ArticleScientific reports2025
Degradation capability of Acinetobacter indicus LXX12 on tobacco straw and its whole genome analysis.
Article in Scientific reports, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.
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6 authors.
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Abstract
A high-efficiency tobacco straw-degrading strain, Acinetobacter indicus LXX12, was isolated from tobacco-planting soil in Anshun City, Guizhou Province, China. Systematic investigations were conducted on its physiological and biochemical characteristics, environmental adaptability, and degradation mechanisms. The strain is a Gram-negative, non-motile aerobic bacterium capable of tolerating extreme conditions, including a pH range of 6-11, salinity up to 10%, and temperatures between 15 °C and 44 °C, while exhibiting notable nicotine tolerance. The strain demonstrated robust cellulolytic activity, with a CMCase activity of 65.25 U/mL after 24 h incubation. Inoculation with LXX12 resulted in a 65.7% weight loss of tobacco straw after 35 days of treatment. Scanning electron microscopy (SEM) and Fourier-transform infrared spectroscopy (FTIR) analyses confirmed its synergistic degradation of cellulose, hemicellulose, and lignin. Whole-genome sequencing revealed that the strain's genome harbors 65 CAZy enzyme genes, including 11 glycoside hydrolases (GH3 and GH5 family endoglucanases and β-glucosidases) for cellulose degradation, 6 auxiliary redox enzymes (AA3, AA4, and AA6 family vanillyl alcohol oxidases and 1,4-benzoquinone reductases) for lignin modification, as well as CE3 acetylxylan esterases and CBM50 substrate-binding modules. These enzymes collectively form a "backbone depolymerization-side chain modification-redox-driven" multi-enzyme synergistic network. KEGG pathway analysis further elucidated its capability to convert lignin derivatives into carbon sources via benzoate degradation, glycolysis, and the tricarboxylic acid (TCA) cycle. Based on 16 S rDNA sequence alignment, the strain showed 99.78% similarity to Acinetobacter indicus CIP 110,367 strain A648, and was designated Acinetobacter indicus LXX12 despite notable phenotypic discrepancies. The isolation and functional characterization of this strain provide a novel microbial resource for lignocellulose bioconversion, combining high efficiency with environmental adaptability, and hold significant potential for agricultural waste valorization.
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