GA1 bacteriophage portal protein

Experimental Data Snapshot

  • Resolution: 3.20 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report

This is version 1.2 of the entry. See complete history


Cryo-EM Structures of Two Bacteriophage Portal Proteins Provide Insights for Antimicrobial Phage Engineering.

Javed, A.Villanueva, H.Shataer, S.Vasciaveo, S.Savva, R.Orlova, E.V.

(2021) Viruses 13

  • DOI: https://doi.org/10.3390/v13122532
  • Primary Citation of Related Structures:  
    7PV2, 7PV4

  • PubMed Abstract: 

    Widespread antibiotic resistance has returned attention to bacteriophages as a means of managing bacterial pathogenesis. Synthetic biology approaches to engineer phages have demonstrated genomic editing to broaden natural host ranges, or to optimise microbicidal action. Gram positive pathogens cause serious pastoral animal and human infections that are especially lethal in newborns. Such pathogens are targeted by the obligate lytic phages of the Salasmaviridae and Guelinviridae families. These phages have relatively small ~20 kb linear protein-capped genomes and their compact organisation, relatively few structural elements, and broad host range, are appealing from a phage-engineering standpoint. In this study, we focus on portal proteins, which are core elements for the assembly of such tailed phages. The structures of dodecameric portal complexes from Salasmaviridae phage GA1, which targets Bacillus pumilus , and Guelinviridae phage phiCPV4 that infects Clostridium perfringens , were determined at resolutions of 3.3 Å and 2.9 Å, respectively. Both are found to closely resemble the related phi29 portal protein fold. However, the portal protein of phiCPV4 exhibits interesting differences in the clip domain. These structures provide new insights on structural diversity in Caudovirales portal proteins and will be essential for considerations in phage structural engineering.

  • Organizational Affiliation

    Department of Biological Sciences, Institute of Structural and Molecular Biology, Birkbeck College, Malet Street, London WC1E 7HX, UK.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Head-tail connector (Portal protein)
A, B, C, D, E
A, B, C, D, E, F, G, H, I, J, K, L
306Bacillus phage GA1Mutation(s): 0 
Gene Names: gene 10
Find proteins for Q9FZW5 (Bacillus phage GA-1)
Explore Q9FZW5 
Go to UniProtKB:  Q9FZW5
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9FZW5
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 3.20 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Biotechnology and Biological Sciences Research Council (BBSRC)United KingdomBB/M009513
Biotechnology and Biological Sciences Research Council (BBSRC)United KingdomBB/R002622/1
Wellcome TrustUnited Kingdom202679/Z/16/Z
Wellcome TrustUnited Kingdom206166/Z/17/Z

Revision History  (Full details and data files)

  • Version 1.0: 2022-10-12
    Type: Initial release
  • Version 1.1: 2023-06-07
    Changes: Author supporting evidence, Refinement description, Source and taxonomy
  • Version 1.2: 2023-10-25
    Changes: Data collection, Database references, Refinement description