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Yang X, Yuan J, Yue FJ, Li SL, Wang B, Mohinuzzaman M, Liu Y, Senesi N, Lao X, Li L, Liu CQ, Ellam RM, Vione D, Mostofa KMG. New insights into mechanisms of sunlight- and dark-mediated high-temperature accelerated diurnal production-degradation of fluorescent DOM in lake waters. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 760:143377. [PMID: 33198994 DOI: 10.1016/j.scitotenv.2020.143377] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2020] [Revised: 10/20/2020] [Accepted: 10/21/2020] [Indexed: 06/11/2023]
Abstract
The production of fluorescent dissolved organic matter (FDOM) by phytoplankton and its subsequent degradation, both of which occur constantly under diurnal-day time sunlight and by night time dark-microbial respiration processes in the upper layer of surface waters, influence markedly several biogeochemical processes and functions in aquatic environments and can be feasibly related to global warming (GW). In this work sunlight-mediated high-temperature was shown to accelerate the production of FDOM, but also its complete disappearance over a 24-h diurnal period in July at the highest air and water temperatures (respectively, 41.1 and 33.5 °C), differently from lower temperature months. Extracellular polymeric substances (EPS), an early-state DOM, were produced by phytoplankton in July in the early morning (6:00-9:00), then they were degraded into four FDOM components over midday (10:00-15:00), which was followed by simultaneous production and almost complete degradation of FDOM with reformation of EPS during the night (2:00-6:00). Such transformations occurred simultaneously with the fluctuating production of nutrients, dissolved organic carbon (DOC), dissolved organic nitrogen (DON) and the two isotopes (δ15N and δ18O) of NO3-. It was estimated that complete degradation of FDOM in July was associated with mineralization of approximately 15% of the initial DOC, which showed a nighttime minimum (00:00) in comparison to a maximum at 13:00. FDOM identified by excitation-emission matrix spectroscopy combined with parallel factor analysis consisted of EPS, autochthonous humic-like substances (AHLS) of C- and M-types, a combined form of C- and M-types of AHLS, protein-like substances (PLS), newly-released PLS, tryptophan-like substances, tyrosine-like substances (TYLS), a combined form of TYLS and phenylalanine-like substances (PALS), and their degradation products. Finally, stepwise degradation and production processes are synthesized in a pathway for FDOM components production and their subsequent transformation under different diurnal temperature conditions, which provided a broader paradigm for future impacts on GW-mediated DOM dynamics in lake water.
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Affiliation(s)
- Xuemei Yang
- Institute of Surface-Earth System Science, Tianjin University, 92 Weijin Road, Tianjin 300072, China; Tianjin Key Laboratory of Earth Critical Zone Science and Sustainable Development in Bohai Rim, Tianjin University, 92 Weijin Road, Tianjin 300072, China
| | - Jie Yuan
- Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beitucheng Western Road, Chaoyang District, 100029 Beijing, PR China
| | - Fu-Jun Yue
- Institute of Surface-Earth System Science, Tianjin University, 92 Weijin Road, Tianjin 300072, China; Tianjin Key Laboratory of Earth Critical Zone Science and Sustainable Development in Bohai Rim, Tianjin University, 92 Weijin Road, Tianjin 300072, China
| | - Si-Liang Li
- Institute of Surface-Earth System Science, Tianjin University, 92 Weijin Road, Tianjin 300072, China; Tianjin Key Laboratory of Earth Critical Zone Science and Sustainable Development in Bohai Rim, Tianjin University, 92 Weijin Road, Tianjin 300072, China
| | - Baoli Wang
- Institute of Surface-Earth System Science, Tianjin University, 92 Weijin Road, Tianjin 300072, China; Tianjin Key Laboratory of Earth Critical Zone Science and Sustainable Development in Bohai Rim, Tianjin University, 92 Weijin Road, Tianjin 300072, China
| | - Mohammad Mohinuzzaman
- Institute of Surface-Earth System Science, Tianjin University, 92 Weijin Road, Tianjin 300072, China; Tianjin Key Laboratory of Earth Critical Zone Science and Sustainable Development in Bohai Rim, Tianjin University, 92 Weijin Road, Tianjin 300072, China
