Curvature of designed armadillo repeat proteins allows modular peptide binding
Simon Hansen1, Patrick Ernst1, Sebastian L B König1
1Department of Biochemistry, University of Zurich, Winterthurerstrasse 190, 8057 Zürich, Switzerland.
Consensus designed armadillo repeat proteins (dArmRPs) show optimal geometry for modular peptide binding. Crystal structures reveal insights into dArmRP curvature, confirming their potential as peptide-binding scaffolds.
Area of Science:
- Protein Engineering
- Structural Biology
- Biophysics
Background:
- Designed armadillo repeat proteins (dArmRPs) offer a modular approach to peptide binding.
- A key requirement for dArmRPs is a geometry that accommodates peptide bond lengths.
Purpose of the Study:
- To determine the geometric parameters of dArmRPs.
- To assess the suitability of dArmRPs for modular peptide recognition.
Main Methods:
- Determination of 27 dArmRP X-ray structures.
- Calculation of dArmRP curvature parameters.
- Single-molecule Förster Resonance Energy Transfer (smFRET) experiments.
Main Results:
- Consensus dArmRPs exhibit curvatures near the optimal range for peptide binding.
- Peptide binding can induce optimal curvature in dArmRPs, confirmed by smFRET.
- Computationally designed ArmRPs showed greater structural divergence than expected.
Conclusions:
- Consensus dArmRPs are well-suited scaffolds for developing modular peptide binders.
- Crystal lattice formation can influence dArmRP curvature, impacting structural evaluation.
- Understanding dArmRP geometry is crucial for designing effective peptide-binding technologies.
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