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In Vitro Analysis of PDZ-dependent CFTR Macromolecular Signaling Complexes
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Stereochemical preferences modulate affinity and selectivity among five PDZ domains that bind CFTR: comparative

Jeanine F Amacher1, Patrick R Cushing1, Lionel Brooks2

  • 1Department of Biochemistry, Geisel School of Medicine at Dartmouth, Hanover, NH 03755, USA.

Structure (London, England : 1993)
|November 12, 2013
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Summary

PDZ domain interactions are key to cellular processes. New research reveals non-motif residues significantly influence CAL PDZ domain binding, improving identification of high-affinity interactions and CFTR trafficking specificity.

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Area of Science:

  • Molecular Biology
  • Structural Biology
  • Cellular Biology

Background:

  • PDZ domains mediate crucial cellular signaling and trafficking pathways.
  • Existing motif analysis for PDZ domain binding is limited, particularly for the CAL PDZ domain, leading to overprediction of interactors.

Purpose of the Study:

  • To investigate the role of non-motif residues in CAL PDZ domain binding.
  • To identify high-affinity CAL binding sequences and understand their contribution to CFTR trafficking specificity.

Main Methods:

  • Utilized extended peptide-array motif analysis combined with biochemical techniques.
  • Determined crystallographic structures of 13 CAL:peptide complexes.
  • Employed multisequence substitutional arrays to uncover modulator preferences.

Main Results:

  • Non-motif residues act as "modulators" influencing CAL PDZ domain binding affinity.
  • Crystallographic data revealed accommodating stereochemical environments at non-motif positions.
  • Identified specific modulator preferences that enhance the prediction of high-affinity CAL binders.
  • Demonstrated differential effects of these preferences on CAL versus NHERF PDZ binding.

Conclusions:

  • Non-motif residues are critical for high-affinity PDZ domain interactions, refining binding specificity.
  • Understanding these modulator residues enhances the prediction of functional PDZ domain interactions.
  • This work provides insights into the PDZ domain network regulating CFTR trafficking at the apical membrane.