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Boulant E, Cambon E, Vergalli J, Bernard R, Neulat-Ripoll F, Nolent F, Gorgé O, Girleanu M, Favier AL, Leonetti JP, Bolla JM. Tolerance engineering in Deinococcus geothermalis by heterologous efflux pumps. Sci Rep 2021; 11:4280. [PMID: 33608597 PMCID: PMC7896070 DOI: 10.1038/s41598-021-83339-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2020] [Accepted: 01/28/2021] [Indexed: 11/21/2022] Open
Abstract
Producing industrially significant compounds with more environmentally friendly represents a challenging task. The large-scale production of an exogenous molecule in a host microfactory can quickly cause toxic effects, forcing the cell to inhibit production to survive. The key point to counter these toxic effects is to promote a gain of tolerance in the host, for instance, by inducing a constant flux of the neo-synthetized compound out of the producing cells. Efflux pumps are membrane proteins that constitute the most powerful mechanism to release molecules out of cells. We propose here a new biological model, Deinococcus geothermalis, organism known for its ability to survive hostile environment; with the aim of coupling the promising industrial potential of this species with that of heterologous efflux pumps to promote engineering tolerance. In this study, clones of D. geothermalis containing various genes encoding chromosomal heterologous efflux pumps were generated. Resistant recombinants were selected using antibiotic susceptibility tests to screen promising candidates. We then developed a method to determine the efflux efficiency of the best candidate, which contains the gene encoding the MdfA of Salmonella enterica serovar Choleraesuis. We observe 1.6 times more compound in the external medium of the hit recombinant than that of the WT at early incubation time. The data presented here will contribute to better understanding of the parameters required for efficient production in D. geothermalis.
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Affiliation(s)
- Erika Boulant
- Aix Marseille Univ, INSERM, SSA, IRBA, MCT, Marseille, France
- Deinove, Cap Sigma/ZAC Euromédecine II, Grabels, France
| | | | - Julia Vergalli
- Aix Marseille Univ, INSERM, SSA, IRBA, MCT, Marseille, France
| | - Rémi Bernard
- Deinove, Cap Sigma/ZAC Euromédecine II, Grabels, France
- Vilmorin SA, Centre de Recherche de La Costière, Ledenon, France
| | - Fabienne Neulat-Ripoll
- Institut de Recherche Biomédicale des Armées, Département Microbiologie et Maladies Infectieuses, Unité Bactériologie, Brétigny-sur-Orge, France
| | - Flora Nolent
- Institut de Recherche Biomédicale des Armées, Département Microbiologie et Maladies Infectieuses, Unité Bactériologie, Brétigny-sur-Orge, France
| | - Olivier Gorgé
- Institut de Recherche Biomédicale des Armées, Département Microbiologie et Maladies Infectieuses, Unité Bactériologie, Brétigny-sur-Orge, France
| | - Maria Girleanu
- Institut de Recherche Biomédicale des Armées, Département des Plateformes et Recherche Technologique, Unité Imagerie, Brétigny-sur-Orge, France
| | - Anne-Laure Favier
- Institut de Recherche Biomédicale des Armées, Département des Plateformes et Recherche Technologique, Unité Imagerie, Brétigny-sur-Orge, France
| | - Jean-Paul Leonetti
- Deinove, Cap Sigma/ZAC Euromédecine II, Grabels, France
- Institut de Recherche en Infectiologie de Montpellier, UMR 9004-CNRS/UM, Montpellier, France
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Morita Y, Okumura M, Narumi I, Nishida H. Sensitivity of Deinococcus grandis rodZ deletion mutant to calcium ions results in enhanced spheroplast size. AIMS Microbiol 2019; 5:176-185. [PMID: 31384711 PMCID: PMC6642908 DOI: 10.3934/microbiol.2019.2.176] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2019] [Accepted: 06/24/2019] [Indexed: 11/18/2022] Open
Abstract
RodZ is a cytoskeletal protein associated with bacterial cell shape. It is a transmembrane protein located on the plasma membrane, and it binds to another cytoskeletal protein MreB. Deinococcus grandis contains a rodZ homolog. Although D. grandis is rod-shaped, it becomes spherical in shape when the rodZ homolog is disrupted. The rodZ deletion mutant was treated with lysozyme to generate spheroplasts. The spheroplasts enlarged in medium containing calcium chloride and penicillin. The rodZ deletion mutant spheroplasts were more sensitive to calcium ions than wild type. Cell and cytoplasm sizes of enlarged spheroplasts of the rodZ deletion mutant tended to be larger than those of wild type. Thus, disruption of rodZ enhances plasma and outer membrane expansion in D. grandis spheroplasts.
