A Mutation in the Flavin-containing Monooxygenase 3 Gene and its Effects on Catalytic Activity for N-oxidation of Trimethylamine In Vitro

Megumi Kubota, Yoko Nakamoto, Kazuo Nakayama, Taisei Mushiroda, Tsuyoshi Yokoi, Tetsuya Kamataki, Pailin Ujjin, Soisungwan Satarug, Masato Funayama

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

To clarify the mutation of the flavin-containing monooxygenase (FMO) 3 gene causing fish-odor syndrome, we analyzed the FMO3 gene of a Thai subject who possibly suffered from fish-odor syndrome. A novel mutation, a single-base substitution from G to A at the position of 265 (G265A), was identified in exon 3. The mutation caused an amino acid substitution from valine to isoleucine at residue 58 (V58I). The mutated FMO3 protein with V58I exhibited the reduced trimethylamine N-oxidase activity when it was expressed in E. coli. The Vmax/Km value for the activity of the mutant-type FMO3 was about 5 times lower than that for the wild-type FMO3.

Original languageEnglish
Pages (from-to)207-213
Number of pages7
JournalDrug metabolism and pharmacokinetics
Volume17
Issue number3
DOIs
Publication statusPublished - 2002

Keywords

  • FMO3
  • fish-odor syndrome
  • trimethylamine
  • trimethylaminuria

ASJC Scopus subject areas

  • Pharmacology
  • Pharmaceutical Science
  • Pharmacology (medical)

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