Abstract
A Gram-positive, smooth, sub-transparent, faint yellow,0.5–0.7 µm diameter, rod shaped aerobic or facultative aerobic strain P40-2Twas isolated from livestock farms in Northeast China. Strain P40-2T grew at 25–40 °C (optimum 30–38 °C), and in 0–4% (w/v) NaCl (optimum 0%) in LB medium. Based on 16S rRNA gene sequence analysis, strain P40-2T belongs to the class Cellulomonas and is most closely related to C. denverensis strain W6929, C. pakistanensis strain NCCP-11and C. hominis strain CE40.DNA-DNA hybridization rate of strain P40-2T was 29%, and the ANI with C.denverensisstrainW6929 was 85.33%. The genome is 3437431 bp long with a G + C content of 71.99%. Of the 3177 predicted genes, 3119 were protein-coding genes and 58 were RNA encoding genes. The chemotaxonomic data: menaquinone was MK-9(H4), anteiso-C15: 0, C16:0 and anteiso-C17: 0 were the major cellular fatty acids, and the main cell-wall amino acids were ornithine,alanine, glycine and glutamate. The cell wall peptidogly can sugars included glucose, rhamnose, galactose and mannose. The polar lipid present were DPG, PG, PE, and PIM. On the basis of DNA-DNA relatedness, phylogenetic position, complete genome sequence and physiological characteristics, strain P40-2T can be differentiated from other species of the genus Cellulomonas with validly published names and thus represents a novel species, for which the name Cellulomonas taurus is proposed. The type strain is Cellulomonas taurus P40-2T (= CGMCC No.1.17732T).The acute toxicity test in mice showed that LD50 of strain P40-2T was rather high with 1.5 × 1011 CFU/mouse, which indicated low pathogenicity. Drug susceptibility showed that strainP40-2T was resistant to most antibiotics and only sensitive to six antibiotics. Strain P40-2T contained a variety of hydrolytic enzymes including the ability to hydrolyze cellulose, β-glucan, chitin, xylan, and casein. Microbial flocculant MBF-P40 for sewage was prepared with strain P40-2T, after strain P40-2T was confirmed that had good flocculation effect. MBF-P40 was used to prepare flocculation rate of 99.40%. MBF-P40 treatmented sewage from eight different sources. Flocculation rate for pig farm wastewater was 96.07%, COD removal rate is 71.05%, ammonia nitrogen removal rate is 18.22%. The result shows that MBF-P40 has a good flocculation effect, and good prospect of development and application for wastewater treatment.
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Data availability
The Whole Genome Shotgun project has been deposited at DDBJ/ENA/GenBank under the accession PRJNA625123.The 16S rRNA gene sequence of P40-2T were deposited in GenBank under accession numbers MN596022.
Abbreviations
- ANI:
-
Average nucleotide identity
- dDDH:
-
Digital DNA–DNA hybridization
- NEB:
-
New England BioLabs;SEM, Scanning Electron Microscope
- MALDI-TOF MS:
-
Matrix-assisted laser desorption ionization–time of flight mass spectrometry,
- DPG:
-
Diphosphatidyl glycerol
- PG:
-
Phosphatidylglycerol
- PE:
-
Phosphatidyl ethnolamine,
- PIM:
-
Phosphatidyl-myo-inositol marmoside
- COD:
-
Chemical oxygen demand
- AN:
-
Ammonia nitrogen
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This work was supported by financial assistance from The National Science and Technology Major Project of China, reference 2018YFD0500504, and also supported by a grant from Panjin CDC allocated to SS Zhang. The authors thank Jilin University Animal Medicine of College and Panjin Center for inspection and testing/Panjin CDC for the collaborative study conducted together.
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The authors whose names appear on the submission have contributed sufficiently to the scientific work and therefore share collective responsibility and accountability for the results. LZS and XJF conceived the idea of the study; ZSS, SXL and GW carried out the experiments and revised the manuscript.
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I certify that this manuscript is original and has not been published and will not be submitted elsewhere for publication while being considered by SS Zhang. And the study is not split up into several parts to increase the quantity of submissions and submitted to various journals or to one journal over time. No data have been fabricated or manipulated to support our conclusions. The research followed the spirit of science and humanity, and was approved by the welfare Ethical Committee of Jilin University Experimental Animal (2020004).
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Zhang, SS., Xu, JF., Sun, XL. et al. Cellulomonas taurus sp. nov., a novel bacteria with multiple hydrolase activity isolated from livestock, and potential application in wastewater treatment. Antonie van Leeuwenhoek 114, 527–538 (2021). https://doi.org/10.1007/s10482-021-01538-2
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DOI: https://doi.org/10.1007/s10482-021-01538-2