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Affiliation(s)
- Yusuke Morita
- Biotechnology Research Center and Department of Biotechnology, Toyama Prefectural University, 5180 Kurokawa, Imizu, Toyama 939-0398, Japan
| | - Mai Okumura
- Biotechnology Research Center and Department of Biotechnology, Toyama Prefectural University, 5180 Kurokawa, Imizu, Toyama 939-0398, Japan
| | - Issay Narumi
- Radiation Microbiology Laboratory, Department of Life Sciences, Faculty of Life Sciences, Toyo University, 1-1-1 Izumino, Itakura, Gunma 374-0193, Japan
| | - Hiromi Nishida
- Biotechnology Research Center and Department of Biotechnology, Toyama Prefectural University, 5180 Kurokawa, Imizu, Toyama 939-0398, Japan
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Dai S, Jin Y, Li T, Weng Y, Xu X, Zhang G, Li J, Pang R, Tian B, Hua Y. DR1440 is a potential iron efflux protein involved in maintenance of iron homeostasis and resistance of Deinococcus radiodurans to oxidative stress. PLoS One 2018; 13:e0202287. [PMID: 30106993 PMCID: PMC6091924 DOI: 10.1371/journal.pone.0202287] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2018] [Accepted: 07/31/2018] [Indexed: 01/18/2023] Open
Abstract
Iron acquisition by bacteria is well studied, but iron export from bacteria is less understood. Herein, we identified dr1440 with a P-type ATPase motif as a potential exporter of iron from Deinococcus radiodurans, a bacterium known for its extreme resistance to radiation and oxidants. The DR1440 was located in cell membrane as demonstrated by fluorescence labelling analysis. Mutation of dr1440 resulted in cellular accumulation of iron ions, and expression level of dr1440 was up-regulated significantly under iron ion or hydrogen peroxide stress in the wild-type strain, implicating DR1440 as a potential iron efflux protein. The dr1440 mutant displayed higher sensitivity to iron ions and oxidative stresses including hydrogen peroxide, hypochlorous acid, and gamma-ray irradiation compared with the wild-type strain. The high amount of iron in the mutant strain resulted in severe protein carbonylation, suggesting that DR1440 might contribute to intracellular protein protection against reactive oxygen species (ROS) generated from ferrous ion-mediated Fenton-reaction. Mutations of S297A and C299A led to intracellular accumulation of iron, indicating that S297 and C299 might be important functional residues of DR1440. Thus, DR1440 is a potential iron efflux protein involved in iron homeostasis and oxidative stress-resistance of D. radiodurans.
