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Fan M, Tan S, Wang W, Zhang X. Improvement in Salt Tolerance Ability of Pseudomonas putida KT2440. BIOLOGY 2024; 13:404. [PMID: 38927284 PMCID: PMC11200750 DOI: 10.3390/biology13060404] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2024] [Revised: 05/25/2024] [Accepted: 05/29/2024] [Indexed: 06/28/2024]
Abstract
Pseudomonas putida KT2440 is a popular platform for bioremediation due to its robust tolerance to environmental stress and strong biodegradation capacity. Limited research on the salt tolerance of P. putida KT2440 has hindered its application. In this study, the strain KT2440 was tested to tolerate a maximum of 4% w/v NaCl cultured with minimal salts medium. Transcriptomic data in a high-salinity environment showed significant expression changes in genes in membrane components, redox processes, chemotaxis, and cellular catabolic processes. betB-encoding betaine-aldehyde dehydrogenase was identified from the transcriptome data to overexpress and enhance growth profile of the strain KT2440 in minimal salts medium containing 4% w/v NaCl. Meanwhile, screening for exogenous salt-tolerant genes revealed that the Na+/H+ antiporter EcnhaA from Escherichia coli significantly increased the growth of the strain KT2440 in 4% w/v NaCl. Then, co-expression of EcnhaA and betB (KT2440-EcnhaA-betB) increased the maximum salt tolerance of strain KT2440 to 5% w/v NaCl. Further addition of betaine and proline improved the salt tolerance of the engineered strain to 6% w/v NaCl. Finally, the engineered strain KT2440-EcnhaA-betB was able to degrade 56.70% of benzoic acid and 95.64% of protocatechuic acid in minimal salt medium containing 4% w/v NaCl in 48 h, while no biodegradation was observed in the normal strain KT2440 in the same conditions. However, the strain KT2440-EcnhaA-betB failed to degrade catechol in minimal salt medium containing 3% w/v NaCl. This study illustrated the improvement in the salt tolerance performance of Pseudomonas putida KT2440 and the feasibility of engineered strain KT2440 as a potential salt-tolerant bioremediation platform.
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Affiliation(s)
| | | | | | - Xuehong Zhang
- State Key Laboratory of Microbial Metabolism, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200240, China; (M.F.); (S.T.); (W.W.)
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2
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Shao L, Xu T, Zheng X, Shao D, Zhang H, Chen H, Zhang Z, Yan M, Abdel-Motaal H, Jiang J. A novel three-TMH Na +/H + antiporter and the functional role of its oligomerization. J Mol Biol 2020; 433:166730. [PMID: 33279580 DOI: 10.1016/j.jmb.2020.166730] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2020] [Revised: 11/23/2020] [Accepted: 11/30/2020] [Indexed: 12/01/2022]
Abstract
Na+/H+antiportersare a category of ubiquitous transmembrane proteins with various important physiological roles in almost all living organisms ranging from bacteria to humans. However, the knowledge of novel Na+/H+antiporters remains to be broadened, and the functional roles ofoligomerization in theseantiportershave not yet been thoroughly understood. Here, we reported functional analysis of an unknown transmembrane protein composed of 103 amino acid residues. This protein was found to function as a Na+(Li+, K+)/H+ antiporter. To the best of our knowledge, this antiporter is the minimal one of known Na+/H+antiporters and thus designated as NhaM to represent the minimal Na+/H+antiporter. NhaM and its homologs have not yet been classified into any protein family. Based on phylogenetic analysis and protein alignment, we propose NhaM and its homologs to constitute a novel transporter family designated as NhaM family. More importantly, we found that NhaM is assembled with parallel protomers into a homo-oligomer and oligomerization is vital for the function of this antiporter. This implies that NhaM may adopt and require an oligomer structure for its normal function to create a similar X-shaped structure to that of the NhaA fold. Taken together, current findings not only present the proposal of a novel transporter family but also positively contribute to the functional roles of oligomerization in Na+/H+antiporters.
