Abstract
Two yeast strains, which have the ability to degrade biodegradable plastic films, were isolated from the larval midgut of a stag beetle, Aegus laevicollis. Both of them are most closely related to Cryptococcus magnus and could degrade biodegradable plastic (BP) films made of poly(butylene succinate) (PBS) and poly(butylene succinate-co-adipate) (PBSA) effectively. A BP-degrading enzyme was purified from the culture broth of one of the isolated strains employing a newly developed affinity purification method based on the binding action of the enzyme to the substrate (emulsified PBSA) and its subsequent degradative action toward the substrate. Partial amino acid sequences of this enzyme suggested that it belongs to the cutinase family, and thus, the enzyme was named CmCut1. It has a molecular mass of 21 kDa and a degradative activity for emulsified PBSA which was significantly enhanced by the simultaneous presence of Ca2+ or Mg2+ at a concentration of about 2.5 mM. Its optimal pH was 7.5, and the optimal temperature was 40 °C. It showed a broad substrate specificity for p-nitrophenyl (pNP)-fatty acid esters ranging from pNP-acetate (C2) to pNP-stearate (C18) and films of PBSA, PBS, poly(ε-caprolactone), and poly(lactic acid).
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Acknowledgments
We thank Showa Denko K. K. for generously supplying the Bionolle materials (PBS and PBSA) and Ms. C. Xiao-Hong for the technical assistance. We also acknowledge Dr. H. Iefuji and Dr. T. Nakajima-Kambe as well as Dr. E. Suto for the valuable comments in this research. This research was financially supported by the Ministry of the Environment, KAKENHI (235658083), and the National Institute for Agro-Environmental Sciences, Japan.
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Suzuki, K., Sakamoto, H., Shinozaki, Y. et al. Affinity purification and characterization of a biodegradable plastic-degrading enzyme from a yeast isolated from the larval midgut of a stag beetle, Aegus laevicollis . Appl Microbiol Biotechnol 97, 7679–7688 (2013). https://doi.org/10.1007/s00253-012-4595-x
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DOI: https://doi.org/10.1007/s00253-012-4595-x