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Prion protein mPrP[F175A](121-231): structure and stability in solution.

Barbara Christen1, Simone Hornemann, Fred F Damberger

  • 1Institute of Molecular Biology and Biophysics, ETH Zurich, Schafmattstrasse 20, CH-8093 Zurich, Switzerland.

Journal of Molecular Biology
|August 28, 2012
PubMed
Summary

Investigating the role of phenylalanine at position 175 (F175) in prion protein (PrP(C)) structure, this study found that replacing F175 with alanine in mouse prion protein (mPrP[F175A]) alters its loop conformation and reduces thermal stability.

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Published on: November 7, 2012

Area of Science:

  • Structural biology
  • Biochemistry
  • Neuroscience

Background:

  • Prion proteins (PrP(C)) are crucial for normal cellular function.
  • Aromatic residue interactions, like Y169-F175, stabilize PrP(C) structure.
  • F175 is highly conserved across mammalian prion protein sequences.

Purpose of the Study:

  • To elucidate the structural and functional significance of phenylalanine at position 175 (F175) in prion protein (PrP(C)).
  • To characterize the impact of substituting F175 with alanine on mouse prion protein (mPrP) structure and stability.

Main Methods:

  • Nuclear Magnetic Resonance (NMR) spectroscopy was used to determine the solution structure of the mPrP[F175A](121-231) variant.
  • Thermal unfolding experiments were conducted to assess the stability of the mPrP[F175A](121-231) variant.

Main Results:

  • The NMR structure of mPrP[F175A](121-231) revealed a typical PrP(C)-fold with a well-defined 3(10)-helical β2-α2 loop, exhibiting "rigid-loop PrP(C)" behavior.
  • Unlike the previously studied mPrP[Y169A] variant, mPrP[F175A](121-231) exhibited a unique reduction in thermal unfolding temperature by 8°C compared to other rigid-loop variants.
  • This suggests F175 plays a distinct role in maintaining PrP(C) stability.

Conclusions:

  • The F175 residue contributes to the stability of the prion protein's cellular form (PrP(C)).
  • Single-residue substitutions can significantly impact PrP(C) conformation and thermal stability.
  • Further research can refine understanding of PrP(C) function based on these structural insights.