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Affiliation(s)
- Li Shao
- Department of Microbiology and Biotechnology, College of Life Sciences, Northeast Agricultural University, No. 600 Changjiang Road, Xiangfang District, Harbin 150030, China
| | - Tong Xu
- Department of Microbiology and Biotechnology, College of Life Sciences, Northeast Agricultural University, No. 600 Changjiang Road, Xiangfang District, Harbin 150030, China
| | - Xiutao Zheng
- Department of Microbiology and Biotechnology, College of Life Sciences, Northeast Agricultural University, No. 600 Changjiang Road, Xiangfang District, Harbin 150030, China
| | - Dandan Shao
- Department of Microbiology and Biotechnology, College of Life Sciences, Northeast Agricultural University, No. 600 Changjiang Road, Xiangfang District, Harbin 150030, China
| | - Haitao Zhang
- Department of Microbiology and Biotechnology, College of Life Sciences, Northeast Agricultural University, No. 600 Changjiang Road, Xiangfang District, Harbin 150030, China
| | - Huiwen Chen
- Department of Microbiology and Biotechnology, College of Life Sciences, Northeast Agricultural University, No. 600 Changjiang Road, Xiangfang District, Harbin 150030, China
| | - Zhenglai Zhang
- Department of Microbiology and Biotechnology, College of Life Sciences, Northeast Agricultural University, No. 600 Changjiang Road, Xiangfang District, Harbin 150030, China
| | - Mingxue Yan
- Department of Microbiology and Biotechnology, College of Life Sciences, Northeast Agricultural University, No. 600 Changjiang Road, Xiangfang District, Harbin 150030, China
| | - Heba Abdel-Motaal
- Department of Microbiology and Biotechnology, College of Life Sciences, Northeast Agricultural University, No. 600 Changjiang Road, Xiangfang District, Harbin 150030, China
| | - Juquan Jiang
- Department of Microbiology and Biotechnology, College of Life Sciences, Northeast Agricultural University, No. 600 Changjiang Road, Xiangfang District, Harbin 150030, China.
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3
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Stress-tolerant non-conventional microbes enable next-generation chemical biosynthesis. Nat Chem Biol 2020; 16:113-121. [DOI: 10.1038/s41589-019-0452-x] [Citation(s) in RCA: 45] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2019] [Accepted: 12/11/2019] [Indexed: 12/13/2022]
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4
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Abdel-Motaal H, Meng L, Zhang Z, Abdelazez AH, Shao L, Xu T, Meng F, Abozaed S, Zhang R, Jiang J. An Uncharacterized Major Facilitator Superfamily Transporter From Planococcus maritimus Exhibits Dual Functions as a Na +(Li +, K +)/H + Antiporter and a Multidrug Efflux Pump. Front Microbiol 2018; 9:1601. [PMID: 30061877 PMCID: PMC6055358 DOI: 10.3389/fmicb.2018.01601] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2018] [Accepted: 06/27/2018] [Indexed: 02/01/2023] Open
Abstract
Within major facilitator superfamily (MFS), up to 27 unknown major facilitator families and many members of 60 well-characterized families have been functionally unknown as yet, due to their sharing no or significantly low sequence identity with characterized MFS members. Here we present the first report on the characterization of one functionally unknown MFS transporter designated MdrP with the accession version No. ANU18183.1 from the slight halophile Planococcus maritimus DS 17275T. During the screening of Na+/H+ antiporter genes, we found at first that MdrP exhibits Na+(Li+, K+)/H+ antiport activity, and propose that it should represent a novel class of Na+(Li+, K+)/H+ antiporters. However, we speculate that MdrP may possess an additional protein function. The existence of the signature Motif A of drug/H+antiporter (DHA) family members and phylogenetic analysis suggest that MdrP may also function as a drug efflux pump, which was established by minimum inhibitory concentration tests and drug efflux activity assays. Taken together, this novel MFS transporter exhibits dual functions as a Na+(Li+, K+)/H+ antiporter and a multidrug efflux pump, which will be very helpful to not only positively contribute to the function prediction of uncharacterized MFS members especially DHA1 family ones, but also broaden the knowledge of Na+/H+ antiporters.
