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Liu Z, Liu G, Guo X, Li Y, Ji N, Xu X, Sun Q, Yang J. Diversity of the protease-producing bacteria and their extracellular protease in the coastal mudflat of Jiaozhou Bay, China: in response to clam naturally growing and aquaculture. Front Microbiol 2023; 14:1164937. [PMID: 37275176 PMCID: PMC10236810 DOI: 10.3389/fmicb.2023.1164937] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2023] [Accepted: 04/24/2023] [Indexed: 06/07/2023] Open
Abstract
The booming mudflat aquaculture poses an accumulation of organic matter and a certain environmental threat. Protease-producing bacteria are key players in regulating the nitrogen content in ecosystems. However, knowledge of the diversity of protease-producing bacteria in coastal mudflats is limited. This study investigated the bacterial diversity in the coastal mudflat, especially protease-producing bacteria and their extracellular proteases, by using culture-independent methods and culture-dependent methods. The clam aquaculture area exhibited a higher concentration of carbon, nitrogen, and phosphorus when compared with the non-clam area, and a lower richness and diversity of bacterial community when compared with the clam naturally growing area. The major classes in the coastal mud samples were Bacteroidia, Gammaproteobacteria, and Alphaproteobacteria. The Bacillus-like bacterial community was the dominant cultivated protease-producing group, accounting for 52.94% in the non-clam area, 30.77% in the clam naturally growing area, and 50% in the clam aquaculture area, respectively. Additionally, serine protease and metalloprotease were the principal extracellular protease of the isolated coastal bacteria. These findings shed light on the understanding of the microbes involved in organic nitrogen degradation in coastal mudflats and lays a foundation for the development of novel protease-producing bacterial agents for coastal mudflat purification.
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Affiliation(s)
- Zhiyun Liu
- College of Food Science and Engineering, Qingdao Agricultural University, Qingdao, China
| | - Guangchao Liu
- College of Life Science, Qingdao Agricultural University, Qingdao, China
| | - Xuzhen Guo
- College of Food Science and Engineering, Qingdao Agricultural University, Qingdao, China
| | - Yang Li
- College of Food Science and Engineering, Qingdao Agricultural University, Qingdao, China
- Qingdao Special Food Research Institute, Qingdao, China
| | - Na Ji
- College of Food Science and Engineering, Qingdao Agricultural University, Qingdao, China
- Qingdao Special Food Research Institute, Qingdao, China
| | - Xingfeng Xu
- College of Food Science and Engineering, Qingdao Agricultural University, Qingdao, China
- Qingdao Special Food Research Institute, Qingdao, China
| | - Qingjie Sun
- College of Food Science and Engineering, Qingdao Agricultural University, Qingdao, China
- Qingdao Special Food Research Institute, Qingdao, China
| | - Jie Yang
- College of Food Science and Engineering, Qingdao Agricultural University, Qingdao, China
- Qingdao Special Food Research Institute, Qingdao, China
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Du J, Zhang Y, Xin D, Xin Y, Zhang J. Antarcticirhabdus aurantiaca gen. nov., sp. nov., isolated from Antarctic gravel soil. Int J Syst Evol Microbiol 2023; 73. [PMID: 37068122 DOI: 10.1099/ijsem.0.005814] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/18/2023] Open
Abstract
Strain R10T was isolated from a gravel soil sample obtained from Deception Island, Antarctica. The isolate was a Gram-stain-negative, strictly aerobic, motile, short-rod-shaped bacterium, and its colonies were orange yellow in colour. Phylogenetic analysis based on 16S rRNA gene sequences indicated that strain R10T belonged to the family Aurantimonadaceae and shared highest sequence similarity with Jiella aquimaris LZB041T (96.3 % sequence similarity), Aurantimonas aggregata R14M6T (96.0 %) and Aureimonas frigidaquae JCM 14755T (96.0 %). Phylogenetic analysis showed that strain R10T affiliated with members of the family Aurantimonadaceae and represented an independent lineage. Growth occurred at 10-37 °C (optimum, 28-32 °C), up to 1.0 % (w/v) NaCl (optimum, 0 %) and pH 5.5-9.0 (optimum, pH 7.0). The major respiratory quinone of strain R10T was Q-10. Its major fatty acids were C18 : 1 ω7c and C16 : 0. The polar lipid profile of strain R10T comprised diphosphatidylglycerol, phosphatidylmonomethylethanolamine, phosphatidylethanolamine, phosphatidylglycerol, two unknown phospholipids and two unknown aminophospholipids. The genome of strain R10T was 5.92 Mbp with a G+C content of 69.1 % based on total genome calculations. Average nucleotide identity (ANI) values between R10T and other related species of the family Aurantimonadaceae were found to be low (ANIm <87.0 %, ANIb <75.0 % and OrthoANIu <77.0 %). Furthermore, digital DNA-DNA hybridization (dDDH) and average amino acid identity (AAI) values between strain R10T and the closely related species ranged from 19.5-20.6% and from 60.6-64.0 %, respectively. Based on the results of our phylogenetic, phenotypic, genotypic and chemotaxonomic analyses, it is concluded that strain R10T represents a novel genus and species of the family Aurantimonadaceae, for which the name Antarcticirhabdus aurantiaca gen. nov., sp. nov. is proposed. The type strain is R10T (=KCTC 72466T=CGMCC 1.17155T).
