ISDA

Entry Detail

PDB ID:

7Z6C

Keywords:

Title:

Crystal structure of human Dihydroorotate Dehydrogenase in complex with the inhibitor 2-Hydroxy-N-(2-ispropyl-5-methyl-4-phenoxyphenyl)pyrazolo[1,5-a]pyridine-3-carboxamide.

Biological Source:

Source Organism:

Homo sapiens

Host Organism:

Escherichia coli BL21(DE3)

PDB Version:

Deposition Date:

2022-03-11

Release Date:

2022-10-12

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

1.85 Å

R-Value Free:

0.19

R-Value Work:

0.17

R-Value Observed:

0.17

Space Group:

P 32 2 1

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Macromolecular Entities

Protein Blast

Polymer Type:polypeptide(L)
Description:Dihydroorotate dehydrogenase (quinone), mitochondrial
Chain IDs:A
Chain Length:366
Number of Molecules:1
Biological Source:Homo sapiens

UniProt ID:Q02127 Pfam ID:PF01180 EC:1.3.5.2

Ligand Molecules

ACT

FMN

IEQ

ORO

P6G

Primary Citation

Targeting Acute Myelogenous Leukemia Using Potent Human Dihydroorotate Dehydrogenase Inhibitors Based on the 2-Hydroxypyrazolo[1,5- a ]pyridine Scaffold: SAR of the Aryloxyaryl Moiety.

Sainas, S, Giorgis, M, Circosta, P, Poli, G, Alberti, M, Passoni, A, Gaidano, V, Pippione, A.C, Vitale, N, Bonanni, D, Rolando, B, Cignetti, A, Ramondetti, C, Lanno, A, Ferraris, D.M, Canepa, B, Buccinna, B, Piccinini, M, Rizzi, M, Saglio, G, Al-Karadaghi, S, Boschi, D, Miggiano, R, Tuccinardi, T, Lolli, M.L.Show

J.Med.Chem. 65 12701 12724 (2022)

PMID: 36162075 DOI: 10.1021/acs.jmedchem.2c00496

Abstact

In recent years, human dihydroorotate dehydrogenase inhibitors have been associated with acute myelogenous leukemia as well as studied as potent host targeting antivirals. Starting from MEDS433 (IC50 1.2 nM), we kept improving the structure-activity relationship of this class of compounds characterized by 2-hydroxypyrazolo[1,5-a]pyridine scaffold. Using an in silico/crystallography supported design, we identified compound 4 (IC50 7.2 nM), characterized by the presence of a decorated aryloxyaryl moiety that replaced the biphenyl scaffold, with potent inhibition and pro-differentiating abilities on AML THP1 cells (EC50 74 nM), superior to those of brequinar (EC50 249 nM) and boosted when in combination with dipyridamole. Finally, compound 4 has an extremely low cytotoxicity on non-AML cells as well as MEDS433; it has shown a significant antileukemic activity in vivo in a xenograft mouse model of AML.

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Primary Citation of related structures