Solid-state NMR sequential assignment of an Amyloid-β(1-42) fibril polymorph.

Area of Science:

• Neuroscience
• Biochemistry
• Structural Biology

Background:

• Amyloid-beta (Aβ) fibril formation is central to Alzheimer's disease (AD) pathogenesis.
• Understanding the high-resolution structure of Aβ fibrils is vital for elucidating AD's molecular mechanisms.

Purpose of the Study:

• To provide the sequential resonance assignment for a specific polymorph of Aβ(1-42) fibrils.
• To characterize the structural dynamics of Aβ(1-42) fibrils using solid-state NMR.

Main Methods:

• Solid-state Nuclear Magnetic Resonance (NMR) spectroscopy was employed.
• Sequential resonance assignment was performed on Aβ(1-42) fibril polymorphs.

Main Results:

• The study achieved sequential resonance assignment for a polymorph of Aβ(1-42) fibrils.
• Most of the Aβ(1-42) fibril structure was found to be rigid.
• A specific segment of 4 residues (11-14) exhibited high dynamics and was not visible via solid-state NMR.

Conclusions:

• The structural and dynamic characterization of Aβ(1-42) fibrils provides insights into Alzheimer's disease pathology.
• The identified dynamic region may play a role in fibril formation or interaction.