2O3Z

X-ray crystal structure of LpxC complexed with 3-heptyloxybenzoate


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.25 Å
  • R-Value Free: 0.227 
  • R-Value Work: 0.197 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Amphipathic benzoic acid derivatives: synthesis and binding in the hydrophobic tunnel of the zinc deacetylase LpxC.

Shin, H.Gennadios, H.A.Whittington, D.A.Christianson, D.W.

(2007) Bioorg.Med.Chem. 15: 2617-2623

  • DOI: 10.1016/j.bmc.2007.01.044

  • PubMed Abstract: 
  • The first committed step in lipid A biosynthesis is catalyzed by uridine diphosphate-(3-O-(R-3-hydroxymyristoyl))-N-acetylglucosamine deacetylase (LpxC), a zinc-dependent deacetylase, and inhibitors of LpxC may be useful in the development of antibac ...

    The first committed step in lipid A biosynthesis is catalyzed by uridine diphosphate-(3-O-(R-3-hydroxymyristoyl))-N-acetylglucosamine deacetylase (LpxC), a zinc-dependent deacetylase, and inhibitors of LpxC may be useful in the development of antibacterial agents targeting a broad spectrum of Gram-negative bacteria. Here, we report the design of amphipathic benzoic acid derivatives that bind in the hydrophobic tunnel in the active site of LpxC. The hydrophobic tunnel accounts for the specificity of LpxC toward substrates and substrate analogues bearing a 3-O-myristoyl substituent. Simple benzoic acid derivatives bearing an aliphatic 'tail' bind in the hydrophobic tunnel with micromolar affinity despite the lack of a glucosamine ring like that of the substrate. However, although these benzoic acid derivatives each contain a negatively charged carboxylate 'warhead' intended to coordinate to the active site zinc ion, the 2.25A resolution X-ray crystal structure of LpxC complexed with 3-(heptyloxy)benzoate reveals 'backward' binding in the hydrophobic tunnel, such that the benzoate moiety does not coordinate to zinc. Instead, it binds at the outer end of the hydrophobic tunnel. Interestingly, these ligands bind with affinities comparable to those measured for more complicated substrate analogue inhibitors containing glucosamine ring analogues and hydroxamate 'warheads' that coordinate to the active site zinc ion. We conclude that the intermolecular interactions in the hydrophobic tunnel dominate enzyme affinity in this series of benzoic acid derivatives.


    Organizational Affiliation

    Department of Chemistry, University of San Francisco, 2130 Fulton Street, San Francisco, CA 94117-1080, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
UDP-3-O-[3-hydroxymyristoyl] N-acetylglucosamine deacetylase
A, B
271Aquifex aeolicus (strain VF5)Mutation(s): 1 
Gene Names: lpxC (envA)
EC: 3.5.1.108
Find proteins for O67648 (Aquifex aeolicus (strain VF5))
Go to UniProtKB:  O67648
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
AI7
Query on AI7

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A, B
3-(heptyloxy)benzoic acid
3-heptyloxybenzoate
C14 H20 O3
FOFZVIUYGPBWLV-UHFFFAOYSA-N
 Ligand Interaction
ZN
Query on ZN

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A, B
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
SO4
Query on SO4

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A, B
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
CL
Query on CL

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Download CCD File 
A
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
AI7Kd: 2000 nM BINDINGMOAD
AI7Kd: 2000 nM PDBBIND
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.25 Å
  • R-Value Free: 0.227 
  • R-Value Work: 0.197 
  • Space Group: P 61
Unit Cell:
Length (Å)Angle (°)
a = 101.006α = 90.00
b = 101.006β = 90.00
c = 122.674γ = 120.00
Software Package:
Software NamePurpose
HKL-2000data scaling
HKL-2000data reduction
ADSCdata collection
AMoREphasing
CNSrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2007-02-27
    Type: Initial release
  • Version 1.1: 2008-05-01
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Derived calculations, Version format compliance