6VND image
Entry Detail
PDB ID:
6VND
Title:
Quaternary Complex of human dihydroorotate dehydrogenase (DHODH) with flavin mononucleotide (FMN), orotic acid and AG-636
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2020-01-29
Release Date:
2020-11-04
Method Details:
Experimental Method:
Resolution:
1.97 Å
R-Value Free:
0.19
R-Value Work:
0.15
R-Value Observed:
0.15
Space Group:
P 32 2 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Dihydroorotate dehydrogenase (quinone), mitochondrial
Chain IDs:A
Chain Length:368
Number of Molecules:1
Biological Source:Homo sapiens
Primary Citation
Selective Vulnerability to Pyrimidine Starvation in Hematologic Malignancies Revealed by AG-636, a Novel Clinical-Stage Inhibitor of Dihydroorotate Dehydrogenase.
Mol.Cancer Ther. 19 2502 2515 (2020)
PMID: 33082276 DOI: 10.1158/1535-7163.MCT-20-0550

Abstact

Agents targeting metabolic pathways form the backbone of standard oncology treatments, though a better understanding of differential metabolic dependencies could instruct more rationale-based therapeutic approaches. We performed a chemical biology screen that revealed a strong enrichment in sensitivity to a novel dihydroorotate dehydrogenase (DHODH) inhibitor, AG-636, in cancer cell lines of hematologic versus solid tumor origin. Differential AG-636 activity translated to the in vivo setting, with complete tumor regression observed in a lymphoma model. Dissection of the relationship between uridine availability and response to AG-636 revealed a divergent ability of lymphoma and solid tumor cell lines to survive and grow in the setting of depleted extracellular uridine and DHODH inhibition. Metabolic characterization paired with unbiased functional genomic and proteomic screens pointed to adaptive mechanisms to cope with nucleotide stress as contributing to response to AG-636. These findings support targeting of DHODH in lymphoma and other hematologic malignancies and suggest combination strategies aimed at interfering with DNA-damage response pathways.

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