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Affiliation(s)
- Heba Abdel-Motaal
- Key Laboratory of Agricultural Microbiology of Heilongjiang Province, and Department of Microbiology and Biotechnology, College of Life Sciences, Northeast Agricultural University, Harbin, China.,Department of Microbiology, Agriculture Research Center, Soils, Water, Environment and Microbiology Research Institute, Giza, Egypt
| | - Lin Meng
- Key Laboratory of Agricultural Microbiology of Heilongjiang Province, and Department of Microbiology and Biotechnology, College of Life Sciences, Northeast Agricultural University, Harbin, China
| | - Zhenglai Zhang
- Key Laboratory of Agricultural Microbiology of Heilongjiang Province, and Department of Microbiology and Biotechnology, College of Life Sciences, Northeast Agricultural University, Harbin, China
| | - Amro H Abdelazez
- Key Laboratory of Agricultural Microbiology of Heilongjiang Province, and Department of Microbiology and Biotechnology, College of Life Sciences, Northeast Agricultural University, Harbin, China
| | - Li Shao
- Key Laboratory of Agricultural Microbiology of Heilongjiang Province, and Department of Microbiology and Biotechnology, College of Life Sciences, Northeast Agricultural University, Harbin, China
| | - Tong Xu
- Key Laboratory of Agricultural Microbiology of Heilongjiang Province, and Department of Microbiology and Biotechnology, College of Life Sciences, Northeast Agricultural University, Harbin, China
| | - Fankui Meng
- Key Laboratory of Agricultural Microbiology of Heilongjiang Province, and Department of Microbiology and Biotechnology, College of Life Sciences, Northeast Agricultural University, Harbin, China
| | - Shaima Abozaed
- Department of Microbiology, Agriculture Research Center, Soils, Water, Environment and Microbiology Research Institute, Giza, Egypt
| | - Rui Zhang
- Key Laboratory of Agricultural Microbiology of Heilongjiang Province, and Department of Microbiology and Biotechnology, College of Life Sciences, Northeast Agricultural University, Harbin, China
| | - Juquan Jiang
- Key Laboratory of Agricultural Microbiology of Heilongjiang Province, and Department of Microbiology and Biotechnology, College of Life Sciences, Northeast Agricultural University, Harbin, China
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Shao L, Abdel-Motaal H, Chen J, Chen H, Xu T, Meng L, Zhang Z, Meng F, Jiang J. Characterization of a Functionally Unknown Arginine-Aspartate-Aspartate Family Protein From Halobacillus andaensis and Functional Analysis of Its Conserved Arginine/Aspartate Residues. Front Microbiol 2018; 9:807. [PMID: 29922240 PMCID: PMC5996927 DOI: 10.3389/fmicb.2018.00807] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2018] [Accepted: 04/10/2018] [Indexed: 01/15/2023] Open
Abstract
Arginine–aspartate–aspartate (RDD) family, representing a category of transmembrane proteins containing one highly conserved arginine and two highly conserved aspartates, has been functionally uncharacterized as yet. Here we present the characterization of a member of this family designated RDD from the moderate halophile Halobacillus andaensis NEAU-ST10-40T and report for the first time that RDD should function as a novel Na+(Li+, K+)/H+ antiporter. It’s more interesting whether the highly conserved arginine/aspartate residues among the whole family or between RDD and its selected homologs are related to the protein function. Therefore, we analyzed their roles in the cation-transporting activity through site-directed mutagenesis and found that D154, R124, R129, and D158 are indispensable for Na+(Li+, K+)/H+ antiport activity whereas neither R35 nor D42 is involved in Na+(Li+, K+)/H+ antiport activity. As a dual representative of Na+(Li+, K+)/H+ antiporters and RDD family proteins, the characterization of RDD and the analysis of its important residues will positively contribute to the knowledge of the cation-transporting mechanisms of this novel antiporter and the roles of highly conserved arginine/aspartate residues in the functions of RDD family proteins.
