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Engineered Domain Swapping as an On/Off Switch for Protein Function.

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Engineered protein domain swapping, using a ubiquitin lever, creates functional switches. This method controls protein refolding and self-assembly for novel biomaterials.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Protein Engineering

Background:

  • Domain swapping is a protein dimerization mechanism where identical proteins exchange segments.
  • Engineered protein swapping offers potential for creating self-assembling biomaterials with emergent functions.
  • Natural mechanisms of protein domain swapping are not well understood.

Purpose of the Study:

  • To demonstrate induced domain swapping for regulating target protein function.
  • To engineer a system where a "lever" protein (ubiquitin) triggers protein refolding and swapping.
  • To investigate the formation and structure of homo-swapped and hetero-swapped protein complexes.

Main Methods:

  • Fusion of ubiquitin (lever protein) into specific loops of the ribose binding protein (RBP).
  • Induction of in trans refolding to generate swapped oligomers.
  • Nuclear magnetic resonance (NMR) spectroscopy to determine the structure of swapped complexes.

Main Results:

  • RBP-ubiquitin fusions undergo homo-swapping, with ubiquitin acting as the hinge.
  • Non-identical RBP-ubiquitin fusions exhibit more efficient hetero-swapping than self-swapping.
  • NMR reveals the hinge in hetero-swapped complexes is located in the RBP region, distant from ubiquitins.

Conclusions:

  • Induced domain swapping using a lever protein is a viable strategy to control protein function.
  • This protein engineering approach enables the creation of functional switches.
  • The design is adaptable for other proteins, expanding possibilities for biomaterial development.