101
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Jose PA, Jha B. Intertidal marine sediment harbours Actinobacteria with promising bioactive and biosynthetic potential. Sci Rep 2017; 7:10041. [PMID: 28855551 PMCID: PMC5577230 DOI: 10.1038/s41598-017-09672-6] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2016] [Accepted: 07/28/2017] [Indexed: 11/29/2022] Open
Abstract
Actinobacteria are the major source of bioactive natural products that find their value in research and drug discovery programmes. Antimicrobial resistance and the resulting high demand for novel antibiotics underscore the need for exploring novel sources of these bacteria endowed with biosynthetic potential. Intertidal ecosystems endure regular periods of immersion and emersion, and represent an untapped source of Actinobacteria. In this study, we studied the diversity and biosynthetic potential of cultivable Actinobacteria from intertidal sediments of Diu Island in the Arabian Sea. A total of 148 Actinobacteria were selectively isolated using a stamping method with eight isolation media. Isolates were grouped into OTUs based on their 16S rRNA gene sequence, and categorized within actinobacterial families such as Glycomycetaceae, Micromonosporaceae, Nocardiaceae, Nocardiopsaceae, Pseudonocardiaceae, Streptomycetaceae, and Thermomonosporaceae. The biosynthetic potential of the Actinobacteria, necessary for secondary metabolite biosynthesis, was screened and confirmed by extensive fingerprinting approaches based on genes coding for polyketide synthases and nonribosomal peptide synthetases. The observed biosynthetic potential was correlated with the antibacterial activity exhibited by these isolates in laboratory conditions. Ultimately, the results demonstrate that intertidal sediment is a rich source of diverse cultivable Actinobacteria with high potential to synthesize novel bioactive compounds in their genomes.
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Affiliation(s)
- Polpass Arul Jose
- Marine Biotechnology and Ecology Division, CSIR- Central Salt and Marine Chemicals Research Institute, G. B. Marg, Bhavnagar - 364002, Gujarat, India.
| | - Bhavanath Jha
- Marine Biotechnology and Ecology Division, CSIR- Central Salt and Marine Chemicals Research Institute, G. B. Marg, Bhavnagar - 364002, Gujarat, India. .,Academy of Scientific and Innovative Research (AcSIR), Council of Scientific and Industrial Research (CSIR), New Delhi, India.
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102
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Ramadan Y, Amro H, Nora F, Khaled AA. Quorum sensing signal production by sponge-associated bacteria isolated from the Red Sea, Egypt. ACTA ACUST UNITED AC 2017. [DOI: 10.5897/ajb2017.16078] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
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103
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Wang D, Wang C, Gui P, Liu H, Khalaf SMH, Elsayed EA, Wadaan MAM, Hozzein WN, Zhu W. Identification, Bioactivity, and Productivity of Actinomycins from the Marine-Derived Streptomyces heliomycini. Front Microbiol 2017; 8:1147. [PMID: 28702007 PMCID: PMC5487404 DOI: 10.3389/fmicb.2017.01147] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2017] [Accepted: 06/07/2017] [Indexed: 11/13/2022] Open
Abstract
In the process of profiling the secondary metabolites of actinobacteria isolated from the Saudi coastal habitats for production of antibiotics and anti-cancer drugs, the cultures of strain WH1 that was identified as Streptomyces heliomycini exhibited strong antibacterial activity against Staphylococcus aureus. By means of MS and NMR techniques, the active compounds were characterized as actinomycins X0β, X2, and D, respectively. The research on the productivity of this strain for actinomycins revealed that the highest production of actinomycins X0β, X2, and D was reached in the medium MII within 5% salinity and pH 8.5. In this optimized condition, the fermentation titers of actinomycins X0β, X2, and D were 107.6 ± 4.2, 283.4 ± 75.3, and 458.0 ± 76.3 mg/L, respectively. All the three actinomycins X0β, X2, and D showed potent cytotoxicities against the MCF-7, K562, and A549 tumor cell lines, in which actinomycin X2 was the most active against the three tumor cell lines with the IC50 values of 0.8-1.8 nM. Both actinomycins X2 and D showed potent antibacterial activities against S. aureus and the methicillin-resistant S. aureus, Bacillus subtilis, and B. cereus and the actinomycin X2 was more potent.
