8DNE

CryoEM structure of the A.aeolicus WzmWzt transporter bound to ATP


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.50 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Molecular basis for polysaccharide recognition and modulated ATP hydrolysis by the O antigen ABC transporter.

Spellmon, N.Muszynski, A.Gorniak, I.Vlach, J.Hahn, D.Azadi, P.Zimmer, J.

(2022) Nat Commun 13: 5226-5226

  • DOI: https://doi.org/10.1038/s41467-022-32597-2
  • Primary Citation of Related Structures:  
    8DKU, 8DKY, 8DL0, 8DN8, 8DNC, 8DNE, 8DOU

  • PubMed Abstract: 

    O antigens are ubiquitous protective extensions of lipopolysaccharides in the extracellular leaflet of the Gram-negative outer membrane. Following biosynthesis in the cytosol, the lipid-linked polysaccharide is transported to the periplasm by the WzmWzt ABC transporter. Often, O antigen secretion requires the chemical modification of its elongating terminus, which the transporter recognizes via a carbohydrate-binding domain (CBD). Here, using components from A. aeolicus, we identify the O antigen structure with methylated mannose or rhamnose as its cap. Crystal and cryo electron microscopy structures reveal how WzmWzt recognizes this cap between its carbohydrate and nucleotide-binding domains in a nucleotide-free state. ATP binding induces drastic conformational changes of its CBD, terminating interactions with the O antigen. ATPase assays and site directed mutagenesis reveal reduced hydrolytic activity upon O antigen binding, likely to facilitate polymer loading into the ABC transporter. Our results elucidate critical steps in the recognition and translocation of polysaccharides by ABC transporters.


  • Organizational Affiliation

    Howard Hughes Medical Institute, University of Virginia School of Medicine, Charlottesville, VA, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
ABC transporter
A, C
404Aquifex aeolicus VF5Mutation(s): 0 
Gene Names: abcT4aq_1094
UniProt
Find proteins for O67181 (Aquifex aeolicus (strain VF5))
Explore O67181 
Go to UniProtKB:  O67181
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO67181
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Transport permease protein
B, D
256Aquifex aeolicus VF5Mutation(s): 0 
Gene Names: abcT3aq_1095
Membrane Entity: Yes 
UniProt
Find proteins for O67182 (Aquifex aeolicus (strain VF5))
Explore O67182 
Go to UniProtKB:  O67182
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO67182
Sequence Annotations
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.50 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
RECONSTRUCTIONcryoSPARC
MODEL REFINEMENTPHENIX

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United States--

Revision History  (Full details and data files)

  • Version 1.0: 2022-09-21
    Type: Initial release
  • Version 1.1: 2024-06-12
    Changes: Data collection, Refinement description