| | - Yijun Liu
- Institute of Surface-Earth System Science, Tianjin University, 92 Weijin Road, Tianjin 300072, China; Tianjin Key Laboratory of Earth Critical Zone Science and Sustainable Development in Bohai Rim, Tianjin University, 92 Weijin Road, Tianjin 300072, China
| | - Nicola Senesi
- Dip.to di Scienze del Suolo, della Pianta e degli Alimenti, Università degli Studi di Bari "Aldo Moro", Via G. Amendola 165/A, 70126 Bari, Italy
| | - Xinyu Lao
- Institute of Surface-Earth System Science, Tianjin University, 92 Weijin Road, Tianjin 300072, China; Tianjin Key Laboratory of Earth Critical Zone Science and Sustainable Development in Bohai Rim, Tianjin University, 92 Weijin Road, Tianjin 300072, China
| | - Longlong Li
- Institute of Surface-Earth System Science, Tianjin University, 92 Weijin Road, Tianjin 300072, China; Tianjin Key Laboratory of Earth Critical Zone Science and Sustainable Development in Bohai Rim, Tianjin University, 92 Weijin Road, Tianjin 300072, China
| | - Cong-Qiang Liu
- Institute of Surface-Earth System Science, Tianjin University, 92 Weijin Road, Tianjin 300072, China; Tianjin Key Laboratory of Earth Critical Zone Science and Sustainable Development in Bohai Rim, Tianjin University, 92 Weijin Road, Tianjin 300072, China
| | - Rob M Ellam
- Scottish Universities Environmental Research Centre, Rankine Avenue, Scottish Enterprise Technology Park, East Kilbride G75 0QF, UK; Institute of Surface-Earth System Science, Tianjin University, 92 Weijin Road, Tianjin 300072, China
| | - Davide Vione
- Università degli Studi di Torino, Dipartimento di Chimica, Via P. Giuria 5, 10125 Torino, Italy; Centro Interdipartimentale NatRisk, Via Leonardo da Vinci 44, 10095 Grugliasco, TO, Italy
| | - Khan M G Mostofa
- Institute of Surface-Earth System Science, Tianjin University, 92 Weijin Road, Tianjin 300072, China; Tianjin Key Laboratory of Earth Critical Zone Science and Sustainable Development in Bohai Rim, Tianjin University, 92 Weijin Road, Tianjin 300072, China.
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Orruño M, Parada C, Kaberdin VR, Arana I. The Effect of Visible Light on Cell Envelope Subproteome during Vibrio harveyi Survival at 20 °C in Seawater. Microorganisms 2021; 9:microorganisms9030594. [PMID: 33805730 PMCID: PMC8001661 DOI: 10.3390/microorganisms9030594] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2021] [Revised: 03/10/2021] [Accepted: 03/11/2021] [Indexed: 11/16/2022] Open
Abstract
A number of Vibrio spp. belong to the well-studied model organisms used to understand the strategies developed by marine bacteria to cope with adverse conditions (starvation, suboptimal temperature, solar radiation, etc.) in their natural environments. Temperature and nutrient availability are considered to be the key factors that influence Vibrio harveyi physiology, morphology, and persistence in aquatic systems. In contrast to the well-studied effects of temperature and starvation on Vibrio survival, little is known about the impact of visible light able to cause photooxidative stress. Here we employ V. harveyi ATCC 14126T as a model organism to analyze and compare the survival patterns and changes in the protein composition of its cell envelope during the long-term permanence of this bacterium in seawater microcosm at 20 °C in the presence and absence of illumination with visible light. We found that V. harveyi exposure to visible light reduces cell culturability likely inducing the entry into the Viable but Non Culturable state (VBNC), whereas populations maintained in darkness remained culturable for at least 21 days. Despite these differences, the starved cells in both populations underwent morphological changes by reducing their size. Moreover, further proteomic analysis revealed a number of changes in the composition of cell envelope potentially accountable for the different adaptation pattern manifested in the absence and presence of visible light.
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Affiliation(s)
- Maite Orruño
- Department of Immunology, Microbiology and Parasitology, Faculty of Science and Technology, University of the Basque Country UPV/EHU, 48340 Leioa, Spain; (M.O.); (C.P.); (V.R.K.)