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Affiliation(s)
- Dongyang Wang
- Key Laboratory of Marine Drugs, MEC, School of Medicine and Pharmacy, Ocean University of ChinaQingdao, China
| | - Cong Wang
- Key Laboratory of Marine Drugs, MEC, School of Medicine and Pharmacy, Ocean University of ChinaQingdao, China
| | - Pengyan Gui
- Key Laboratory of Marine Drugs, MEC, School of Medicine and Pharmacy, Ocean University of ChinaQingdao, China
| | - Haishan Liu
- Key Laboratory of Marine Drugs, MEC, School of Medicine and Pharmacy, Ocean University of ChinaQingdao, China
| | - Sameh M. H. Khalaf
- Bioproducts Research Chair, Zoology Department, College of Science, King Saud UniversityRiyadh, Saudi Arabi
| | - Elsayed A. Elsayed
- Bioproducts Research Chair, Zoology Department, College of Science, King Saud UniversityRiyadh, Saudi Arabi
- Natural and Microbial Products Deptartment, National Research Centre, DokkiCairo, Egypt
| | - Mohammed A. M. Wadaan
- Bioproducts Research Chair, Zoology Department, College of Science, King Saud UniversityRiyadh, Saudi Arabi
| | - Wael N. Hozzein
- Bioproducts Research Chair, Zoology Department, College of Science, King Saud UniversityRiyadh, Saudi Arabi
- Botany and Microbiology Department, Faculty of Science, Beni-Suef UniversityBeni-Suef, Egypt
| | - Weiming Zhu
- Key Laboratory of Marine Drugs, MEC, School of Medicine and Pharmacy, Ocean University of ChinaQingdao, China
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104
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El-Nekeety AA, Salman AS, Hathout AS, Sabry BA, Abdel-Aziem SH, Hassan NS, Abdel-Wahhab MA. Evaluation of the bioactive extract of actinomyces isolated from the Egyptian environment against aflatoxin B 1-induce cytotoxicity, genotoxicity and oxidative stress in the liver of rats. Food Chem Toxicol 2017; 105:241-255. [PMID: 28442411 DOI: 10.1016/j.fct.2017.04.024] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2017] [Revised: 04/18/2017] [Accepted: 04/20/2017] [Indexed: 01/15/2023]
Abstract
This study aimed to determine the bioactive compounds of actinomyces (ACT) isolated from the Egyptian environment (D-EGY) and to evaluate their protective activity against AFB1 in female Sprague-Dawley rats. Six groups of animals were treated orally for 3 weeks included: C, the control group, T1, AFB1-treated group (80 μg/kg b.w), T2 and T3, the groups received ACT extract at low (25 mg/kg b.w) or high (50 mg/kg b.w) doses, T4 and T5, the groups received AFB1 plus the low or high dose of ACT extract. Blood, bone marrow and tissue samples were collected for different analyses and histological examination. The results revealed the identification of 40 components, representing 99.98%. Treatment with AFB1 disturbs liver function parameters, oxidative stress markers, antioxidant gene expressions, DNA fragmentation and induced severe histological changes. ACT extract at the low or high doses did not induce significant changes in all the tested parameters or histological picture of the liver. Moreover, ACT extract succeeded to induce a significant protection against the toxicity of AFB1. It could be concluded that the bioactive compounds in ACT are promise candidate for the development of food additive or drugs for the protection and treatment of liver disorders in the endemic area.
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Affiliation(s)
- Aziza A El-Nekeety
- Food Toxicology & Contaminants Department, National Research Center, Dokki, Cairo, Egypt
| | - Asmaa S Salman
- Genetic and Cytology Department, National Research Center, Dokki, Cairo, Egypt
| | - Amal S Hathout
- Food Toxicology & Contaminants Department, National Research Center, Dokki, Cairo, Egypt
| | - Bassem A Sabry
- Food Toxicology & Contaminants Department, National Research Center, Dokki, Cairo, Egypt
| | | | - Nabila S Hassan
- Pathology Department, National Research Center, Dokki, Cairo, Egypt
| | - Mosaad A Abdel-Wahhab
- Food Toxicology & Contaminants Department, National Research Center, Dokki, Cairo, Egypt.
