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Bioplastics derived from microbial processes present a sustainable alternative to conventional petroleum-based plastics. Among these, polyhydroxyalkanoates (PHAs), particularly polyhydroxybutyrates (PHBs), have emerged as prominent candidates due to their biodegradability and biocompatibility. These polymers are synthesized by a variety of bacteria, such as Cupriavidus necator and Pseudomonas putida, which naturally accumulate PHAs as intracellular carbon and energy reserves, especially under...
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Extracellular Polyhydroxyalkanoate Depolymerase by Acidovorax sp. DP5.

S Vigneswari1, T S Lee2, Kesaven Bhubalan3

  • 1Malaysian Institute of Pharmaceuticals and Nutraceuticals, NIBM, MOSTI, 11700 Penang, Malaysia ; Institute of Marine Biotechnology, Universiti Malaysia Terengganu, 21030 Kuala Terengganu, Malaysia.

Enzyme Research
|December 15, 2015
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Summary
This summary is machine-generated.

Researchers isolated bacteria capable of degrading polyhydroxyalkanoates (PHA). The Acidovorax sp. DP5 strain showed the highest degradation activity, with optimal enzyme function at pH 9 and 40°C.

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Area of Science:

  • Microbiology
  • Biotechnology
  • Environmental Science

Background:

  • Polyhydroxyalkanoates (PHA) are biodegradable polymers with potential applications in sustainable materials.
  • Efficient degradation of PHA is crucial for its environmental management and recycling.
  • Microbial enzymes, specifically PHA depolymerases, play a key role in PHA biodegradation.

Purpose of the Study:

  • To isolate and identify bacteria capable of degrading PHA from Malaysian environments.
  • To characterize the extracellular depolymerase enzyme produced by the most potent bacterial isolate.
  • To determine the optimal conditions for PHA degradation by the isolated enzyme.

Main Methods:

  • Isolation of PHA-degrading bacteria from soil and water samples using poly(3-hydroxybutyrate) [P(3HB)] agar plates.
  • Screening for isolates exhibiting clear zones indicating depolymerase activity.
  • Biochemical characterization and 16S rRNA gene sequencing for bacterial identification.
  • Optimization of culture media components (carbon and nitrogen sources) for enzyme production.
  • Determination of optimal pH and temperature for depolymerase activity.

Main Results:

  • Eight bacterial isolates showed PHA-degrading capabilities, with isolate DP5 exhibiting the largest clearing zone (degradation index of 6.0).
  • Isolate DP5 was identified as Acidovorax sp. DP5.
  • Optimal enzyme production was achieved using 0.25% P(3HB) and 1 g/L urea.
  • The depolymerase enzyme demonstrated high degradation activity on P(3HB) films at pH 9 and 40°C.

Conclusions:

  • Acidovorax sp. DP5 is a potent PHA-degrading bacterium with significant extracellular depolymerase activity.
  • The identified depolymerase enzyme shows optimal activity under alkaline conditions and moderate temperatures.
  • This finding contributes to the understanding of microbial PHA degradation and offers potential for biotechnological applications in PHA recycling and management.