- Research Centre for Experimental Marine Biology and Biotechnology (PIE-UPV/EHU), 48620 Plentzia, Spain
| | - Claudia Parada
- Department of Immunology, Microbiology and Parasitology, Faculty of Science and Technology, University of the Basque Country UPV/EHU, 48340 Leioa, Spain; (M.O.); (C.P.); (V.R.K.)
| | - Vladimir R. Kaberdin
- Department of Immunology, Microbiology and Parasitology, Faculty of Science and Technology, University of the Basque Country UPV/EHU, 48340 Leioa, Spain; (M.O.); (C.P.); (V.R.K.)
- Research Centre for Experimental Marine Biology and Biotechnology (PIE-UPV/EHU), 48620 Plentzia, Spain
- IKERBASQUE, Basque Foundation for Science, 48013 Bilbao, Spain
| | - Inés Arana
- Department of Immunology, Microbiology and Parasitology, Faculty of Science and Technology, University of the Basque Country UPV/EHU, 48340 Leioa, Spain; (M.O.); (C.P.); (V.R.K.)
- Research Centre for Experimental Marine Biology and Biotechnology (PIE-UPV/EHU), 48620 Plentzia, Spain
- Correspondence:
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Michotey V, Blanfuné A, Chevalier C, Garel M, Diaz F, Berline L, Le Grand L, Armougom F, Guasco S, Ruitton S, Changeux T, Belloni B, Blanchot J, Ménard F, Thibaut T. In situ observations and modelling revealed environmental factors favouring occurrence of Vibrio in microbiome of the pelagic Sargassum responsible for strandings. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 748:141216. [PMID: 32798861 DOI: 10.1016/j.scitotenv.2020.141216] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2020] [Revised: 07/22/2020] [Accepted: 07/22/2020] [Indexed: 06/11/2023]
Abstract
Historically, pelagic Sargassum were only found in the Sargasso Sea. Since 2011, blooms were regularly observed in warmer water, further south. Their developments in Central Atlantic are associated with mass strandings on the coasts, causing important damages and potentially dispersion of new bacteria. Microbiomes associated with pelagic Sargassum were analysed at large scale in Central Atlantic and near Caribbean Islands with a focus on pathogenic bacteria. Vibrio appeared widely distributed among pelagic Sargassum microbiome of our samples with higher occurrence than previously found in Mexico Gulf. Six out the 16 Vibrio-OTUs (Operational Taxonomic Unit), representing 81.2 ± 13.1% of the sequences, felt in cluster containing pathogens. Among the four different microbial profiles of pelagic Sargassum microbiome, Vibrio attained about 2% in two profiles whereas it peaked, in the two others, at 6.5 and 26.8% respectively, largely above the concentrations found in seawater surrounding raft (0.5%). In addition to sampling and measurements, we performed backward Lagrangian modelling of trajectories of rafts, and rebuilt the sampled rafts environmental history allowing us to estimate Sargassum growth rates along raft displacements. We found that Vibrio was favoured by high Sargassum growth rate and in situ ammonium and nitrite, modelled phosphate and nitrate concentrations, whereas zooplankters, benthic copepods, and calm wind (proxy of raft buoyancy near the sea surface) were less favourable for them. Relations between Vibrio and other main bacterial groups identified a competition with Alteromonas. According to forward Lagrangian tracking, part of rafts containing Vibrio could strand on the Caribbean coasts, however the strong decreases of modelled Sargassum growth rates along this displacement suggest unfavourable environment for Vibrio. For the conditions and areas observed, the sanitary risk seemed in consequence minor, but in other areas or conditions where high Sargassum growth rate occurred near coasts, it could be more important.
