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Resurfaced shape complementary proteins that selectively bind the oncoprotein gankyrin.

Alex M Chapman1, Brian R McNaughton

  • 1Department of Chemistry and ‡Department of Biochemistry & Molecular Biology, Colorado State University , Fort Collins, Colorado 80523, United States.

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|August 20, 2014
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Researchers developed novel synthetic proteins to target gankyrin, an oncoprotein linked to cancer. This breakthrough offers a new strategy for developing cancer therapies and research tools by inhibiting disease-driving protein interactions.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Oncology

Background:

  • Aberrant protein-protein interactions involving the ankyrin repeat oncoprotein gankyrin are implicated in numerous cancers.
  • Targeting these interactions is a promising therapeutic strategy, but gankyrin's binding face poses challenges for traditional small molecule drug discovery due to its large, featureless surface.

Discussion:

  • This study employed a split-superpositive Green Fluorescent Protein (split-spGFP) reassembly system to screen a large library of engineered proteins.
  • The screening identified novel protein mutants designed to be shape-complementary to gankyrin's binding site, overcoming the limitations of small molecule approaches.

Key Insights:

  • The identified synthetic proteins demonstrate potent and selective binding to gankyrin both in vitro and within living cells.
  • This represents the first instance of engineered proteins successfully binding to gankyrin, validating the protein engineering approach.

Outlook:

  • These findings establish a generalizable strategy for developing protein-based research tools and potential drug leads against disease-relevant ankyrin repeat proteins.
  • This approach could pave the way for new therapeutic interventions targeting cancers driven by gankyrin and similar oncoproteins.