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Affiliation(s)
- Shang Dai
- Key Laboratory for Nuclear-Agricultural Sciences of Chinese Ministry of Agriculture and Zhejiang Province, Institute of Nuclear-Agricultural Sciences, Zhejiang University, Hangzhou, China
| | - Ye Jin
- Key Laboratory for Nuclear-Agricultural Sciences of Chinese Ministry of Agriculture and Zhejiang Province, Institute of Nuclear-Agricultural Sciences, Zhejiang University, Hangzhou, China
| | - Tao Li
- Key Laboratory for Nuclear-Agricultural Sciences of Chinese Ministry of Agriculture and Zhejiang Province, Institute of Nuclear-Agricultural Sciences, Zhejiang University, Hangzhou, China
| | - Yulan Weng
- Key Laboratory for Nuclear-Agricultural Sciences of Chinese Ministry of Agriculture and Zhejiang Province, Institute of Nuclear-Agricultural Sciences, Zhejiang University, Hangzhou, China
| | - Xiaolin Xu
- Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan, School of Chemistry and Chemical Engineering, Shihezi University, Shihezi, Xinjiang, China
| | - Genlin Zhang
- Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan, School of Chemistry and Chemical Engineering, Shihezi University, Shihezi, Xinjiang, China
| | - Jiulong Li
- Key Laboratory for Nuclear-Agricultural Sciences of Chinese Ministry of Agriculture and Zhejiang Province, Institute of Nuclear-Agricultural Sciences, Zhejiang University, Hangzhou, China
| | - Renjiang Pang
- Key Laboratory for Nuclear-Agricultural Sciences of Chinese Ministry of Agriculture and Zhejiang Province, Institute of Nuclear-Agricultural Sciences, Zhejiang University, Hangzhou, China
| | - Bing Tian
- Key Laboratory for Nuclear-Agricultural Sciences of Chinese Ministry of Agriculture and Zhejiang Province, Institute of Nuclear-Agricultural Sciences, Zhejiang University, Hangzhou, China
- * E-mail:
| | - Yuejin Hua
- Key Laboratory for Nuclear-Agricultural Sciences of Chinese Ministry of Agriculture and Zhejiang Province, Institute of Nuclear-Agricultural Sciences, Zhejiang University, Hangzhou, China
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Vishambra D, Srivastava M, Dev K, Jaiswal V. Subcellular localization based comparative study on radioresistant bacteria: A novel approach to mine proteins involve in radioresistance. Comput Biol Chem 2017; 69:1-9. [PMID: 28527408 DOI: 10.1016/j.compbiolchem.2017.05.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2016] [Revised: 03/25/2017] [Accepted: 05/05/2017] [Indexed: 11/16/2022]
Abstract
Radioresistant bacteria (RRB) are among the most radioresistant organisms and has a unique role in evolution. Along with the evolutionary role, radioresistant organisms play important role in paper industries, bioremediation, vaccine development and possibility in anti-aging and anti-cancer treatment. The study of radiation resistance in RRB was mainly focused on cytosolic mechanisms such as DNA repair mechanism, cell cleansing activity and high antioxidant activity. Although it was known that protein localized on outer areas of cell play role in resistance towards extreme condition but the mechanisms/proteins localized on the outer area of cells are not studied for radioresistance. Considering the fact that outer part of cell is more exposed to radiations and proteins present in outer area of the cell may have role in radioresistance. Localization based comparative study of proteome from RRB and non-radio resistant bacteria was carried out. In RRB 20 unique proteins have been identified. Further domain, structural, and pathway analysis of selected proteins were carried out. Out of 20 proteins, 8 proteins were direct involvement in radioresistance and literature study strengthens this, however, 1 proteins had assumed relation in radioresistance. Selected radioresistant proteins may be helpful for optimal use of RRB in industry and health care.
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Affiliation(s)
- Divya Vishambra
- Faculty of Applied Sciences and Biotechnology, Shoolini University, Solan, Himachal Pradesh, India
| | - Malay Srivastava
- Faculty of Applied Sciences and Biotechnology, Shoolini University, Solan, Himachal Pradesh, India
| | - Kamal Dev
- Faculty of Applied Sciences and Biotechnology, Shoolini University, Solan, Himachal Pradesh, India
| | - Varun Jaiswal
- School of Electrical and Computer Science Engineering, Shoolini University, Solan, Himachal Pradesh, India.
