5ZF7

Structure of human dihydroorotate dehydrogenase in complex with 277-9-OH

Summary for 5ZF7

• Entry DOI: 10.2210/pdb5zf7/pdb
• Descriptor: Dihydroorotate dehydrogenase (quinone), mitochondrial, FLAVIN MONONUCLEOTIDE, OROTIC ACID, ... (7 entities in total)
• Functional Keywords: rossmann fold, dihydroorotate/orotate, ubiquinone/ubiquinol, mitochondrial inner membrane, inhibitor complex, oxidoreductase
• Biological source: Homo sapiens (Human)
• Total number of polymer chains: 1
• Total formula weight: 44007.98

Authors

Miyazaki, Y.,Inaoka, K.D.,Shiba, T.,Saimoto, H.,Amalia, E.,Kido, Y.,Sakai, C.,Nakamura, M.,Moore, L.A.,Harada, S.,Kita, K. (deposition date: 2018-03-02, release date: 2018-09-26, Last modification date: 2023-11-22)

Primary citation

Miyazaki, Y.,Inaoka, D.K.,Shiba, T.,Saimoto, H.,Sakura, T.,Amalia, E.,Kido, Y.,Sakai, C.,Nakamura, M.,Moore, A.L.,Harada, S.,Kita, K.
Selective Cytotoxicity of Dihydroorotate Dehydrogenase Inhibitors to Human Cancer Cells Under Hypoxia and Nutrient-Deprived Conditions.
Front Pharmacol, 9:997-997, 2018

PubMed Abstract: Human dihydroorotate dehydrogenase (HsDHODH) is a key enzyme of pyrimidine biosynthesis pathway. It is located on the mitochondrial inner membrane and contributes to the respiratory chain by shuttling electrons to the ubiquinone pool. We have discovered ascofuranone (), a natural compound produced by , and its derivatives are a potent class of HsDHODH inhibitors. We conducted a structure-activity relationship study and have identified functional groups of that are essential for the inhibition of HsDHODH enzymatic activity. Furthermore, the binding mode of and its derivatives to HsDHODH was demonstrated by co-crystallographic analysis and we show that these inhibitors bind at the ubiquinone binding site. In addition, the cytotoxicities of and its potent derivatives , , and were studied using human cultured cancer cells. Interestingly, they showed selective and strong cytotoxicity to cancer cells cultured under microenvironment (hypoxia and nutrient-deprived) conditions. The selectivity ratio of under this microenvironment show the most potent inhibition which was over 1000-fold higher compared to that under normal culture condition. Our studies suggest that under microenvironment conditions, cancer cells heavily depend on the pyrimidine biosynthesis pathway. We also provide the first evidence that and its derivatives are potential lead candidates for drug development which target the HsDHODH of cancer cells living under a tumor microenvironment.

PubMed: 30233375
DOI: 10.3389/fphar.2018.00997

Experimental method

X-RAY DIFFRACTION (1.79 Å)