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Affiliation(s)
- Valérie Michotey
- Aix Marseille Univ, Université de Toulon, CNRS, IRD, MIO, 13288 Marseille, France.
| | - Aurélie Blanfuné
- Aix Marseille Univ, Université de Toulon, CNRS, IRD, MIO, 13288 Marseille, France
| | - Cristèle Chevalier
- Aix Marseille Univ, Université de Toulon, CNRS, IRD, MIO, 13288 Marseille, France
| | - Marc Garel
- Aix Marseille Univ, Université de Toulon, CNRS, IRD, MIO, 13288 Marseille, France
| | - Frédéric Diaz
- Aix Marseille Univ, Université de Toulon, CNRS, IRD, MIO, 13288 Marseille, France
| | - Léo Berline
- Aix Marseille Univ, Université de Toulon, CNRS, IRD, MIO, 13288 Marseille, France
| | - Louis Le Grand
- Aix Marseille Univ, Université de Toulon, CNRS, IRD, MIO, 13288 Marseille, France
| | - Fabrice Armougom
- Aix Marseille Univ, Université de Toulon, CNRS, IRD, MIO, 13288 Marseille, France
| | - Sophie Guasco
- Aix Marseille Univ, Université de Toulon, CNRS, IRD, MIO, 13288 Marseille, France
| | - Sandrine Ruitton
- Aix Marseille Univ, Université de Toulon, CNRS, IRD, MIO, 13288 Marseille, France
| | - Thomas Changeux
- Aix Marseille Univ, Université de Toulon, CNRS, IRD, MIO, 13288 Marseille, France
| | - Bruno Belloni
- Aix Marseille Univ, Université de Toulon, CNRS, IRD, MIO, 13288 Marseille, France
| | - Jean Blanchot
- Aix Marseille Univ, Université de Toulon, CNRS, IRD, MIO, 13288 Marseille, France
| | - Frédéric Ménard
- Aix Marseille Univ, Université de Toulon, CNRS, IRD, MIO, 13288 Marseille, France
| | - Thierry Thibaut
- Aix Marseille Univ, Université de Toulon, CNRS, IRD, MIO, 13288 Marseille, France
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Regulation of filamentation by bacteria and its impact on the productivity of compounds in biotechnological processes. Appl Microbiol Biotechnol 2020; 104:4631-4642. [DOI: 10.1007/s00253-020-10590-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2020] [Revised: 03/18/2020] [Accepted: 03/25/2020] [Indexed: 12/29/2022]
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Orruño M, Kaberdin VR, Arana I. Survival strategies of Escherichia coli and Vibrio spp.: contribution of the viable but nonculturable phenotype to their stress-resistance and persistence in adverse environments. World J Microbiol Biotechnol 2017; 33:45. [PMID: 28161849 DOI: 10.1007/s11274-017-2218-5] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2016] [Accepted: 01/23/2017] [Indexed: 12/11/2022]
Abstract
In their natural ecosystems, bacteria are continuously exposed to changing environmental factors including physicochemical parameters (e.g. temperature, pH, etc.), availability of nutrients as well as interaction(s) with other organisms. To increase their tolerance and survival under adverse conditions, bacteria trigger a number of adaptation mechanisms. One of the well-known adaptation responses of the non-spore-forming bacteria is the acquisition of the viable but non-culturable (VBNC) state. This phenotype is induced by different stress factors (e.g. low temperature) and is characterized by the temporal loss of culturability, which can potentially be restored. Moreover, this response can be combined with the bust and boom strategy, which implies the death of the main population of the stressed cells (or their entry into the VBNC state) upon stress, thus enabling the remaining cells (i.e. residual culturable population) to subsist at the expense of the dead or/and VBNC cells. In this review, we discuss the characteristics of the VBNC state, its biological significance and contribution to bacterial survival.
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Affiliation(s)
- M Orruño
- Department of Immunology, Microbiology and Parasitology, University of the Basque Country (UPV/EHU), Barrio Sarriena S/n, 48940, Leioa, Spain
| | - V R Kaberdin
- Department of Immunology, Microbiology and Parasitology, University of the Basque Country (UPV/EHU), Barrio Sarriena S/n, 48940, Leioa, Spain.,IKERBASQUE, Basque Foundation for Science, María Díaz de Haro 3, 48013, Bilbao, Spain
| | - I Arana
- Department of Immunology, Microbiology and Parasitology, University of the Basque Country (UPV/EHU), Barrio Sarriena S/n, 48940, Leioa, Spain.
