3O83

Structure of BasE N-terminal domain from Acinetobacter baumannii bound to 2-(4-n-dodecyl-1,2,3-triazol-1-yl)-5'-O-[N-(2-hydroxybenzoyl)sulfamoyl]adenosine


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.217 
  • R-Value Work: 0.194 
  • R-Value Observed: 0.195 

wwPDB Validation   3D Report Full Report


Ligand Structure Quality Assessment 


This is version 1.1 of the entry. See complete history


Literature

Biochemical and structural characterization of bisubstrate inhibitors of BasE, the self-standing nonribosomal peptide synthetase adenylate-forming enzyme of acinetobactin synthesis.

Drake, E.J.Duckworth, B.P.Neres, J.Aldrich, C.C.Gulick, A.M.

(2010) Biochemistry 49: 9292-9305

  • DOI: 10.1021/bi101226n
  • Primary Citation of Related Structures:  
    3O84, 3O82, 3O83

  • PubMed Abstract: 
  • The human pathogen Acinetobacter baumannii produces a siderophore called acinetobactin that is derived from one molecule each of threonine, histidine, and 2,3-dihydroxybenzoic acid (DHB). The activity of several nonribosomal peptide synthetase (NRPS) enzymes is used to combine the building blocks into the final molecule ...

    The human pathogen Acinetobacter baumannii produces a siderophore called acinetobactin that is derived from one molecule each of threonine, histidine, and 2,3-dihydroxybenzoic acid (DHB). The activity of several nonribosomal peptide synthetase (NRPS) enzymes is used to combine the building blocks into the final molecule. The acinetobactin synthesis pathway initiates with a self-standing adenylation enzyme, BasE, that activates the DHB molecule and covalently transfers it to the pantetheine cofactor of an aryl-carrier protein of BasF, a strategy that is shared with many siderophore-producing NRPS clusters. In this reaction, DHB reacts with ATP to form the aryl adenylate and pyrophosphate. In a second partial reaction, the DHB is transferred to the carrier protein. Inhibitors of BasE and related enzymes have been identified that prevent growth of bacteria on iron-limiting media. Recently, a new inhibitor of BasE has been identified via high-throughput screening using a fluorescence polarization displacement assay. We present here biochemical and structural studies to examine the binding mode of this inhibitor. The kinetics of the wild-type BasE enzyme is shown, and inhibition studies demonstrate that the new compound exhibits competitive inhibition against both ATP and 2,3-dihydroxybenzoate. Structural examination of BasE bound to this inhibitor illustrates a novel binding mode in which the phenyl moiety partially fills the enzyme pantetheine binding tunnel. Structures of rationally designed bisubstrate inhibitors are also presented.


    Organizational Affiliation

    Hauptman-Woodward Institute and Department of Structural Biology, University at Buffalo, Buffalo, NY 14203-1102, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Peptide arylation enzymeA, B544Acinetobacter baumannii AB900Mutation(s): 1 
Gene Names: ACICU_02578basE
EC: 6.2.1
UniProt
Find proteins for A0A7U3Y1M5 (Acinetobacter baumannii (strain ACICU))
Explore A0A7U3Y1M5 
Go to UniProtKB:  A0A7U3Y1M5
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
IXN (Subject of Investigation/LOI)
Query on IXN

Download Ideal Coordinates CCD File 
C [auth A], H [auth B]2-(4-dodecyl-1H-1,2,3-triazol-1-yl)-5'-O-{[(2-hydroxyphenyl)carbonyl]sulfamoyl}adenosine
C31 H43 N9 O8 S
IZIYHQKZTVZLLO-NYBSAPDNSA-N
 Ligand Interaction
MRD
Query on MRD

Download Ideal Coordinates CCD File 
L [auth B](4R)-2-METHYLPENTANE-2,4-DIOL
C6 H14 O2
SVTBMSDMJJWYQN-RXMQYKEDSA-N
 Ligand Interaction
MPD
Query on MPD

Download Ideal Coordinates CCD File 
G [auth A](4S)-2-METHYL-2,4-PENTANEDIOL
C6 H14 O2
SVTBMSDMJJWYQN-YFKPBYRVSA-N
 Ligand Interaction
CA
Query on CA

Download Ideal Coordinates CCD File 
D [auth A], E [auth A], F [auth A], I [auth B], J [auth B], K [auth B]CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.217 
  • R-Value Work: 0.194 
  • R-Value Observed: 0.195 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 66.46α = 90
b = 144.238β = 90
c = 148.469γ = 90
Software Package:
Software NamePurpose
Blu-Icedata collection
MOLREPphasing
REFMACrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

View Full Validation Report



Ligand Structure Quality Assessment  



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-10-06
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance