Exciting new tools for studying TREM2 in dementia

Area of Science:

• Neuroscience
• Immunology
• Structural Biology

Background:

• Triggering receptor expressed myeloid cells 2 (TREM2) is a key genetic risk factor for Alzheimer's disease (AD).
• Understanding TREM2's function is crucial for developing AD therapies.

Purpose of the Study:

• To generate and structurally characterize antibody single-chain variable fragments (scFvs) targeting the immunoglobulin (Ig)-like domain of human TREM2.
• To investigate the functional consequences of TREM2-scFv interactions.

Main Methods:

• Generation of antibody single-chain variable fragments (scFvs) against human TREM2.
• Co-crystallization of TREM2-scFv complexes.
• X-ray crystallography to determine high-resolution structures.
• Functional assays to assess the impact of scFvs on TREM2.

Main Results:

• Two distinct co-crystal structures of human TREM2 Ig-like domain with scFvs were determined.
• The structures reveal specific binding interfaces and conformational effects on TREM2.
• Functional characterization demonstrated that these scFvs modulate TREM2 activity.

Conclusions:

• The generated scFvs provide valuable tools for studying TREM2 structure and function.
• These findings contribute to a deeper understanding of TREM2's role in Alzheimer's disease.
• The structural and functional data may inform the design of novel therapeutic strategies for AD.