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Affiliation(s)
- Jie Du
- Key Laboratory of Molecular Medicine and Biotherapy, School of Life Science, Beijing Institute of Technology, Beijing 100081, PR China
| | - Ying Zhang
- Key Laboratory of Molecular Medicine and Biotherapy, School of Life Science, Beijing Institute of Technology, Beijing 100081, PR China
| | - Di Xin
- Key Laboratory of Molecular Medicine and Biotherapy, School of Life Science, Beijing Institute of Technology, Beijing 100081, PR China
| | - Yuhua Xin
- China General Microbiological Culture Collection Center, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, PR China
| | - Jianli Zhang
- Key Laboratory of Molecular Medicine and Biotherapy, School of Life Science, Beijing Institute of Technology, Beijing 100081, PR China
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Fu W, Zheng X, Chen X, Wang W, Liu A, Ji J, Wang G, Guan C. The potential roles of carotenoids in enhancing phytoremediation of bisphenol A contaminated soil by promoting plant physiology and modulating rhizobacterial community of tobacco. CHEMOSPHERE 2023; 316:137807. [PMID: 36634717 DOI: 10.1016/j.chemosphere.2023.137807] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2022] [Revised: 12/31/2022] [Accepted: 01/08/2023] [Indexed: 06/17/2023]
Abstract
The widespread occurrence of bisphenol A (BPA), a typical endocrine-disrupting compound, poses potential threat to ecosystem and public health. Carotenoids are essential natural pigments, playing important roles in photosynthesis and antioxidant defense of plants. This study aimed to verify the value of carotenoids in enhancing plant tolerance to BPA stress and improving phytoremediation efficiency of tobacco (Nicotiana tabacum L.), through exogenous application of β-carotene (a typical carotenoid) and endogenous upregulation of carotenoids by overexpression of β-carotene hydroxylase (chyb) gene in tobacco. The results demonstrated that exogenous applied β-carotene alleviated the toxic effects of BPA exposure (100 mg kg-1) on wild-type (WT) tobacco plants after being cultivated for 40 d, reflecting by the increase of biomass (201.2%), chlorophyll content (27.5%) and the decrease of malondialdehyde (MDA) content (70.7%). Similar with the results of exogenous application of β-carotene, chyb gene overexpressing tobacco showed less phytotoxicity exposed to BPA, through enhancing photosynthetic efficiency (42.1%) and reducing reactive oxygen species (ROS) production (18%). Notably, about 94.8% BPA in contaminated soil was removed under the cultivation of transgenic tobacco for 40 d, however, only 82.7% was removed in that of WT tobacco. Moreover, transgenic tobacco is beneficial for the growth of plant roots, thus upregulating the abundance of bacteria contributing to BPA degradation or soil nutrient cycling (e.g., Proteobacteria, Acidobacteria, Actinobacteria, Sphingomonas and MND1), which might further help to enhance plant growth and improve BPA removal efficiency in soil. This study extended our understanding of the possible mechanisms of carotenoids-involved alleviation of BPA stress in tobacco, providing a novel strategy to improve phytoremediation efficiency of plants in BPA contaminated soil.
