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The Rosetta Stone Hypothesis-Based Interaction of the Tumor Suppressor Proteins Nit1 and Fhit

Sonnhild Mittag1, Franziska Wetzel1, Sebastian Y Müller2

  • 1Institute of Biochemistry II, Jena University Hospital, Friedrich Schiller University Jena, Nonnenplan 2-4, 07743 Jena, Germany.

Cells
|February 11, 2023
PubMed

Insights

The tumor suppressor proteins Nitrilase1 (Nit1) and fragile histidine triad (Fhit) directly interact, supporting the Rosetta Stone hypothesis. This interaction may influence their functions and signaling pathways.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Signaling

Background:

  • The tumor suppressor proteins Nitrilase1 (Nit1) and fragile histidine triad (Fhit) are known repressors of the canonical Wnt pathway and interact with β-catenin.
  • In some organisms, Nit1 and Fhit are expressed as a single NitFhit fusion protein, suggesting a potential interaction.

Purpose of the Study:

  • To test the Rosetta Stone hypothesis by investigating the physical interaction between Nit1 and Fhit.
  • To provide biochemical evidence for the direct association of Nit1 and Fhit.

Main Methods:

  • Biochemical assays to demonstrate direct association between Nit1 and Fhit.
  • Size exclusion chromatography of purified recombinant human Nit1.
  • Identification of common interaction partners for Nit1 and Fhit.

Main Results:

  • Direct biochemical evidence for the association between Nit1 and Fhit was established.
  • Purified recombinant human Nit1 exhibited a tetrameric structure, consistent with the NitFhit fusion protein Nft-1 in C. elegans.
  • Hsp60 and Ubc9 were identified as common interaction partners for both Nit1 and Fhit.

Conclusions:

  • The findings support the Rosetta Stone hypothesis, indicating a functional and physical interaction between Nit1 and Fhit.
  • The interaction between Nit1 and Fhit may modulate their individual enzymatic activities and their interactions with other cellular components.
Keywords:
FhitHsp60Nit1NitFhitRosetta Stone hypothesisUbc9tumor suppressor

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