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Published on: December 6, 2017
Designed Armadillo repeat proteins: library generation, characterization and selection of peptide binders with high
Gautham Varadamsetty1, Dirk Tremmel, Simon Hansen
1Department of Biochemistry, University of Zürich, Zürich, Switzerland.
Journal of Molecular Biology
|September 19, 2012
Summary
Designed Armadillo repeat proteins (ArmRPs) offer a novel modular peptide-binding solution. Libraries of these stable, well-expressed proteins were successfully selected for high-affinity neurotensin binders.
Area of Science:
- Protein Engineering
- Biochemistry
- Molecular Biology
Background:
- Designed Armadillo repeat proteins (ArmRPs) are a new class of modular binding proteins.
- They exhibit excellent expression and stability properties, making them promising for various applications.
Purpose of the Study:
- To generate and characterize combinatorial libraries of designed ArmRPs for peptide binding.
- To investigate the potential of these libraries as a source for novel peptide-binding molecules.
Main Methods:
- Sequence and structural consensus analyses were used to design a 42-amino-acid ArmRP module with randomized positions.
- Combinatorial libraries of ArmRPs were assembled, focusing on the stable N5C format.
- Ribosome display selections were performed against the peptide neurotensin.
Main Results:
- Unselected N5C library members showed good expression, monomeric nature, and cooperative unfolding.
- Four rounds of ribosome display successfully enriched highly specific peptide binders.
- Analysis revealed four key peptide side chains contributing to interaction energy.
Conclusions:
- Designed ArmRP libraries are a valuable source for discovering peptide-binding molecules.
- Their favorable biophysical properties support applications in general modular peptide recognition.
- This work demonstrates the potential of ArmRPs in targeted molecular binding.
