineate the functional implications of these interactions at the molecular level.
  • To identify key questions for future research in the field.

Main Methods:

  • Literature review of recent studies on polyP-protein interactions.
  • Analysis of newly identified polyP-binding motifs.
  • Synthesis of current understanding of polyP-protein functional roles.

Main Results:

  • Recent studies challenge existing models of polyP-protein binding.
  • New motifs for polyP binding to proteins have been identified.
  • These interactions are implicated in regulating cellular homeostasis and signaling pathways.

Conclusions:

  • Polyphosphate-protein interactions are fundamental to cellular regulation.
  • Further research is needed to fully understand these molecular mechanisms.
  • Addressing open questions will advance the study of polyP in health and disease.