3DX5

Crystal structure of the probable 3-DHS dehydratase AsbF involved in the petrobactin synthesis from Bacillus anthracis


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.12 Å
  • R-Value Free: 0.178 
  • R-Value Work: 0.148 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structural and functional analysis of AsbF: origin of the stealth 3,4-dihydroxybenzoic acid subunit for petrobactin biosynthesis.

Pfleger, B.F.Kim, Y.Nusca, T.D.Maltseva, N.Lee, J.Y.Rath, C.M.Scaglione, J.B.Janes, B.K.Anderson, E.C.Bergman, N.H.Hanna, P.C.Joachimiak, A.Sherman, D.H.

(2008) Proc.Natl.Acad.Sci.USA 105: 17133-17138

  • DOI: 10.1073/pnas.0808118105

  • PubMed Abstract: 
  • Petrobactin, a virulence-associated siderophore produced by Bacillus anthracis, chelates ferric iron through the rare 3,4-isomer of dihydroxybenzoic acid (3,4-DHBA). Most catechol siderophores, including bacillibactin and enterobactin, use 2,3-DHBA a ...

    Petrobactin, a virulence-associated siderophore produced by Bacillus anthracis, chelates ferric iron through the rare 3,4-isomer of dihydroxybenzoic acid (3,4-DHBA). Most catechol siderophores, including bacillibactin and enterobactin, use 2,3-DHBA as a biosynthetic subunit. Significantly, siderocalin, a factor involved in human innate immunity, sequesters ferric siderophores bearing the more typical 2,3-DHBA moiety, thereby impeding uptake of iron by the pathogenic bacterial cell. In contrast, the unusual 3,4-DHBA component of petrobactin renders the siderocalin system incapable of obstructing bacterial iron uptake. Although recent genetic and biochemical studies have revealed selected early steps in petrobactin biosynthesis, the origin of 3,4-DHBA as well as the function of the protein encoded by the final gene in the B. anthracis siderophore biosynthetic (asb) operon, asbF (BA1986), has remained unclear. In this study we demonstrate that 3,4-DHBA is produced through conversion of the common bacterial metabolite 3-dehydroshikimate (3-DHS) by AsbF-a 3-DHS dehydratase. Elucidation of the cocrystal structure of AsbF with 3,4-DHBA, in conjunction with a series of biochemical studies, supports a mechanism in which an enolate intermediate is formed through the action of this 3-DHS dehydratase metalloenzyme. Structural and functional parallels are evident between AsbF and other enzymes within the xylose isomerase TIM-barrel family. Overall, these data indicate that microbial species shown to possess homologs of AsbF may, like B. anthracis, also rely on production of the unique 3,4-DHBA metabolite to achieve full viability in the environment or virulence within the host.


    Organizational Affiliation

    Life Sciences Institute and Departments of Medicinal Chemistry and Chemistry, University of Michigan, 210 Washtenaw Avenue, Ann Arbor, MI 48109, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
uncharacterized protein AsbF
A
286Bacillus anthracisMutation(s): 0 
Gene Names: asbF
EC: 4.2.1.118
Find proteins for Q81RQ4 (Bacillus anthracis)
Go to UniProtKB:  Q81RQ4
Small Molecules
Ligands 5 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MN
Query on MN

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Download CCD File 
A
MANGANESE (II) ION
Mn
WAEMQWOKJMHJLA-UHFFFAOYSA-N
 Ligand Interaction
CL
Query on CL

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Download CCD File 
A
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
GOL
Query on GOL

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Download CCD File 
A
GLYCEROL
GLYCERIN; PROPANE-1,2,3-TRIOL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
DHB
Query on DHB

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Download CCD File 
A
3,4-DIHYDROXYBENZOIC ACID
C7 H6 O4
YQUVCSBJEUQKSH-UHFFFAOYSA-N
 Ligand Interaction
TRS
Query on TRS

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Download CCD File 
A
2-AMINO-2-HYDROXYMETHYL-PROPANE-1,3-DIOL
TRIS BUFFER
C4 H12 N O3
LENZDBCJOHFCAS-UHFFFAOYSA-O
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A
L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.12 Å
  • R-Value Free: 0.178 
  • R-Value Work: 0.148 
  • Space Group: P 65 2 2
Unit Cell:
Length (Å)Angle (°)
a = 134.483α = 90.00
b = 134.483β = 90.00
c = 72.806γ = 120.00
Software Package:
Software NamePurpose
HKL-3000phasing
DMphasing
HKL-3000data reduction
REFMACrefinement
Cootmodel building
SHELXDphasing
MLPHAREphasing
HKL-3000data collection
SBC-Collectdata collection
HKL-3000data scaling
RESOLVEphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2008-09-02
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Advisory, Version format compliance