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Identifying and Validating Tankyrase Binders and Substrates: A Candidate Approach.

Katie Pollock1,2,3, Michael Ranes1,2, Ian Collins3

  • 1Division of Structural Biology, The Institute of Cancer Research, London, SW7 3RP, UK.

Methods in Molecular Biology (Clifton, N.J.)
|July 12, 2017
PubMed
Summary

Researchers developed methods to predict and study how tankyrase (an enzyme) binds to other proteins. This work aids in understanding protein interactions and poly(ADP-ribosyl)ation processes.

Keywords:
Enzyme–substrate relationshipsFluorescence polarization (FP)PARPPoly(ADP-ribosyl)ationProtein expressionProtein purificationProtein-protein interactionsStructural biologyTankyraseTankyrase-binding peptide motif

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Enzymology

Background:

  • Tankyrases (TNKS/ARTD5, TNKS2/ARTD6) are poly(ADP-ribose)polymerase enzymes crucial for cellular processes.
  • Their ankyrin repeat clusters (ARCs) recognize specific peptide motifs, mediating protein recruitment and scaffolding.
  • Understanding these interactions is key to elucidating tankyrase function in signaling and disease.

Purpose of the Study:

  • To provide a framework for predicting tankyrase-binding motifs (TBMs).
  • To establish experimental protocols for studying tankyrase-peptide interactions.
  • To facilitate the investigation of tankyrase-mediated poly(ADP-ribosyl)ation.

Main Methods:

  • Development of guidelines for predicting TBMs based on sequence rules and structural data.
  • Expression and purification of tankyrase ARCs from Escherichia coli.
  • Establishment of a fluorescence polarization assay for quantitative binding analysis.
  • Protocol for assessing protein binding and poly(ADP-ribosyl)ation in mammalian cells.

Main Results:

  • A predictive approach for identifying potential tankyrase-binding sequences has been outlined.
  • A robust method for expressing and purifying tankyrase ARCs is presented.
  • A fluorescence polarization assay effectively quantifies direct interactions between ARCs and TBM peptides.
  • A basic protocol is provided for in-cell evaluation of tankyrase-protein interactions and activity.

Conclusions:

  • This study offers valuable tools and guidance for researchers studying tankyrase biology.
  • The presented methods enable precise characterization of tankyrase-peptide interactions.
  • These findings will advance the understanding of tankyrase-mediated scaffolding and poly(ADP-ribosyl)ation in various biological contexts.