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NMR solution structure of the human prion protein
1Institut für Molekularbiologie und Biophysik, Eidgenössische Technische Hochschule Hönggerberg, CH-8093 Zürich, Switzerland.
Summary
The structure of human prion protein (hPrP) reveals a globular domain and a disordered N-terminal tail. The tail length influences local protein structure, impacting prion disease transmission and immune responses.
Area of Science:
- Structural Biology
- Biochemistry
- Neuroscience
Background:
- The cellular prion protein (PrP) exists in multiple forms, with misfolding linked to neurodegenerative diseases.
- Understanding PrP structure is crucial for elucidating disease mechanisms and developing therapeutics.
Purpose of the Study:
- To determine the NMR structures of recombinant human prion protein (hPrP) and its C-terminal fragments.
- To investigate the influence of the N-terminal tail length on the protein's local conformation.
Main Methods:
- Nuclear Magnetic Resonance (NMR) spectroscopy was employed to resolve the three-dimensional structures.
- Comparative analysis of hPrP structures with different N-terminal tail lengths and with related species (murine and Syrian hamster PrP).
Main Results:
- Detailed structures of hPrP(23-230), hPrP(90-230), and hPrP(121-230) were obtained, revealing a globular domain and a flexible N-terminal tail.
- Specific regions within the globular domain (loop 167-171, helix 2 residues 187-194, helix 3 residues 219-228) exhibited increased structural disorder.
- The length of the N-terminal tail measurably influenced the helical states of residues 187-193 and 219-226, with longer tails favoring helical conformations.
Conclusions:
- Species-specific structural variations in PrP, particularly in helix 3 and a disordered loop, were identified.
- These structural differences are located in a region implicated in prion disease transmission barriers and immune interactions.
- The N-terminal tail's influence on local structure suggests a mechanism for modulating PrP's role in disease pathogenesis and interspecies transmission.