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Kim M, Jeong S, Lim S, Sim J, Rhie HG, Lee SJ. Oxidative stress response of Deinococcus geothermalis via a cystine importer. J Microbiol 2017; 55:137-146. [PMID: 28120190 DOI: 10.1007/s12275-017-6382-y] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2016] [Revised: 10/25/2016] [Accepted: 10/26/2016] [Indexed: 11/29/2022]
Abstract
A cystine-dependent anti-oxidative stress response is characterized in Deinococcus geothermalis for the first time. Nevertheless, the same transcriptional directed Δdgeo_1985F mutant strain was revealed to have an identical phenotype to the wild-type strain, while the reverse transcriptional directed Δdgeo_1985R mutant strain was more resistant to oxidative stress at a certain concentration of H2O2 than the wild-type strain. The wild-type and mutant strains expressed equal levels of superoxide dismutase and catalase under H2O2-induced stress. Although the expression levels of the general DNA-damage response-related genes recA, pprA, ddrA, and ddrB were up-regulated by more than five-fold in the wild-type strain relative to the Δdgeo_1985R mutant strain, the mutant strain had a higher survival rate than the wild-type under H2O2 stress. The Δdgeo_1985R mutant strain highly expressed a cystine-transporter gene (dgeo_1986), at levels 150-fold higher than the wild-type strain, leading to the conclusion that this cystine transporter might be involved in the defensive response to H2O2 stress. In this study, the cystine transporter was identified and characterized through membrane protein expression analysis, a cystine-binding assay, and assays of intracellular H2O2, cysteine, and thiol levels. The genedisrupted mutant strain of the cystine importer revealed high sensitivity to H2O2 and less absorbed cystine, resulting in low concentrations of total thiol. Thus, the absorbed cystine via this cystine-specific importer may be converted into cysteine, which acts as a primitive defense substrate that non-enzymatically scavenges oxidative stress agents in D. geothermalis.
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Affiliation(s)
- Minwook Kim
- Department of Biology, Kyung Hee University, Seoul, 02447, Republic of Korea
| | - Sunwook Jeong
- Division of Biotechnology, Korea Atomic Energy Research Institute, Jeongeup, 56212, Republic of Korea
| | - Sangyong Lim
- Division of Biotechnology, Korea Atomic Energy Research Institute, Jeongeup, 56212, Republic of Korea
| | - Jeonggu Sim
- Department of Visual Optics, Baekseok University, Cheonan, 31065, Republic of Korea
| | - Ho-Gun Rhie
- Department of Biology, Kyung Hee University, Seoul, 02447, Republic of Korea
| | - Sung-Jae Lee
- Department of Biology, Kyung Hee University, Seoul, 02447, Republic of Korea. .,Department of Life and Nanopharmaceutical Sciences, Kyung Hee University, Seoul, 02447, Republic of Korea.
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Prakash D, Gabani P, Chandel AK, Ronen Z, Singh OV. Bioremediation: a genuine technology to remediate radionuclides from the environment. Microb Biotechnol 2013; 6:349-60. [PMID: 23617701 PMCID: PMC3917470 DOI: 10.1111/1751-7915.12059] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2012] [Revised: 03/19/2013] [Accepted: 03/25/2013] [Indexed: 12/01/2022] Open
Abstract
Radionuclides in the environment are a major human and environmental health concern. Like the Chernobyl disaster of 1986, the Fukushima Daiichi nuclear disaster in 2011 is once again causing damage to the environment: a large quantity of radioactive waste is being generated and dumped into the environment, and if the general population is exposed to it, may cause serious life-threatening disorders. Bioremediation has been viewed as the ecologically responsible alternative to environmentally destructive physical remediation. Microorganisms carry endogenous genetic, biochemical and physiological properties that make them ideal agents for pollutant remediation in soil and groundwater. Attempts have been made to develop native or genetically engineered (GE) microbes for the remediation of environmental contaminants including radionuclides. Microorganism-mediated bioremediation can affect the solubility, bioavailability and mobility of radionuclides. Therefore, we aim to unveil the microbial-mediated mechanisms for biotransformation of radionuclides under various environmental conditions as developing strategies for waste management of radionuclides. A discussion follows of '-omics'-integrated genomics and proteomics technologies, which can be used to trace the genes and proteins of interest in a given microorganism towards a cell-free bioremediation strategy.
