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Emerging Roles of Post-Translational Modifications in Metabolic Homeostasis and Type 2 Diabetes.

Yong Kyung Kim1, Hyeongseok Kim2,3,4

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International Journal of Molecular Sciences
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Summary

Post-translational modifications (PTMs) integrate nutrient and hormonal signals for energy balance. Dysregulated PTMs in metabolic diseases like obesity and diabetes disrupt key cellular functions, leading to insulin resistance.

Keywords:
diabetes mellitusinsulin sensitivitymetabolic disorderpost-translational modification

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Area of Science:

  • Biochemistry
  • Metabolism
  • Cellular Biology

Background:

  • Post-translational modifications (PTMs) are crucial regulatory mechanisms linking nutrient and hormonal signals to energy homeostasis.
  • PTMs influence protein activity, localization, stability, and metabolic networks in a tissue- and state-specific manner.
  • These modifications integrate signaling pathways, chromatin function, and organelle activities.

Purpose of the Study:

  • To elucidate the role of PTMs in organizing metabolic information flow and tissue responses to metabolic stress.
  • To understand how PTM networks integrate nutrient sensing with cellular functions like transcription and mitochondrial activity.
  • To highlight the implications of PTM dysregulation in metabolic diseases such as obesity and diabetes.

Main Methods:

  • Network analysis of PTM crosstalk connecting kinase cascades, nutrient-sensing pathways, and ubiquitin modifiers.
  • Investigation of how metabolic state influences PTM enzyme activity via cofactors, redox tone, and compartmentalization.
  • Examination of PTM-dependent feedback mechanisms on transcription and signaling.

Main Results:

  • PTMs orchestrate key metabolic processes including gluconeogenesis, lipolysis, glucose uptake, thermogenesis, and insulin secretion.
  • Metabolic state dynamically regulates PTM enzymes, and PTMs, in turn, feedback to metabolic tone.
  • Dysregulated PTM networks in obesity and diabetes impair insulin signaling, organelle quality control, and beta cell function.

Conclusions:

  • PTMs are central organizers of metabolic information flow, crucial for whole-body energy homeostasis.
  • Understanding PTM networks provides insights into metabolic disease mechanisms.
  • PTMs represent potential therapeutic targets for metabolic disorders like obesity and diabetes.