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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.
During phosphorylation, protein kinases transfer the terminal phosphate group of ATP to specific amino acid side chains of substrate proteins. Serine, threonine, and tyrosine are the most commonly...
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The histone proteins have a flexible N-terminal tail extending out from the nucleosome. These histone tails are often subjected to post-translational modifications such as acetylation, methylation, phosphorylation, and ubiquitination. Particular combinations of these modifications form “histone codes” that influence the chromatin folding and tissue-specific gene expression.
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The histone proteins in the nucleosomes are post-translationally modified (PTM) to increase or decrease access to DNA. The commonly observed PTMs are methylation, acetylation, phosphorylation, and ubiquitination of lysine amino acids in the histone H3 tail region. These histone modifications have specific meaning for the cell. Hence, they are called "histone code". The protein complex involved in histone modification is termed as "reader-writer" complex.
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RNA Polymerase (RNAP) is conserved in all animals, with bacterial, archaeal, and eukaryotic RNAPs sharing significant sequence, structural, and functional similarities. Among the three eukaryotic RNAPs, RNA Polymerase II is most similar to bacterial RNAP in terms of both structural organization and folding topologies of the enzyme subunits. However, these similarities are not reflected in their mechanism of action.
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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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Synthesis of Near-Infrared Emitting Gold Nanoclusters for Biological Applications
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Simulating mono- and multiprotein phosphorylation within nanoclusters.

Olivier Destaing1, Bertrand Fourcade2

  • 1Institute for Advanced Biosciences, Université Grenoble Alpes, Inserm U1209, CNRS UMR 5309, 38000 Grenoble, France.

Physical Review. E
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Summary
This summary is machine-generated.

Protein nanoclusters form via posttranslational modifications like phosphorylation. This study simulates how phosphorylation patterns, influenced by biophysical factors, create switch-like cellular responses, impacting protein function.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Biophysics

Background:

  • Protein nanoclustering is key to cellular activation and structure formation.
  • Posttranslational modifications, including phosphorylation and dephosphorylation, regulate nanocluster formation.
  • Existing models often view phosphorylation as binary, overlooking complex patterns.

Purpose of the Study:

  • To theoretically simulate protein phosphorylation dynamics within nanoclusters.
  • To explore the interplay between mono- and multiphosphorylation.
  • To understand how phosphatases convert graded phosphorylation signals into switch-like responses.

Main Methods:

  • Theoretical simulation of protein phosphorylation on multiple residues.
  • Analysis of biophysical parameters like diffusion and dwell time.
  • Modeling the role of phosphatases in signal transduction.

Main Results:

  • Protein phosphorylation can be either mono- or multiphosphorylated depending on biophysical parameters.
  • Multiphosphorylation exhibits cooperative effects within networks.
  • Phosphatases play a critical role in generating switch-like cellular responses from graded phosphorylation signals.

Conclusions:

  • Phosphorylation is a dynamic process with graded states, not just binary.
  • Understanding these phosphorylation dynamics is crucial for comprehending cellular activation and function.
  • The interplay of phosphorylation and dephosphorylation governs cellular signaling.