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

Experimental Data Snapshot

  • Resolution: 2.20 Å
  • R-Value Free: 0.203 
  • R-Value Work: 0.157 
  • R-Value Observed: 0.159 

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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: https://doi.org/10.1021/jacs.5b12695
  • Primary Citation of Related Structures:  
    5F1U, 5F1V

  • 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 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.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
4-hydroxy-tetrahydrodipicolinate synthase
A, B, C, D
297Campylobacter jejuniMutation(s): 0 
Gene Names: dapA
Find proteins for Q9PPB4 (Campylobacter jejuni subsp. jejuni serotype O:2 (strain ATCC 700819 / NCTC 11168))
Explore Q9PPB4 
Go to UniProtKB:  Q9PPB4
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9PPB4
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on 3VN

Download Ideal Coordinates CCD File 
E [auth A],
H [auth A],
M [auth B],
U [auth D]
(2R,5R)-2,5-diamino-2,5-bis(4-aminobutyl)hexanedioic acid
C14 H30 N4 O4
Query on PGE

Download Ideal Coordinates CCD File 
F [auth A],
I [auth B],
Q [auth D]
C6 H14 O4
Query on GOL

Download Ideal Coordinates CCD File 
C3 H8 O3
Query on EDO

Download Ideal Coordinates CCD File 
G [auth A]
J [auth B]
K [auth B]
L [auth B]
N [auth C]
G [auth A],
J [auth B],
K [auth B],
L [auth B],
N [auth C],
O [auth C],
R [auth D],
S [auth D],
T [auth D]
C2 H6 O2
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on KPI
A, B, C, D
Binding Affinity Annotations 
IDSourceBinding Affinity
3VN Binding MOAD:  5F1V Ki: 200 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Resolution: 2.20 Å
  • R-Value Free: 0.203 
  • R-Value Work: 0.157 
  • R-Value Observed: 0.159 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 81.27α = 90
b = 96.95β = 90
c = 146.97γ = 90
Software Package:
Software NamePurpose
XSCALEdata scaling
PDB_EXTRACTdata extraction
XDSdata reduction

Structure Validation

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Ligand Structure Quality Assessment 

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Natural Sciences and Engineering Research Council (NSERC, Canada)Canada--

Revision History  (Full details and data files)

  • Version 1.0: 2016-02-17
    Type: Initial release
  • Version 1.1: 2016-02-24
    Changes: Database references
  • Version 2.0: 2017-09-27
    Changes: Atomic model, Author supporting evidence, Derived calculations, Structure summary
  • Version 3.0: 2018-05-30
    Changes: Atomic model, Data collection, Derived calculations, Non-polymer description, Polymer sequence, Structure summary
  • Version 3.1: 2020-01-08
    Changes: Author supporting evidence
  • Version 3.2: 2023-09-27
    Changes: Data collection, Database references, Refinement description
  • Version 3.3: 2023-11-29
    Changes: Data collection