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Borchert E, Knobloch S, Dwyer E, Flynn S, Jackson SA, Jóhannsson R, Marteinsson VT, O'Gara F, Dobson ADW. Biotechnological Potential of Cold Adapted Pseudoalteromonas spp. Isolated from 'Deep Sea' Sponges. Mar Drugs 2017. [PMID: 28629190 PMCID: PMC5484134 DOI: 10.3390/md15060184] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
The marine genus Pseudoalteromonas is known for its versatile biotechnological potential with respect to the production of antimicrobials and enzymes of industrial interest. We have sequenced the genomes of three Pseudoalteromonas sp. strains isolated from different deep sea sponges on the Illumina MiSeq platform. The isolates have been screened for various industrially important enzymes and comparative genomics has been applied to investigate potential relationships between the isolates and their host organisms, while comparing them to free-living Pseudoalteromonas spp. from shallow and deep sea environments. The genomes of the sponge associated Pseudoalteromonas strains contained much lower levels of potential eukaryotic-like proteins which are known to be enriched in symbiotic sponge associated microorganisms, than might be expected for true sponge symbionts. While all the Pseudoalteromonas shared a large distinct subset of genes, nonetheless the number of unique and accessory genes is quite large and defines the pan-genome as open. Enzymatic screens indicate that a vast array of enzyme activities is expressed by the isolates, including β-galactosidase, β-glucosidase, and protease activities. A β-glucosidase gene from one of the Pseudoalteromonas isolates, strain EB27 was heterologously expressed in Escherichia coli and, following biochemical characterization, the recombinant enzyme was found to be cold-adapted, thermolabile, halotolerant, and alkaline active.
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Affiliation(s)
- Erik Borchert
- School of Microbiology, University College Cork, National University of Ireland, Cork T12 YN60, Ireland.
| | - Stephen Knobloch
- Department of Research and Innovation, Matís ohf., Reykjavik 113, Iceland.
| | - Emilie Dwyer
- School of Microbiology, University College Cork, National University of Ireland, Cork T12 YN60, Ireland.
| | - Sinéad Flynn
- School of Microbiology, University College Cork, National University of Ireland, Cork T12 YN60, Ireland.
| | - Stephen A Jackson
- School of Microbiology, University College Cork, National University of Ireland, Cork T12 YN60, Ireland.
| | - Ragnar Jóhannsson
- Department of Research and Innovation, Matís ohf., Reykjavik 113, Iceland.
| | | | - Fergal O'Gara
- School of Microbiology, University College Cork, National University of Ireland, Cork T12 YN60, Ireland.
- Biomerit Research Centre, University College Cork, National University of Ireland, Cork T12 YN60, Ireland.
- School of Biomedical Sciences, Curtin Health Innovation Research Institute, Curtin University, Perth 6102, WA, Australia.
| | - Alan D W Dobson
- School of Microbiology, University College Cork, National University of Ireland, Cork T12 YN60, Ireland.
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Single-cell analysis reveals gene-expression heterogeneity in syntrophic dual-culture of Desulfovibrio vulgaris with Methanosarcina barkeri. Sci Rep 2014; 4:7478. [PMID: 25504148 PMCID: PMC4265775 DOI: 10.1038/srep07478] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2014] [Accepted: 11/25/2014] [Indexed: 01/09/2023] Open
Abstract
Microbial syntrophic metabolism has been well accepted as the heart of how methanogenic and other anaerobic microbial communities function. In this work, we applied a single-cell RT-qPCR approach to reveal gene-expression heterogeneity in a model syntrophic system of Desulfovibrio vulgaris and Methanosarcina barkeri, as compared with the D. vulgaris monoculture. Using the optimized primers and single-cell analytical protocol, we quantitatively determine gene-expression levels of 6 selected target genes in each of the 120 single cells of D. vulgaris isolated from its monoculture and dual-culture with M. barkeri. The results demonstrated very significant cell-to-cell gene-expression heterogeneity for the selected D. vulgaris genes in both the monoculture and the syntrophic dual-culture. Interestingly, no obvious increase in gene-expression heterogeneity for the selected genes was observed for the syntrophic dual-culture when compared with its monoculture, although the community structure and cell-cell interactions have become more complicated in the syntrophic dual-culture. In addition, the single-cell RT-qPCR analysis also provided further evidence that the gene cluster (DVU0148-DVU0150) may be involved syntrophic metabolism between D. vulgaris and M. barkeri. Finally, the study validated that single-cell RT-qPCR analysis could be a valuable tool in deciphering gene functions and metabolism in mixed-cultured microbial communities.
