Biological Assembly 1  

 3D View: Structure

Global Symmetry: Icosahedral - I  (3D View)
Global Stoichiometry: Hetero 240-mer - A60B60C60D60 

Biological assembly 1 assigned by authors and generated by (software)

Macromolecule Content

• Total Structure Weight: 80.55 kDa 
• Atom Count: 724 
• Modelled Residue Count: 724 
• Deposited Residue Count: 724 
• Unique protein chains: 7

1XYR

Poliovirus 135S cell entry intermediate

• DOI: 10.2210/pdb1XYR/pdb
• EMDataResource: EMD-1144

• Classification: VIRUS
• Organism(s): Human poliovirus 1
• Mutation(s): No 


• Deposited: 2004-11-10 Released: 2005-08-02 
• Deposition Author(s): Bubeck, D., Filman, D.J., Cheng, N., Steven, A.C., Hogle, J.M., Belnap, D.M.

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Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 11.0 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Literature

The structure of the poliovirus 135S cell entry intermediate at 10-angstrom resolution reveals the location of an externalized polypeptide that binds to membranes.

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

(2005) J Virol 79: 7745-7755

• PubMed: 15919927 
• DOI: 10.1128/JVI.79.12.7745-7755.2005
• Primary Citation of Related Structures:  
  1XYR


• PubMed Abstract: 
  

Poliovirus provides a well-characterized system for understanding how nonenveloped viruses enter and infect cells. Upon binding its receptor, poliovirus undergoes an irreversible conformational change to the 135S cell entry intermediate. This transition involves shifts of the capsid protein beta barrels, accompanied by the externalization of VP4 and the N terminus of VP1. Both polypeptides associate with membranes and are postulated to facilitate entry by forming a translocation pore for the viral RNA. We have calculated cryo-electron microscopic reconstructions of 135S particles that permit accurate placement of the beta barrels, loops, and terminal extensions of the capsid proteins. The reconstructions and resulting models indicate that each N terminus of VP1 exits the capsid though an opening in the interface between VP1 and VP3 at the base of the canyon that surrounds the fivefold axis. Comparison with reconstructions of 135S particles in which the first 31 residues of VP1 were proteolytically removed revealed that the externalized N terminus is located near the tips of propeller-like features surrounding the threefold axes rather than at the fivefold axes, as had been proposed in previous models. These observations have forced a reexamination of current models for the role of the 135S particle in transmembrane pore formation and suggest testable alternatives.

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Organizational Affiliation: 

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

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Genome polyprotein, Coat protein VP1	1	232	Human poliovirus 1	Mutation(s): 0  EC: 3.4.22.29 (UniProt), 3.6.1.15 (UniProt), 3.4.22.28 (UniProt), 2.7.7.48 (UniProt)
Find proteins for P03300 (Poliovirus type 1 (strain Mahoney)) Explore P03300  Go to UniProtKB:  P03300

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Genome polyprotein, Coat protein VP2	2	237	Human poliovirus 1	Mutation(s): 0  EC: 3.4.22.29 (UniProt), 3.6.1.15 (UniProt), 3.4.22.28 (UniProt), 2.7.7.48 (UniProt)
Find proteins for P03300 (Poliovirus type 1 (strain Mahoney)) Explore P03300  Go to UniProtKB:  P03300

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
Genome polyprotein, Coat protein VP3	3	182	Human poliovirus 1	Mutation(s): 0  EC: 3.4.22.29 (UniProt), 3.6.1.15 (UniProt), 3.4.22.28 (UniProt), 2.7.7.48 (UniProt)
Find proteins for P03300 (Poliovirus type 1 (strain Mahoney)) Explore P03300  Go to UniProtKB:  P03300

Entity ID: 4
Molecule	Chains	Sequence Length	Organism	Details	Image
Genome polyprotein, Coat protein VP3	5	12	Human poliovirus 1	Mutation(s): 0  EC: 3.4.22.29 (UniProt), 3.6.1.15 (UniProt), 3.4.22.28 (UniProt), 2.7.7.48 (UniProt)
Find proteins for P03300 (Poliovirus type 1 (strain Mahoney)) Explore P03300  Go to UniProtKB:  P03300

Entity ID: 5
Molecule	Chains	Sequence Length	Organism	Details	Image
Genome polyprotein, Coat protein VP3	6	36	Human poliovirus 1	Mutation(s): 0  EC: 3.4.22.29 (UniProt), 3.6.1.15 (UniProt), 3.4.22.28 (UniProt), 2.7.7.48 (UniProt)
Find proteins for P03300 (Poliovirus type 1 (strain Mahoney)) Explore P03300  Go to UniProtKB:  P03300

Entity ID: 6
Molecule	Chains	Sequence Length	Organism	Details	Image
Genome polyprotein, Coat protein VP2	7	14	Human poliovirus 1	Mutation(s): 0  EC: 3.4.22.29 (UniProt), 3.6.1.15 (UniProt), 3.4.22.28 (UniProt), 2.7.7.48 (UniProt)
Find proteins for P03300 (Poliovirus type 1 (strain Mahoney)) Explore P03300  Go to UniProtKB:  P03300

Entity ID: 7
Molecule	Chains	Sequence Length	Organism	Details	Image
Genome polyprotein, Coat protein VP1	8	11	Human poliovirus 1	Mutation(s): 0  EC: 3.4.22.29 (UniProt), 3.6.1.15 (UniProt), 3.4.22.28 (UniProt), 2.7.7.48 (UniProt)
Find proteins for P03300 (Poliovirus type 1 (strain Mahoney)) Explore P03300  Go to UniProtKB:  P03300

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 11.0 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2004-11-10 
• Released Date: 2005-08-02 
Deposition Author(s): Bubeck, D., Filman, D.J., Cheng, N., Steven, A.C., Hogle, J.M., Belnap, D.M.

Revision History  

• Version 1.0: 2005-08-02
  Type: Initial release
  
• Version 1.1: 2008-04-30
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2018-07-18
  Changes: Data collection