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Propylenella binzhouense gen. nov., sp. nov. isolated from activated sludge, and proposal of Propylenellaceae fam. nov.

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Abstract

A Gram-stain-negative, non-spore-forming, non-motile, short-rod-shaped, and aerobic bacterial strain (designated L72T) was isolated from propylene oxide saponification wastewater activated sludge obtained from a wastewater treatment facility in Binzhou (Shandong Province, PR China). Strain L72T grew between 25 and 40 °C (optimum growth at 30 °C). The pH range for growth was between 6.0 and 8.0 (optimum growth at pH 7.0). The range of NaCl concentrations for the growth of strain L72T was 0–3.0 % (w/v), with optimum growth at 1.0–2.0 % (w/v). The major cellular fatty acids of strain L72T were C19:0cyclo ω8c, C18:1ω7c, iso-C15:0, and anteiso-C15:0. Strain L72T contained Q–10 as the predominant respiratory quinone. The polar lipid profile was composed of Phosphatidylcholine, Glycolipid, Aminophospholipid, Phosphatidylethanolamine, Phosphatidylserine, Phosphatidyldimethylethanolamine, one unknown lipid (L) and two unidentified Phospholipids (PL). Genome sequencing revealed a genome size of 4,703,686 bp and a G + C content of 69.0 mol%. The 16S rRNA gene sequence similarities of strain L72T with other species were less than 94%. Phylogenetic analyses based on 16S rRNA gene sequences and genome data, revealed that strain L72T formed a distinct phylogenetic lineage within the order Hyphomicrobiales, separating them from members of all families. Strain L72T showed 70.7% average nucleotide identity and 18.6% digital DNA-DNA hybridization identity with the closely related species Rhodoligotrophos defluvii. Based on the phenotypic, phylogenetic and chemotaxonomic data, a new family Propylenellaceae fam. nov. comprising the genus Propylenella gen. nov. and species Propylenella binzhouense sp. nov. is proposed. The type strain is L72T (=  CCTCC AB 2019081T  =  KCTC 72254T).

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (32070111, 31870105).

Funding

The GenBank accession number for the 16S rRNA gene sequence of Propylenella binzhouense L72T is MK124547. The whole genome shotgun project of strain L72T has been deposited at DDBJ/ENA/GenBank under the accession number SPKJ00000000. The version described in this paper is version SPKJ01000000.

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Author contributions LYL and LQ designed research and project outline. LYL, WF, MD, GXF, GPF and FXY performed isolation, deposition, and identification. LYL, WF, DZJ, ZJD and LQ drafted the manuscript. All authors read and approved the final manuscript.

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Correspondence to Ji-Dong Zou or Qiang Li.

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Liu, YL., Meng, D., Wang, F. et al. Propylenella binzhouense gen. nov., sp. nov. isolated from activated sludge, and proposal of Propylenellaceae fam. nov.. Antonie van Leeuwenhoek 114, 225–233 (2021). https://doi.org/10.1007/s10482-020-01514-2

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