6QXM

Cryo-EM structure of T7 bacteriophage portal protein, 12mer, open valve


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.1 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

Structures of T7 bacteriophage portal and tail suggest a viral DNA retention and ejection mechanism.

Cuervo, A.Fabrega-Ferrer, M.Machon, C.Conesa, J.J.Fernandez, F.J.Perez-Luque, R.Perez-Ruiz, M.Pous, J.Vega, M.C.Carrascosa, J.L.Coll, M.

(2019) Nat Commun 10: 3746-3746

  • DOI: 10.1038/s41467-019-11705-9
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Double-stranded DNA bacteriophages package their genome at high pressure inside a procapsid through the portal, an oligomeric ring protein located at a unique capsid vertex. Once the DNA has been packaged, the tail components assemble on the portal t ...

    Double-stranded DNA bacteriophages package their genome at high pressure inside a procapsid through the portal, an oligomeric ring protein located at a unique capsid vertex. Once the DNA has been packaged, the tail components assemble on the portal to render the mature infective virion. The tail tightly seals the ejection conduit until infection, when its interaction with the host membrane triggers the opening of the channel and the viral genome is delivered to the host cell. Using high-resolution cryo-electron microscopy and X-ray crystallography, here we describe various structures of the T7 bacteriophage portal and fiber-less tail complex, which suggest a possible mechanism for DNA retention and ejection: a portal closed conformation temporarily retains the genome before the tail is assembled, whereas an open portal is found in the tail. Moreover, a fold including a seven-bladed β-propeller domain is described for the nozzle tail protein.


    Organizational Affiliation

    Centro Nacional de Biotecnología, (CNB-CSIC), Darwin 3, 28049, Madrid, Spain. jlcarras@cnb.csic.es.,Centro de Investigaciones Biológicas (CIB-CSIC), Ramiro de Maeztu 9, 28040, Madrid, Spain.,Institute for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology, Baldiri Reixac 10, 08028, Barcelona, Spain.,Centro Nacional de Biotecnología, (CNB-CSIC), Darwin 3, 28049, Madrid, Spain.,Abvance Biotech srl, Ave. Reina Victoria 32, 28003, Madrid, Spain.,Institut de Biologia Molecular de Barcelona (IBMB-CSIC), Baldiri Reixac 10, 08028, Barcelona, Spain. miquel.coll@irbbarcelona.org.,Institut de Biologia Molecular de Barcelona (IBMB-CSIC), Baldiri Reixac 10, 08028, Barcelona, Spain.,Institute for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology, Baldiri Reixac 10, 08028, Barcelona, Spain. miquel.coll@irbbarcelona.org.




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
547Enterobacteria phage T7Mutation(s): 0 
Find proteins for P03728 (Enterobacteria phage T7)
Go to UniProtKB:  P03728
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.1 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Spanish Ministry of Science, Innovation, and UniversitiesSpainBFU 2014-54181
Spanish Ministry of Science, Innovation, and UniversitiesSpainBFU2014-53550-P
Spanish Ministry of Science, Innovation, and UniversitiesSpainBFU2017-83720-P
Spanish Ministry of Science, Innovation, and UniversitiesSpainMDM-2014-0435
Spanish Ministry of Science, Innovation, and UniversitiesSpainSEV-2013-0347
Spanish Ministry of Science, Innovation, and UniversitiesSpainRYC-2011-09071
European Commission653706

Revision History 

  • Version 1.0: 2019-09-04
    Type: Initial release