3J3P

Conformational Shift of a Major Poliovirus Antigen Confirmed by Immuno-Cryogenic Electron Microscopy: 135S Poliovirus and C3-Fab Complex


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 9.10 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Conformational shift of a major poliovirus antigen confirmed by immuno-cryogenic electron microscopy.

Lin, J.Cheng, N.Hogle, J.M.Steven, A.C.Belnap, D.M.

(2013) J Immunol 191: 884-891

  • DOI: 10.4049/jimmunol.1202014
  • Primary Citation of Related Structures:  
    3J3O, 3J3P

  • PubMed Abstract: 
  • Small, interfacial conformational changes occur in some Ag-Ab interactions. Using cryogenic electron microscopy (cryo-EM), we have demonstrated such changes in a major antigenic site of a poliovirus capsid protein. During cell entry, native human poliovirus (160S particle) converts to a cell entry intermediate (135S particle) and later to an RNA-released (80S) particle ...

    Small, interfacial conformational changes occur in some Ag-Ab interactions. Using cryogenic electron microscopy (cryo-EM), we have demonstrated such changes in a major antigenic site of a poliovirus capsid protein. During cell entry, native human poliovirus (160S particle) converts to a cell entry intermediate (135S particle) and later to an RNA-released (80S) particle. By mixing particles with Fabs of the neutralizing C3 mAb, we labeled the external loop connecting the B and C β-strands (BC loop) of the capsid protein VP1 (residues 95-105) in the 160S and 135S states. We then determined three-dimensional structures by cryo-EM and enhanced their interpretability by fitting high-resolution coordinates of C3 Fab and the capsid proteins into the density maps. Binding of C3 to either 160S or 135S particles caused residues of the BC loop, located on the tip of a prominent peak known as the "mesa," to move by an estimated 5 Å. C3 Abs are neutralizing and can bind bivalently. The orientation of the bound Fabs in our reconstructions suggests that C3 neutralizes poliovirus by binding two adjacent BC loops on the same mesa and inhibiting conformational changes in the viral capsid.


    Organizational Affiliation

    Department of Chemistry and Biochemistry, Brigham Young University, Provo, UT 84602, USA.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
C3 antibody, light chainA [auth L]219Mus musculusMutation(s): 0 
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
C3 antibody, heavy chainB [auth H]220Mus musculusMutation(s): 0 
Gene Names: Igh-1a
UniProt
Find proteins for P01865 (Mus musculus)
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Go to UniProtKB:  P01865
Protein Feature View
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Protein VP1C [auth 1]302Human poliovirus 1 MahoneyMutation(s): 0 
EC: 3.4.22.29 (UniProt), 3.6.1.15 (UniProt), 3.4.22.28 (UniProt), 2.7.7.48 (UniProt)
UniProt
Find proteins for P03300 (Poliovirus type 1 (strain Mahoney))
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Go to UniProtKB:  P03300
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  • Reference Sequence
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
Protein VP2D [auth 2]272Human poliovirus 1 MahoneyMutation(s): 0 
EC: 3.4.22.29 (UniProt), 3.6.1.15 (UniProt), 3.4.22.28 (UniProt), 2.7.7.48 (UniProt)
UniProt
Find proteins for P03300 (Poliovirus type 1 (strain Mahoney))
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Go to UniProtKB:  P03300
Protein Feature View
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  • Reference Sequence
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Entity ID: 5
MoleculeChainsSequence LengthOrganismDetailsImage
Protein VP3E [auth 3]238Human poliovirus 1 MahoneyMutation(s): 0 
EC: 3.4.22.29 (UniProt), 3.6.1.15 (UniProt), 3.4.22.28 (UniProt), 2.7.7.48 (UniProt)
UniProt
Find proteins for P03300 (Poliovirus type 1 (strain Mahoney))
Explore P03300 
Go to UniProtKB:  P03300
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 9.10 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-07-03
    Type: Initial release
  • Version 1.1: 2013-07-17
    Changes: Database references
  • Version 1.2: 2018-07-18
    Changes: Data collection