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Affiliation(s)
- Dhan Prakash
- Institute of Microbial Technology (CSIR), Sector 39-A, Chandigarh, 160036, India
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Dedieu A, Sahinovic E, Guérin P, Blanchard L, Fochesato S, Meunier B, de Groot A, Armengaud J. Major soluble proteome changes in Deinococcus deserti over the earliest stages following gamma-ray irradiation. Proteome Sci 2013; 11:3. [PMID: 23320389 PMCID: PMC3564903 DOI: 10.1186/1477-5956-11-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2012] [Accepted: 12/23/2012] [Indexed: 11/10/2022] Open
Abstract
UNLABELLED BACKGROUND Deinococcus deserti VCD115 has been isolated from Sahara surface sand. This radiotolerant bacterium represents an experimental model of choice to understand adaptation to harsh conditions encountered in hot arid deserts. We analysed the soluble proteome dynamics in this environmentally relevant model after exposure to 3 kGy gamma radiation, a non-lethal dose that generates massive DNA damages. For this, cells were harvested at different time lapses after irradiation and their soluble proteome contents have been analysed by 2-DE and mass spectrometry. RESULTS In the first stage of the time course we observed accumulation of DNA damage response protein DdrB (that shows the highest fold change ~11), SSB, and two different RecA proteins (RecAP and RecAC). Induction of DNA repair protein PprA, DNA damage response protein DdrD and the two gyrase subunits (GyrA and GyrB) was also detected. A response regulator of the SarP family, a type II site-specific deoxyribonuclease and a putative N-acetyltransferase are three new proteins found to be induced. In a more delayed stage, we observed accumulation of several proteins related to central metabolism and protein turn-over, as well as helicase UvrD and novel forms of both gyrase subunits differing in terms of isoelectric point and molecular weight. CONCLUSIONS Post-translational modifications of GyrA (N-terminal methionine removal and acetylation) have been evidenced and their significance discussed. We found that the Deide_02842 restriction enzyme, which is specifically found in D. deserti, is a new potential member of the radiation/desiccation response regulon, highlighting the specificities of D. deserti compared to the D. radiodurans model.
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Affiliation(s)
- Alain Dedieu
- Laboratoire de Biochimie des Systèmes Perturbés, CEA Marcoule, DSV, iBEB, SBTN, LBSP, BAGNOLS-SUR-CEZE, F-30207, France.
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Wang H, Wang F, Hua X, Ma T, Chen J, Xu X, Wang L, Tian B, Hua Y. Genetic and biochemical characteristics of the histone-like protein DR0199 in Deinococcus radiodurans. MICROBIOLOGY-SGM 2012; 158:936-943. [PMID: 22282513 DOI: 10.1099/mic.0.053702-0] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Bacterial histone-like proteins are important for nucleoid structure, cell growth, DNA replication, recombination and gene regulation. In this study, we focused on the role of DR0199 (the EbfC orthologue), a newly identified member of the nucleoid-associated protein family in Deinococcus radiodurans. The survival fraction of DR0199-null mutant decreased by tenfold after treatment with 50 mM H(2)O(2), nearly sixfold at a 10 kGy dose of gamma ray and nearly eightfold at a UV exposure of 1000 J m(-2) compared with wild-type cells. The results of fluorescence labelling assays indicated that DR0199 protein localized in the nucleoid area of cells. Electrophoretic mobility shift assays demonstrated that D. radiodurans DR0199 is a DNA-binding protein. Furthermore, DNA protection assays suggested that DR0199 shields DNA from hydroxyl radical- and DNase I-mediated cleavage. The supercoiling of relaxed plasmid DNA in the presence of topoisomerase I revealed that DR0199 constrains DNA supercoils in vitro. Collectively, these findings suggest that DR0199 is a protein with DNA-protective properties and histone-like features that are involved in protecting D. radiodurans DNA from damage.
