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Identification, design and biological evaluation of heterocyclic quinolones targeting Plasmodium falciparum type II NADH:quinone oxidoreductase (PfNDH2).

Leung SC, Gibbons P, Amewu R, Nixon GL, Pidathala C, Hong WD, Pacorel B, Berry NG, Sharma R, Stocks PA, Srivastava A, Shone AE, Charoensutthivarakul S, Taylor L, Berger O, Mbekeani A, Hill A, Fisher NE, Warman AJ, Biagini GA, Ward SA, O'Neill PM - J. Med. Chem. (2012)

Bottom Line: In order to reduce ClogP and improve solubility of CK-2-68 incorporation of a variety of heterocycles, within the side chain of the quinolone core, was carried out, and this approach led to a lead compound SL-2-25 (8b). 8b has IC(50)s in the nanomolar range versus both the enzyme and whole cell P. falciparum (IC(50) = 15 nM PfNDH2; IC(50) = 54 nM (3D7 strain of P. falciparum) with notable oral activity of ED(50)/ED(90) of 1.87/4.72 mg/kg versus Plasmodium berghei (NS Strain) in a murine model of malaria when formulated as a phosphate salt.Analogues in this series also demonstrate nanomolar activity against the bc(1) complex of P. falciparum providing the potential added benefit of a dual mechanism of action.The potent oral activity of 2-pyridyl quinolones underlines the potential of this template for further lead optimization studies.

View Article: PubMed Central - PubMed

Affiliation: Department of Chemistry, University of Liverpool, Liverpool, L69 7ZD, UK.

ABSTRACT
Following a program undertaken to identify hit compounds against NADH:ubiquinone oxidoreductase (PfNDH2), a novel enzyme target within the malaria parasite Plasmodium falciparum, hit to lead optimization led to identification of CK-2-68, a molecule suitable for further development. In order to reduce ClogP and improve solubility of CK-2-68 incorporation of a variety of heterocycles, within the side chain of the quinolone core, was carried out, and this approach led to a lead compound SL-2-25 (8b). 8b has IC(50)s in the nanomolar range versus both the enzyme and whole cell P. falciparum (IC(50) = 15 nM PfNDH2; IC(50) = 54 nM (3D7 strain of P. falciparum) with notable oral activity of ED(50)/ED(90) of 1.87/4.72 mg/kg versus Plasmodium berghei (NS Strain) in a murine model of malaria when formulated as a phosphate salt. Analogues in this series also demonstrate nanomolar activity against the bc(1) complex of P. falciparum providing the potential added benefit of a dual mechanism of action. The potent oral activity of 2-pyridyl quinolones underlines the potential of this template for further lead optimization studies.

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X-ray crystal structure of quinolone 40c.
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fig3: X-ray crystal structure of quinolone 40c.

Mentions: Crystals of quinolones 40a (see Figure 2, CCDC 833299) and 40c (see Figure 3, CCDC 833897) were grown and their structures confirmedbyX-ray crystallography.


Identification, design and biological evaluation of heterocyclic quinolones targeting Plasmodium falciparum type II NADH:quinone oxidoreductase (PfNDH2).

Leung SC, Gibbons P, Amewu R, Nixon GL, Pidathala C, Hong WD, Pacorel B, Berry NG, Sharma R, Stocks PA, Srivastava A, Shone AE, Charoensutthivarakul S, Taylor L, Berger O, Mbekeani A, Hill A, Fisher NE, Warman AJ, Biagini GA, Ward SA, O'Neill PM - J. Med. Chem. (2012)

X-ray crystal structure of quinolone 40c.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3351724&req=5

fig3: X-ray crystal structure of quinolone 40c.
Mentions: Crystals of quinolones 40a (see Figure 2, CCDC 833299) and 40c (see Figure 3, CCDC 833897) were grown and their structures confirmedbyX-ray crystallography.

Bottom Line: In order to reduce ClogP and improve solubility of CK-2-68 incorporation of a variety of heterocycles, within the side chain of the quinolone core, was carried out, and this approach led to a lead compound SL-2-25 (8b). 8b has IC(50)s in the nanomolar range versus both the enzyme and whole cell P. falciparum (IC(50) = 15 nM PfNDH2; IC(50) = 54 nM (3D7 strain of P. falciparum) with notable oral activity of ED(50)/ED(90) of 1.87/4.72 mg/kg versus Plasmodium berghei (NS Strain) in a murine model of malaria when formulated as a phosphate salt.Analogues in this series also demonstrate nanomolar activity against the bc(1) complex of P. falciparum providing the potential added benefit of a dual mechanism of action.The potent oral activity of 2-pyridyl quinolones underlines the potential of this template for further lead optimization studies.

View Article: PubMed Central - PubMed

Affiliation: Department of Chemistry, University of Liverpool, Liverpool, L69 7ZD, UK.

ABSTRACT
Following a program undertaken to identify hit compounds against NADH:ubiquinone oxidoreductase (PfNDH2), a novel enzyme target within the malaria parasite Plasmodium falciparum, hit to lead optimization led to identification of CK-2-68, a molecule suitable for further development. In order to reduce ClogP and improve solubility of CK-2-68 incorporation of a variety of heterocycles, within the side chain of the quinolone core, was carried out, and this approach led to a lead compound SL-2-25 (8b). 8b has IC(50)s in the nanomolar range versus both the enzyme and whole cell P. falciparum (IC(50) = 15 nM PfNDH2; IC(50) = 54 nM (3D7 strain of P. falciparum) with notable oral activity of ED(50)/ED(90) of 1.87/4.72 mg/kg versus Plasmodium berghei (NS Strain) in a murine model of malaria when formulated as a phosphate salt. Analogues in this series also demonstrate nanomolar activity against the bc(1) complex of P. falciparum providing the potential added benefit of a dual mechanism of action. The potent oral activity of 2-pyridyl quinolones underlines the potential of this template for further lead optimization studies.

Show MeSH
Related in: MedlinePlus