The Assembly and Functions of Microbial Communities on Complex Substrates
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Mining Saltmarsh Sediment Microbes for Enzymes to Degrade Recalcitrant Biomass
Mining saltmarsh sediment microbes for enzymes to degrade recalcitrant biomass Juliana Sanchez Alponti PhD University of York Biology September 2019 Abstract Abstract The recalcitrance of biomass represents a major bottleneck for the efficient production of fermentable sugars from biomass. Cellulase cocktails are often only able to release 75-80% of the potential sugars from biomass and this adds to the overall costs of lignocellulosic processing. The high amounts of fresh water used in biomass processing also adds to the overall costs and environmental footprint of this process. A more sustainable approach could be the use of seawater during the process, saving the valuable fresh water for human consumption and agriculture. For such replacement to be viable, there is a need to identify salt tolerant lignocellulose-degrading enzymes. We have been prospecting for enzymes from the marine environment that attack the more recalcitrant components of lignocellulosic biomass. To achieve these ends, we have carried out selective culture enrichments using highly degraded biomass and inoculum taken from a saltmarsh. Saltmarshes are highly productive ecosystems, where most of the biomass is provided by land plants and is therefore rich in lignocellulose. Lignocellulose forms the major source of biomass to feed the large communities of heterotrophic organisms living in saltmarshes, which are likely to contain a range of microbial species specialised for the degradation of lignocellulosic biomass. We took biomass from the saltmarsh grass Spartina anglica that had been previously degraded by microbes over a 10-week period, losing 70% of its content in the process. This recalcitrant biomass was then used as the sole carbon source in a shake-flask culture inoculated with saltmarsh sediment. -
The Hydrocarbondegrading Marine Bacterium Cobetia Sp. Strain
bs_bs_banner The hydrocarbon-degrading marine bacterium Cobetia sp. strain MM1IDA2H-1 produces a biosurfactant that interferes with quorum sensing of fish pathogens by signal hijacking C. Ibacache-Quiroga,1 J. Ojeda,1 G. quorum sensing signals. Using biosensors for Espinoza-Vergara,1 P. Olivero,3 M. Cuellar2 and quorum sensing based on Chromobacterium viol- M. A. Dinamarca1* aceum and Vibrio anguillarum, we showed that when 1Laboratorio de Biotecnología Microbiana and the purified biosurfactant was mixed with N-acyl 2Departamento de Ciencias Químicas y Recursos homoserine lactones produced by A. salmonicida, Naturales, Facultad de Farmacia, Universidad de quorum sensing was inhibited, although bacterial Valparaíso, Gran Bretaña 1093, 2360102, Valparaíso, growth was not affected. In addition, the transcrip- Chile. tional activities of A. salmonicida virulence genes 3Centro de Investigaciones Biomédicas, Facultad de that are controlled by quorum sensing were Medicina, Universidad de Valparaíso, Hontaneda 2653, repressed by both the purified biosurfactant and the 2341369, Valparaíso, Chile. growth in the presence of Cobetia sp. MM1IDA2H-1. We propose that the biosurfactant, or the lipid struc- tures interact with the N-acyl homoserine lactones, Summary inhibiting their function. This could be used as a strat- Biosurfactants are produced by hydrocarbon- egy to interfere with the quorum sensing systems of degrading marine bacteria in response to the pres- bacterial fish pathogens, which represents an attrac- ence of water-insoluble hydrocarbons. This is tive alternative to classical antimicrobial therapies in believed to facilitate the uptake of hydrocarbons fish aquaculture. by bacteria. However, these diffusible amphiphilic surface-active molecules are involved in several Introduction other biological functions such as microbial compe- tition and intra- or inter-species communication. -
