6WQK

hnRNPA2 Low complexity domain (LCD) determined by cryoEM


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.10 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: HELICAL 

wwPDB Validation   3D Report Full Report


This is version 1.0 of the entry. See complete history


Literature

CryoEM structure of the low-complexity domain of hnRNPA2 and its conversion to pathogenic amyloid.

Lu, J.Cao, Q.Hughes, M.P.Sawaya, M.R.Boyer, D.R.Cascio, D.Eisenberg, D.S.

(2020) Nat Commun 11: 4090-4090

  • DOI: 10.1038/s41467-020-17905-y
  • Primary Citation of Related Structures:  
    6WQK, 6WPQ

  • PubMed Abstract: 
  • hnRNPA2 is a human ribonucleoprotein (RNP) involved in RNA metabolism. It forms fibrils both under cellular stress and in mutated form in neurodegenerative conditions. Previous work established that the C-terminal low-complexity domain (LCD) of hnRNPA2 fibrillizes under stress, and missense mutations in this domain are found in the disease multisystem proteinopathy (MSP) ...

    hnRNPA2 is a human ribonucleoprotein (RNP) involved in RNA metabolism. It forms fibrils both under cellular stress and in mutated form in neurodegenerative conditions. Previous work established that the C-terminal low-complexity domain (LCD) of hnRNPA2 fibrillizes under stress, and missense mutations in this domain are found in the disease multisystem proteinopathy (MSP). However, little is known at the atomic level about the hnRNPA2 LCD structure that is involved in those processes and how disease mutations cause structural change. Here we present the cryo-electron microscopy (cryoEM) structure of the hnRNPA2 LCD fibril core and demonstrate its capability to form a reversible hydrogel in vitro containing amyloid-like fibrils. Whereas these fibrils, like pathogenic amyloid, are formed from protein chains stacked into β-sheets by backbone hydrogen bonds, they display distinct structural differences: the chains are kinked, enabling non-covalent cross-linking of fibrils and disfavoring formation of pathogenic steric zippers. Both reversibility and energetic calculations suggest these fibrils are less stable than pathogenic amyloid. Moreover, the crystal structure of the disease-mutation-containing segment (D290V) of hnRNPA2 suggests that the replacement fundamentally alters the fibril structure to a more stable energetic state. These findings illuminate how molecular interactions promote protein fibril networks and how mutation can transform fibril structure from functional to a pathogenic form.


    Organizational Affiliation

    UCLA-DOE Institute, Molecular Biology Institute, Howard Hughes Medical Institute, Los Angeles, CA, USA. david@mbi.ucla.edu.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
MCherry fluorescent protein,Heterogeneous nuclear ribonucleoproteins A2/B1 chimeraA, B, C, D, E426Anaplasma marginaleHomo sapiens
This entity is chimeric
Mutation(s): 0 
Gene Names: mCherryHNRNPA2B1HNRPA2B1
UniProt & NIH Common Fund Data Resources
Find proteins for P22626 (Homo sapiens)
Explore P22626 
Go to UniProtKB:  P22626
PHAROS:  P22626
Find proteins for X5DSL3 (Anaplasma marginale)
Explore X5DSL3 
Go to UniProtKB:  X5DSL3
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.10 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: HELICAL 

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Science Foundation (NSF, United States)United States1616265
National Institutes of Health/National Institute on Aging (NIH/NIA)United StatesAG054022

Revision History  (Full details and data files)

  • Version 1.0: 2020-08-26
    Type: Initial release