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Towards Methionine Overproduction in Corynebacterium glutamicum - Methanethiol and Dimethyldisulfide as Reduced Sulfur Sources

  • Bolten, Christoph J. (Biochemical Engineering Institute, Technische Universitat Braunschweig) ;
  • Schroder, Hartwig (BASF SE, Research Fine Chemicals and Biotechnology) ;
  • Dickschat, Jeroen (Organic Chemistry Institute, Technische Universitat Braunschweig) ;
  • Wittmann, Christoph (Biochemical Engineering Institute, Technische Universitat Braunschweig)
  • 투고 : 2010.02.17
  • 심사 : 2010.04.14
  • 발행 : 2010.08.28

초록

In the present work, methanethiol and dimethyldisulfide were investigated as sulfur sources for methionine synthesis in Corynebacterium glutamicum. In silico pathway analysis predicted a high methionine yield for these reduced compounds, provided that they could be utilized. Wild-type cells were able to grow on both methanethiol and dimethyldisulfide as sole sulfur sources. Isotope labeling studies with mutant strains, exhibiting targeted modification of methionine biosynthesis, gave detailed insight into the underlying pathways involved in the assimilation of methanethiol and dimethyldisulfide. Both sulfur compounds are incorporated as an entire molecule, adding the terminal S-$CH_3$ group to O-acetylhomoserine. In this reaction, methionine is directly formed. MetY (O-acetylhomoserine sulfhydrylase) was identified as the enzyme catalyzing the reaction. The deletion of metY resulted in methionine auxotrophic strains grown on methanethiol or dimethyldisulfide as sole sulfur sources. Plasmid-based overexpression of metY in the ${\Delta}$metY background restored the capacity to grow on methanethiol or dimethyldisulfide as sole sulfur sources. In vitro studies with the C. glutamicum wild type revealed a relatively low activity of MetY for methanethiol (63 mU/mg) and dimethyldisulfide (61 mU/mg). Overexpression of metY increased the in vitro activity to 1,780 mU/mg and was beneficial for methionine production, since the intracellular methionine pool was increased 2-fold in the engineered strain. This positive effect was limited by a depletion of the metY substrate O-acetylhomoserine, suggesting a need for further metabolic engineering targets towards competitive production strains.

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