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<p>Terephthalic acid (TPA) from poly(ethylene terephthalate) (PET) depolymerization is a promising substrate for microbial upcycling, yet complete degradation at high concentrations has not been reported above 120&#xa0;mM. Here, we report seven <i>Rhodococcus</i> strains isolated from compost enrichment cultures using TPA as the sole carbon source. Three isolates completely consumed 240&#xa0;mM TPA in minimal medium under high osmolarity conditions, surpassing the previously reported threshold. Strain TA18 produced β-linked exopolysaccharides and a polyhydroxyalkanoate composed mainly of 3-hydroxyvalerate from TPA as the sole carbon source, neither of which has been previously described from this substrate in <i>Rhodococcus</i>, alongside C16 and C18 fatty acids. These strains expand the set of robust TPA-assimilating bacteria available for PET upcycling and provide a foundation for developing routes that convert plastic waste streams into multiple microbial products.</p>

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High-load terephthalic acid degradation and diverse bioproduct formation by novel Rhodococcus strains

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月13日

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  • Caio Issamu Somiza,
  • Nívea Moreira Vieira,
  • Alex Gazolla de Castro,
  • Isabela Pereira da Silva Bento,
  • Kleryton Luiz Alves de Oliveira,
  • Lívia Moreira Couto,
  • Jomar de Lima Barros,
  • Camila de Souza Vieira,
  • Wendel Batista da Silveira,
  • Renata Pereira Lopes Moreira,
  • Marcos Rogério Tótola

摘要

Terephthalic acid (TPA) from poly(ethylene terephthalate) (PET) depolymerization is a promising substrate for microbial upcycling, yet complete degradation at high concentrations has not been reported above 120 mM. Here, we report seven Rhodococcus strains isolated from compost enrichment cultures using TPA as the sole carbon source. Three isolates completely consumed 240 mM TPA in minimal medium under high osmolarity conditions, surpassing the previously reported threshold. Strain TA18 produced β-linked exopolysaccharides and a polyhydroxyalkanoate composed mainly of 3-hydroxyvalerate from TPA as the sole carbon source, neither of which has been previously described from this substrate in Rhodococcus, alongside C16 and C18 fatty acids. These strains expand the set of robust TPA-assimilating bacteria available for PET upcycling and provide a foundation for developing routes that convert plastic waste streams into multiple microbial products.