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Affiliation(s)
- Wenting Fu
- School of Environmental Science and Engineering, Tianjin University, 92 Weijin Road, Tianjin, 300072, China
| | - Xiaoyan Zheng
- School of Environmental Science and Engineering, Tianjin University, 92 Weijin Road, Tianjin, 300072, China
| | - Xiancao Chen
- School of Environmental Science and Engineering, Tianjin University, 92 Weijin Road, Tianjin, 300072, China
| | - Wenjing Wang
- School of Environmental Science and Engineering, Tianjin University, 92 Weijin Road, Tianjin, 300072, China
| | - Anran Liu
- School of Environmental Science and Engineering, Tianjin University, 92 Weijin Road, Tianjin, 300072, China
| | - Jing Ji
- School of Environmental Science and Engineering, Tianjin University, 92 Weijin Road, Tianjin, 300072, China
| | - Gang Wang
- School of Environmental Science and Engineering, Tianjin University, 92 Weijin Road, Tianjin, 300072, China
| | - Chunfeng Guan
- School of Environmental Science and Engineering, Tianjin University, 92 Weijin Road, Tianjin, 300072, China.
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Liu Y, Zhang Y, Huang Y, Niu J, Huang J, Peng X, Peng F. Spatial and temporal conversion of nitrogen using Arthrobacter sp. 24S4-2, a strain obtained from Antarctica. Front Microbiol 2023; 14:1040201. [PMID: 36876078 PMCID: PMC9975570 DOI: 10.3389/fmicb.2023.1040201] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2022] [Accepted: 01/30/2023] [Indexed: 02/17/2023] Open
Abstract
According to average nucleotide identity (ANI) analysis of the complete genomes, strain 24S4-2 isolated from Antarctica is considered as a potential novel Arthrobacter species. Arthrobacter sp. 24S4-2 could grow and produce ammonium in nitrate or nitrite or even nitrogen free medium. Strain 24S4-2 was discovered to accumulate nitrate/nitrite and subsequently convert nitrate to nitrite intracellularly when incubated in a nitrate/nitrite medium. In nitrogen-free medium, strain 24S4-2 not only reduced the accumulated nitrite for growth, but also secreted ammonia to the extracellular under aerobic condition, which was thought to be linked to nitrite reductase genes nirB, nirD, and nasA by the transcriptome and RT-qPCR analysis. A membrane-like vesicle structure was detected in the cell of strain 24S4-2 by transmission electron microscopy, which was thought to be the site of intracellular nitrogen supply accumulation and conversion. This spatial and temporal conversion process of nitrogen source helps the strain maintain development in the absence of nitrogen supply or a harsh environment, which is part of its adaption strategy to the Antarctic environment. This process may also play an important ecological role, that other bacteria in the environment would benefit from its extracellular nitrogen source secretion and nitrite consumption characteristics.
