5JJ3

Refined Structure of the Mature Virion Conformation of P22 Portal Protein


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 7 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.239 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Portal protein functions akin to a DNA-sensor that couples genome-packaging to icosahedral capsid maturation.

Lokareddy, R.K.Sankhala, R.S.Roy, A.Afonine, P.V.Motwani, T.Teschke, C.M.Parent, K.N.Cingolani, G.

(2017) Nat Commun 8: 14310-14310

  • DOI: 10.1038/ncomms14310
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Tailed bacteriophages and herpesviruses assemble infectious particles via an empty precursor capsid (or 'procapsid') built by multiple copies of coat and scaffolding protein and by one dodecameric portal protein. Genome packaging triggers rearrangeme ...

    Tailed bacteriophages and herpesviruses assemble infectious particles via an empty precursor capsid (or 'procapsid') built by multiple copies of coat and scaffolding protein and by one dodecameric portal protein. Genome packaging triggers rearrangement of the coat protein and release of scaffolding protein, resulting in dramatic procapsid lattice expansion. Here, we provide structural evidence that the portal protein of the bacteriophage P22 exists in two distinct dodecameric conformations: an asymmetric assembly in the procapsid (PC-portal) that is competent for high affinity binding to the large terminase packaging protein, and a symmetric ring in the mature virion (MV-portal) that has negligible affinity for the packaging motor. Modelling studies indicate the structure of PC-portal is incompatible with DNA coaxially spooled around the portal vertex, suggesting that newly packaged DNA triggers the switch from PC- to MV-conformation. Thus, we propose the signal for termination of 'Headful Packaging' is a DNA-dependent symmetrization of portal protein.


    Organizational Affiliation

    Department of Biochemistry and Molecular Biology, Thomas Jefferson University, 233 South 10th Street, Philadelphia, Pennsylvania 19107, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Portal protein
A, B, C, D, E, F, G, H, I, J, K, L
725Salmonella phage P22Mutation(s): 0 
Gene Names: 1
Find proteins for P26744 (Salmonella phage P22)
Go to UniProtKB:  P26744
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 7 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.239 
  • Space Group: I 4
Unit Cell:
Length (Å)Angle (°)
a = 409.043α = 90.00
b = 409.043β = 90.00
c = 260.000γ = 90.00
Software Package:
Software NamePurpose
PHENIXphasing
HKL-2000data scaling
HKL-2000data reduction
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical SciencesUnited StatesGM100888
National Institutes of Health/National Cancer InstituteUnited StatesP30CA56036

Revision History 

  • Version 1.0: 2017-02-08
    Type: Initial release
  • Version 1.1: 2017-02-15
    Type: Database references
  • Version 1.2: 2017-09-27
    Type: Author supporting evidence