Identification and characterization of a novel 2,3-butanediol dehydrogenase/acetoin reductase from Corynebacterium crenatum SYPA5-5

Lett Appl Microbiol. 2015 Dec;61(6):573-9. doi: 10.1111/lam.12495. Epub 2015 Nov 2.

Abstract

Acetoin and 2,3-butanediol are widely used in the chemical and pharmaceutical industries. The enzyme, 2,3-butanediol dehydrogenase/acetoin reductase (2,3-BDH/AR), plays a significant role in the microbial production of acetoin and 2,3-butanediol by catalysing a reversible reaction between acetoin and 2,3-butanediol. To date, a 2,3-BDH has not been characterized from Corynebacterium crenatum. 2,3-BDH was cloned from Coryne. crenatum SYPA5-5 and expressed in Escherichia coli BL21. Sequence analysis suggested that the 2,3-BDH from Coryne. crenatum SYPA5-5 belongs to the short-chain dehydrogenase/reductase superfamily. Its maximum specific activity was obtained at 35°C, however, it became very unstable when the temperature was above 35°C. Its optimal pH was 4·0 for reduction reaction and 10·0 for oxidation reaction. The 2,3-BDH activity was increased to some extent by Ca(2+) , Mg(2+) , Zn(2+) and Mn(2+) ions. In particular, Ca(2+) induced about 1·5-fold increase. The value of kcat /Km for diacetyl and acetoin are higher than for 2,3-butanediol indicating that 2,3-BDH can easily reduce diacetyl or acetoin to 2,3-butanediol under lower pH conditions. The characteristics of 2,3-BDH from Coryne. crenatum SYPA5-5 will give guide to further studies for the production of acetoin and 2,3-butanediol with engineered Coryne. crenatum SYPA5-5.

Significance and impact of the study: Acetoin and 2,3-butanediol are commonly used as platform chemicals and widely used in pharmaceutical industries. 2,3-butanediol dehydrogenase/acetoin reductase (2,3-BDH/AR) plays a significant role in the microbial production of acetoin and 2,3-butanediol. In this study, 2,3-BDH was cloned from Corynebacterium crenatum SYPA5-5, was expressed in Escherichia coli BL21 and characterized with respect to the optimal temperature, pH, substrate specificity and kinetics. The results will guide further studies in Coryne. crenatum SYPA5-5 for the production of acetoin and 2,3-butanediol.

Keywords: 2,3-butanediol dehydrogenase; Corynebacterium crenatum SYPA5-5; acetoin reductase; characterization; expression.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Acetoin / metabolism*
  • Alcohol Oxidoreductases / genetics*
  • Alcohol Oxidoreductases / isolation & purification*
  • Alcohol Oxidoreductases / metabolism
  • Amino Acid Sequence
  • Butylene Glycols / metabolism*
  • Cloning, Molecular
  • Corynebacterium / enzymology*
  • Corynebacterium / genetics
  • Escherichia coli / genetics
  • Escherichia coli / metabolism
  • Kinetics
  • Molecular Sequence Data
  • Sequence Alignment
  • Substrate Specificity
  • Temperature

Substances

  • Butylene Glycols
  • 2,3-butylene glycol
  • Acetoin
  • Alcohol Oxidoreductases
  • butanediol dehydrogenase

Associated data

  • GENBANK/KR611534