Paracoccus benzoatiresistens sp. nov., a benzoate resistance and selenite reduction bacterium isolated from wetland

IF 1.8 3区 生物学 Q4 MICROBIOLOGY
Weidong Mu, Haoran Liu, Bai Guo, Kaiyue Wang, Jinhua Hu, Jianjun Song, Xiuyun Li, Shuzhen Wei, Aijv Liu, Hongliang Liu
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Abstract

A Gram-stain-negative, aerobic, non-motile, catalase- and oxidase-positive, pale orange, rod-shaped strain EF6T, was isolated from a natural wetland reserve in Hebei province, China. The strain grew at 25–37 °C (optimum, 30 °C), pH 5–9 (optimum, pH 7), and in the presence of 1.0–4.0% (w/v) NaCl (optimum, 2%). A phylogenetic analysis based on 16S rRNA gene sequence revealed that strain EF6T belongs to the genus Paracoccus, and the closest members were Paracoccus shandongensis wg2T with 98.1% similarity, Paracoccus fontiphilus MVW-1 T (97.9%), Paracoccus everestensis S8-55 T (97.7%), Paracoccus subflavus GY0581T (97.6%), Paracoccus sediminis CMB17T (97.3%), Paracoccus caeni MJ17T (97.0%), and Paracoccus angustae E6T (97.0%). The genome size of strain EF6T was 4.88 Mb, and the DNA G + C content was 65.3%. The digital DNA-DNA hybridization, average nucleotide identity, and average amino acid identity values between strain EF6T and the reference strains were all below the threshold limit for species delineation (< 32.8%, < 88.0%, and < 86.7%, respectively). The major fatty acids (≥ 5.0%) were summed feature 8 (86.3%, C18:1 ω6c and/or C18:1 ω7c) and C18:1 (5.0%) and the only isoprenoid quinone was Q-10. The polar lipids consisted of diphosphatidylglycerol, phosphatidylglycerol, two unidentified glycolipids, five unidentified phospholipids, and an unidentified aminolipid. Strain EF6T displays notable resistance to benzoate and selenite, with higher tolerance levels (25 g/L for benzoate and 150 mM for selenite) compared to the closely related species. Genomic analysis identified six benzoate resistance genes (acdA, pcaF, fadA, pcaC, purB, and catA) and twenty selenite resistance and reduction-related genes (iscR, ssuB, ssuD, selA, selD and so on). Additionally, EF6T possesses unique genes (catA, ssuB, and ssuC) absent in the closely related species for benzoate and selenite resistance. Its robust resistance to benzoate and selenite, coupled with its genomic makeup, make EF6T a promising candidate for the remediation of both organic and inorganic pollutants. It is worth noting that the specific resistance phenotypes described above were not reported in other novel species in Paracoccus. Based on the results of biochemical, physiological, phylogenetic, and chemotaxonomic analyses, combined with comparisons of the 16S rRNA gene sequence and the whole genome sequence, strain EF6T is considered to represent a novel species of the genus Paracoccus within the family Rhodobacteraceae, for which the name Paracoccus benzoatiresistens sp. nov. is proposed. The type strain is EF6T (= GDMCC 1.3400 T = JCM 35642 T = MCCC 1K08702T).

Abstract Image

Abstract Image

从湿地分离出的抗苯甲酸盐和亚硒酸盐还原细菌 Paracoccus benzoatiresistens sp.
从中国河北省的一个天然湿地保护区中分离出了一株革兰氏染色阴性、需氧、无运动性、催化酶和氧化酶阳性、淡橙色、杆状的 EF6T 菌株。该菌株的生长温度为 25-37℃(最适温度为 30℃),pH 值为 5-9(最适 pH 值为 7),NaCl 含量为 1.0-4.0%(w/v)(最适浓度为 2%)。基于 16S rRNA 基因序列的系统进化分析表明,菌株 EF6T 属于 Paracoccus 属,最接近的成员为山东 Paracoccus wg2T(相似度为 98.1%)、Paracoccus fontiliphus MVW-1 T(97.9%)、Paracoccus everestensis S8-55 T(97.7%)、Paracoccus subflavus GY0581T(97.6%)、Paracoccus sediminis CMB17T(97.3%)、Paracoccus caeni MJ17T(97.0%)和 Paracoccus angustae E6T(97.0%)。菌株 EF6T 的基因组大小为 4.88 Mb,DNA G + C 含量为 65.3%。EF6T菌株与参考菌株之间的数字DNA-DNA杂交、平均核苷酸同一性和平均氨基酸同一性值均低于物种划分的阈值(18:1 ω6c和/或C18:1 ω7c)和C18:1(5.0%),唯一的异戊烯醌是Q-10。极性脂质包括二磷脂酰甘油、磷脂酰甘油、两种不明糖脂、五种不明磷脂和一种不明氨基脂质。菌株 EF6T 对苯甲酸盐和亚硒酸盐具有显著的抗性,与近缘物种相比,耐受水平更高(苯甲酸盐为 25 克/升,亚硒酸盐为 150 毫摩尔)。基因组分析发现了 6 个苯甲酸盐抗性基因(acdA、pcaF、fadA、pcaC、purB 和 catA)和 20 个亚硒酸盐抗性和还原相关基因(iscR、suB、suD、selA、selD 等)。此外,EF6T 还具有近缘物种所没有的独特的抗苯甲酸盐和亚硒酸盐基因(catA、ssuB 和 ssuC)。EF6T 对苯甲酸盐和亚硒酸盐具有很强的抗性,再加上其基因组构成,使其有望成为修复有机和无机污染物的候选基因。值得注意的是,上述特定的抗性表型在 Paracoccus 的其他新物种中未见报道。根据生化、生理、系统发育和化学分类学分析的结果,结合 16S rRNA 基因序列和全基因组序列的比较,认为 EF6T 菌株代表了罗杆菌科 Paracoccus 属的一个新物种,并将其命名为 Paracoccus benzoatiresistens sp.模式菌株为 EF6T(= GDMCC 1.3400 T = JCM 35642 T = MCCC 1K08702T)。
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来源期刊
CiteScore
5.60
自引率
11.50%
发文量
104
审稿时长
3 months
期刊介绍: Antonie van Leeuwenhoek publishes papers on fundamental and applied aspects of microbiology. Topics of particular interest include: taxonomy, structure & development; biochemistry & molecular biology; physiology & metabolic studies; genetics; ecological studies; especially molecular ecology; marine microbiology; medical microbiology; molecular biological aspects of microbial pathogenesis and bioinformatics.
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