8TER

Tropomyosin-receptor kinase fused gene protein (TRK-fused gene protein; TFG) Low Complexity Domain (residues 237-327) P285L mutant, amyloid fiber


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.59 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: HELICAL 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Fibril structures of TFG protein mutants validate the identification of TFG as a disease-related amyloid protein by the IMPAcT method.

Rosenberg, G.M.Abskharon, R.Boyer, D.R.Ge, P.Sawaya, M.R.Eisenberg, D.S.

(2023) PNAS Nexus 2: pgad402-pgad402

  • DOI: https://doi.org/10.1093/pnasnexus/pgad402
  • Primary Citation of Related Structures:  
    8TEQ, 8TER

  • PubMed Abstract: 

    We previously presented a bioinformatic method for identifying diseases that arise from a mutation in a protein's low-complexity domain that drives the protein into pathogenic amyloid fibrils. One protein so identified was the tropomyosin-receptor kinase-fused gene protein (TRK-fused gene protein or TFG). Mutations in TFG are associated with degenerative neurological conditions. Here, we present experimental evidence that confirms our prediction that these conditions are amyloid-related. We find that the low-complexity domain of TFG containing the disease-related mutations G269V or P285L forms amyloid fibrils, and we determine their structures using cryo-electron microscopy (cryo-EM). These structures are unmistakably amyloid in nature and confirm the propensity of the mutant TFG low-complexity domain to form amyloid fibrils. Also, despite resulting from a pathogenic mutation, the fibril structures bear some similarities to other amyloid structures that are thought to be nonpathogenic and even functional, but there are other factors that support these structures' relevance to disease, including an increased propensity to form amyloid compared with the wild-type sequence, structure-stabilizing influence from the mutant residues themselves, and double-protofilament amyloid cores. Our findings elucidate two potentially disease-relevant structures of a previously unknown amyloid and also show how the structural features of pathogenic amyloid fibrils may not conform to the features commonly associated with pathogenicity.


  • Organizational Affiliation

    Department of Chemistry and Biochemistry, UCLA-DOE Institute, Molecular Biology Institute, UCLA, Los Angeles, CA 90095, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
TRK-fused gene protein Low Complexity Domain P285L mutant
A, B, C, D, E
A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T
358Purpureocillium lilacinumHomo sapiens
This entity is chimeric
Mutation(s): 1 
Gene Names: PCL_01928TFG
UniProt & NIH Common Fund Data Resources
Find proteins for Q92734 (Homo sapiens)
Explore Q92734 
Go to UniProtKB:  Q92734
PHAROS:  Q92734
GTEx:  ENSG00000114354 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ92734
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.59 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: HELICAL 
EM Software:
TaskSoftware PackageVersion
RECONSTRUCTIONRELION
MODEL REFINEMENTPHENIX

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute on Aging (NIH/NIA)United StatesR01AG048120
National Institutes of Health/National Institute on Aging (NIH/NIA)United StatesR01AG07895
National Institutes of Health/Office of the DirectorUnited States1S10OD018111
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United States1U24GM116792
National Science Foundation (NSF, United States)United StatesDBI-1338135
National Science Foundation (NSF, United States)United StatesDMR-1548924

Revision History  (Full details and data files)

  • Version 1.0: 2023-12-20
    Type: Initial release
  • Version 1.1: 2023-12-27
    Changes: Database references