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105
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Undabarrena A, Ugalde JA, Seeger M, Cámara B. -Genomic data mining of the marine actinobacteria Streptomyces sp. H-KF8 unveils insights into multi-stress related genes and metabolic pathways involved in antimicrobial synthesis. PeerJ 2017; 5:e2912. [PMID: 28229018 PMCID: PMC5312570 DOI: 10.7717/peerj.2912] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2016] [Accepted: 12/14/2016] [Indexed: 12/25/2022] Open
Abstract
Streptomyces sp. H-KF8 is an actinobacterial strain isolated from marine sediments of a Chilean Patagonian fjord. Morphological characterization together with antibacterial activity was assessed in various culture media, revealing a carbon-source dependent activity mainly against Gram-positive bacteria (S. aureus and L. monocytogenes). Genome mining of this antibacterial-producing bacterium revealed the presence of 26 biosynthetic gene clusters (BGCs) for secondary metabolites, where among them, 81% have low similarities with known BGCs. In addition, a genomic search in Streptomyces sp. H-KF8 unveiled the presence of a wide variety of genetic determinants related to heavy metal resistance (49 genes), oxidative stress (69 genes) and antibiotic resistance (97 genes). This study revealed that the marine-derived Streptomyces sp. H-KF8 bacterium has the capability to tolerate a diverse set of heavy metals such as copper, cobalt, mercury, chromate and nickel; as well as the highly toxic tellurite, a feature first time described for Streptomyces. In addition, Streptomyces sp. H-KF8 possesses a major resistance towards oxidative stress, in comparison to the soil reference strain Streptomyces violaceoruber A3(2). Moreover, Streptomyces sp. H-KF8 showed resistance to 88% of the antibiotics tested, indicating overall, a strong response to several abiotic stressors. The combination of these biological traits confirms the metabolic versatility of Streptomyces sp. H-KF8, a genetically well-prepared microorganism with the ability to confront the dynamics of the fjord-unique marine environment.
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Affiliation(s)
- Agustina Undabarrena
- Departmento de Química & Centro de Biotecnología, Universidad Técnica Federico Santa María , Valparaiso , Chile
| | - Juan A Ugalde
- Centro de Genética y Genómica, Facultad de Medicina Clinica Alemana, Universidad del Desarrollo , Santiago , Chile
| | - Michael Seeger
- Departmento de Química & Centro de Biotecnología, Universidad Técnica Federico Santa María , Valparaiso , Chile
| | - Beatriz Cámara
- Departmento de Química & Centro de Biotecnología, Universidad Técnica Federico Santa María , Valparaiso , Chile
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106
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Classical Optimization of Cellulase and Xylanase Production by a Marine Streptomyces Species. APPLIED SCIENCES-BASEL 2016. [DOI: 10.3390/app6100286] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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107
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The role of sponge-bacteria interactions: the sponge Aplysilla rosea challenged by its associated bacterium Streptomyces ACT-52A in a controlled aquarium system. Appl Microbiol Biotechnol 2016; 100:10609-10626. [PMID: 27717966 DOI: 10.1007/s00253-016-7878-9] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2016] [Revised: 09/05/2016] [Accepted: 09/16/2016] [Indexed: 10/20/2022]
Abstract
Sponge-associated bacteria play a critical role in sponge biology, metabolism and ecology, but how they interact with their host sponges and the role of these interactions are poorly understood. This study investigated the role of the interaction between the sponge Aplysilla rosea and its associated actinobacterium, Streptomyces ACT-52A, in modifying sponge microbial diversity, metabolite profile and bioactivity. A recently developed experimental approach that exposes sponges to bacteria of interest in a controlled aquarium system was improved by including the capture and analysis of secreted metabolites by the addition of an absorbent resin in the seawater. In a series of controlled aquaria, A. rosea was exposed to Streptomyces ACT-52A at 106 cfu/ml and monitored for up to 360 h. Shifts in microbial communities associated with the sponges occurred within 24 to 48 h after bacterial exposure and continued until 360 h, as revealed by TRFLP. The metabolite profiles of sponge tissues also changed substantially as the microbial community shifted. Control sponges (without added bacteria) and Streptomyces ACT-52A-exposed sponges released different metabolites into the seawater that was captured by the resin. The antibacterial activity of compounds collected from the seawater increased at 96 and 360 h of exposure for the treated sponges compared to the control group due to new compounds being produced and released. Increased antibacterial activity of metabolites from treated sponge tissue was observed only at 360 h, whereas that of control sponge tissue remained unchanged. The results demonstrate that the interaction between sponges and their associated bacteria plays an important role in regulating secondary metabolite production.
