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Covalently Linked Protein Regulators

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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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Modification of secretory and transmembrane proteins entering the rough ER begins in the ER lumen. These modifications aid in protein folding and stabilize the acquired tertiary structure. Protein modifications in the rough ER co-occur at different stages of protein folding.
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At the transition from prophase to metaphase, there is a reduction in cohesion along the chromosomal arms, resulting in the resolution of sister chromatids. However, residual cohesin connections remain to hold the sister chromatids together until the transition from metaphase to anaphase. The residual connection prevents any premature separation of sister chromatids, blocking the risks of aneuploidy within the daughter cells.
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Phosphorylation01:02

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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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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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In eukaryotic cells, nascent mRNA transcripts need to undergo many post-transcriptional modifications to reach the cell cytoplasm and translate into functional proteins. For a long time, transcription and pre-mRNA processing were considered two independent events that occur sequentially in the cell. However, it has now been well established that transcription and pre-mRNA processing are two simultaneous processes that are precisely regulated inside the cell.
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Author Spotlight: Evaluation of Protein-Condensate Dynamics in Live Human Cells
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Crosstalk between protein post-translational modifications and phase separation.

Yang Liu1, Wenjuan Feng2, Yunshan Wang3,4

  • 1Jinan Central Hospital, Cheeloo College of Medicine, Shandong University, Jinan, China.

Cell Communication and Signaling : CCS
|February 12, 2024
PubMed
Summary

Cellular phase separation is regulated by protein post-translational modifications. Understanding these interactions is key to exploring diseases and cellular processes.

Keywords:
Biomolecular condensatesNeurodegenerative DiseasesPhase separationPost-translational modificationsTumorsViral Infections

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Area of Science:

  • Cell Biology
  • Biochemistry
  • Molecular Biology

Background:

  • Cellular phase separation is crucial for biological processes.
  • Existing research on protein modifications' role in phase separation has limitations.
  • This study investigates multiple protein post-translational modifications (PTMs).

Discussion:

  • PTMs like phosphorylation, methylation, acetylation, ubiquitination, and SUMOylation regulate phase separation.
  • These modifications influence the formation and stability of phase-separated structures via multivalent interactions.
  • The interplay between PTMs and phase separation is implicated in diseases and fundamental cellular functions.

Key Insights:

  • Protein phosphorylation, methylation, acetylation, ubiquitination, and SUMOylation are key regulators of biomolecular condensates.
  • Multivalent interactions mediated by PTMs control the dynamics of phase separation.
  • This regulatory network is vital for cellular homeostasis and responses to stimuli.

Outlook:

  • Exploring novel PTMs offers new avenues for understanding phase separation.
  • Targeting PTM-mediated phase separation could lead to therapeutic strategies for neurodegenerative diseases, cancer, and infections.
  • Further research can elucidate the precise mechanisms linking PTMs to phase separation in various biological contexts.