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Related Experiment Videos

PDZ domain binding selectivity is optimized across the mouse proteome.

Michael A Stiffler1, Jiunn R Chen, Viara P Grantcharova

  • 1Department of Chemistry and Chemical Biology, Harvard University, 12 Oxford Street, Cambridge, MA 02138, USA.

Science (New York, N.Y.)
|July 21, 2007
PubMed
Summary
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PDZ domains, crucial for protein interactions, do not form distinct functional classes. Instead, they exhibit a broad distribution in binding selectivity, suggesting proteome-wide optimization to reduce cross-reactivity.

Area of Science:

  • Molecular Biology
  • Proteomics
  • Bioinformatics

Background:

  • PDZ domains are key protein interaction modules.
  • Previous understanding suggested discrete functional classes based on peptide-binding preferences.

Purpose of the Study:

  • To characterize the binding selectivity of mouse PDZ domains against a large set of peptides.
  • To develop a predictive model for PDZ domain-peptide interactions.
  • To challenge the existing paradigm of discrete PDZ domain functional classes.

Main Methods:

  • Utilized protein microarrays for high-throughput screening.
  • Employed quantitative fluorescence polarization to measure binding affinities.
  • Developed and trained a multidomain selectivity model.

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Main Results:

  • Characterized binding selectivity for 157 mouse PDZ domains against 217 peptides.
  • The developed model accurately predicts PDZ domain-peptide interactions across the mouse proteome.
  • Demonstrated that PDZ domains are distributed across selectivity space, not clustered into discrete classes.

Conclusions:

  • The current paradigm of discrete PDZ domain classes is challenged.
  • PDZ domains appear optimized across the proteome to minimize cross-reactivity.
  • Integrating experimentation with modeling of interaction domain families is crucial for future protein function studies.