2X3J

CO-COMPLEX STRUCTURE OF ACHROMOBACTIN SYNTHETASE PROTEIN D (ACSD) WITH ATP AND N-CITRYL-ETHYLENEDIAMINE FROM PECTOBACTERIUM CHRYSANTHEMI


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.231 
  • R-Value Work: 0.190 

wwPDB Validation 3D Report Full Report


This is version 1.5 of the entry. See complete history

Literature

Structural Basis for Acyl Acceptor Specificity in the Achromobactin Biosynthetic Enzyme Acsd.

Schmelz, S.Botting, C.H.Song, L.Kadi, N.F.Challis, G.L.Naismith, J.H.

(2011) J.Mol.Biol. 412: 495

  • DOI: 10.1016/j.jmb.2011.07.059

  • PubMed Abstract: 
  • Siderophores are known virulence factors, and their biosynthesis is a target for new antibacterial agents. A non-ribosomal peptide synthetase-independent siderophore biosynthetic pathway in Dickeya dadantii is responsible for production of the sidero ...

    Siderophores are known virulence factors, and their biosynthesis is a target for new antibacterial agents. A non-ribosomal peptide synthetase-independent siderophore biosynthetic pathway in Dickeya dadantii is responsible for production of the siderophore achromobactin. The D. dadantii achromobactin biosynthesis protein D (AcsD) enzyme has been shown to enantioselectively esterify citric acid with l-serine in the first committed step of achromobactin biosynthesis. The reaction occurs in two steps: stereospecific activation of citric acid by adenylation, followed by attack of the enzyme-bound citryl adenylate by l-serine to produce the homochiral ester. We now report a detailed characterization of the substrate profile and mechanism of the second (acyl transfer) step of AcsD enzyme. We demonstrate that the enzyme catalyzes formation of not only esters but also amides from the citryl-adenylate intermediate. We have rationalized the substrate utilization profile for the acylation reaction by determining the first X-ray crystal structure of a product complex for this enzyme class. We have identified the residues that are important for both recognition of l-serine and catalysis of ester formation. Our hypotheses were tested by biochemical analysis of various mutants, one of which shows a reversal of specificity from the wild type with respect to non-natural substrates. This change can be rationalized on the basis of our structural data. That this change in specificity is accompanied by no loss in activity suggests that AcsD and other members of the non-ribosomal peptide synthetase-independent siderophore superfamily may have biotransformation potential.


    Organizational Affiliation

    Scottish Structural Proteomics Facility and Centre for Biomolecular Sciences, The University of St Andrews, Scotland KY16 9ST, UK.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ACSD
A, B
620Dickeya chrysanthemiMutation(s): 0 
Gene Names: acsD
Find proteins for Q93AT8 (Dickeya chrysanthemi)
Go to UniProtKB:  Q93AT8
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ATP
Query on ATP

Download SDF File 
Download CCD File 
A, B
ADENOSINE-5'-TRIPHOSPHATE
C10 H16 N5 O13 P3
ZKHQWZAMYRWXGA-KQYNXXCUSA-N
 Ligand Interaction
GOL
Query on GOL

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Download CCD File 
A, B
GLYCEROL
GLYCERIN; PROPANE-1,2,3-TRIOL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
X3J
Query on X3J

Download SDF File 
Download CCD File 
B
(2S)-2-{2-[(2-AMINOETHYL)AMINO]-2-OXOETHYL}-2-HYDROXYBUTANEDIOIC ACID
5,6-DIHYDRO-BENZO[H]CINNOLIN-3-YLAMINE
C8 H14 N2 O6
KQWWDTIPDRWKGZ-QMMMGPOBSA-N
 Ligand Interaction
MG
Query on MG

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Download CCD File 
A, B
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.231 
  • R-Value Work: 0.190 
  • Space Group: P 1
Unit Cell:
Length (Å)Angle (°)
a = 57.704α = 97.26
b = 71.521β = 101.97
c = 95.595γ = 91.01
Software Package:
Software NamePurpose
REFMACrefinement
HKL-2000data reduction
PHENIXphasing
HKL-2000data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2011-01-19
    Type: Initial release
  • Version 1.1: 2011-08-10
    Type: Database references, Other, Version format compliance
  • Version 1.2: 2011-09-14
    Type: Database references
  • Version 1.3: 2017-07-12
    Type: Refinement description
  • Version 1.4: 2019-05-08
    Type: Data collection, Experimental preparation
  • Version 1.5: 2019-05-15
    Type: Data collection, Experimental preparation