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Related Experiment Videos

Interaction between HERC1 and M2-type pyruvate kinase.

Francesc R Garcia-Gonzalo1, Cristina Cruz, Purificación Muñoz

  • 1Departament de Ciències Fisiològiques II, Campus de Bellvitge, Universitat de Barcelona, C/Feixa Llarga s/n, L'Hospitalet de Llobregat, E-08907 Barcelona, Spain.

FEBS Letters
|March 26, 2003
PubMed
Summary

HERC1 protein interacts with glycolytic enzyme pyruvate kinase M2 isoform (M2-PK). This interaction does not affect M2-PK

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Area of Science:

  • Molecular biology
  • Cellular biology
  • Biochemistry

Background:

  • HERC proteins possess RCC1-like and HECT domains, suggesting roles as guanine nucleotide exchange factors and E3 ubiquitin ligases.
  • HERC1 is a large protein implicated in intracellular membrane trafficking.
  • Pyruvate kinase M2 isoform (M2-PK) is a key glycolytic enzyme.

Purpose of the Study:

  • To investigate a potential physical interaction between HERC1 and M2-PK.
  • To determine the functional consequences of this interaction on M2-PK.

Main Methods:

  • Immunofluorescence studies to observe partial colocalization of endogenous HERC1 and M2-PK.
  • Biochemical assays to assess M2-PK ubiquitination and enzymatic activity.

Main Results:

Related Experiment Videos

  • A physical interaction was identified between the HECT domain of HERC1 and M2-PK.
  • Endogenous HERC1 and M2-PK showed partial colocalization within cells.
  • The observed interaction did not lead to M2-PK ubiquitination.
  • Enzymatic activity of M2-PK remained unaffected by the interaction with HERC1.

Conclusions:

  • HERC1 and M2-PK associate physically.
  • This interaction does not alter M2-PK's ubiquitination status or enzymatic function.
  • The biological significance of the HERC1-M2-PK association warrants further investigation.