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Using flexible loop mimetics to extend phi-value analysis to secondary structure interactions.

N Ferguson1, J R Pires, F Toepert

  • 1Medical Research Council, Centre for Protein Engineering, Hills Road, Cambridge CB2 2QH, United Kingdom.

Proceedings of the National Academy of Sciences of the United States of America
|November 1, 2001
PubMed
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Chemical synthesis enabled incorporating nonnatural amino acids to study protein folding. A thioether linker in YAP 65 WW domain revealed insights into its folding pathway and stability.

Area of Science:

  • Biochemistry
  • Structural Biology
  • Chemical Biology

Background:

  • Chemical synthesis allows nonnatural amino acid incorporation for protein studies.
  • Proteins' folding pathways and thermodynamic stability can be probed using modified amino acids.

Purpose of the Study:

  • To investigate the folding pathway and thermodynamic stability of the human yes kinase-associated protein (YAP 65) WW domain.
  • To utilize a flexible thioether linker as a loop mimetic to probe protein folding without altering the denatured state.

Main Methods:

  • Incorporation of a flexible thioether linker into the YAP 65 WW domain.
  • Nuclear Magnetic Resonance (NMR) spectroscopy for solution structure determination.
  • Phi-value analysis to study the folding transition state.

Related Experiment Videos

Main Results:

  • The thioether linker minimally affected the global fold of the WW domain but increased loop dynamics.
  • Thioether variants showed destabilization of up to 1.4 kcal/mol.
  • Phi-value analysis indicated the first loop is structured in the transition state, while the second is unstructured.

Conclusions:

  • The study successfully extended protein engineering methods to secondary-structure interactions.
  • Results are consistent with simulated unfolding and homologous WW domain studies.
  • The findings provide new insights into protein folding mechanisms and the role of loops.