Genomic Insight Into the Host–Endosymbiont Relationship of Endozoicomonas Montiporae CL-33T with Its Coral Host
ORIGINAL RESEARCH published: 08 March 2016 doi: 10.3389/fmicb.2016.00251 Genomic Insight into the Host–Endosymbiont Relationship of Endozoicomonas montiporae CL-33T with its Coral Host Jiun-Yan Ding 1, Jia-Ho Shiu 1, Wen-Ming Chen 2, Yin-Ru Chiang 1 and Sen-Lin Tang 1* 1 Biodiversity Research Center, Academia Sinica, Taipei, Taiwan, 2 Department of Seafood Science, Laboratory of Microbiology, National Kaohsiung Marine University, Kaohsiung, Taiwan The bacterial genus Endozoicomonas was commonly detected in healthy corals in many coral-associated bacteria studies in the past decade. Although, it is likely to be a core member of coral microbiota, little is known about its ecological roles. To decipher potential interactions between bacteria and their coral hosts, we sequenced and investigated the first culturable endozoicomonal bacterium from coral, the E. montiporae CL-33T. Its genome had potential sign of ongoing genome erosion and gene exchange with its Edited by: Rekha Seshadri, host. Testosterone degradation and type III secretion system are commonly present in Department of Energy Joint Genome Endozoicomonas and may have roles to recognize and deliver effectors to their hosts. Institute, USA Moreover, genes of eukaryotic ephrin ligand B2 are present in its genome; presumably, Reviewed by: this bacterium could move into coral cells via endocytosis after binding to coral’s Eph Kathleen M. Morrow, University of New Hampshire, USA receptors. In addition, 7,8-dihydro-8-oxoguanine triphosphatase and isocitrate lyase Jean-Baptiste Raina, are possible type III secretion effectors that might help coral to prevent mitochondrial University of Technology Sydney, Australia dysfunction and promote gluconeogenesis, especially under stress conditions. -
Table 1. Overview of Reactions Examined in This Study. ΔG Values Were Obtained from Thauer Et Al., 1977
Supplemental Information: Table 1. Overview of reactions examined in this study. ΔG values were obtained from Thauer et al., 1977. No. Equation ∆G°' (kJ/reaction)* Acetogenic reactions – – – + 1 Propionate + 3 H2O → Acetate + HCO3 + 3 H2 + H +76.1 Sulfate-reducing reactions – 2– – – – + 2 Propionate + 0.75 SO4 → Acetate + 0.75 HS + HCO3 + 0.25 H –37.8 2– + – 3 4 H2 + SO4 + H → HS + 4 H2O –151.9 – 2– – – 4 Acetate + SO4 → 2 HCO3 + HS –47.6 Methanogenic reactions – – + 5 4 H2 + HCO3 + H → CH4 + 3 H2O –135.6 – – 6 Acetate + H2O → CH4 + HCO3 –31.0 Syntrophic propionate conversion – – – + 1+5 Propionate + 0.75 H2O → Acetate + 0.75 CH4 + 0.25 HCO3 + 0.25 H –25.6 Complete propionate conversion by SRB – 2– – – + 2+4 Propionate + 1.75 SO4 → 1.75 HS + 3 HCO3 + 0.25 H –85.4 Complete propionate conversion by syntrophs and methanogens 1+5+6 Propionate– + 1.75 H O → 1.75 CH + 1.25 HCO – + 0.25 H+ –56.6 2 4 3 1 Table S2. Overview of all enrichment slurries fed with propionate and the total amounts of the reactants consumed and products formed during the enrichment period. The enrichment slurries consisted of sediment from either the sulfate zone (SZ), sulfate-methane transition zone (SMTZ) or methane zone (MZ) and were incubated at 25°C or 10°C, with 3 mM, 20 mM or without (-) sulfate amendments along the study. The slurries P1/P2, P3/P4, P5/P6, P7/P8 from each sediment zone are biological replicates. Slurries with * are presented in the propionate conversion graphs and used for molecular analysis. -
