D-lactic acid production by metabolically engineered Saccharomyces cerevisiae

J Biosci Bioeng. 2006 Feb;101(2):172-7. doi: 10.1263/jbb.101.172.

Abstract

Poly D-lactic acid is an important polymer because it improves the thermostability of poly L-lactic acid by the stereo complex formation. We constructed a metabolically engineered Saccharomyces cerevisiae that produces D-lactic acid efficiently. In this recombinant, the coding region of pyruvate decarboxylase 1 (PDC1) was completely deleted, and two copies of the D-lactate dehydrogenase (D-LDH) gene from Leuconostoc mesenteroides subsp. mesenteroides strain NBRC3426 were introduced into the genome. The D-lactate production reached 61.5 g/l, the amount of glucose being transformed into D-lactic acid being 61.2% under neutralizing conditions. Additionally, the yield of free D-lactic acid was also shown to be 53.0% under non-neutralizing conditions. It was confirmed that D-lactic acid of extremely high optical purity of 99.9% or higher. Our finding obtained the possibility of a new approach for pure d-lactic acid production without a neutralizing process compared with other techniques involving lactic acid bacteria and transgenic Escherichia coli.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Amino Acid Sequence
  • Base Sequence
  • Cloning, Molecular
  • Fermentation
  • Genetic Engineering / methods*
  • L-Lactate Dehydrogenase / genetics
  • L-Lactate Dehydrogenase / metabolism
  • Lactates / metabolism
  • Lactic Acid / biosynthesis*
  • Lactic Acid / metabolism
  • Leuconostoc / genetics
  • Molecular Sequence Data
  • Pyruvate Decarboxylase / genetics
  • Pyruvate Decarboxylase / metabolism
  • Recombinant Proteins / genetics
  • Recombinant Proteins / metabolism
  • Saccharomyces cerevisiae / genetics
  • Saccharomyces cerevisiae / metabolism*
  • Saccharomyces cerevisiae Proteins / genetics
  • Saccharomyces cerevisiae Proteins / metabolism
  • Sequence Homology, Amino Acid

Substances

  • Lactates
  • Recombinant Proteins
  • Saccharomyces cerevisiae Proteins
  • Lactic Acid
  • L-Lactate Dehydrogenase
  • PDC1 protein, S cerevisiae
  • Pyruvate Decarboxylase