5A20

Structure of bacteriophage SPP1 head-to-tail interface filled with DNA and tape measure protein

Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 7.60 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

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This is version 1.2 of the entry. See complete history. 


Literature

Structural Rearrangements in the Phage Head-to-Tail Interface During Assembly and Infection.

Chaban, Y., Lurz, R., Brasiles, S., Cornilleau, C., Karreman, M., Zinn-Justin, S., Tavares, P., Orlova, E.V.

(2015) Proc Natl Acad Sci U S A 112: 7009

  • DOI: 10.1073/pnas.1504039112
  • Primary Citation of Related Structures:  
    5A21, 5A20

  • PubMed Abstract: 

    • Many icosahedral viruses use a specialized portal vertex to control genome encapsidation and release from the viral capsid. In tailed bacteriophages, the portal system is connected to a tail structure that provides the pipeline for genome delivery to the host cell ...

    Many icosahedral viruses use a specialized portal vertex to control genome encapsidation and release from the viral capsid. In tailed bacteriophages, the portal system is connected to a tail structure that provides the pipeline for genome delivery to the host cell. We report the first, to our knowledge, subnanometer structures of the complete portal-phage tail interface that mimic the states before and after DNA release during phage infection. They uncover structural rearrangements associated with intimate protein-DNA interactions. The portal protein gp6 of bacteriophage SPP1 undergoes a concerted reorganization of the structural elements of its central channel during interaction with DNA. A network of protein-protein interactions primes consecutive binding of proteins gp15 and gp16 to extend and close the channel. This critical step that prevents genome leakage from the capsid is achieved by a previously unidentified allosteric mechanism: gp16 binding to two different regions of gp15 drives correct positioning and folding of an inner gp16 loop to interact with equivalent loops of the other gp16 subunits. Together, these loops build a plug that closes the channel. Gp16 then fastens the tail to yield the infectious virion. The gatekeeper system opens for viral genome exit at the beginning of infection but recloses afterward, suggesting a molecular diaphragm-like mechanism to control DNA efflux. The mechanisms described here, controlling the essential steps of phage genome movements during virus assembly and infection, are likely to be conserved among long-tailed phages, the largest group of viruses in the Biosphere.

    Organizational Affiliation: 

    Institute of Structural and Molecular Biology, Birkbeck College, London WC1E 7HX, United Kingdom; tavares@vms.cnrs-gif.fr e.orlova@mail.cryst.bbk.ac.uk.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
PORTAL PROTEINA, B503Bacillus phage SPP1Mutation(s): 0 
Gene Names: 6, siz
Find proteins for P54309 (Bacillus phage SPP1)
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Go to UniProtKB:  P54309
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
15 PROTEINC, D102Bacillus phage SPP1Mutation(s): 0 
Gene Names: 15
Find proteins for Q38584 (Bacillus phage SPP1)
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
HEAD COMPLETION PROTEIN GP16E, F109Bacillus phage SPP1Mutation(s): 0 
Gene Names: 16
Find proteins for O48446 (Bacillus phage SPP1)
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
TAIL-TO-HEAD JOINING PROTEIN GP17G134Bacillus phage SPP1Mutation(s): 0 
Find proteins for O48448 (Bacillus phage SPP1)
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Entity ID: 5
MoleculeChainsSequence LengthOrganismDetailsImage
MAJOR TAIL PROTEIN GP17.1H177Bacillus phage SPP1Mutation(s): 0 
Gene Names: 17.1
Find proteins for O48449 (Bacillus phage SPP1)
Explore O48449 
Go to UniProtKB:  O48449
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 7.60 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: 2015-06-03
    Type: Initial release
  • Version 1.1: 2015-06-17
    Changes: Database references
  • Version 1.2: 2017-08-23
    Changes: Data collection