6Z4N

CRYSTAL STRUCTURE OF OASS COMPLEXED WITH UPAR INHIBITOR


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.20 Å
  • R-Value Free: 0.179 
  • R-Value Work: 0.154 

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Literature

Investigational Studies on a Hit Compound Cyclopropane-Carboxylic Acid Derivative Targeting O -Acetylserine Sulfhydrylase as a Colistin Adjuvant.

Annunziato, G.Spadini, C.Franko, N.Storici, P.Demitri, N.Pieroni, M.Flisi, S.Rosati, L.Iannarelli, M.Marchetti, M.Magalhaes, J.Bettati, S.Mozzarelli, A.Cabassi, C.S.Campanini, B.Costantino, G.

(2021) ACS Infect Dis 7: 281-292

  • DOI: 10.1021/acsinfecdis.0c00378
  • Primary Citation of Related Structures:  
    6Z4N

  • PubMed Abstract: 
  • Antibacterial adjuvants are of great significance, since they allow the therapeutic dose of conventional antibiotics to be lowered and reduce the insurgence of antibiotic resistance. Herein, we report that an O- acetylserine sulfhydrylase (OASS) inhibitor can be used as a colistin adjuvant to treat infections caused by Gram-positive and Gram-negative pathogens ...

    Antibacterial adjuvants are of great significance, since they allow the therapeutic dose of conventional antibiotics to be lowered and reduce the insurgence of antibiotic resistance. Herein, we report that an O- acetylserine sulfhydrylase (OASS) inhibitor can be used as a colistin adjuvant to treat infections caused by Gram-positive and Gram-negative pathogens. A compound that binds OASS with a nM dissociation constant was tested as an adjuvant of colistin against six critical pathogens responsible for infections spreading worldwide, Escherichia coli , Salmonella enterica serovar Typhimurium, Klebisiella pneumoniae , Staphylococcus aureus , methicillin-resistant Staphylococcus aureus , and Staphylococcus pseudintermedius . The compound showed promising synergistic or additive activities against all of them. Knockout experiments confirmed the intracellular target engagement supporting the proposed mechanism of action. Moreover, compound toxicity was evaluated by means of its hemolytic activity against sheep defibrinated blood cells, showing a good safety profile. The 3D structure of the compound in complex with OASS was determined at 1.2 Å resolution by macromolecular crystallography, providing for the first time structural insights about the nature of the interaction between the enzyme and this class of competitive inhibitors. Our results provide a robust proof of principle supporting OASS as a potential nonessential antibacterial target to develop a new class of adjuvants and the structural basis for further structure-activity relationship studies.


    Organizational Affiliation

    P4T Group, Department of Food and Drugs, University of Parma, Parco Area delle Scienze 27/A, 43124 Parma, Italy.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Cysteine synthase A AAABBB324Salmonella enterica subsp. enterica serovar Typhimurium str. LT2Mutation(s): 0 
Gene Names: cysKSTM2430
EC: 2.5.1.47
Find proteins for P0A1E3 (Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720))
Explore P0A1E3 
Go to UniProtKB:  P0A1E3
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 5 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
Q7B
Query on Q7B

Download Ideal Coordinates CCD File 
AAA, BBB
(1~{S},2~{S})-1-[(4-methylphenyl)methyl]-2-phenyl-cyclopropane-1-carboxylic acid
C18 H18 O2
AKNVQFLVLPRHIR-FUHWJXTLSA-N
 Ligand Interaction
PLP
Query on PLP

Download Ideal Coordinates CCD File 
AAA, BBB
PYRIDOXAL-5'-PHOSPHATE
C8 H10 N O6 P
NGVDGCNFYWLIFO-UHFFFAOYSA-N
 Ligand Interaction
GOL
Query on GOL

Download Ideal Coordinates CCD File 
AAA, BBB
GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
DMS
Query on DMS

Download Ideal Coordinates CCD File 
AAA, BBB
DIMETHYL SULFOXIDE
C2 H6 O S
IAZDPXIOMUYVGZ-UHFFFAOYSA-N
 Ligand Interaction
CO
Query on CO

Download Ideal Coordinates CCD File 
AAA
COBALT (II) ION
Co
XLJKHNWPARRRJB-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.20 Å
  • R-Value Free: 0.179 
  • R-Value Work: 0.154 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 53.261α = 90
b = 96.275β = 90
c = 140.835γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
Aimlessdata scaling
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2021-04-07
    Type: Initial release