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Affiliation(s)
- Hu Wang
- Key Laboratory for Nuclear-Agricultural Sciences of Chinese Ministry of Agriculture and Zhejiang Province, Institute of Nuclear-Agricultural Sciences, Zhejiang University, 310029 Hangzhou, PR China
| | - Fei Wang
- Key Laboratory for Nuclear-Agricultural Sciences of Chinese Ministry of Agriculture and Zhejiang Province, Institute of Nuclear-Agricultural Sciences, Zhejiang University, 310029 Hangzhou, PR China
| | - Xiaoting Hua
- Department of Infectious Diseases, Sir Run Run Shaw Hospital, College of Medicine, Zhejiang University, 310016 Hangzhou, PR China
| | - Tingting Ma
- Key Laboratory for Nuclear-Agricultural Sciences of Chinese Ministry of Agriculture and Zhejiang Province, Institute of Nuclear-Agricultural Sciences, Zhejiang University, 310029 Hangzhou, PR China
| | - Jianhui Chen
- Key Laboratory for Nuclear-Agricultural Sciences of Chinese Ministry of Agriculture and Zhejiang Province, Institute of Nuclear-Agricultural Sciences, Zhejiang University, 310029 Hangzhou, PR China
| | - Xin Xu
- Key Laboratory for Nuclear-Agricultural Sciences of Chinese Ministry of Agriculture and Zhejiang Province, Institute of Nuclear-Agricultural Sciences, Zhejiang University, 310029 Hangzhou, PR China
| | - Liangyan Wang
- Key Laboratory for Nuclear-Agricultural Sciences of Chinese Ministry of Agriculture and Zhejiang Province, Institute of Nuclear-Agricultural Sciences, Zhejiang University, 310029 Hangzhou, PR China
| | - Bing Tian
- Key Laboratory for Nuclear-Agricultural Sciences of Chinese Ministry of Agriculture and Zhejiang Province, Institute of Nuclear-Agricultural Sciences, Zhejiang University, 310029 Hangzhou, PR China
| | - Yuejin Hua
- Key Laboratory for Nuclear-Agricultural Sciences of Chinese Ministry of Agriculture and Zhejiang Province, Institute of Nuclear-Agricultural Sciences, Zhejiang University, 310029 Hangzhou, PR China
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Physiology of resistant Deinococcus geothermalis bacterium aerobically cultivated in low-manganese medium. J Bacteriol 2012; 194:1552-61. [PMID: 22228732 DOI: 10.1128/jb.06429-11] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
This dynamic proteome study describes the physiology of growth and survival of Deinococcus geothermalis, in conditions simulating paper machine waters being aerobic, warm, and low in carbon and manganese. The industrial environment of this species differs from its natural habitats, geothermal springs and deep ocean subsurfaces, by being highly exposed to oxygen. Quantitative proteome analysis using two-dimensional gel electrophoresis and bioinformatic tools showed expression change for 165 proteins, from which 47 were assigned to a function. We propose that D. geothermalis grew and survived in aerobic conditions by channeling central carbon metabolism to pathways where mainly NADPH rather than NADH was retrieved from the carbon source. A major part of the carbon substrate was converted into succinate, which was not a fermentation product but likely served combating reactive oxygen species (ROS). Transition from growth to nongrowth resulted in downregulation of the oxidative phosphorylation observed as reduced expression of V-type ATPase responsible for ATP synthesis in D. geothermalis. The battle against oxidative stress was seen as upregulation of superoxide dismutase (Mn dependent) and catalase, as well as several protein repair enzymes, including FeS cluster assembly proteins of the iron-sulfur cluster assembly protein system, peptidylprolyl isomerase, and chaperones. Addition of soluble Mn reinitiated respiration and proliferation with concomitant acidification, indicating that aerobic metabolism was restricted by access to manganese. We conclude that D. geothermalis prefers to combat ROS using manganese-dependent enzymes, but when manganese is not available central carbon metabolism is used to produce ROS neutralizing metabolites at the expense of high utilization of carbon substrate.
