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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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The gene expression in cells is regulated at different stages: (i) transcription, (ii) RNA processing, (iii) RNA localization, and (iv) translation. Transcriptional regulation is mediated by regulatory proteins such as transcription factors, activators, or repressors—these control gene expression by initiating or inhibiting the transcription of genes. Once a precursor or pre-mRNA is produced, it undergoes post-transcriptional modification, including 5' capping, splicing, and the...
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Gene expression can be regulated at almost every step from gene to protein. Transcription is the step that is most commonly regulated. This involves the binding of proteins to short regulatory sequences on the DNA. This association can either promote or inhibit the transcription of a gene associated with the respective sequence.
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Utilizing a Comprehensive Immunoprecipitation Enrichment System to Identify an Endogenous Post-translational Modification Profile for Target Proteins
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Targeting PTEN Regulation by Post Translational Modifications.

Ana González-García1, Antonio Garrido1, Ana C Carrera1

  • 1Department of Immunology and Oncology, Centro Nacional de Biotecnología, Consejo Superior de Investigaciones Científicas (CSIC), Universidad Autónoma de Madrid, Cantoblanco, E-28049 Madrid, Spain.

Cancers
|November 26, 2022
PubMed
Summary
This summary is machine-generated.

Phosphatidylinositol-3,4,5-triphosphate (PIP3) is crucial for cell signaling. Its regulation by PTEN phosphatase is vital, as PTEN inactivation drives cancer by increasing PIP3 levels.

Keywords:
PTENphosphorylationpost-translational modificationsumoylationubiquitination

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Oncology

Background:

  • Phosphatidylinositol-3,4,5-triphosphate (PIP3) is a key lipid second messenger regulating cell proliferation, migration, and survival.
  • PI3-kinase activation transiently increases PIP3 levels after growth factor stimulation.
  • Tight regulation of PIP3 is essential for normal cellular function.

Purpose of the Study:

  • To investigate the role of PTEN phosphatase in regulating PIP3 levels.
  • To explore the mechanisms of PTEN regulation, including post-translational modifications.
  • To identify potential therapeutic strategies targeting the PI3-kinase/PTEN axis in cancer.

Main Methods:

  • Review of literature on PIP3 signaling and PTEN regulation.
  • Analysis of PTEN's role as a tumor suppressor.
  • Discussion of PTEN post-translational modifications (acetylation, oxidation, phosphorylation, sumoylation, ubiquitination).

Main Results:

  • PTEN is the primary phosphatase dephosphorylating PIP3 to PIP2.
  • PTEN inactivation contributes to cancer development by elevating PIP3 levels.
  • PTEN activity is modulated by various post-translational modifications, affecting its stability, localization, and function.

Conclusions:

  • PTEN's complex regulation through post-translational modifications offers potential therapeutic targets.
  • Restoring PTEN function could be a viable strategy for treating PIP3-dependent tumors.
  • Understanding PTEN regulation is critical for developing novel cancer therapies.