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Amiraux R, Jeanthon C, Vaultier F, Rontani JF. Paradoxical effects of temperature and solar irradiance on the photodegradation state of killed phytoplankton. JOURNAL OF PHYCOLOGY 2016; 52:475-485. [PMID: 26992328 DOI: 10.1111/jpy.12410] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2015] [Accepted: 02/28/2016] [Indexed: 06/05/2023]
Abstract
The aim of this paper was to study the effects of temperature and irradiance on the photodegradation state of killed phytoplankton cells. For this purpose, killed cells of the diatom Chaetoceros neogracilis RCC2022 were irradiated (photosynthetically active radiation) at 36 and 446 J · s(-1) · m(-2) (for the same cumulative dose of irradiation energy) and at two temperatures (7°C and 17°C). Analyses of specific lipid tracers (fatty acids and sterols) revealed that low temperatures and irradiances increased photooxidative damages of monounsaturated lipids (i.e., palmitoleic acid, cholesterol and campesterol). The high efficiency of type II photosensitized degradation processes was attributed to: (i) the relative preservation of the sensitizer (chlorophyll) at low irradiances allowing a longer production of singlet oxygen and (ii) the slow diffusion rate of singlet oxygen through membranes at low temperatures inducing more damages. Conversely, high temperatures and irradiances induced (i) a rapid degradation of the photosensitizer and a loss of singlet oxygen by diffusion outside the membranes (limiting type II photosensitized oxidation), and (ii) intense autoxidation processes degrading unsaturated cell lipids and oxidation products used as photodegradation tracers. Our results may explain the paradoxical relationship observed in situ between latitude and photodegradation state of phytoplankton cells.
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Affiliation(s)
- Rémi Amiraux
- Aix Marseille Université, CNRS/INSU, Université de Toulon, IRD, Mediterranean Institute of Oceanography (MIO) UM 110, Marseille, 13288, France
| | - Christian Jeanthon
- CNRS, UMR 7144, Marine Phototrophic Prokaryotes Team, Station Biologique de Roscoff, Roscoff, 29680, France
- Sorbonne Universités, UPMC Univ Paris 06, UMR 7144, Oceanic Plankton Group, Station Biologique de Roscoff, Roscoff, 29680, France
| | - Frédéric Vaultier
- Aix-Marseille University, Mediterranean Institute of Oceanography (MIO), Marseille Cedex 9, 13288, France
- CNRS-INSU/IRD UM 110, Université du Sud Toulon-Var, La Garde, 83957, France
| | - Jean-François Rontani
- Aix-Marseille University, Mediterranean Institute of Oceanography (MIO), Marseille Cedex 9, 13288, France
- CNRS-INSU/IRD UM 110, Université du Sud Toulon-Var, La Garde, 83957, France
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Petit M, Bonin P, Amiraux R, Michotey V, Guasco S, Armitano J, Jourlin-Castelli C, Vaultier F, Méjean V, Rontani JF. Dynamic of bacterial communities attached to lightened phytodetritus. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2015; 22:13681-13692. [PMID: 25687611 DOI: 10.1007/s11356-015-4209-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2014] [Accepted: 02/04/2015] [Indexed: 06/04/2023]
Abstract
The effects of singlet oxygen ((1)O2) transfer to bacteria attached on phytodetritus were investigated under laboratory-controlled conditions. For this purpose, a nonaxenic culture of Emiliania huxleyi in late stationary phase was studied for bacterial viability. Our results indicated that only 9 ± 3% of attached bacteria were alive compared to 46 ± 23% for free bacteria in the E. huxleyi culture. Apparently, under conditions of low irradiance (36 W m(-2)), during the culture, the cumulative dose received (22,000 kJ m(-2)) was sufficiently important to induce an efficient (1)O2 transfer to attached bacteria during the senescence of E. huxleyi cells. At this stage, attached bacteria appeared to be dominated by pigmented bacteria (Maribacter, Roseobacter, Roseovarius), which should resist to (1)O2 stress probably due to their high contents of carotenoids. After subsequent irradiation of the culture until fully photodegradation of chlorophyll, DGGE analyses showed that the diversity of bacteria attached to E. huxleyi cells is modified by light. Photooxidative alterations of bacteria were confirmed by the increasing amounts of cis-vaccenic photoproducts (bacterial marker) per bacteria observed during irradiation time. Interestingly, preliminary chemotaxis experiments showed that Shewanella oneidensis considered here as a model of motile bacteria was attracted by phytodetritus producing or not (1)O2. This lack of repulsive effects could explain the high mortality rate of bacteria measured on E. huxleyi cells.
