Functional insights from biophysical study of TREM2 interactions with apoE and Aβ1-42

Daniel L. Kober, Melissa D. Stuchell-Brereton, Colin E. Kluender, Hunter B. Dean, Michael R. Strickland, Deborah F. Steinberg, Samantha S. Nelson, Berevan Baban, David M. Holtzman, Carl Frieden, Jennifer Alexander-Brett, Erik D. Roberson, Yuhua Song, Tom J. Brett

Research output: Contribution to journalArticlepeer-review

25 Scopus citations


Introduction: Triggering receptor expressed on myeloid cells-2 (TREM2) is an immune receptor expressed on microglia that also can become soluble (sTREM2). How TREM2 engages different ligands remains poorly understood. Methods: We used comprehensive biolayer interferometry (BLI) analysis to investigate TREM2 and sTREM2 interactions with apolipoprotein E (apoE) and monomeric amyloid beta (Aβ) (mAβ42). Results: TREM2 engagement of apoE was protein mediated with little effect of lipidation, showing slight affinity differences between isoforms (E4 > E3 > E2). Another family member, TREML2, did not bind apoE. Disease-linked TREM2 variants within a “basic patch” minimally impact apoE binding. Instead, TREM2 uses a unique hydrophobic surface to bind apoE, which requires the apoE hinge region. TREM2 and sTREM2 directly bind mAβ42 and potently inhibit Aβ42 polymerization, suggesting a potential role for soluble sTREM2 in preventing AD pathogenesis. Discussion: These findings demonstrate that TREM2 has at least two ligand-binding surfaces that might be therapeutic targets and uncovers a potential function for sTREM2 in directly inhibiting Aβ polymerization.

Original languageEnglish (US)
Pages (from-to)475-488
Number of pages14
JournalAlzheimer's and Dementia
Issue number3
StatePublished - Mar 2021
Externally publishedYes


  • Alzheimer's disease
  • amyloid beta
  • apolipoprotein E
  • microglia
  • neurodegeneration
  • neuroinflammation
  • TREM2

ASJC Scopus subject areas

  • Epidemiology
  • Health Policy
  • Developmental Neuroscience
  • Clinical Neurology
  • Geriatrics and Gerontology
  • Psychiatry and Mental health
  • Cellular and Molecular Neuroscience


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