Updating the Taxonomic Toolbox: Classification of Alteromonas Spp
1 Updating the taxonomic toolbox: classification of Alteromonas spp. 2 using Multilocus Phylogenetic Analysis and MALDI-TOF Mass 3 Spectrometry a a a 4 Hooi Jun Ng , Hayden K. Webb , Russell J. Crawford , François a b b c 5 Malherbe , Henry Butt , Rachel Knight , Valery V. Mikhailov and a, 6 Elena P. Ivanova * 7 aFaculty of Life and Social Sciences, Swinburne University of Technology, 8 PO Box 218, Hawthorn, Vic 3122, Australia 9 bBioscreen, Bio21 Institute, The University of Melbourne, Vic 3010, Australia 10 cG.B. Elyakov Pacific Institute of Bioorganic Chemistry, Far Eastern Branch, Russian 11 Academy of Sciences, Vladivostok 690022, Russian Federation 12 13 *Corresponding author: Tel: +61-3-9214-5137. Fax: +61-3-9214-5050. 14 E-mail: [email protected] 15 16 Abstract 17 Bacteria of the genus Alteromonas are Gram-negative, strictly aerobic, motile, 18 heterotrophic marine bacteria, known for their versatile metabolic activities. 19 Identification and classification of novel species belonging to the genus Alteromonas 20 generally involves DNA-DNA hybridization (DDH) as distinct species often fail to be 1 21 resolved at the 97% threshold value of the 16S rRNA gene sequence similarity. In this 22 study, the applicability of Multilocus Phylogenetic Analysis (MLPA) and Matrix- 23 Assisted Laser Desorption Ionization Time-of-Flight Mass Spectrometry (MALDI-TOF 24 MS) for the differentiation of Alteromonas species has been evaluated. Phylogenetic 25 analysis incorporating five house-keeping genes (dnaK, sucC, rpoB, gyrB, and rpoD) 26 revealed a threshold value of 98.9% that could be considered as the species cut-off 27 value for the delineation of Alteromonas spp. -
Motiliproteus Sediminis Gen. Nov., Sp. Nov., Isolated from Coastal Sediment
Antonie van Leeuwenhoek (2014) 106:615–621 DOI 10.1007/s10482-014-0232-2 ORIGINAL PAPER Motiliproteus sediminis gen. nov., sp. nov., isolated from coastal sediment Zong-Jie Wang • Zhi-Hong Xie • Chao Wang • Zong-Jun Du • Guan-Jun Chen Received: 3 April 2014 / Accepted: 4 July 2014 / Published online: 20 July 2014 Ó Springer International Publishing Switzerland 2014 Abstract A novel Gram-stain-negative, rod-to- demonstrated that the novel isolate was 93.3 % similar spiral-shaped, oxidase- and catalase- positive and to the type strain of Neptunomonas antarctica, 93.2 % facultatively aerobic bacterium, designated HS6T, was to Neptunomonas japonicum and 93.1 % to Marino- isolated from marine sediment of Yellow Sea, China. bacterium rhizophilum, the closest cultivated rela- It can reduce nitrate to nitrite and grow well in marine tives. The polar lipid profile of the novel strain broth 2216 (MB, Hope Biol-Technology Co., Ltd) consisted of phosphatidylethanolamine, phosphatidyl- with an optimal temperature for growth of 30–33 °C glycerol and some other unknown lipids. Major (range 12–45 °C) and in the presence of 2–3 % (w/v) cellular fatty acids were summed feature 3 (C16:1 NaCl (range 0.5–7 %, w/v). The pH range for growth x7c/iso-C15:0 2-OH), C18:1 x7c and C16:0 and the main was pH 6.2–9.0, with an optimum at 6.5–7.0. Phylo- respiratory quinone was Q-8. The DNA G?C content genetic analysis based on 16S rRNA gene sequences of strain HS6T was 61.2 mol %. Based on the phylogenetic, physiological and biochemical charac- teristics, strain HS6T represents a novel genus and The GenBank accession number for the 16S rRNA gene T species and the name Motiliproteus sediminis gen. -
Spatiotemporal Dynamics of Marine Bacterial and Archaeal Communities in Surface Waters Off the Northern Antarctic Peninsula
