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<p>Lignin-derived aromatic compounds have significant potential for multiple industrial applications, and elucidating the processes for bacterial lignin degradation processes can facilitate the utilization of plant biomass. A lignin-degrading bacterial strain, designated HZC-1, was newly isolated from saline-alkali soil and exhibited robust growth in 1–18% (w/v) NaCl and across a pH range of 5.0–11.0. The isolate showed the highest 16S rRNA gene sequence similarity (≤ 97.7%) to known <i>Salinicoccus</i> species. Furthermore, average nucleotide identity (≤ 82.34) and digital DNA-DNA hybridization (≤ 52.9%) analyses supported its classification as a potentially novel species within the genus <i>Salinicoccus</i>. Genomic annotation indicated that strain HZC-1 adapted to saline-alkali environments via multiple mechanisms such as Na<sup>+</sup>/H<sup>+</sup> antiporter and glycine betaine transport systems. By combining genomic and untargeted metabolomic data, it can be inferred that this strain was capable of metabolizing lignin derivatives through non-classical pathways involving enzymes such as β-glucosidase, aromatic cyclohydroxyl dioxygenase and those associated with naphthalene degradation. These findings suggest the potential lignin-degrading capacity of <i>Salinicoccus</i> sp. HZC-1 under saline-alkali conditions, presenting a potentially novel bacterial taxon for waste lignin valorization and bioremediation of aromatic pollutants.</p>

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Genomic and metabonomic insights into the lignin-degrading potential of a novel halophilic bacterial strain Salinicoccus sp. HZC-1

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年9月26日

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  • Fengqian Yang,
  • Longzhan Gan,
  • Zhicheng He,
  • Haoran Zhang,
  • Yuxin Yang,
  • Chunbo Dong,
  • Xiao Zou

摘要

Lignin-derived aromatic compounds have significant potential for multiple industrial applications, and elucidating the processes for bacterial lignin degradation processes can facilitate the utilization of plant biomass. A lignin-degrading bacterial strain, designated HZC-1, was newly isolated from saline-alkali soil and exhibited robust growth in 1–18% (w/v) NaCl and across a pH range of 5.0–11.0. The isolate showed the highest 16S rRNA gene sequence similarity (≤ 97.7%) to known Salinicoccus species. Furthermore, average nucleotide identity (≤ 82.34) and digital DNA-DNA hybridization (≤ 52.9%) analyses supported its classification as a potentially novel species within the genus Salinicoccus. Genomic annotation indicated that strain HZC-1 adapted to saline-alkali environments via multiple mechanisms such as Na+/H+ antiporter and glycine betaine transport systems. By combining genomic and untargeted metabolomic data, it can be inferred that this strain was capable of metabolizing lignin derivatives through non-classical pathways involving enzymes such as β-glucosidase, aromatic cyclohydroxyl dioxygenase and those associated with naphthalene degradation. These findings suggest the potential lignin-degrading capacity of Salinicoccus sp. HZC-1 under saline-alkali conditions, presenting a potentially novel bacterial taxon for waste lignin valorization and bioremediation of aromatic pollutants.