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Affiliation(s)
- Li Shao
- Department of Microbiology and Biotechnology, College of Life Sciences, Northeast Agricultural University, Harbin, China
| | - Heba Abdel-Motaal
- Department of Microbiology and Biotechnology, College of Life Sciences, Northeast Agricultural University, Harbin, China
| | - Jin Chen
- Department of Microbiology and Biotechnology, College of Life Sciences, Northeast Agricultural University, Harbin, China
| | - Huiwen Chen
- Department of Microbiology and Biotechnology, College of Life Sciences, Northeast Agricultural University, Harbin, China
| | - Tong Xu
- Department of Microbiology and Biotechnology, College of Life Sciences, Northeast Agricultural University, Harbin, China
| | - Lin Meng
- Department of Microbiology and Biotechnology, College of Life Sciences, Northeast Agricultural University, Harbin, China
| | - Zhenglai Zhang
- Department of Microbiology and Biotechnology, College of Life Sciences, Northeast Agricultural University, Harbin, China
| | - Fankui Meng
- Department of Microbiology and Biotechnology, College of Life Sciences, Northeast Agricultural University, Harbin, China
| | - Juquan Jiang
- Department of Microbiology and Biotechnology, College of Life Sciences, Northeast Agricultural University, Harbin, China
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Wang Y, Song N, Yang L, Abdel-motaal H, Zhang R, Zhang Z, Meng F, Jiang J. A novel NhaD-type Na+/H+ antiporter from the moderate halophile and alkaliphile Halomonas alkaliphila. Can J Microbiol 2017; 63:596-607. [DOI: 10.1139/cjm-2017-0104] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
In this study, a NhaD-type Na+/H+ antiporter gene designated Ha-nhaD was obtained by selection of genomic DNA from the moderate halophile and alkaliphile Halomonas alkaliphila in Escherichia coli KNabc lacking 3 major Na+/H+ antiporters. The presence of Ha-NhaD conferred tolerance of E. coli KNabc to NaCl up to 0.6 mol·L–1 and to LiCl up to 0.2 mol·L–1 and to an alkaline pH. pH-dependent Na+(Li+)/H+ antiport activity was detected from everted membrane vesicles prepared from E. coli KNabc/pUC-nhaD but not those of KNabc/pUC18. Ha-NhaD exhibited Na+(Li+)/H+ antiport activity over a wide pH range from 7.0 to 9.5, with the highest activity at pH 9.0. Protein sequence alignment and phylogenetic analysis revealed that Ha-NhaD is significantly different from the 7 known NhaD-type Na+/H+ antiporters, including Dw-NhaD, Dl-NhaD, Vp-NhaD, Vc-NhaD, Aa-NhaD, He-NhaD, and Ha-NhaD1. Although Ha-NhaD showed a closer phylogenetic relationship with Ha-NhaD2, a significant difference in pH-dependent activity profile exists between Ha-NhaD and Ha-NhaD2. Taken together, Ha-nhaD encodes a novel pH-dependent NhaD-type Na+/H+ antiporter.
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Affiliation(s)
- Yanhong Wang
- Department of Microbiology and Biotechnology, College of Life Sciences, Northeast Agricultural University, Harbin, 150030, People’s Republic of China
- College of Life Science and Technology, Heilongjiang Bayi Agricultural University, Daqing, 163319, People’s Republic of China
| | - Na Song
- Department of Microbiology and Biotechnology, College of Life Sciences, Northeast Agricultural University, Harbin, 150030, People’s Republic of China
| | - Lina Yang
- Department of Microbiology and Biotechnology, College of Life Sciences, Northeast Agricultural University, Harbin, 150030, People’s Republic of China
| | - Heba Abdel-motaal
- Department of Microbiology and Biotechnology, College of Life Sciences, Northeast Agricultural University, Harbin, 150030, People’s Republic of China
- Department of Microbiology, Soils, Water & Environment Research Institute, Agriculture Research Center, Egypt
| | - Rui Zhang
- Department of Microbiology and Biotechnology, College of Life Sciences, Northeast Agricultural University, Harbin, 150030, People’s Republic of China
| | - Zhenglai Zhang