Spatiotemporal dynamics of marine bacterial and archaeal communities in surface waters off the northern Antarctic Peninsula Camila N. Signori, Vivian H. Pellizari, Alex Enrich Prast and Stefan M. Sievert The self-archived postprint version of this journal article is available at Linköping University Institutional Repository (DiVA): http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-149885 N.B.: When citing this work, cite the original publication. Signori, C. N., Pellizari, V. H., Enrich Prast, A., Sievert, S. M., (2018), Spatiotemporal dynamics of marine bacterial and archaeal communities in surface waters off the northern Antarctic Peninsula, Deep-sea research. Part II, Topical studies in oceanography, 149, 150-160. https://doi.org/10.1016/j.dsr2.2017.12.017 Original publication available at: https://doi.org/10.1016/j.dsr2.2017.12.017 Copyright: Elsevier http://www.elsevier.com/ Spatiotemporal dynamics of marine bacterial and archaeal communities in surface waters off the northern Antarctic Peninsula Camila N. Signori1*, Vivian H. Pellizari1, Alex Enrich-Prast2,3, Stefan M. Sievert4* 1 Departamento de Oceanografia Biológica, Instituto Oceanográfico, Universidade de São Paulo (USP). Praça do Oceanográfico, 191. CEP: 05508-900 São Paulo, SP, Brazil. 2 Department of Thematic Studies - Environmental Change, Linköping University. 581 83 Linköping, Sweden 3 Departamento de Botânica, Instituto de Biologia, Universidade Federal do Rio de Janeiro (UFRJ). Av. Carlos Chagas Filho, 373. CEP: 21941-902. Rio de Janeiro, Brazil 4 Biology Department, Woods Hole Oceanographic Institution (WHOI). 266 Woods Hole Road, Woods Hole, MA 02543, United States. *Corresponding authors: Camila Negrão Signori Address: Departamento de Oceanografia Biológica, Instituto Oceanográfico, Universidade de São Paulo, São Paulo, Brazil. -
Comparative Proteomic Profiling of Newly Acquired, Virulent And
www.nature.com/scientificreports OPEN Comparative proteomic profling of newly acquired, virulent and attenuated Neoparamoeba perurans proteins associated with amoebic gill disease Kerrie Ní Dhufaigh1*, Eugene Dillon2, Natasha Botwright3, Anita Talbot1, Ian O’Connor1, Eugene MacCarthy1 & Orla Slattery4 The causative agent of amoebic gill disease, Neoparamoeba perurans is reported to lose virulence during prolonged in vitro maintenance. In this study, the impact of prolonged culture on N. perurans virulence and its proteome was investigated. Two isolates, attenuated and virulent, had their virulence assessed in an experimental trial using Atlantic salmon smolts and their bacterial community composition was evaluated by 16S rRNA Illumina MiSeq sequencing. Soluble proteins were isolated from three isolates: a newly acquired, virulent and attenuated N. perurans culture. Proteins were analysed using two-dimensional electrophoresis coupled with liquid chromatography tandem mass spectrometry (LC–MS/MS). The challenge trial using naïve smolts confrmed a loss in virulence in the attenuated N. perurans culture. A greater diversity of bacterial communities was found in the microbiome of the virulent isolate in contrast to a reduction in microbial community richness in the attenuated microbiome. A collated proteome database of N. perurans, Amoebozoa and four bacterial genera resulted in 24 proteins diferentially expressed between the three cultures. The present LC–MS/ MS results indicate protein synthesis, oxidative stress and immunomodulation are upregulated in a newly acquired N. perurans culture and future studies may exploit these protein identifcations for therapeutic purposes in infected farmed fsh. Neoparamoeba perurans is an ectoparasitic protozoan responsible for the hyperplastic gill infection of marine cultured fnfsh referred to as amoebic gill disease (AGD)1. -