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Affiliation(s)
- Morgan Petit
- Aix-Marseille Université, Mediterranean Institute of Oceanography (MIO), Université du Sud Toulon-Var, 83957, CNRS-INSU/IRD UM 110, 13288, Marseille, Cedex 9, France
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Matallana-Surget S, Cavicchioli R, Fauconnier C, Wattiez R, Leroy B, Joux F, Raftery MJ, Lebaron P. Shotgun redox proteomics: identification and quantitation of carbonylated proteins in the UVB-resistant marine bacterium, Photobacterium angustum S14. PLoS One 2013; 8:e68112. [PMID: 23874515 PMCID: PMC3706606 DOI: 10.1371/journal.pone.0068112] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2013] [Accepted: 05/25/2013] [Indexed: 11/28/2022] Open
Abstract
UVB oxidizes proteins through the generation of reactive oxygen species. One consequence of UVB irradiation is carbonylation, the irreversible formation of a carbonyl group on proline, lysine, arginine or threonine residues. In this study, redox proteomics was performed to identify carbonylated proteins in the UVB resistant marine bacterium Photobacterium angustum. Mass-spectrometry was performed with either biotin-labeled or dinitrophenylhydrazide (DNPH) derivatized proteins. The DNPH redox proteomics method enabled the identification of 62 carbonylated proteins (5% of 1221 identified proteins) in cells exposed to UVB or darkness. Eleven carbonylated proteins were quantified and the UVB/dark abundance ratio was determined at both the protein and peptide levels. As a result we determined which functional classes of proteins were carbonylated, which residues were preferentially modified, and what the implications of the carbonylation were for protein function. As the first large scale, shotgun redox proteomics analysis examining carbonylation to be performed on bacteria, our study provides a new level of understanding about the effects of UVB on cellular proteins, and provides a methodology for advancing studies in other biological systems.
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Affiliation(s)
- Sabine Matallana-Surget
- UPMC Univ Paris 06, UMR7621, Laboratoire d'Océanographie Microbienne, Observatoire Océanologique, Banyuls/mer, France.
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Petit M, Sempéré R, Vaultier F, Rontani JF. Photochemical production and behavior of hydroperoxyacids in heterotrophic bacteria attached to senescent phytoplanktonic cells. Int J Mol Sci 2013; 14:11795-815. [PMID: 23736689 PMCID: PMC3709756 DOI: 10.3390/ijms140611795] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2013] [Revised: 05/17/2013] [Accepted: 05/24/2013] [Indexed: 11/16/2022] Open
Abstract
The photooxidation of cellular monounsaturated fatty acids was investigated in senescent phytoplanktonic cells (Emiliania huxleyi) and in their attached bacteria under laboratory controlled conditions. Our results indicated that UV-visible irradiation of phytodetritus induced the photooxidation of oleic (produced by phytoplankton and bacteria) and cis-vaccenic (specifically produced by bacteria) acids. These experiments confirmed the involvement of a substantial singlet oxygen transfer from senescent phytoplanktonic cells to attached bacteria, and revealed a significant correlation between the concentration of chlorophyll, a photosensitizer, in the phytodetritus and the photodegradation state of bacteria. Hydroperoxyacids (fatty acid photoproducts) appeared to be quickly degraded to ketoacids and hydroxyacids in bacteria and in phytoplanktonic cells. This degradation involves homolytic cleavage (most likely induced by UV and/or transition metal ions) and peroxygenase activity (yielding epoxy acids).
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Affiliation(s)
- Morgan Petit
- Mediterranean Institute of Oceanography (MIO), Aix Marseille Université, CNRS/INSU, IRD, UM 110, 13288 Marseille, France; E-Mails: (R.S.); (F.V.); (J.-F.R.)
