Production and characterization of alcohol oxidase from Penicillium purpurescens AIU 063

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Kimiyasu Isobe1, Toyofumi Takahashi, Jun Ogawa

  • 1Department of Agro-bioscience, Iwate University, Ueda 3-18-8, Morioka 020-8550, Japan. kiso@iwate-u.ac.jp

Journal of Bioscience and Bioengineering
|February 17, 2009
PubMed

Insights

A novel alcohol oxidase (AOD) was isolated from Penicillium purpurescens, showing unique properties compared to yeast-derived enzymes. This enzyme effectively oxidizes short-chain alcohols and ethylene glycol, with enhanced activity under specific conditions.

Area of Science:

  • Biochemistry
  • Enzymology
  • Mycology

Background:

  • Filamentous fungi are a source of novel enzymes with industrial applications.
  • Alcohol oxidases (AODs) play a role in alcohol metabolism and detoxification.
  • Understanding AOD properties is crucial for biotechnological applications.

Purpose of the Study:

  • To isolate and characterize a novel alcohol oxidase from Penicillium purpurescens.
  • To compare the properties of this fungal AOD with those from methylotrophic yeasts.
  • To investigate the substrate specificity and optimal conditions for AOD activity.

Main Methods:

  • Isolation and cultivation of Penicillium purpurescens in methanol medium.
  • Enzyme assays to determine alcohol oxidase activity and substrate specificity.
  • Biochemical characterization including subunit analysis and determination of kinetic parameters (Km).
  • Enzyme activity enhancement studies under varying pH and temperature.

Main Results:

  • A strain of Penicillium purpurescens was identified that produces alcohol oxidase (AOD).
  • The fungal AOD effectively oxidizes short-chain primary alcohols and ethylene glycol.
  • The enzyme comprises four identical 66 kDa subunits, differing from the eight subunits found in yeast AODs.
  • Enzyme activity was enhanced twofold by pre-incubation at pH 6.0 and 40°C, without altering Km values for ethanol and ethylene glycol.

Conclusions:

  • Penicillium purpurescens is a source of a unique alcohol oxidase with distinct structural properties.
  • The characterized AOD exhibits potential for biotechnological applications in alcohol oxidation.
  • Further research can explore the optimization of this enzyme for industrial processes.

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