- Department of Microbiology and Biotechnology, College of Life Sciences, Northeast Agricultural University, Harbin, 150030, People’s Republic of China
| | - Fankui Meng
- Department of Microbiology and Biotechnology, College of Life Sciences, Northeast Agricultural University, Harbin, 150030, People’s Republic of China
| | - Juquan Jiang
- Department of Microbiology and Biotechnology, College of Life Sciences, Northeast Agricultural University, Harbin, 150030, People’s Republic of China
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Characterization of a novel two-component Na +(Li +, K +)/H + antiporter from Halomonas zhaodongensis. Sci Rep 2017; 7:4221. [PMID: 28652569 PMCID: PMC5484666 DOI: 10.1038/s41598-017-04236-0] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2017] [Accepted: 05/30/2017] [Indexed: 02/01/2023] Open
Abstract
In this study, genomic DNA was screened for novel Na+/H+ antiporter genes from Halomonas zhaodongensis by selection in Escherichia coli KNabc lacking three major Na+/H+ antiporters. Co-expression of two genes designated umpAB, encoding paired homologous unknown membrane proteins belonging to DUF1538 (domain of unknown function with No. 1538) family, were found to confer E. coli KNabc the tolerance to 0.4 M NaCl and 30 mM LiCl, and an alkaline pH resistance at 8.0. Western blot and co-immunoprecipitation establish that UmpAB localize as a hetero-dimer in the cytoplasmic membranes. Functional analysis reveals that UmpAB exhibit pH-dependent Na+(Li+, K+)/H+ antiport activity at a wide pH range of 6.5 to 9.5 with an optimal pH at 9.0. Neither UmpA nor UmpB showed homology with known single-gene or multi-gene Na+/H+ antiporters, or such proteins as ChaA, MdfA, TetA(L), Nap and PsmrAB with Na+/H+ antiport activity. Phylogenetic analysis confirms that UmpAB should belong to DUF1538 family, which are significantly distant with the above-mentioned proteins with Na+/H+ antiport activity. Taken together, we propose that UmpAB represent a novel two-component Na+(Li+, K+)/H+ antiporter. To the best of our knowledge, this is the first report on the functional analysis of unknown membrane proteins belonging to DUF1538 family.
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Dong P, Wang L, Song N, Yang L, Chen J, Yan M, Chen H, Zhang R, Li J, Abdel-Motaal H, Jiang J. A UPF0118 family protein with uncharacterized function from the moderate halophile Halobacillus andaensis represents a novel class of Na +(Li +)/H + antiporter. Sci Rep 2017; 7:45936. [PMID: 28374790 PMCID: PMC5379678 DOI: 10.1038/srep45936] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2017] [Accepted: 03/07/2017] [Indexed: 02/06/2023] Open
Abstract
In this study, genomic DNA was screened from Halobacillus andaensis NEAU-ST10-40T by selection in Escherichia coli KNabc lacking three major Na+/H+ antiporters. One gene designated upf0118 exhibiting Na+(Li+)/H+ antiport activity was finally cloned. Protein alignment showed that UPF0118 shares the highest identity of 81.5% with an unannotated gene encoding a protein with uncharacterized protein function belonging to UPF0118 family from H. kuroshimensis, but shares no identity with all known specific Na+(Li+)/H+ antiporter genes or genes with Na+(Li+)/H+ antiport activity. Growth test, western blot and Na+(Li+)/H+ antiport assay revealed that UPF0118 as a transmembrane protein exhibits pH-dependent Na+(Li+)/H+ antiport activity. Phylogenetic analysis indicated that UPF0118 clustered with all its homologs belonging to UPF0118 family at a wide range of 22–82% identities with the bootstrap value of 92%, which was significantly distant with all known specific single-gene Na+(Li+)/H+ antiporters and single-gene proteins with the Na+(Li+)/H+ antiport activity. Taken together, we propose that UPF0118 should represent a novel class of Na+(Li+)/H+ antiporter. To the best of our knowledge, this is the first report on the functional analysis of a protein with uncharacterized protein function as a representative of UPF0118 family containing the domain of unknown function, DUF20.