- Mediterranean Institute of Oceanography (MIO), Université de Toulon, CNRS/INSU, IRD, UM 110, 83957 La Garde, France
- Author to whom correspondence should be addressed; E-Mail: ; Tel.: +33-4-9182-9050; Fax: +33-4-9182-9051
| | - Richard Sempéré
- Mediterranean Institute of Oceanography (MIO), Aix Marseille Université, CNRS/INSU, IRD, UM 110, 13288 Marseille, France; E-Mails: (R.S.); (F.V.); (J.-F.R.)
- Mediterranean Institute of Oceanography (MIO), Université de Toulon, CNRS/INSU, IRD, UM 110, 83957 La Garde, France
| | - Frédéric Vaultier
- Mediterranean Institute of Oceanography (MIO), Aix Marseille Université, CNRS/INSU, IRD, UM 110, 13288 Marseille, France; E-Mails: (R.S.); (F.V.); (J.-F.R.)
- Mediterranean Institute of Oceanography (MIO), Université de Toulon, CNRS/INSU, IRD, UM 110, 83957 La Garde, France
| | - Jean-François Rontani
- Mediterranean Institute of Oceanography (MIO), Aix Marseille Université, CNRS/INSU, IRD, UM 110, 13288 Marseille, France; E-Mails: (R.S.); (F.V.); (J.-F.R.)
- Mediterranean Institute of Oceanography (MIO), Université de Toulon, CNRS/INSU, IRD, UM 110, 83957 La Garde, France
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Santos AL, Oliveira V, Baptista I, Henriques I, Gomes NCM, Almeida A, Correia A, Cunha Â. Wavelength dependence of biological damage induced by UV radiation on bacteria. Arch Microbiol 2012; 195:63-74. [PMID: 23090570 DOI: 10.1007/s00203-012-0847-5] [Citation(s) in RCA: 125] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2012] [Revised: 09/26/2012] [Accepted: 10/07/2012] [Indexed: 11/28/2022]
Abstract
The biological effects of UV radiation of different wavelengths (UVA, UVB and UVC) were assessed in nine bacterial isolates displaying different UV sensitivities. Biological effects (survival and activity) and molecular markers of oxidative stress [DNA strand breakage (DSB), generation of reactive oxygen species (ROS), oxidative damage to proteins and lipids, and the activity of antioxidant enzymes catalase and superoxide dismutase] were quantified and statistically analyzed in order to identify the major determinants of cell inactivation under the different spectral regions. Survival and activity followed a clear wavelength dependence, being highest under UVA and lowest under UVC. The generation of ROS, as well as protein and lipid oxidation, followed the same pattern. DNA damage (DSB) showed the inverse trend. Multiple stepwise regression analysis revealed that survival under UVA, UVB and UVC wavelengths was best explained by DSB, oxidative damage to lipids, and intracellular ROS levels, respectively.
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Affiliation(s)
- Ana L Santos
- Department of Biology & CESAM, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal
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Matallana-Surget S, Joux F, Wattiez R, Lebaron P. Proteome analysis of the UVB-resistant marine bacterium Photobacterium angustum S14. PLoS One 2012; 7:e42299. [PMID: 22870314 PMCID: PMC3411663 DOI: 10.1371/journal.pone.0042299] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2012] [Accepted: 07/03/2012] [Indexed: 12/22/2022] Open
Abstract
The proteome of the marine bacterium Photobacterium angustum S14 was exposed to UVB and analyzed by the implementation of both the post-digest ICPL labeling method and 2D-DIGE technique using exponentially growing cells. A total of 40 and 23 proteins were quantified in all replicates using either the ICPL or 2D-DIGE methods, respectively. By combining both datasets from 8 biological replicates (4 biological replicates for each proteomics technique), 55 proteins were found to respond significantly to UVB radiation in P. angustum. A total of 8 UVB biomarkers of P. angustum were quantified in all replicates using both methods. Among them, the protein found to present the highest increase in abundance (almost a 3-fold change) was RecA, which is known to play a crucial role in the so-called recombinational repair process. We also observed a high number of antioxidants, transport proteins, metabolism-related proteins, transcription/translation regulators, chaperonins and proteases. We also discuss and compare the UVB response and global protein expression profiles obtained for two different marine bacteria with trophic lifestyles: the copiotroph P. angustum and oligotroph Sphingopyxis alaskensis.
