Abstract
Paraphoma-related fungal strain B47-9 secreted a biodegradable plastic (BP)-degrading enzyme which amounted to 68 % (w/w) of the total secreted proteins in a culture medium containing emulsified poly(butylene succinate-co-adipate) (PBSA) as sole carbon source. The gene for this enzyme was found to be composed of an open reading frame consisting of 681 nucleotides encoding 227 amino acids and two introns. Southern blot analysis showed that this gene exists as a single copy. The deduced amino acid sequence suggested that this enzyme belongs to the cutinase (E.C.3.1.1.74) family; thus, it was named P araphoma-related fungus cutinase-like enzyme (PCLE). It degraded various types of BP films, such as poly(butylene succinate), PBSA, poly(butylene adipate-co-terephthalate), poly(ε-caprolactone), and poly(dl-lactic acid). It has a molecular mass of 19.7 kDa, and an optimum pH and temperature for degradation of emulsified PBSA of 7.2 and 45 °C, respectively. Ca2+ ion at a concentration of about 1.0 mM markedly enhanced the degradation of emulsified PBSA.
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Acknowledgments
We thank Showa Denko K. K. for generously supplying the Bionolle materials. We also acknowledge Dr. E. Suto for the valuable comments in this research. This research was financially supported by the Science and Technology Research Promotion Program for Agriculture, Forestry, Fisheries and Food Industry and the National Institute for Agro-Environmental Sciences, Japan.
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Ken Suzuki and Masako Tsujimoto Noguchi contributed equally to this work.
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Suzuki, K., Noguchi, M.T., Shinozaki, Y. et al. Purification, characterization, and cloning of the gene for a biodegradable plastic-degrading enzyme from Paraphoma-related fungal strain B47-9. Appl Microbiol Biotechnol 98, 4457–4465 (2014). https://doi.org/10.1007/s00253-013-5454-0
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DOI: https://doi.org/10.1007/s00253-013-5454-0