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Identification and characterization of novel poly(dl-lactic acid) depolymerases from metagenome

  • Biotechnologically Relevant Enzymes and Proteins
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Abstract

Many poly(lactic acid) (PLA)-degrading microorganisms have been isolated from the natural environment by culture-based methods, but there is no study about unculturable PLA-degrading microorganisms. In this study, we constructed a metagenomic library consisting of the DNA extracted from PLA disks buried in compost. We identified three PLA-degrading genes encoding lipase or hydrolase. The purified enzymes degraded not only PLA, but also various aliphatic polyesters, tributyrin, and p-nitrophenyl esters. From their substrate specificities, the PLA depolymerases were classified into an esterase rather than a lipase. Among the PLA depolymerases, PlaM4 exhibited thermophilic properties; that is, it showed the highest activity at 70 °C and was stable even after incubation for 1 h at 50 °C. PlaM4 had absorption and degradation activities for solid PLA at 60 °C, which indicates that the enzyme can effectively degrade PLA in a high-temperature environment. On the other hand, the enzyme classification based on amino acid sequences showed that the other PLA depolymerases, PlaM7 and PlaM9, were not classified into known lipases or esterases. This is the first report on the identification and characterization of PLA depolymerase from a metagenome.

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Authors and Affiliations

  1. Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Ibaraki, 305-8572, Japan

    Daisuke Mayumi, Yukie Akutsu-Shigeno, Hiroo Uchiyama, Nobuhiko Nomura & Toshiaki Nakajima-Kambe

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  1. Daisuke Mayumi
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  2. Yukie Akutsu-Shigeno
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  3. Hiroo Uchiyama
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  4. Nobuhiko Nomura
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  5. Toshiaki Nakajima-Kambe
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Correspondence to Toshiaki Nakajima-Kambe.

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Mayumi, D., Akutsu-Shigeno, Y., Uchiyama, H. et al. Identification and characterization of novel poly(dl-lactic acid) depolymerases from metagenome. Appl Microbiol Biotechnol 79, 743–750 (2008). https://doi.org/10.1007/s00253-008-1477-3

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  • DOI: https://doi.org/10.1007/s00253-008-1477-3

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