5J63

Crystal Structure of the N-terminal N-formyltransferase Domain (residues 1-306) of Escherichia coli Arna in Complex with UDP-Ara4N and Folinic Acid


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.284 
  • R-Value Work: 0.212 
  • R-Value Observed: 0.216 

Starting Model: experimental
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This is version 1.5 of the entry. See complete history


Literature

Structure of the Escherichia coli ArnA N-formyltransferase domain in complex with N(5) -formyltetrahydrofolate and UDP-Ara4N.

Genthe, N.A.Thoden, J.B.Holden, H.M.

(2016) Protein Sci 25: 1555-1562

  • DOI: https://doi.org/10.1002/pro.2938
  • Primary Citation of Related Structures:  
    5J63

  • PubMed Abstract: 

    ArnA from Escherichia coli is a key enzyme involved in the formation of 4-amino-4-deoxy-l-arabinose. The addition of this sugar to the lipid A moiety of the lipopolysaccharide of pathogenic Gram-negative bacteria allows these organisms to evade the cationic antimicrobial peptides of the host immune system. Indeed, it is thought that such modifications may be responsible for the repeated infections of cystic fibrosis patients with Pseudomonas aeruginosa. ArnA is a bifunctional enzyme with the N- and C-terminal domains catalyzing formylation and oxidative decarboxylation reactions, respectively. The catalytically competent cofactor for the formylation reaction is N(10) -formyltetrahydrofolate. Here we describe the structure of the isolated N-terminal domain of ArnA in complex with its UDP-sugar substrate and N(5) -formyltetrahydrofolate. The model presented herein may prove valuable in the development of new antimicrobial therapeutics.


  • Organizational Affiliation

    Department of Biochemistry, University of Wisconsin, Madison, Wisconsin, 53706.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Bifunctional polymyxin resistance protein ArnA
A, B, C, D
308Escherichia coli H736Mutation(s): 0 
Gene Names: arnAECHG_02161
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
G3N
Query on G3N

Download Ideal Coordinates CCD File 
E [auth A],
G [auth B],
I [auth C],
K [auth D]
(2R,3R,4S,5S)-5-amino-3,4-dihydroxytetrahydro-2H-pyran-2-yl [(2R,3S,4R,5R)-5-(2,4-dioxo-3,4-dihydropyrimidin-1(2H)-yl)-3,4-dihydroxytetrahydrofuran-2-yl]methyl dihydrogen diphosphate
C14 H23 N3 O15 P2
GWBAKYBSWHQNMQ-IAZOVDBXSA-N
FNX
Query on FNX

Download Ideal Coordinates CCD File 
F [auth A],
H [auth B],
J [auth C],
L [auth D]
(4aS,6S)-2-amino-6-{(E)-[(4-methylphenyl)imino]methyl}-4-oxo-4,6,7,8-tetrahydropteridine-5(4aH)-carbaldehyde
C15 H16 N6 O2
UDYJDSNAUDQZNM-RMTXVELISA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.284 
  • R-Value Work: 0.212 
  • R-Value Observed: 0.216 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 75.994α = 89.94
b = 76.206β = 63.78
c = 84.852γ = 61.54
Software Package:
Software NamePurpose
REFMACrefinement
HKL-3000data reduction
HKL-3000data scaling
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesGM115921

Revision History  (Full details and data files)

  • Version 1.0: 2016-05-25
    Type: Initial release
  • Version 1.1: 2016-06-01
    Changes: Database references
  • Version 1.2: 2016-08-10
    Changes: Database references
  • Version 1.3: 2017-09-20
    Changes: Author supporting evidence, Database references, Derived calculations
  • Version 1.4: 2019-12-25
    Changes: Author supporting evidence
  • Version 1.5: 2023-09-27
    Changes: Data collection, Database references, Refinement description