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Affiliation(s)
- Yixuan Liu
- China Center for Type Culture Collection (CCTCC), College of Life Sciences, Wuhan University, Wuhan, China
| | - Yumin Zhang
- State Key Laboratory of Virology, Wuhan Institute of Virology, Center for Biosafety Mega-Science, Chinese Academy of Sciences, Wuhan, China
| | - Yudi Huang
- China Center for Type Culture Collection (CCTCC), College of Life Sciences, Wuhan University, Wuhan, China
| | - Jingjing Niu
- China Center for Type Culture Collection (CCTCC), College of Life Sciences, Wuhan University, Wuhan, China
| | - Jun Huang
- China Center for Type Culture Collection (CCTCC), College of Life Sciences, Wuhan University, Wuhan, China
| | - Xiaoya Peng
- China Center for Type Culture Collection (CCTCC), College of Life Sciences, Wuhan University, Wuhan, China
| | - Fang Peng
- China Center for Type Culture Collection (CCTCC), College of Life Sciences, Wuhan University, Wuhan, China
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Fu W, Chen X, Zheng X, Liu A, Wang W, Ji J, Wang G, Guan C. Phytoremediation potential, antioxidant response, photosynthetic behavior and rhizosphere bacterial community adaptation of tobacco (Nicotiana tabacum L.) in a bisphenol A-contaminated soil. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:84366-84382. [PMID: 35780263 DOI: 10.1007/s11356-022-21765-y] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2022] [Accepted: 06/27/2022] [Indexed: 06/15/2023]
Abstract
Bisphenol A (BPA) is an emerging organic pollutant, widely distributed and frequently detected in soil in recent years. BPA toxicity is a problem that needs to be solved in terms of both human health and agricultural production. Up to now, the toxic effect of BPA and its mechanism of action on plants, as well as the possibility of using plants to remediate BPA-contaminated soil, remain to be explored. In this study, six treatment groups were set up to evaluate the effects of different concentrations of BPA on the germination and growth of tobacco (Nicotiana tabacum L.) by medium experiments. Furthermore, the representative indexes of photosynthetic and antioxidant system were determined. Meanwhile, tobacco seedlings were cultivated in soil to further explore the effects of BPA on rhizosphere soil enzyme activity and bacterial community structure with or without 100 mg/kg BPA exposure. The enhancement of BPA removal efficiency from soil by phytoremediation using tobacco plants would also be estimated. Our results showed that high doses of BPA in solid medium remarkably inhibited tobacco seedling growth, and its toxicology effect was positively correlated with BPA concentration, while lower BPA exposure (< 20 mg/L) had little limitation on tobacco growth and induced hormesis effect, which was reflected mainly in the increase of root length. In pot experiments, the reducing of chlorophyll content (36.4%) and net photosynthetic rate (41.2%) meant the inhibition of tobacco photosynthetic process due to high concentration of BPA exposure (100 mg/kg) in soil. The increase of H2O2 and O2- content suggested that BPA could destroy the balance of reactive oxygen species (ROS) in plants. However, tobacco plants still presented a high removal efficiency of BPA at the concentration of 100 mg/kg in soil, which could reach to 80% within 30 days. Furthermore, it was indicated that tobacco cultivation changed the structure of rhizosphere soil bacterial communities and the relative abundance of some valuable strains, including Proteobacteria, Acidobacteria and other strains, which might be participated in the BPA removal process. In addition, the tobacco-soil microbial system had the potential to reverse the negative effects caused by BPA through stimulating microorganism associated with soil nutrient cycling. In summary, tobacco is a competitive plant in phytoremediation of BPA-contaminated soil, though the growth of tobacco could be inhibited at high concentration of BPA. Moreover, tobacco might promote the removal efficiency of BPA by regulating the rhizosphere bacteria communities.
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Affiliation(s)
- Wenting Fu
- School of Environmental Science and Engineering, Tianjin University, 92 Weijin Road, Tianjin, 300072, China
| | - Xiancao Chen
- School of Environmental Science and Engineering, Tianjin University, 92 Weijin Road, Tianjin, 300072, China
| | - Xiaoyan Zheng
- School of Environmental Science and Engineering, Tianjin University, 92 Weijin Road, Tianjin, 300072, China
| | - Anran Liu
- School of Environmental Science and Engineering, Tianjin University, 92 Weijin Road, Tianjin, 300072, China
| | - Wenjing Wang
- School of Environmental Science and Engineering, Tianjin University, 92 Weijin Road, Tianjin, 300072, China
| | - Jing Ji
- School of Environmental Science and Engineering, Tianjin University, 92 Weijin Road, Tianjin, 300072, China
| | - Gang Wang
- School of Environmental Science and Engineering, Tianjin University, 92 Weijin Road, Tianjin, 300072, China
| | - Chunfeng Guan
- School of Environmental Science and Engineering, Tianjin University, 92 Weijin Road, Tianjin, 300072, China.
