Bioreaction Engineering Leading to Efficient Synthesis of L-Glyceraldehyd-3-Phosphate

Getachew Shibabaw Molla, Birhanu M. Kinfu, Jennifer Chow, Wolfgang Streit, Roland Wohlgemuth, Andreas Liese

Research output: Contribution to journalJournal articleResearchpeer-review


Enantiopure L-glyceraldehyde-3-phosphate (L-GAP) is a useful building block in natural biological and synthetic processes. A biocatalytic process using glycerol kinase from Cellulomonas sp. (EC catalyzed phosphorylation of L-glyceraldehyde (L-GA) by ATP was used for the synthesis of L-GAP. L-GAP has a half-life of 6.86 h under reaction conditions. The activity this enzyme depends on the Mg2+ to ATP molar ratio showing maximum activity at the optimum molar ratio of 0.7. A kinetic model was developed and validated showing a 2-D correlation of 99.9% between experimental and numerical data matrices. The enzyme exhibits inhibition by ADP, AMP, methylglyoxal and Ca2+, but not by L-GAP and inorganic orthophosphate. Moreover, equal amount of Ca2+ exerts a different degree of inhibition relative to the activity without the addition of Ca2+ depending on the Mg2+ to ATP molar ratio. If the Mg2+ to ATP molar ratio is set to be at the optimum value or less, inorganic hexametaphosphate (PPi6) suppresses the enzyme activity; otherwise PPi6 enhances the enzyme activity. Based on reaction engineering parameters such as conversion, selectivity and specific productivity, evaluation of different reactor types reveals that batchwise operation via stirred-tank reactor is the most efficient process for the synthesis of L-GAP.
Original languageEnglish
JournalBiotechnology Journal
Number of pages16
Publication statusE-pub ahead of print - 2016
Externally publishedYes


  • Glycerol kinase
  • L-Glyceraldehyde-3-phosphate instability
  • Mg2+ to ATP ratio
  • Reaction kinetics
  • Reactor simulation


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