5F1U

biomimetic design results in a potent allosteric inhibitor of dihydrodipicolinate synthase from Campylobacter jejuni


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.35 Å
  • R-Value Free: 0.229 
  • R-Value Work: 0.171 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Biomimetic Design Results in a Potent Allosteric Inhibitor of Dihydrodipicolinate Synthase from Campylobacter jejuni.

Skovpen, Y.V.Conly, C.J.Sanders, D.A.Palmer, D.R.

(2016) J.Am.Chem.Soc. 138: 2014-2020

  • DOI: 10.1021/jacs.5b12695
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Dihydrodipicolinate synthase (DHDPS), an enzyme required for bacterial peptidoglycan biosynthesis, catalyzes the condensation of pyruvate and β-aspartate semialdehyde (ASA) to form a cyclic product which dehydrates to form dihydrodipicolinate. DHDPS ...

    Dihydrodipicolinate synthase (DHDPS), an enzyme required for bacterial peptidoglycan biosynthesis, catalyzes the condensation of pyruvate and β-aspartate semialdehyde (ASA) to form a cyclic product which dehydrates to form dihydrodipicolinate. DHDPS has, for several years, been considered a putative target for novel antibiotics. We have designed the first potent inhibitor of this enzyme by mimicking its natural allosteric regulation by lysine, and obtained a crystal structure of the protein-inhibitor complex at 2.2 Å resolution. This novel inhibitor, which we named "bislysine", resembles two lysine molecules linked by an ethylene bridge between the α-carbon atoms. Bislysine is a mixed partial inhibitor with respect to the first substrate, pyruvate, and a noncompetitive partial inhibitor with respect to ASA, and binds to all forms of the enzyme with a Ki near 200 nM, more than 300 times more tightly than lysine. Hill plots show that the inhibition is cooperative, indicating that the allosteric sites are not independent despite being located on opposite sides of the protein tetramer, separated by approximately 50 Å. A mutant enzyme resistant to lysine inhibition, Y110F, is strongly inhibited by this novel inhibitor, suggesting this may be a promising strategy for antibiotic development.


    Organizational Affiliation

    Department of Chemistry, University of Saskatchewan , 110 Science Place, Saskatoon, Saskatchewan, Canada S7N 5C9.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
4-hydroxy-tetrahydrodipicolinate synthase
A, B, C, D
297Campylobacter jejuni subsp. jejuni serotype O:2 (strain ATCC 700819 / NCTC 11168)Mutation(s): 1 
Gene Names: dapA
EC: 4.3.3.7
Find proteins for Q9PPB4 (Campylobacter jejuni subsp. jejuni serotype O:2 (strain ATCC 700819 / NCTC 11168))
Go to UniProtKB:  Q9PPB4
Small Molecules
Ligands 5 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
3VN
Query on 3VN

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Download CCD File 
A, D
(2R,5R)-2,5-diamino-2,5-bis(4-aminobutyl)hexanedioic acid
bis-Lysine
C14 H30 N4 O4
XYUHPPVEDOOPDE-ZIAGYGMSSA-N
 Ligand Interaction
CL
Query on CL

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Download CCD File 
B
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
EDO
Query on EDO

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Download CCD File 
A, B, C, D
1,2-ETHANEDIOL
ETHYLENE GLYCOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
 Ligand Interaction
PG4
Query on PG4

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Download CCD File 
A
TETRAETHYLENE GLYCOL
C8 H18 O5
UWHCKJMYHZGTIT-UHFFFAOYSA-N
 Ligand Interaction
PGE
Query on PGE

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Download CCD File 
B
TRIETHYLENE GLYCOL
C6 H14 O4
ZIBGPFATKBEMQZ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.35 Å
  • R-Value Free: 0.229 
  • R-Value Work: 0.171 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 79.590α = 90.00
b = 96.780β = 90.00
c = 145.980γ = 90.00
Software Package:
Software NamePurpose
PDB_EXTRACTdata extraction
XSCALEdata scaling
XDSdata reduction
PHENIXrefinement
MOLREPphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2016-02-17
    Type: Initial release
  • Version 1.1: 2016-02-24
    Type: Database references
  • Version 1.2: 2017-09-27
    Type: Author supporting evidence, Derived calculations