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Positioning determines function: Wandering PKM2 performs different roles in tumor cells.

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Summary

Pyruvate kinase M2 (PKM2) is a versatile enzyme involved in cancer cell metabolism and non-metabolic functions. This review highlights recent discoveries on PKM2

Keywords:
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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Oncology

Background:

  • Pyruvate kinase M2 (PKM2) is a key glycolytic enzyme with dual roles as a metabolic and non-metabolic (kinase) enzyme.
  • PKM2 is extensively studied for its involvement in tumor cell proliferation, migration, invasion, and metabolism.
  • PKM2 exhibits dynamic localization, found intracellularly (nuclear, cytoplasmic, mitochondrial) and extracellularly (exosomal, circulating).

Purpose of the Study:

  • To review recent advancements in PKM2 research, focusing on its non-metabolic functions.
  • To discuss novel roles of PKM2, such as RNA-binding protein activity, Golgi apparatus protection, and microenvironment remodeling.
  • To briefly introduce recent findings on PKM1, the paralog of PKM2.

Main Methods:

  • Literature review of recent studies on PKM2 and PKM1.
  • Synthesis of information on PKM2's diverse cellular locations and functions.
  • Analysis of non-metabolic roles and emerging functions of PKM2.

Main Results:

  • PKM2 functions beyond glycolysis, acting as an RNA-binding protein (RBP) to support its metabolic activity.
  • Emerging roles of PKM2 include protection of the Golgi apparatus and remodeling of the tumor microenvironment.
  • PKM1, a related enzyme, is under-investigated, with recent discoveries beginning to emerge.

Conclusions:

  • PKM2 possesses significant non-metabolic functions crucial in cancer biology.
  • Further research into PKM2's novel roles and its paralog PKM1 is warranted.
  • Understanding PKM2's multifaceted roles can offer new therapeutic strategies in oncology.