6H7V

Crystal structure of BauA, the Ferric preacinetobactin receptor from Acinetobacter baumannii


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.54 Å
  • R-Value Free: 0.213 
  • R-Value Work: 0.183 
  • R-Value Observed: 0.185 

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Ligand Structure Quality Assessment 


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Literature

Preacinetobactin not acinetobactin is essential for iron uptake by the BauA transporter of the pathogenAcinetobacter baumannii.

Moynie, L.Serra, I.Scorciapino, M.A.Oueis, E.Page, M.G.Ceccarelli, M.Naismith, J.H.

(2018) Elife 7

  • DOI: 10.7554/eLife.42270
  • Primary Citation of Related Structures:  
    6H7F, 6H7V, 6HCP

  • PubMed Abstract: 
  • New strategies are urgently required to develop antibiotics. The siderophore uptake system has attracted considerable attention, but rational design of siderophore antibiotic conjugates requires knowledge of recognition by the cognate outer-membrane transporter ...

    New strategies are urgently required to develop antibiotics. The siderophore uptake system has attracted considerable attention, but rational design of siderophore antibiotic conjugates requires knowledge of recognition by the cognate outer-membrane transporter. Acinetobacter baumannii is a serious pathogen, which utilizes (pre)acinetobactin to scavenge iron from the host. We report the structure of the (pre)acinetobactin transporter BauA bound to the siderophore, identifying the structural determinants of recognition. Detailed biophysical analysis confirms that BauA recognises preacinetobactin. We show that acinetobactin is not recognised by the protein, thus preacinetobactin is essential for iron uptake. The structure shows and NMR confirms that under physiological conditions, a molecule of acinetobactin will bind to two free coordination sites on the iron preacinetobactin complex. The ability to recognise a heterotrimeric iron-preacinetobactin-acinetobactin complex may rationalize contradictory reports in the literature. These results open new avenues for the design of novel antibiotic conjugates (trojan horse) antibiotics.


    Organizational Affiliation

    The Rosalind Franklin Institute, Didcot, England.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Ligand-gated channel proteinA, B, C706Acinetobacter baumannii ATCC 19606 = CIP 70.34 = JCM 6841Mutation(s): 0 
Gene Names: BIT33_06105HMPREF0010_02301
Membrane Entity: Yes 
UniProt
Find proteins for D0CC21 (Acinetobacter baumannii (strain ATCC 19606 / DSM 30007 / JCM 6841 / CCUG 19606 / CIP 70.34 / NBRC 109757 / NCIMB 12457 / NCTC 12156 / 81))
Explore D0CC21 
Go to UniProtKB:  D0CC21
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupD0CC21
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
C8E
Query on C8E

Download Ideal Coordinates CCD File 
AA [auth C],
BA [auth C],
I [auth A],
M [auth B],
N [auth B],
AA [auth C],
BA [auth C],
I [auth A],
M [auth B],
N [auth B],
O [auth B],
P [auth B],
Q [auth B],
R [auth B],
X [auth C],
Y [auth C],
Z [auth C]
(HYDROXYETHYLOXY)TRI(ETHYLOXY)OCTANE
C16 H34 O5
FEOZZFHAVXYAMB-UHFFFAOYSA-N
 Ligand Interaction
EDO
Query on EDO

Download Ideal Coordinates CCD File 
D [auth A],
E [auth A],
F [auth A],
G [auth A],
H [auth A],
D [auth A],
E [auth A],
F [auth A],
G [auth A],
H [auth A],
J [auth B],
K [auth B],
L [auth B],
S [auth C],
T [auth C],
U [auth C],
V [auth C],
W [auth C]
1,2-ETHANEDIOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A, B, C L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.54 Å
  • R-Value Free: 0.213 
  • R-Value Work: 0.183 
  • R-Value Observed: 0.185 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 182.31α = 90
b = 220.42β = 98.65
c = 101.67γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
XSCALEdata scaling
Auto-Rickshawphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
United Kingdom--

Revision History  (Full details and data files)

  • Version 1.0: 2018-10-10
    Type: Initial release
  • Version 1.1: 2019-01-16
    Changes: Data collection, Database references, Structure summary