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Bayer K, Kamke J, Hentschel U. Quantification of bacterial and archaeal symbionts in high and low microbial abundance sponges using real-time PCR. FEMS Microbiol Ecol 2014; 89:679-90. [PMID: 24942664 DOI: 10.1111/1574-6941.12369] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2014] [Revised: 06/06/2014] [Accepted: 06/10/2014] [Indexed: 12/28/2022] Open
Abstract
In spite of considerable insights into the microbial diversity of marine sponges, quantitative information on microbial abundances and community composition remains scarce. Here, we established qPCR assays for the specific quantification of four bacterial phyla of representative sponge symbionts as well as the kingdoms Eubacteria and Archaea. We could show that the 16S rRNA gene numbers of Archaea, Chloroflexi, and the candidate phylum Poribacteria were 4-6 orders of magnitude higher in high microbial abundance (HMA) than in low microbial abundance (LMA) sponges and that actinobacterial 16S rRNA gene numbers were 1-2 orders higher in HMA over LMA sponges, while those for Cyanobacteria were stable between HMA and LMA sponges. Fluorescence in situ hybridization of Aplysina aerophoba tissue sections confirmed the numerical dominance of Chloroflexi, which was followed by Poribacteria. Archaeal and actinobacterial cells were detected in much lower numbers. By use of fluorescence-activated cell sorting as a primer- and probe-independent approach, the dominance of Chloroflexi, Proteobacteria, and Poribacteria in A. aerophoba was confirmed. Our study provides new quantitative insights into the microbiology of sponges and contributes to a better understanding of the HMA/LMA dichotomy.
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Affiliation(s)
- Kristina Bayer
- Department of Botany II, Julius-von-Sachs Institute for Biological Sciences, University of Wuerzburg, Wuerzburg, Germany
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Kamke J, Rinke C, Schwientek P, Mavromatis K, Ivanova N, Sczyrba A, Woyke T, Hentschel U. The candidate phylum Poribacteria by single-cell genomics: new insights into phylogeny, cell-compartmentation, eukaryote-like repeat proteins, and other genomic features. PLoS One 2014; 9:e87353. [PMID: 24498082 PMCID: PMC3909097 DOI: 10.1371/journal.pone.0087353] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2013] [Accepted: 12/19/2013] [Indexed: 01/02/2023] Open
Abstract
The candidate phylum Poribacteria is one of the most dominant and widespread members of the microbial communities residing within marine sponges. Cell compartmentalization had been postulated along with their discovery about a decade ago and their phylogenetic association to the Planctomycetes, Verrucomicrobia, Chlamydiae superphylum was proposed soon thereafter. In the present study we revised these features based on genomic data obtained from six poribacterial single cells. We propose that Poribacteria form a distinct monophyletic phylum contiguous to the PVC superphylum together with other candidate phyla. Our genomic analyses supported the possibility of cell compartmentalization in form of bacterial microcompartments. Further analyses of eukaryote-like protein domains stressed the importance of such proteins with features including tetratricopeptide repeats, leucin rich repeats as well as low density lipoproteins receptor repeats, the latter of which are reported here for the first time from a sponge symbiont. Finally, examining the most abundant protein domain family on poribacterial genomes revealed diverse phyH family proteins, some of which may be related to dissolved organic posphorus uptake.