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Affiliation(s)
- Ping Dong
- Department of Microbiology and Biotechnology, College of Life Sciences, Northeast Agricultural University, Harbin, 150030, PR China
| | - Lidan Wang
- Department of Microbiology and Biotechnology, College of Life Sciences, Northeast Agricultural University, Harbin, 150030, PR China
| | - Na Song
- Department of Microbiology and Biotechnology, College of Life Sciences, Northeast Agricultural University, Harbin, 150030, PR China
| | - Lina Yang
- Department of Microbiology and Biotechnology, College of Life Sciences, Northeast Agricultural University, Harbin, 150030, PR China
| | - Jin Chen
- Department of Microbiology and Biotechnology, College of Life Sciences, Northeast Agricultural University, Harbin, 150030, PR China
| | - Mingxue Yan
- Department of Microbiology and Biotechnology, College of Life Sciences, Northeast Agricultural University, Harbin, 150030, PR China
| | - Huiwen Chen
- Department of Microbiology and Biotechnology, College of Life Sciences, Northeast Agricultural University, Harbin, 150030, PR China
| | - Rui Zhang
- Department of Microbiology and Biotechnology, College of Life Sciences, Northeast Agricultural University, Harbin, 150030, PR China
| | - Jincheng Li
- Department of Microbiology and Biotechnology, College of Life Sciences, Northeast Agricultural University, Harbin, 150030, PR China
| | - Heba Abdel-Motaal
- Department of Microbiology and Biotechnology, College of Life Sciences, Northeast Agricultural University, Harbin, 150030, PR China
| | - Juquan Jiang
- Department of Microbiology and Biotechnology, College of Life Sciences, Northeast Agricultural University, Harbin, 150030, PR China
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Zhang H, Wang Z, Wang L, Mu R, Zou Z, Yuan K, Wang Y, Wu H, Jiang J, Yang L. Cloning and identification of a novel NhaD-type Na+/H+ antiporter from metagenomic DNA of the halophilic bacteria in soil samples around Daban Salt Lake. Extremophiles 2013; 18:89-98. [PMID: 24297704 DOI: 10.1007/s00792-013-0600-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2013] [Accepted: 11/14/2013] [Indexed: 11/25/2022]
Abstract
In this study, metagenomic DNA was screened for the Na(+)/H(+) antiporter gene from the halophilic bacteria in Daban Salt Lake by selection in Escherichia coli KNabc lacking three major Na(+)/H(+) antiporters. One gene designated as Hb_nhaD encoding a novel NhaD-type Na(+)/H(+) antiporter was finally cloned. The presence of Hb_NhaD conferred tolerance of E. coli KNabc to up to 0.5 M NaCl and 0.2 M LiCl, and an alkaline pH. Hb_NhaD has the highest identity (70.6%) with a putative NhaD-type Na(+)/H(+) antiporter from an uncharacterized Clostridiaceae species, and also has lower identity with known NhaD-type Na(+)/H(+) antiporters from Halomonas elongata (20.8%), Alkalimonas amylolytica (19.0%), Vibrio parahaemolyticus (18.9%) and Vibrio cholerae (18.7 %). pH-dependent Na(+)(Li(+))/H(+) antiport activity was detected from everted membrane vesicles prepared from E. coli KNabc carrying Hb_nhaD. Hb_NhaD exhibited very high Na(+)(Li(+))/H(+) antiport activity over a wide pH range from 6.5 to 9.0 with the highest activity at pH 7.0 which is significantly different from those of the above known NhaD-type Na(+)/H(+) antiporters. Also, the apparent K m values of Hb_NhaD for Na(+) and Li(+) at pH 7.0 were determined to be 1.31 and 2.16, respectively. Based on the above results, we proposed that Hb_NhaD should be categorized as a novel NhaD-type Na(+)/H(+) antiporter.
