Head decoration protein from the hyperthermophilic phage P74-26

Experimental Data Snapshot

  • Resolution: 1.69 Å
  • R-Value Free: 0.213 
  • R-Value Work: 0.179 
  • R-Value Observed: 0.182 

wwPDB Validation   3D Report Full Report

This is version 1.3 of the entry. See complete history


A Hyperthermophilic Phage Decoration Protein Suggests Common Evolutionary Origin with Herpesvirus Triplex Proteins and an Anti-CRISPR Protein.

Stone, N.P.Hilbert, B.J.Hidalgo, D.Halloran, K.T.Lee, J.Sontheimer, E.J.Kelch, B.A.

(2018) Structure 26: 936-947.e3

  • DOI: https://doi.org/10.1016/j.str.2018.04.008
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Virus capsids are protein shells that protect the viral genome from environmental assaults, while maintaining the high internal pressure of the tightly packaged genome. To elucidate how capsids maintain stability under harsh conditions, we investigated the capsid components of the hyperthermophilic phage P74-26. We determined the structure of capsid protein gp87 and show that it has the same fold as decoration proteins in many other phages, despite lacking significant sequence homology. We also find that gp87 is significantly more stable than mesophilic homologs. Our analysis of the gp87 structure reveals that the core "β tulip" domain is conserved in trimeric capsid components across numerous double-stranded DNA viruses, including Herpesviruses. Moreover, this β barrel domain is found in anti-CRISPR protein AcrIIC1, suggesting a mechanism for the evolution of this Cas9 inhibitor. Our work illustrates the principles for increased stability of gp87, and extends the evolutionary reach of the β tulip domain.

  • Organizational Affiliation

    Department of Biochemistry and Molecular Pharmacology, University of Massachusetts Medical School, Worcester, MA 01655, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Head decoration protein145Oshimavirus P7426Mutation(s): 0 
Gene Names: P74p87
Find proteins for A7XXR5 (Thermus virus P74-26)
Explore A7XXR5 
Go to UniProtKB:  A7XXR5
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA7XXR5
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.69 Å
  • R-Value Free: 0.213 
  • R-Value Work: 0.179 
  • R-Value Observed: 0.182 
  • Space Group: P 63
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 89.516α = 90
b = 89.516β = 90
c = 31.39γ = 120
Software Package:
Software NamePurpose
HKL-3000data collection
HKL-3000data scaling
Cootmodel building
HKL-3000data reduction

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
The Pew Charitable TrustsUnited States--

Revision History  (Full details and data files)

  • Version 1.0: 2018-02-21
    Type: Initial release
  • Version 1.1: 2018-06-06
    Changes: Data collection, Database references
  • Version 1.2: 2018-07-18
    Changes: Data collection, Database references
  • Version 1.3: 2024-03-13
    Changes: Data collection, Database references