ArticleBMC microbiology2026
A novel HN-AD strain Paenibacillus glycanilyticus DQ-1 with high-efficiency nitrogen removal capacity: genomic insights into its nitrogen metabolic mechanism.
Article in BMC microbiology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
backgroundThe rapid expansion of the aquaculture industry has intensified the discharge of nitrogen-rich wastewater, posing significant ecological risks. Biological treatment with HN-AD bacteria is sustainable, but most conventional strains lack long-term environmental resilience. The key bottleneck is identifying novel, robustly adaptable strains, especially spore-forming Gram-positive bacteria. Moreover, the non-canonical metabolic mechanisms that distinguish such strains remain largely unexplored. This study isolated a novel HN-AD strain, Paenibacillus glycanilyticus DQ-1, from aquaculture sludge and investigated its nitrogen removal performance and genomic metabolic pathways.
methodsStrain DQ-1 was isolated and identified through 16 S rRNA gene sequencing and morphological analysis. Its nitrogen removal efficiency was evaluated under aerobic conditions with different nitrogen sources, including ammonium nitrogen (NH₄
resultsStrain DQ-1 achieved 93.26% NH₄⁺-N and 100% NO₃⁻-N removal within 36 h, with 95.92% TIN removal. Genomic analysis revealed a complete assimilatory nitrate reduction pathway (nasAB and nirBD). Notably, while the canonical hydroxylamine oxidoreductase gene (hao) is absent, the strain showed 74.67% NH
conclusionsP. glycanilyticus DQ-1 differs from typical HN-AD bacteria in its spore-forming ability and a novel hao-independent pathway. This study provides the first comprehensive genomic insight into the nitrogen removal capacity of P. glycanilyticus, expanding the microbial resource pool for sustainable environmental remediation.
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