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Affiliation(s)
- Sabine Matallana-Surget
- UPMC Univ Paris 06, UMR7621, Laboratoire d'Océanographie Microbienne, Observatoire Océanologique, Banyuls/mer, France.
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Abstract
The biological functions of light emission in bacterial bioluminescence are not always obvious, especially if the bacteria are in a free-living mode. Experimental evidence suggests that light emission confers benefit to the bacteria themselves such as through photoreactivation and involves as much as 20% of cell energy metabolism. A theoretical model shows if the effect is mediated solely by light then cells should be luminescent at both high and low cell densities, therefore raising doubt over the photoreactivation hypothesis and suggesting that another cofactor is involved. It has been postulated that bioelectromagnetics may be involved in biological processes and be involved with coordinated activity in quorate cells. The cell densities associated with autoinduction coincide with a large change in coupling efficiency in the millimeter and submillimeter spectral region. In this paper it is suggested that one function of bioluminescence is as a pump, involving millimeter and submillimeter wave coupling that is of benefit to the quorum. This may be related to the observation that millimeter wave radiation exposure has been reported to induce changes in DNA conformation and possibly gene expression. Agents that change DNA conformation in bioluminescent bacteria can cause increases in light emission. This work may have implications for electromagnetic fields as quorum-quenching agents.
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Affiliation(s)
- David T Pooley
- Cardiff School of Engineering, Cardiff University, Cardiff, UK.
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Modenutti B, Balseiro E, Corno G, Callieri C, Bertoni R, Caravati E. Ultraviolet Radiation Induces Filamentation in Bacterial Assemblages from North Andean Patagonian Lakes. Photochem Photobiol 2010; 86:871-81. [DOI: 10.1111/j.1751-1097.2010.00758.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Pennebaker K, Mackey KRM, Smith RM, Williams SB, Zehr JP. Diel cycling of DNA staining and nifH gene regulation in the unicellular cyanobacterium Crocosphaera watsonii strain WH 8501 (Cyanophyta). Environ Microbiol 2010; 12:1001-10. [PMID: 20105217 DOI: 10.1111/j.1462-2920.2010.02144.x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
Crocosphaera watsonii WH 8501 is a marine unicellular cyanobacterium that fixes nitrogen primarily during the dark phase of a light-dark (LD) cycle. Circadian clocks modulate gene transcription and cellular activity in many, if not all, cyanobacteria. A model for circadian control has been proposed in cyanobacteria, called the oscilloid model, which is based on topological changes of nucleoid DNA which in turn regulates gene transcription. In this study, the marine unicellular diazotrophic cyanobacteria C. watsonii WH 8501 and Cyanothece sp. ATCC 51142 were found to have daily fluctuations in DNA staining using Hoechst 33342 and SYBR I Green fluorescent dyes. Up to 20-fold decreases in DNA fluorescence of Hoechst-stained cells were observed during the dark phase when cultures were grown with a 12:12 LD cycle or under continuous light (LL). The variation in DNA staining was consistent with changes in DNA topology proposed in the oscilloid model. The abundance of nifH transcripts in C. watsonii WH 8501 was rhythmic under LD and LL cycles, consistent with a circadian rhythm. Cycles of DNA fluorescence and photosynthetic efficiency were disrupted when cultures were shifted into an early dark phase; however, nifH transcripts predictably increased in abundance following the premature transition from light to darkness. Thus, nifH gene expression in C. watsonii WH 8501 appears to be influenced by both circadian and environmental factors.
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Affiliation(s)
- Kory Pennebaker
- Ocean Sciences Department, University of California, Santa Cruz, CA 95064, USA
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Matallana-Surget S, Douki T, Cavicchioli R, Joux F. Remarkable resistance to UVB of the marine bacterium Photobacterium angustum explained by an unexpected role of photolyase. Photochem Photobiol Sci 2009; 8:1313-20. [DOI: 10.1039/b902715g] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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