5UD8

Crystal Structure of Mutant Ig-like Domain


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.206 
  • R-Value Observed: 0.208 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Molecular basis for the loss-of-function effects of the Alzheimer's disease-associated R47H variant of the immune receptor TREM2.

Sudom, A.Talreja, S.Danao, J.Bragg, E.Kegel, R.Min, X.Richardson, J.Zhang, Z.Sharkov, N.Marcora, E.Thibault, S.Bradley, J.Wood, S.Lim, A.C.Chen, H.Wang, S.Foltz, I.N.Sambashivan, S.Wang, Z.

(2018) J Biol Chem 293: 12634-12646

  • DOI: 10.1074/jbc.RA118.002352
  • Primary Citation of Related Structures:  
    5UD7, 5UD8, 6B8O

  • PubMed Abstract: 
  • Triggering receptor expressed on myeloid cells 2 (TREM2) is an immune receptor expressed on the surface of microglia, macrophages, dendritic cells, and osteoclasts. The R47H TREM2 variant is a significant risk factor for late-onset Alzheimer's disease (AD), and the molecular basis of R47H TREM2 loss of function is an emerging area of TREM2 biology ...

    Triggering receptor expressed on myeloid cells 2 (TREM2) is an immune receptor expressed on the surface of microglia, macrophages, dendritic cells, and osteoclasts. The R47H TREM2 variant is a significant risk factor for late-onset Alzheimer's disease (AD), and the molecular basis of R47H TREM2 loss of function is an emerging area of TREM2 biology. Here, we report three high-resolution structures of the extracellular ligand-binding domains (ECDs) of R47H TREM2, apo-WT, and phosphatidylserine (PS)-bound WT TREM2 at 1.8, 2.2, and 2.2 Å, respectively. The structures reveal that Arg 47 plays a critical role in maintaining the structural features of the complementarity-determining region 2 (CDR2) loop and the putative positive ligand-interacting surface (PLIS), stabilizing conformations capable of ligand interaction. This is exemplified in the PS-bound structure, in which the CDR2 loop and PLIS drive critical interactions with PS via surfaces that are disrupted in the variant. Together with in vitro and in vivo characterization, our structural findings elucidate the molecular mechanism underlying loss of ligand binding, putative oligomerization, and functional activity of R47H TREM2. They also help unravel how decreased in vitro and in vivo stability of TREM2 contribute to loss of function in disease.


    Organizational Affiliation

    From Amgen Discovery Research, Amgen Inc., San Francisco, California 94080, zwang@amgen.com.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Triggering receptor expressed on myeloid cells 2 AB112Homo sapiensMutation(s): 1 
Gene Names: TREM2
Find proteins for Q9NZC2 (Homo sapiens)
Explore Q9NZC2 
Go to UniProtKB:  Q9NZC2
NIH Common Fund Data Resources
PHAROS:  Q9NZC2
Protein Feature View
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.206 
  • R-Value Observed: 0.208 
  • Space Group: P 2 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 23.79α = 90
b = 62.53β = 90
c = 125.27γ = 90
Software Package:
Software NamePurpose
MOSFLMdata collection
SCALAdata scaling
PHENIXrefinement
PDB_EXTRACTdata extraction
MOSFLMdata reduction

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2018-04-04
    Type: Initial release
  • Version 1.1: 2019-04-17
    Changes: Data collection, Database references