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Affiliation(s)
- Hua Zhang
- Rubber Research Institute, Chinese Academy of Tropical Agricultural Sciences, and Key Laboratory of Rubber Biology and Genetic Resource Utilization, Ministry of Agriculture, Hainan, 571737, Hainan, People's Republic of China
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Adaptation in Haloalkaliphiles and Natronophilic Bacteria. CELLULAR ORIGIN, LIFE IN EXTREME HABITATS AND ASTROBIOLOGY 2013. [DOI: 10.1007/978-94-007-6488-0_5] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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11
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Jiang J, Wang L, Zhang H, Wu H, Huang H, Yang L. Putative paired small multidrug resistance family proteinsPsmrAB, the homolog of YvdSR, actually function as a novel two-component Na+/H+antiporter. FEMS Microbiol Lett 2012; 338:31-8. [DOI: 10.1111/1574-6968.12008] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2012] [Accepted: 09/12/2012] [Indexed: 12/01/2022] Open
Affiliation(s)
| | - Lei Wang
- Department of Microbiology and Immunology; College of Biological Sciences; China Agricultural University; Key Laboratory of Agro-Microbial Resource and Application; Ministry of Agriculture; Beijing; China
| | - Hua Zhang
- Rubber Research Institute; Chinese Academy of Tropical Agricultural Sciences; Key Laboratory of Rubber Biology and Genetic Resource Utilization; Hainan Province; China
| | - Haiping Wu
- Rubber Research Institute; Chinese Academy of Tropical Agricultural Sciences; Key Laboratory of Rubber Biology and Genetic Resource Utilization; Hainan Province; China
| | - Haipeng Huang
- Department of Microbiology and Biotechnology; Northeast Agricultural University; Key Laboratory of Soybean Biology of Ministry of Education; Harbin; China
| | - Lifu Yang
- Rubber Research Institute; Chinese Academy of Tropical Agricultural Sciences; Key Laboratory of Rubber Biology and Genetic Resource Utilization; Hainan Province; China
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12
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Morino M, Ito M. Functional expression of the multi-subunit type calcium/proton antiporter from Thermomicrobium roseum. FEMS Microbiol Lett 2012; 335:26-30. [PMID: 22774932 DOI: 10.1111/j.1574-6968.2012.02634.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2012] [Revised: 07/03/2012] [Accepted: 07/04/2012] [Indexed: 11/30/2022] Open
Abstract
Multiple resistance and pH adaptation (Mrp) antiporters are widely distributed in various prokaryotes and have been reported to function as a hetero-oligomeric monovalent cation/proton antiporter, which exchanges a cytoplasmic monovalent cation (Na(+), Li(+), and/or K(+)) with extracellular H(+). In many organisms, they are essential for survival in alkaline or saline environments. Here, we report that the Mrp antiporter from the thermophilic gram-negative bacterium, Thermomicrobium roseum, does not catalyze monovalent cation/proton antiport like the Mrp antiporters studied to date, but catalyzes Ca(2+)/H(+) antiport in Escherichia coli membrane vesicles.
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Affiliation(s)
- Masato Morino
- Graduate School of Life Sciences, Toyo University, Oura-gun, Gunma, Japan
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Liu J, Krulwich TA, Hicks DB. Purification of two putative type II NADH dehydrogenases with different substrate specificities from alkaliphilic Bacillus pseudofirmus OF4. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2008; 1777:453-61. [PMID: 18359284 DOI: 10.1016/j.bbabio.2008.02.004] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/08/2008] [Revised: 02/26/2008] [Accepted: 02/27/2008] [Indexed: 11/17/2022]
Abstract
A putative Type II NADH dehydrogenase from Halobacillus dabanensis was recently reported to have Na+/H+ antiport activity (and called Nap), raising the possibility of direct coupling of respiration to antiport-dependent pH homeostasis. This study characterized a homologous type II NADH dehydrogenase of genetically tractable alkaliphilic Bacillus pseudofirmus OF4, in which evidence supports antiport-based pH homeostasis that is mediated entirely by secondary antiport. Two candidate type II NADH dehydrogenase genes with canonical GXGXXG motifs were identified in a draft genome sequence of B. pseudofirmus OF4. The gene product designated NDH-2A exhibited homology to enzymes from Bacillus subtilis and Escherichia coli whereas NDH-2B exhibited homology to the H. dabanensis Nap protein and its alkaliphilic Bacillus halodurans C-125 homologue. The ndh-2A, but not the ndh-2B, gene complemented the growth defect of an NADH dehydrogenase-deficient E. coli mutant. Neither gene conferred Na+-resistance on an antiporter-deficient E. coli strain, nor did they confer Na+/H+ antiport activity in vesicle assays. The purified hexa-histidine-tagged gene products were approximately 50 kDa, contained noncovalently bound FAD and oxidized NADH. They were predominantly cytoplasmic in E. coli, consonant with the absence of antiport activity. The catalytic properties of NDH-2A were more consistent with a major respiratory role than those of NDH-2B.
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Affiliation(s)
- Jun Liu
- Department of Pharmacology and Systems Therapeutics, Mount Sinai School of Medicine, One Gustave L. Levy Place, New York, NY 10029, USA
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