Kinetic modeling and sensitivity analysis of xylose metabolism in Lactococcus lactis IO-1

Mugihito Oshiro, Hideaki Shinto, Yukihiro Tashiro, Noriko Miwa, Tatsuya Sekiguchi, Masahiro Okamoto, Ayaaki Ishizaki, Kenji Sonomoto

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)


We proposed a kinetic simulation model of xylose metabolism in Lactococcus lactis IO-1 that describes the dynamic behavior of metabolites using the simulator WinBEST-KIT. This model was developed by comparing the experimental time-course data of metabolites in batch cultures grown in media with initial xylose concentrations of 20.3-57.8 g/l with corresponding calculated data. By introducing the terms of substrate activation, substrate inhibition, and product inhibition, the revised model showed a squared correlation coefficient (r2) of 0.929 between the experimental time-course of metabolites and the calculated data. Thus, the revised model is assumed to be one of the best candidates for kinetic simulation describing the dynamic behavior of metabolites. Sensitivity analysis revealed that pyruvate flux distribution is important for higher lactate production. To confirm the validity of our kinetic model, the results of the sensitivity analysis were compared with enzyme activities observed during increasing lactate production by adding natural rubber serum powder to the xylose medium. The experimental results on pyruvate flux distribution were consistent with the prediction by sensitivity analysis.

Original languageEnglish
Pages (from-to)376-384
Number of pages9
JournalJournal of Bioscience and Bioengineering
Issue number5
Publication statusPublished - Nov 2009

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Bioengineering
  • Applied Microbiology and Biotechnology


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