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6
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Liu A, Wang W, Zheng X, Chen X, Fu W, Wang G, Ji J, Jin C, Guan C. Improvement of the Cd and Zn phytoremediation efficiency of rice (Oryza sativa) through the inoculation of a metal-resistant PGPR strain. CHEMOSPHERE 2022; 302:134900. [PMID: 35568210 DOI: 10.1016/j.chemosphere.2022.134900] [Citation(s) in RCA: 30] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2022] [Revised: 05/04/2022] [Accepted: 05/06/2022] [Indexed: 06/15/2023]
Abstract
Cadmium (Cd) and zinc (Zn) in contaminated soil inhibit rice yield and produce toxic effects on human body through rice accumulation. Plant growth promoting rhizobacteria (PGPR) assisted phytoremediation is an effective ecological measure to improve the remediation efficiency of heavy metal contaminated soil. The purpose of this study was to investigate the efficiency of the combination of rice and Cd/Zn-tolerant PGPR strain Bacillus sp. ZC3-2-1 for the remediation of Cd-Zn contaminated soil. Moreover, the effects of inoculations on rhizosphere bacterial communities and ion homeostasis of rice under Cd-Zn exposure will also be explored. The results showed that compared with the treatment without inoculation, ZC3-2-1 decreased the bioavailable Cd and Zn concentrations in soil by 39.3% and 32.0%, respectively, and increase the phytoextraction of Cd2+ and Zn2+ by rice to 48.2% and 8.0%, respectively. This inoculation process significantly increased the rice biomass, resulting that the contents of Cd2+ and Zn2+ per biomass unit of rice didn't change significantly. This fact meant that ZC3-2-1 could improve the phytoremediation efficiency of Cd-Zn contaminated soil by promoting the phytoextraction and immobilization of the metal, while might not affect the crop food safety. Besides, through regulation of the Na+ and Mg2+ concentration in rice, ZC3-2-1 played a positive role in maintaining ion homeostasis which was disrupted by Zn or Cd. Moreover, ZC3-2-1 could modulate the beneficial bacterial communities in rice rhizosphere soil, and then enhanced Cd-Zn immobilization and enzyme activities in soil, leading to the enhancement of rice growth and phytoremediation efficiency. Above all, this study provided novel insights into developing an efficient phytoremediation system and safe production of rice in Cd-Zn contaminated soil with the application of Bacillus sp. ZC3-2-1, as well as advance our understanding of the principles of rhizosphere bacterial community assemble and maintaining ion homeostasis in rice during this phytoremediation process.
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Affiliation(s)
- Anran Liu
- School of Environmental Science and Engineering, Tianjin University, 92 Weijin Road, Tianjin, 300072, China
| | - Wenjing Wang
- School of Environmental Science and Engineering, Tianjin University, 92 Weijin Road, Tianjin, 300072, China
| | - Xiaoyan Zheng
- School of Environmental Science and Engineering, Tianjin University, 92 Weijin Road, Tianjin, 300072, China
| | - Xiancao Chen
- School of Environmental Science and Engineering, Tianjin University, 92 Weijin Road, Tianjin, 300072, China
| | - Wenting Fu
- School of Environmental Science and Engineering, Tianjin University, 92 Weijin Road, Tianjin, 300072, China
| | - Gang Wang
- School of Environmental Science and Engineering, Tianjin University, 92 Weijin Road, Tianjin, 300072, China
| | - Jing Ji
- School of Environmental Science and Engineering, Tianjin University, 92 Weijin Road, Tianjin, 300072, China
| | - Chao Jin
- School of Environmental Science and Engineering, Tianjin University, 92 Weijin Road, Tianjin, 300072, China
| | - Chunfeng Guan
- School of Environmental Science and Engineering, Tianjin University, 92 Weijin Road, Tianjin, 300072, China.