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Daware V, Kesavan S, Patil R, Natu A, Kumar A, Kulkarni M, Gade W. Effects of arsenite stress on growth and proteome of Klebsiella pneumoniae. J Biotechnol 2011; 158:8-16. [PMID: 22209886 DOI: 10.1016/j.jbiotec.2011.12.013] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2011] [Revised: 12/05/2011] [Accepted: 12/15/2011] [Indexed: 11/26/2022]
Abstract
In the present study an arsenite, As(III), tolerating bacterium, MR4, was isolated from Mulla River Pune, India, capable of reducing arsenate to arsenite and identified as Klebsiella pneumoniae (HQ857583). Comparative proteomic analysis using two-dimensional gel electrophoresis (2-DGE) and matrix assisted laser desorption ionization-time of flight-time of flight (MALDI-TOF/TOF) was used to monitor the proteins undergoing changes in expression levels under 2.5 mM As(III) stress. The 2-DGE proteome map has shown that 60 proteins were differentially expressed under As(III) stress, of which 39 proteins were successfully identified with a MASCOT score greater than 70 (p<0.05). Among the identified proteins, membrane transport/binding proteins, porins, and amino acid metabolism enzymes were down-regulated while stress responsive proteins and antioxidant enzymes were up-regulated. Proteins involved in carbohydrate metabolism, particularly those in pentose phosphate pathway were also up-regulated while those involved in pyruvate metabolism were down-regulated. However, proteins involved in glycolysis and tricarboxylic acid cycle showed a mixed regulation response. These findings provide new insights into the probable mechanisms by which K. pneumoniae (HQ857583) could be adapting to As(III) stress.
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Affiliation(s)
- Vandana Daware
- Department of Biotechnology, University of Pune, Pune 411007, Maharashtra, India
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Zhang L, Katselis GS, Moore RE, Lekpor K, Goto RM, Lee TD, Miller MM. Proteomic Analysis of Surface and Endosomal Membrane Proteins from the Avian LMH Epithelial Cell Line. J Proteome Res 2011; 10:3973-82. [DOI: 10.1021/pr200179r] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Lei Zhang
- Department of Molecular and Cellular Biology and ‡Department of Immunology, Beckman Research Institute, City of Hope, 1500 E. Duarte Road, Duarte, California 91010-3000, United States
| | - George S. Katselis
- Department of Molecular and Cellular Biology and ‡Department of Immunology, Beckman Research Institute, City of Hope, 1500 E. Duarte Road, Duarte, California 91010-3000, United States
| | - Roger E. Moore
- Department of Molecular and Cellular Biology and ‡Department of Immunology, Beckman Research Institute, City of Hope, 1500 E. Duarte Road, Duarte, California 91010-3000, United States
| | - Kossi Lekpor
- Department of Molecular and Cellular Biology and ‡Department of Immunology, Beckman Research Institute, City of Hope, 1500 E. Duarte Road, Duarte, California 91010-3000, United States
| | - Ronald M. Goto
- Department of Molecular and Cellular Biology and ‡Department of Immunology, Beckman Research Institute, City of Hope, 1500 E. Duarte Road, Duarte, California 91010-3000, United States
| | - Terry D. Lee
- Department of Molecular and Cellular Biology and ‡Department of Immunology, Beckman Research Institute, City of Hope, 1500 E. Duarte Road, Duarte, California 91010-3000, United States
| | - Marcia M. Miller
- Department of Molecular and Cellular Biology and ‡Department of Immunology, Beckman Research Institute, City of Hope, 1500 E. Duarte Road, Duarte, California 91010-3000, United States
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