6QU8

Adenovirus Serotype 26 (Ad26) in complex with sialic acid, pH8.0


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.19 Å
  • R-Value Free: 0.172 
  • R-Value Work: 0.142 
  • R-Value Observed: 0.143 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 2.2 of the entry. See complete history


Literature

Human adenovirus type 26 uses sialic acid-bearing glycans as a primary cell entry receptor.

Baker, A.T.Mundy, R.M.Davies, J.A.Rizkallah, P.J.Parker, A.L.

(2019) Sci Adv 5: eaax3567-eaax3567

  • DOI: https://doi.org/10.1126/sciadv.aax3567
  • Primary Citation of Related Structures:  
    6FJO, 6QU6, 6QU8

  • PubMed Abstract: 

    Adenoviruses are clinically important agents. They cause respiratory distress, gastroenteritis, and epidemic keratoconjunctivitis. As non-enveloped, double-stranded DNA viruses, they are easily manipulated, making them popular vectors for therapeutic applications, including vaccines. Species D adenovirus type 26 (HAdV-D26) is both a cause of EKC and other diseases and a promising vaccine vector. HAdV-D26-derived vaccines are under investigation as protective platforms against HIV, Zika, and respiratory syncytial virus infections and are in phase 3 clinical trials for Ebola. We recently demonstrated that HAdV-D26 does not use CD46 or Desmoglein-2 as entry receptors, while the putative interaction with coxsackie and adenovirus receptor is low affinity and unlikely to represent the primary cell receptor. Here, we establish sialic acid as a primary entry receptor used by HAdV-D26. We demonstrate that removal of cell surface sialic acid inhibits HAdV-D26 infection, and provide a high-resolution crystal structure of HAdV-D26 fiber-knob in complex with sialic acid.


  • Organizational Affiliation

    Division of Cancer and Genetics, School of Medicine, Cardiff University, Heath Park, Cardiff CF14 4XN, UK.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Fiber212Human adenovirus 26Mutation(s): 0 
UniProt
Find proteins for A4ZKM1 (Human adenovirus 26)
Explore A4ZKM1 
Go to UniProtKB:  A4ZKM1
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA4ZKM1
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.19 Å
  • R-Value Free: 0.172 
  • R-Value Work: 0.142 
  • R-Value Observed: 0.143 
  • Space Group: P 21 3
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 85.92α = 90
b = 85.92β = 90
c = 85.92γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
Aimlessdata scaling
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2019-09-18
    Type: Initial release
  • Version 1.1: 2019-09-25
    Changes: Data collection, Database references
  • Version 1.2: 2020-07-01
    Changes: Data collection
  • Version 2.0: 2020-07-08
    Changes: Advisory, Atomic model, Data collection, Derived calculations
  • Version 2.1: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Data collection, Derived calculations, Structure summary
  • Version 2.2: 2024-01-24
    Changes: Data collection, Database references, Refinement description, Structure summary