4RP8

Bacterial vitamin C transporter UlaA/SgaT in P21 form


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.36 Å
  • R-Value Free: 0.239 
  • R-Value Work: 0.197 
  • R-Value Observed: 0.199 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 1.4 of the entry. See complete history


Literature

Crystal structure of a phosphorylation-coupled vitamin C transporter.

Luo, P.Yu, X.Wang, W.Fan, S.Li, X.Wang, J.

(2015) Nat Struct Mol Biol 22: 238-241

  • DOI: https://doi.org/10.1038/nsmb.2975
  • Primary Citation of Related Structures:  
    4RP8, 4RP9

  • PubMed Abstract: 

    Bacteria use vitamin C (L-ascorbic acid) as a carbon source under anaerobic conditions. The phosphoenolpyruvate-dependent phosphotransferase system (PTS), comprising a transporter (UlaA), a IIB-like enzyme (UlaB) and a IIA-like enzyme (UlaC), is required for the anaerobic uptake of vitamin C and its phosphorylation to L-ascorbate 6-phosphate. Here, we present the crystal structures of vitamin C-bound UlaA from Escherichia coli in two conformations at 1.65-Å and 2.35-Å resolution. UlaA forms a homodimer and exhibits a new fold. Each UlaA protomer consists of 11 transmembrane segments arranged into a 'V-motif' domain and a 'core' domain. The V motifs form the interface between the two protomers, and the core-domain residues coordinate vitamin C. The alternating access of the substrate from the opposite side of the cell membrane may be achieved through rigid-body rotation of the core relative to the V motif.


  • Organizational Affiliation

    1] State Key Laboratory of Biomembrane and Membrane Biotechnology, School of Life Sciences, Tsinghua University, Beijing, China. [2] Center for Structural Biology, School of Life Sciences, Tsinghua University, Beijing, China.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Ascorbate-specific permease IIC component UlaAA,
B [auth C]
465Escherichia coli K-12Mutation(s): 0 
Gene Names: ulaAsgaTyjfSb4193JW5744
Membrane Entity: Yes 
UniProt
Find proteins for P39301 (Escherichia coli (strain K12))
Explore P39301 
Go to UniProtKB:  P39301
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP39301
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.36 Å
  • R-Value Free: 0.239 
  • R-Value Work: 0.197 
  • R-Value Observed: 0.199 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 83.781α = 90
b = 85.561β = 96.73
c = 88.954γ = 90
Software Package:
Software NamePurpose
Blu-Icedata collection
PHASERphasing
PHENIXrefinement
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

  • Released Date: 2015-03-04 
  • Deposition Author(s): Wang, J.W.

Revision History  (Full details and data files)

  • Version 1.0: 2015-03-04
    Type: Initial release
  • Version 1.1: 2015-03-11
    Changes: Structure summary
  • Version 1.2: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Data collection, Derived calculations, Structure summary
  • Version 1.3: 2022-08-24
    Changes: Database references, Structure summary
  • Version 1.4: 2023-11-08
    Changes: Data collection, Refinement description