Production of ergothioneine by Methylobacterium species

Kabir M. Alamgir, Sachiko Masuda, Yoshiko Fujitani, Fumio Fukuda, Akio Tani

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

Metabolomic analysis revealed that Methylobacterium cells accumulate a large amount of ergothioneine (EGT), which is a sulfur-containing, non-proteinogenic, antioxidative amino acid derived from histidine. EGT biosynthesis and its role in methylotrophy and physiology for plant surface-symbiotic Methylobacterium species were investigated in this study. Almost all Methylobacterium type strains can synthesize EGT. We selected one of the most productive strains (M. aquaticum strain 22A isolated from a moss), and investigated the feasibility of fermentative EGT production through optimization of the culture condition. Methanol as a carbon source served as the best substrate for production. The productivity reached up to 1000 μg/100 ml culture (1200 μg/g wet weight cells, 6.3 mg/g dry weight) in 38 days. Next, we identified the genes (egtBD) responsible for EGT synthesis, and generated a deletion mutant defective in EGT production. Compared to the wild type, the mutant showed better growth on methanol and on the plant surface as well as severe susceptibility to heat treatment and irradiation of ultraviolet (UV) and sunlight. These results suggested that EGT is not involved in methylotrophy, but is involved in their phyllospheric lifestyle fitness of the genus in natural conditions.

Original languageEnglish
Article number01185
JournalFrontiers in Microbiology
Volume6
Issue numberOCT
DOIs
Publication statusPublished - 2015

Keywords

  • Antioxidant
  • Ergothioneine
  • Glutathione
  • Methanol
  • Methylobacterium species
  • Methylotroph
  • Reactive oxygen species

ASJC Scopus subject areas

  • Microbiology
  • Microbiology (medical)

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