Supplementary Information for Microbial Electrochemical Systems Outperform Fixed-Bed Biofilters for Cleaning-Up Urban Wastewater
Electronic Supplementary Material (ESI) for Environmental Science: Water Research & Technology. This journal is © The Royal Society of Chemistry 2016 Supplementary information for Microbial Electrochemical Systems outperform fixed-bed biofilters for cleaning-up urban wastewater AUTHORS: Arantxa Aguirre-Sierraa, Tristano Bacchetti De Gregorisb, Antonio Berná, Juan José Salasc, Carlos Aragónc, Abraham Esteve-Núñezab* Fig.1S Total nitrogen (A), ammonia (B) and nitrate (C) influent and effluent average values of the coke and the gravel biofilters. Error bars represent 95% confidence interval. Fig. 2S Influent and effluent COD (A) and BOD5 (B) average values of the hybrid biofilter and the hybrid polarized biofilter. Error bars represent 95% confidence interval. Fig. 3S Redox potential measured in the coke and the gravel biofilters Fig. 4S Rarefaction curves calculated for each sample based on the OTU computations. Fig. 5S Correspondence analysis biplot of classes’ distribution from pyrosequencing analysis. Fig. 6S. Relative abundance of classes of the category ‘other’ at class level. Table 1S Influent pre-treated wastewater and effluents characteristics. Averages ± SD HRT (d) 4.0 3.4 1.7 0.8 0.5 Influent COD (mg L-1) 246 ± 114 330 ± 107 457 ± 92 318 ± 143 393 ± 101 -1 BOD5 (mg L ) 136 ± 86 235 ± 36 268 ± 81 176 ± 127 213 ± 112 TN (mg L-1) 45.0 ± 17.4 60.6 ± 7.5 57.7 ± 3.9 43.7 ± 16.5 54.8 ± 10.1 -1 NH4-N (mg L ) 32.7 ± 18.7 51.6 ± 6.5 49.0 ± 2.3 36.6 ± 15.9 47.0 ± 8.8 -1 NO3-N (mg L ) 2.3 ± 3.6 1.0 ± 1.6 0.8 ± 0.6 1.5 ± 2.0 0.9 ± 0.6 TP (mg -
Recurring Patterns in Bacterioplankton Dynamics During Coastal Spring
RESEARCH ARTICLE Recurring patterns in bacterioplankton dynamics during coastal spring algae blooms Hanno Teeling1*†, Bernhard M Fuchs1*†, Christin M Bennke1‡, Karen Kru¨ ger1, Meghan Chafee1, Lennart Kappelmann1, Greta Reintjes1, Jost Waldmann1, Christian Quast1, Frank Oliver Glo¨ ckner1, Judith Lucas2, Antje Wichels2, Gunnar Gerdts2, Karen H Wiltshire3, Rudolf I Amann1* 1Max Planck Institute for Marine Microbiology, Bremen, Germany; 2Biologische Anstalt Helgoland, Alfred Wegener Institute for Polar and Marine Research, Helgoland, Germany; 3Alfred Wegener Institute for Polar and Marine Research, List auf Sylt, Germany Abstract A process of global importance in carbon cycling is the remineralization of algae biomass by heterotrophic bacteria, most notably during massive marine algae blooms. Such blooms can trigger secondary blooms of planktonic bacteria that consist of swift successions of distinct *For correspondence: hteeling@ mpi-bremen.de (HT); bfuchs@mpi- bacterial clades, most prominently members of the Flavobacteriia, Gammaproteobacteria and the bremen.de (BMF); ramann@mpi- alphaproteobacterial Roseobacter clade. We investigated such successions during spring bremen.de (RIA) phytoplankton blooms in the southern North Sea (German Bight) for four consecutive years. Dense sampling and high-resolution taxonomic analyses allowed the detection of recurring patterns down † These authors contributed to the genus level. Metagenome analyses also revealed recurrent patterns at the functional level, in equally to this work particular with respect to algal polysaccharide degradation genes. We, therefore, hypothesize that Present address: ‡Section even though there is substantial inter-annual variation between spring phytoplankton blooms, the Biology, Leibniz Institute for accompanying succession of bacterial clades is largely governed by deterministic principles such as Baltic Sea Research, substrate-induced forcing. -
D 3111 Suppl