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Rios P, Bezus B, Cavalitto S, Cavello I. Production and characterization of a new detergent-stable keratinase expressed by Pedobacter sp. 3.14.7, a novel Antarctic psychrotolerant keratin-degrading bacterium. J Genet Eng Biotechnol 2022; 20:81. [PMID: 35612674 PMCID: PMC9133294 DOI: 10.1186/s43141-022-00356-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2022] [Accepted: 05/02/2022] [Indexed: 11/10/2022]
Abstract
BACKGROUND Antarctica is one of the harshest environments in the world. Despite this fact, it has been colonized by microorganisms, which had to develop different adaptations in order to survive. By studying their enzymes, we can harness these adaptations in order to use them in various industrial processes. Keratinases (E.C. 3.4.99.11) are characterized by their robustness in withstanding extreme conditions and, along with other enzymes, are commonly added to laundry detergents, which makes their study of industrial interest. RESULTS In this work, a novel keratinase producer, Pedobacter sp. 3.14.7 (MF 347939.1), isolated from Antarctic birds' nests, was identified. This psychrotolerant isolate displays a typical psychrotolerant growth pattern, with an optimal temperature of 20 °C (μmax=0.23 h-1). After 238 h, maximum proteolytic (22.00 ± 1.17 U ml-1) and keratinolytic (33.04 ± 1.09 U ml-1) activities were achieved with a feather sample conversion of approximately 85%. The keratinase present in crude extract was characterized as a metalloprotease with a molecular weight of 25 kDa, stable in a wide range of pH, with an optimum pH of 7.5. Optimum temperature was 55 °C. Wash performance at 20 °C using this crude extract could remove completely blood stain from cotton cloth. CONCLUSION We report a new keratinolytic bacteria from maritime Antarctica. Among its biochemical characteristics, its stability in the presence of different detergents and bleaching agents and its wash performance showed promising results regarding its potential use as a laundry detergent additive.
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Affiliation(s)
- P Rios
- Centro de Investigación y Desarrollo en Fermentaciones Industriales, Facultad de Ciencias Exactas (CINDEFI, CCT La Plata-CONICET, UNLP), Universidad Nacional de la Plata, Calle 47 y 115, (B1900ASH), 1900, La Plata, Argentina
| | - B Bezus
- Centro de Investigación y Desarrollo en Fermentaciones Industriales, Facultad de Ciencias Exactas (CINDEFI, CCT La Plata-CONICET, UNLP), Universidad Nacional de la Plata, Calle 47 y 115, (B1900ASH), 1900, La Plata, Argentina
| | - S Cavalitto
- Centro de Investigación y Desarrollo en Fermentaciones Industriales, Facultad de Ciencias Exactas (CINDEFI, CCT La Plata-CONICET, UNLP), Universidad Nacional de la Plata, Calle 47 y 115, (B1900ASH), 1900, La Plata, Argentina
| | - I Cavello
- Centro de Investigación y Desarrollo en Fermentaciones Industriales, Facultad de Ciencias Exactas (CINDEFI, CCT La Plata-CONICET, UNLP), Universidad Nacional de la Plata, Calle 47 y 115, (B1900ASH), 1900, La Plata, Argentina.
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Chen Y, Zhang H, Ping W, Zhu L, Xin Y, Zhang J. Pseudarthrobacter albicanus sp. nov., isolated from Antarctic soil. Int J Syst Evol Microbiol 2022; 72. [DOI: 10.1099/ijsem.0.005182] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
A Gram-stain positive, strictly aerobic, non-motile and rod-shaped strain, NJ-Z5T, was isolated from a soil sample obtained from the Antarctic Peninsula. This strain was taxonomically characterized by a polyphasic approach. Phylogenetic analysis based on 16S rRNA gene sequences indicated that strain NJ-Z5T belonged to the genus
Pseudarthrobacter
and showed the highest similarities to
Pseudarthrobacter sulfonivorans
ALLT (98.07%), followed by
Pseudarthrobacter siccitolerans
4J27T (98.00%),
Pseudarthrobacter phenanthrenivorans
Sphe3T (97.93%) and
Pseudarthrobacter psychrotolerans
YJ56T (97.82%). The strain was able to grow at 4–28 °C (optimum, 25 °C), at pH 6.0–8.0 (optimum, pH 7.0) and with 0–1.0% (w/v) NaCl (optimum, 0%). It had catalase activity but no oxidase activity. The chemotaxonomic characteristics of strain NJ-Z5T, which had MK-9 (H2) as its predominant menaquinone and anteiso-C15:0 (58.5%), anteiso-C17:0 (9.9%) and iso-C16:0 (7.0%) as its major fatty acids, were consistent with classification in the genus
Pseudarthrobacter
. The polar lipid profile of strain NJ-Z5T comprised phosphatidylinositol, diphosphatidylglycerol, phosphatidylglycerol, three unidentified glycolipids and two unidentified phospholipids. The genome of strain NJ-Z5T was 4.57 Mbp with a G+C content of 67.1 mol%. Average nucleotide identity (ANI) values between strain NJ-Z5T and other species of the genus
Pseudarthrobacter
were found to be low (ANIm <86%, ANIb <80% and OrthoANIu <80 %). Furthermore, digital DNA–DNA hybridization (dDDH) and average amino acid identity (AAI) values between strain NJ-Z5T and the closely related species ranged from 22.7 to 24.0% and from 75.5 to 77.2%, respectively. On the basis of its differential physiological properties, chemotaxonomic characteristics and low ANI, dDDH and AAI results, strain NJ-Z5T is considered to represent a novel species within the genus
Pseudarthrobacter
, for which the name Pseudarthrobacter albicanus sp. nov. is proposed. The type strain is NJ-Z5T (=CGMCC 1.15636T=KCTC 39722T).
