3 Biotech

, 9:359 | Cite as

Biodegradation of polyhydroxybutyrate by Pseudomonas sp. DSDY0501 and purification and characterization of polyhydroxybutyrate depolymerase

  • Yao Di
  • Hongmei Xia
  • Yang Jiao
  • Xiaonan Zhang
  • Qiang Fang
  • Fan LiEmail author
  • Shan ChenEmail author
Original Article


Strain DSDY0501 with polyhydroxybutyrate (PHB)-degrading ability was isolated from activated sludge. The morphological, physiological, and biochemical properties of the strain and phylogenetic analysis indicated that the strain belongs to Pseudomonas sp. The strain used PHB as the sole carbon source and degraded PHB films completely in 21 h in liquid culture. An extracellular PHB depolymerase was purified from the supernatant of the culture by ultrafiltration and Sephacryl S-200 gel filtration. The specific activity of the purified enzyme increased 24.2-fold, and the recovery yield was 16.61%. Extracellular PHB depolymerase, a monomeric enzyme with a molecular weight of approximately 57.9 kDa, showed optimum activity at 60 °C and pH 9.0, and was stable in the temperature range of 10–60 °C and a pH range of 6.0–10.0. The secondary structure of the enzyme contained approximately 60% α-helix and 40% β-pleated sheet according to the circular dichroism spectrum. Mass spectrum analysis showed that the main degradation product of the enzyme was PHB monomer, indicating the exo-type action of this PHB depolymerase.


Polyhydroxybutyrate (PHB) Biodegradation PHB depolymerase 



This research was supported by the National Natural Science Foundation of China (Grant No. 31670122).

Compliance with ethical standards

Conflict of interest

The authors have declared no conflict of interest.


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Copyright information

© King Abdulaziz City for Science and Technology 2019

Authors and Affiliations

  1. 1.School of Life SciencesNortheast Normal UniversityChangchunChina
  2. 2.School of Life Physical EducationNortheast Normal UniversityChangchunChina
  3. 3.Library of Northeast Normal UniversityChangchunChina
  4. 4.School of Chemical and Life SciencesChangchun University of TechnologyChangchunChina

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