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Affiliation(s)
- Janine Kamke
- Department of Botany II, Julius-von-Sachs Institute for Biological Sciences, University of Wuerzburg, Wuerzburg, Germany
| | - Christian Rinke
- Department of Energy Joint Genome Institute, Walnut Creek, California, United States of America
| | - Patrick Schwientek
- Department of Energy Joint Genome Institute, Walnut Creek, California, United States of America
| | - Kostas Mavromatis
- Department of Energy Joint Genome Institute, Walnut Creek, California, United States of America
| | - Natalia Ivanova
- Department of Energy Joint Genome Institute, Walnut Creek, California, United States of America
| | - Alexander Sczyrba
- Department of Energy Joint Genome Institute, Walnut Creek, California, United States of America
- Center for Biotechnology, Bielefeld University, Bielefeld, Germany
| | - Tanja Woyke
- Department of Energy Joint Genome Institute, Walnut Creek, California, United States of America
| | - Ute Hentschel
- Department of Botany II, Julius-von-Sachs Institute for Biological Sciences, University of Wuerzburg, Wuerzburg, Germany
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Metagenomic approaches for exploiting uncultivated bacteria as a resource for novel biosynthetic enzymology. ACTA ACUST UNITED AC 2013; 20:636-47. [PMID: 23706630 DOI: 10.1016/j.chembiol.2013.04.011] [Citation(s) in RCA: 109] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2013] [Revised: 03/28/2013] [Accepted: 04/16/2013] [Indexed: 12/24/2022]
Abstract
Most biologically active microbial natural products are known from strains that can be isolated and cultivated in the laboratory. However, the genomics era has revealed that cultured bacteria represent a mere fraction of total estimated bacterial biodiversity. With the development of community genomics, termed metagenomics, the uncultivated majority became accessible for functional analysis. Through metagenomic studies, novel biocatalysts and biosynthetic pathways are being discovered at a pace previously not possible using traditional molecular biology techniques. Additionally, the study of uncultivated bacteria has provided valuable insights into previously overlooked biocatalysts from cultured strains. This perspective highlights recent discoveries from metagenomics of uncultivated bacteria and discusses the impact of those findings on the field of natural products.
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Ellegaard KM, Klasson L, Andersson SGE. Testing the reproducibility of multiple displacement amplification on genomes of clonal endosymbiont populations. PLoS One 2013; 8:e82319. [PMID: 24312412 PMCID: PMC3842359 DOI: 10.1371/journal.pone.0082319] [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: 08/16/2013] [Accepted: 10/31/2013] [Indexed: 12/11/2022] Open
Abstract
The multiple displacement amplification method has revolutionized genomic studies of uncultured bacteria, where the extraction of pure DNA in sufficient quantity for next-generation sequencing is challenging. However, the method is problematic in that it amplifies the target DNA unevenly, induces the formation of chimeric reads and also amplifies contaminating DNA. Here, we have tested the reproducibility of the multiple displacement amplification method using serial dilutions of extracted genomic DNA and intact cells from the cultured endosymbiont Bartonella australis. The amplified DNA was sequenced with the Illumina sequencing technology, and the results were compared to sequence data obtained from unamplified DNA in this study as well as from a previously published genome project. We show that artifacts such as the extent of the amplification bias, the percentage of chimeric reads and the relative fraction of contaminating DNA increase dramatically for the smallest amounts of template DNA. The pattern of read coverage was reproducibly obtained for samples with higher amounts of template DNA, suggesting that the bias is non-random and genome-specific. A re-analysis of previously published sequence data obtained after amplification from clonal endosymbiont populations confirmed these predictions. We conclude that many of the artifacts associated with the use of the multiple displacement amplification method can be alleviated or much reduced by using multiple cells as the template for the amplification. These findings should be particularly useful for researchers studying the genomes of endosymbionts and other uncultured bacteria, for which a small clonal population of cells can be isolated.