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Affiliation(s)
- Ya Chen
- Key Laboratory of Molecular Medicine and Biotherapy, School of Life Science, Beijing Institute of Technology, Beijing 100081, PR China
| | - Hao Zhang
- Key Laboratory of Molecular Medicine and Biotherapy, School of Life Science, Beijing Institute of Technology, Beijing 100081, PR China
| | - Weiwei Ping
- Key Laboratory of Molecular Medicine and Biotherapy, School of Life Science, Beijing Institute of Technology, Beijing 100081, PR China
| | - Lin Zhu
- Key Laboratory of Molecular Medicine and Biotherapy, School of Life Science, Beijing Institute of Technology, Beijing 100081, PR China
| | - Yuhua Xin
- China General Microbiological Culture Collection Center, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, PR China
| | - Jianli Zhang
- Key Laboratory of Molecular Medicine and Biotherapy, School of Life Science, Beijing Institute of Technology, Beijing 100081, PR China
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Liu X, Zhou M, Xing S, Wu T, He H, Bielicki JK, Chen J. Identification and Biochemical Characterization of a Novel Hormone-Sensitive Lipase Family Esterase Est19 from the Antarctic Bacterium Pseudomonas sp. E2-15. Biomolecules 2021; 11:1552. [PMID: 34827549 PMCID: PMC8615396 DOI: 10.3390/biom11111552] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2021] [Revised: 10/18/2021] [Accepted: 10/19/2021] [Indexed: 02/07/2023] Open
Abstract
Esterases represent an important class of enzymes with a wide variety of industrial applications. A novel hormone-sensitive lipase (HSL) family esterase, Est19, from the Antarctic bacterium Pseudomonas sp. E2-15 is identified, cloned, and expressed. The enzyme possesses a GESAG motif containing an active serine (S) located within a highly conserved catalytic triad of Ser155, Asp253, and His282 residues. The catalytic efficiency (kcat/Km) of Est19 for the pNPC6 substrate is 148.68 s-1mM-1 at 40 °C. Replacing Glu154 juxtaposed to the critical catalytic serine with Asp (E154→D substitution) reduced the activity and catalytic efficiency of the enzyme two-fold, with little change in the substrate affinity. The wild-type enzyme retained near complete activity over a temperature range of 10-60 °C, while ~50% of its activity was retained at 0 °C. A phylogenetic analysis suggested that Est19 and its homologs may represent a new subfamily of HSL. The thermal stability and stereo-specificity suggest that the Est19 esterase may be useful for cold and chiral catalyses.
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Affiliation(s)
- Xiaoyu Liu
- School of Chemistry and Chemical Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China; (X.L.); (S.X.); (T.W.)
| | - Mingyang Zhou
- School of Chemistry and Chemical Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China; (X.L.); (S.X.); (T.W.)
| | - Shu Xing
- School of Chemistry and Chemical Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China; (X.L.); (S.X.); (T.W.)
| | - Tao Wu
- School of Chemistry and Chemical Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China; (X.L.); (S.X.); (T.W.)
| | - Hailun He
- State Key Laboratory of Medical Genetics, School of Life Sciences, Central South University, Changsha 410013, China;
| | | | - Jianbin Chen
- School of Chemistry and Chemical Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China; (X.L.); (S.X.); (T.W.)
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