Protein instability and functional defects caused by mutations of dihydro-orotate dehydrogenase in Miller syndrome patients

Jing Xian Fang, Takeshi Uchiumi, Mikako Yagi, Shinya Matsumoto, Rie Amamoto, Toshiro Saito, Shinya Takazaki, Tomotake Kanki, Haruyoshi Yamaza, Kazuaki Nonaka, Dongchon Kang

研究成果: Contribution to journalArticle査読

18 被引用数 (Scopus)

抄録

Miller syndrome is a recessive inherited disorder characterized by postaxial acrofacial dysostosis. It is caused by dysfunction of the DHODH (dihydroorotate dehydrogenase) gene, which encodes a key enzyme in the pyrimidine de novo biosynthesis pathway and is localized at mitochondria intermembrane space. We investigated the consequence of three missense mutations, G202A, R346W and R135C of DHODH, which were previously identified in patients with Miller syndrome. First, we established HeLa cell lines stably expressing DHODH with Miller syndrome-causative mutations: G202A, R346W and R135C. These three mutant proteins retained the proper mitochondrial localization based on immunohistochemistry and mitochondrial subfractionation studies. The G202A, R346W DHODH proteins showed reduced protein stability. On the other hand, the third one R135C, in which the mutation lies at the ubiquinone-binding site, was stable but possessed no enzymatic activity. In conclusion, the G202A and R346W mutation causes deficient protein stability, and the R135C mutation does not affect stability but impairs the substrate-induced enzymatic activity, suggesting that impairment of DHODH activity is linked to the Miller syndrome phenotype.

本文言語英語
ページ(範囲)631-639
ページ数9
ジャーナルBioscience reports
32
6
DOI
出版ステータス出版済み - 12 2012

All Science Journal Classification (ASJC) codes

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Cell Biology

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