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Affiliation(s)
- Kirsten Maren Ellegaard
- Department of Molecular Evolution, Cell and Molecular Biology, Science for Life Laboratory, Biomedical Centre, Uppsala University, Uppsala, Sweden
| | - Lisa Klasson
- Department of Molecular Evolution, Cell and Molecular Biology, Science for Life Laboratory, Biomedical Centre, Uppsala University, Uppsala, Sweden
| | - Siv G. E. Andersson
- Department of Molecular Evolution, Cell and Molecular Biology, Science for Life Laboratory, Biomedical Centre, Uppsala University, Uppsala, Sweden
- * E-mail:
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Single-cell genomics reveals complex carbohydrate degradation patterns in poribacterial symbionts of marine sponges. ISME JOURNAL 2013; 7:2287-300. [PMID: 23842652 DOI: 10.1038/ismej.2013.111] [Citation(s) in RCA: 82] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/26/2013] [Revised: 06/04/2013] [Accepted: 06/04/2013] [Indexed: 01/05/2023]
Abstract
Many marine sponges are hosts to dense and phylogenetically diverse microbial communities that are located in the extracellular matrix of the animal. The candidate phylum Poribacteria is a predominant member of the sponge microbiome and its representatives are nearly exclusively found in sponges. Here we used single-cell genomics to obtain comprehensive insights into the metabolic potential of individual poribacterial cells representing three distinct phylogenetic groups within Poribacteria. Genome sizes were up to 5.4 Mbp and genome coverage was as high as 98.5%. Common features of the poribacterial genomes indicated that heterotrophy is likely to be of importance for this bacterial candidate phylum. Carbohydrate-active enzyme database screening and further detailed analysis of carbohydrate metabolism suggested the ability to degrade diverse carbohydrate sources likely originating from seawater and from the host itself. The presence of uronic acid degradation pathways as well as several specific sulfatases provides strong support that Poribacteria degrade glycosaminoglycan chains of proteoglycans, which are important components of the sponge host matrix. Dominant glycoside hydrolase families further suggest degradation of other glycoproteins in the host matrix. We therefore propose that Poribacteria are well adapted to an existence in the sponge extracellular matrix. Poribacteria may be viewed as efficient scavengers and recyclers of a particular suite of carbon compounds that are unique to sponges as microbial ecosystems.
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Blainey PC. The future is now: single-cell genomics of bacteria and archaea. FEMS Microbiol Rev 2013; 37:407-27. [PMID: 23298390 PMCID: PMC3878092 DOI: 10.1111/1574-6976.12015] [Citation(s) in RCA: 196] [Impact Index Per Article: 17.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2012] [Revised: 11/28/2012] [Accepted: 12/20/2012] [Indexed: 01/08/2023] Open
Abstract
Interest in the expanding catalog of uncultivated microorganisms, increasing recognition of heterogeneity among seemingly similar cells, and technological advances in whole-genome amplification and single-cell manipulation are driving considerable progress in single-cell genomics. Here, the spectrum of applications for single-cell genomics, key advances in the development of the field, and emerging methodology for single-cell genome sequencing are reviewed by example with attention to the diversity of approaches and their unique characteristics. Experimental strategies transcending specific methodologies are identified and organized as a road map for future studies in single-cell genomics of environmental microorganisms. Over the next decade, increasingly powerful tools for single-cell genome sequencing and analysis will play key roles in accessing the genomes of uncultivated organisms, determining the basis of microbial community functions, and fundamental aspects of microbial population biology.
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Stepanauskas R. Single cell genomics: an individual look at microbes. Curr Opin Microbiol 2012; 15:613-20. [PMID: 23026140 DOI: 10.1016/j.mib.2012.09.001] [Citation(s) in RCA: 159] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2012] [Accepted: 09/12/2012] [Indexed: 12/18/2022]
Abstract
Single cell genomics (SCG) uncovers hereditary information at the most basic level of biological organization. It is emerging as a powerful complement to cultivation-based and microbial community-focused research approaches. SCG has been instrumental in identifying metabolic features, evolutionary histories and inter-organismal interactions of the uncultured microbial groups that dominate many environments and biogeochemical cycles. The SCG approach also holds great promise in microbial microevolution studies and industrial bioprospecting. Methods for SCG consist of a series of integrated processes, beginning with the collection and preservation of environmental samples, followed by physical separation, lysis and whole genome amplification of individual cells, and culminating in genomic sequencing and the inference of encoded biological features.
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