The following supplement accompanies the article Fine-scale transition to lower bacterial diversity and altered community composition precedes shell disease in laboratory-reared juvenile American lobster Sarah G. Feinman, Andrea Unzueta Martínez, Jennifer L. Bowen, Michael F. Tlusty* *Corresponding author: [email protected] Diseases of Aquatic Organisms 124: 41–54 (2017) Figure S1. Principal coordinates analysis of bacterial communities on lobster shell samples taken on different days. Principal coordinates analysis of the weighted UniFrac metric comparing bacterial community composition of diseased lobster shell on different days of sampling. Diseased lobster shell includes samples collected from the site of disease (square), as well as 0.5 cm (circle), 1 cm (triangle), and 1.5 cm (diamond) away from the site of the disease, while colors depict different days of sampling. Note that by day four, two of the lobsters had molted, hence there are fewer red symbols 1 Figure S2. Rank relative abundance curve for the 200+ most abundant OTUs for each shell condition. The number of OTUs, their abundance, and their order varies for each bar graph based on the relative abundance of each OTU in that shell condition. Please note the difference in scale along the y-axis for each bar graph. Bars appear in color if the OTU is a part of the core microbiome of that shell condition or appear in black if the OTU is not a part of the core microbiome of that shell condition. Dotted lines indicate OTUs that are part of the “abundant microbiome,” i.e. those whose cumulative total is ~50%, as well as OTUs that are a part of the “rare microbiome,” i.e. -
The Gut Microbiome of the Sea Urchin, Lytechinus Variegatus, from Its Natural Habitat Demonstrates Selective Attributes of Micro
FEMS Microbiology Ecology, 92, 2016, fiw146 doi: 10.1093/femsec/fiw146 Advance Access Publication Date: 1 July 2016 Research Article RESEARCH ARTICLE The gut microbiome of the sea urchin, Lytechinus variegatus, from its natural habitat demonstrates selective attributes of microbial taxa and predictive metabolic profiles Joseph A. Hakim1,†, Hyunmin Koo1,†, Ranjit Kumar2, Elliot J. Lefkowitz2,3, Casey D. Morrow4, Mickie L. Powell1, Stephen A. Watts1,∗ and Asim K. Bej1,∗ 1Department of Biology, University of Alabama at Birmingham, 1300 University Blvd, Birmingham, AL 35294, USA, 2Center for Clinical and Translational Sciences, University of Alabama at Birmingham, Birmingham, AL 35294, USA, 3Department of Microbiology, University of Alabama at Birmingham, Birmingham, AL 35294, USA and 4Department of Cell, Developmental and Integrative Biology, University of Alabama at Birmingham, 1918 University Blvd., Birmingham, AL 35294, USA ∗Corresponding authors: Department of Biology, University of Alabama at Birmingham, 1300 University Blvd, CH464, Birmingham, AL 35294-1170, USA. Tel: +1-(205)-934-8308; Fax: +1-(205)-975-6097; E-mail: [email protected]; [email protected] †These authors contributed equally to this work. One sentence summary: This study describes the distribution of microbiota, and their predicted functional attributes, in the gut ecosystem of sea urchin, Lytechinus variegatus, from its natural habitat of Gulf of Mexico. Editor: Julian Marchesi ABSTRACT In this paper, we describe the microbial composition and their predictive metabolic profile in the sea urchin Lytechinus variegatus gut ecosystem along with samples from its habitat by using NextGen amplicon sequencing and downstream bioinformatics analyses. The microbial communities of the gut tissue revealed a near-exclusive abundance of Campylobacteraceae, whereas the pharynx tissue consisted of Tenericutes, followed by Gamma-, Alpha- and Epsilonproteobacteria at approximately equal capacities.