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Bacillus pumilus B12 Degrades Polylactic Acid and Degradation Is Affected by Changing Nutrient Conditions.
Bonifer, Kyle S; Wen, Xianfang; Hasim, Sahar; Phillips, Elise K; Dunlap, Rachel N; Gann, Eric R; DeBruyn, Jennifer M; Reynolds, Todd B.
Afiliação
  • Bonifer KS; Department of Microbiology, University of Tennessee, Knoxville, Knoxville, TN, United States.
  • Wen X; Department of Biosystems Engineering and Soil Science, Institute of Agriculture, University of Tennessee, Knoxville, Knoxville, TN, United States.
  • Hasim S; Department of Microbiology, University of Tennessee, Knoxville, Knoxville, TN, United States.
  • Phillips EK; Department of Microbiology, University of Tennessee, Knoxville, Knoxville, TN, United States.
  • Dunlap RN; Department of Biosystems Engineering and Soil Science, Institute of Agriculture, University of Tennessee, Knoxville, Knoxville, TN, United States.
  • Gann ER; Department of Microbiology, University of Tennessee, Knoxville, Knoxville, TN, United States.
  • DeBruyn JM; Department of Biosystems Engineering and Soil Science, Institute of Agriculture, University of Tennessee, Knoxville, Knoxville, TN, United States.
  • Reynolds TB; Department of Microbiology, University of Tennessee, Knoxville, Knoxville, TN, United States.
Front Microbiol ; 10: 2548, 2019.
Article em En | MEDLINE | ID: mdl-31824441
Poly-lactic acid (PLA) is increasingly used as a biodegradable alternative to traditional petroleum-based plastics. In this study, we identify a novel agricultural soil isolate of Bacillus pumilus (B12) that is capable of degrading high molecular weight PLA films. This degradation can be detected on a short timescale, with significant degradation detected within 48-h by the release of L-lactate monomers, allowing for a rapid identification ideal for experimental variation. The validity of using L-lactate as a proxy for degradation of PLA films is corroborated by loss of rigidity and appearance of fractures in PLA films, as measured by atomic force microscopy and scanning electron microscopy (SEM), respectively. Furthermore, we have observed a dose-dependent decrease in PLA degradation in response to an amino acid/nucleotide supplement mix that is driven mainly by the nucleotide base adenine. In addition, amendments of the media with specific carbon sources increase the rate of PLA degradation, while phosphate and potassium additions decrease the rate of PLA degradation by B. pumilus B12. These results suggest B. pumilus B12 is adapting its enzymatic expression based on environmental conditions and that these conditions can be used to study the regulation of this process. Together, this work lays a foundation for studying the bacterial degradation of biodegradable plastics.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Front Microbiol Ano de publicação: 2019 Tipo de documento: Article País de afiliação: Estados Unidos

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Front Microbiol Ano de publicação: 2019 Tipo de documento: Article País de afiliação: Estados Unidos