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Alpha repeat proteins (αRep) as expression and crystallization helpers.

Anne Chevrel1, Agnes Mesneau1, Dyana Sanchez1

  • 1Institute for Integrative Biology of the Cell (I2BC) CEA, CNRS, Univ. Paris-Sud, Université Paris-Saclay, 91198 Gif-sur-Yvette cedex, France.

Journal of Structural Biology
|August 22, 2017
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Summary
This summary is machine-generated.

Artificial repeat proteins (αReps) can now be selected using protein complementation assay (PCA), simplifying the process. These binders enhance the expression, stability, and crystallization of challenging proteins.

Keywords:
Artificial repeat proteinsCrystallization helperFusion proteinProtein complementation assayProtein library

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Area of Science:

  • Protein engineering
  • Structural biology
  • Biotechnology

Background:

  • A diverse library of artificial repeat proteins (αReps) based on thermostable HEAT-like repeats was previously developed.
  • αReps have been selected to bind proteins that are difficult to crystallize, aiding in their crystallization.

Purpose of the Study:

  • To simplify production and crystallization experiments by exploring chimeric proteins (covalent association of target and binder).
  • To adapt the αRep library for selection via protein complementation assay (PCA), avoiding preliminary target protein purification.

Main Methods:

  • Development of chimeric proteins for enhanced expression, stability, and crystallogenesis.
  • Transfer of the αRep library to a new construction for selection by protein complementation assay (PCA).
  • Selection of specific αRep binders through direct interaction with the target protein in bacterial cytoplasm via PCA.

Main Results:

  • Chimeric proteins, when fused with cognate αRep binders, can be expressed, purified, and crystallized.
  • PCA allows selection of specific αRep binders without requiring preliminary purification of the target protein.
  • Selected αRep binders improve expression, stability, solubility, and crystallogenesis of difficult proteins.

Conclusions:

  • The PCA method offers a simplified approach for selecting αRep binders against challenging protein targets.
  • αRep technology, enhanced by PCA selection, provides a versatile tool for improving the production and crystallization of difficult proteins.
  • This advancement facilitates structural studies of proteins previously hindered by expression and crystallization challenges.