6H5S

Cryo-EM map of in vitro assembled Measles virus N into nucleocapsid-like particles (NCLPs) bound to viral genomic 5-prime RNA hexamers.


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.30 Å
  • Aggregation State: HELICAL ARRAY 
  • Reconstruction Method: HELICAL 

wwPDB Validation   3D Report Full Report


This is version 1.5 of the entry. See complete history


Literature

Assembly and cryo-EM structures of RNA-specific measles virus nucleocapsids provide mechanistic insight into paramyxoviral replication.

Desfosses, A.Milles, S.Jensen, M.R.Guseva, S.Colletier, J.P.Maurin, D.Schoehn, G.Gutsche, I.Ruigrok, R.W.H.Blackledge, M.

(2019) Proc Natl Acad Sci U S A 116: 4256-4264

  • DOI: https://doi.org/10.1073/pnas.1816417116
  • Primary Citation of Related Structures:  
    6H5Q, 6H5S

  • PubMed Abstract: 

    Assembly of paramyxoviral nucleocapsids on the RNA genome is an essential step in the viral cycle. The structural basis of this process has remained obscure due to the inability to control encapsidation. We used a recently developed approach to assemble measles virus nucleocapsid-like particles on specific sequences of RNA hexamers (poly-Adenine and viral genomic 5') in vitro, and determined their cryoelectron microscopy maps to 3.3-Å resolution. The structures unambiguously determine 5' and 3' binding sites and thereby the binding-register of viral genomic RNA within nucleocapsids. This observation reveals that the 3' end of the genome is largely exposed in fully assembled measles nucleocapsids. In particular, the final three nucleotides of the genome are rendered accessible to the RNA-dependent RNA polymerase complex, possibly enabling efficient RNA processing. The structures also reveal local and global conformational changes in the nucleoprotein upon assembly, in particular involving helix α6 and helix α13 that form edges of the RNA binding groove. Disorder is observed in the bound RNA, localized at one of the two backbone conformational switch sites. The high-resolution structure allowed us to identify putative nucleobase interaction sites in the RNA-binding groove, whose impact on assembly kinetics was measured using real-time NMR. Mutation of one of these sites, R195, whose sidechain stabilizes both backbone and base of a bound nucleic acid, is thereby shown to be essential for nucleocapsid-like particle assembly.


  • Organizational Affiliation

    Commissariat à l'Energie Atomique, Institut de Biologie Structurale, Université Grenoble Alpes, CNRS, 38000 Grenoble, France.


Macromolecules

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
NucleocapsidA [auth C]415Measles morbillivirusMutation(s): 0 
UniProt
Find proteins for Q77M43 (Measles virus (strain Edmonston-Moraten vaccine))
Explore Q77M43 
Go to UniProtKB:  Q77M43
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ77M43
Sequence Annotations
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  • Reference Sequence

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Entity ID: 2
MoleculeChains LengthOrganismImage
RNA (5'-R(*AP*CP*CP*AP*GP*A)-3')B [auth E]6synthetic construct
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.30 Å
  • Aggregation State: HELICAL ARRAY 
  • Reconstruction Method: HELICAL 

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
GRALFranceANR-10-LABX-49-01
FRISBIFranceANR-10-INSB-05-02
European CommissionEMBOCOFUND2012, GA-2012-600394
Fondation Recherche Medicale (FRM)FranceARF20160936266

Revision History  (Full details and data files)

  • Version 1.0: 2019-06-12
    Type: Initial release
  • Version 1.1: 2019-07-03
    Changes: Data collection, Derived calculations
  • Version 1.2: 2019-11-06
    Changes: Data collection, Database references
  • Version 1.3: 2019-12-18
    Changes: Other
  • Version 1.4: 2020-07-01
    Changes: Refinement description
  • Version 1.5: 2024-05-15
    Changes: Data collection, Database references