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108
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Pang KL, Overy DP, Jones EG, Calado MDL, Burgaud G, Walker AK, Johnson JA, Kerr RG, Cha HJ, Bills GF. ‘Marine fungi’ and ‘marine-derived fungi’ in natural product chemistry research: Toward a new consensual definition. FUNGAL BIOL REV 2016. [DOI: 10.1016/j.fbr.2016.08.001] [Citation(s) in RCA: 51] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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109
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Talukdar M, Das D, Bora C, Bora TC, Deka Boruah HP, Singh AK. Complete genome sequencing and comparative analyses of broad-spectrum antimicrobial-producing Micromonospora sp. HK10. Gene 2016; 594:97-107. [PMID: 27609432 DOI: 10.1016/j.gene.2016.09.005] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2015] [Revised: 08/29/2016] [Accepted: 09/02/2016] [Indexed: 01/21/2023]
Abstract
Micromonospora genus produces >700 bioactive compounds of medical relevance. In spite of its ability to produce high number of bioactive compounds, no genome sequence is available with comprehensive secondary metabolite gene clusters analysis for anti-microbial producing Micromonospora strains. Thus, here we contribute the full genome sequence of Micromonospora sp. HK10 strain, which has high antibacterial activity against several important human pathogens like, Mycobacterium abscessus, Mycobacterium smegmatis, Bacillus subtillis, Staphylococcus aureus, Proteus vulgaris, Pseudomonas aeruginosa, Salmonella and Escherichia coli. We have generated whole genome sequence data of Micromonospora sp. HK10 strain using Illumina NexSeq 500 sequencing platform (2×150bp paired end library) and assembled it de novo. The sequencing of HK10 genome enables identification of various genetic clusters associated with known- and probably unknown- antimicrobial compounds, which can pave the way for new antimicrobial scaffolds.
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Affiliation(s)
- Madhumita Talukdar
- Department of Biotechnology, CSIR-North East Institute of Science and Technology, Jorhat 785006, India
| | - Dhrubajyoti Das
- Department of Biotechnology, CSIR-North East Institute of Science and Technology, Jorhat 785006, India
| | - Chiranjeeta Bora
- Department of Biotechnology, CSIR-North East Institute of Science and Technology, Jorhat 785006, India
| | - Tarun Chandra Bora
- Department of Biotechnology, CSIR-North East Institute of Science and Technology, Jorhat 785006, India
| | - Hari Prasanna Deka Boruah
- Department of Biotechnology, CSIR-North East Institute of Science and Technology, Jorhat 785006, India
| | - Anil Kumar Singh
- Department of Biotechnology, CSIR-North East Institute of Science and Technology, Jorhat 785006, India; Academy of Scientific and Innovative Research, Rafi Marg, New Delhi 110001, India.
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110
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Undabarrena A, Beltrametti F, Claverías FP, González M, Moore ERB, Seeger M, Cámara B. Exploring the Diversity and Antimicrobial Potential of Marine Actinobacteria from the Comau Fjord in Northern Patagonia, Chile. Front Microbiol 2016; 7:1135. [PMID: 27486455 PMCID: PMC4949237 DOI: 10.3389/fmicb.2016.01135] [Citation(s) in RCA: 60] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2016] [Accepted: 07/07/2016] [Indexed: 11/13/2022] Open
Abstract
Bioprospecting natural products in marine bacteria from fjord environments are attractive due to their unique geographical features. Although, Actinobacteria are well known for producing a myriad of bioactive compounds, investigations regarding fjord-derived marine Actinobacteria are scarce. In this study, the diversity and biotechnological potential of Actinobacteria isolated from marine sediments within the Comau fjord, in Northern Chilean Patagonia, were assessed by culture-based approaches. The 16S rRNA gene sequences revealed that members phylogenetically related to the Micrococcaceae, Dermabacteraceae, Brevibacteriaceae, Corynebacteriaceae, Microbacteriaceae, Dietziaceae, Nocardiaceae, and Streptomycetaceae families were present at the Comau fjord. A high diversity of cultivable Actinobacteria (10 genera) was retrieved by using only five different isolation media. Four isolates belonging to Arthrobacter, Brevibacterium, Corynebacterium and Kocuria genera showed 16S rRNA gene identity <98.7% suggesting that they are novel species. Physiological features such as salt tolerance, artificial sea water requirement, growth temperature, pigmentation and antimicrobial activity were evaluated. Arthrobacter, Brachybacterium, Curtobacterium, Rhodococcus, and Streptomyces isolates showed strong inhibition against both Gram-negative Pseudomonas aeruginosa, Escherichia coli and Salmonella enterica and Gram-positive Staphylococcus aureus, Listeria monocytogenes. Antimicrobial activities in Brachybacterium, Curtobacterium, and Rhodococcus have been scarcely reported, suggesting that non-mycelial strains are a suitable source of bioactive compounds. In addition, all strains bear at least one of the biosynthetic genes coding for NRPS (91%), PKS I (18%), and PKS II (73%). Our results indicate that the Comau fjord is a promising source of novel Actinobacteria with biotechnological potential for producing biologically active compounds.
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Affiliation(s)
- Agustina Undabarrena
- Laboratorio de Microbiología Molecular y Biotecnología Ambiental, Departamento de Química & Centro de Biotecnología Daniel Alkalay Lowitt, Universidad Técnica Federico Santa MaríaValparaíso, Chile
| | | | - Fernanda P. Claverías
- Laboratorio de Microbiología Molecular y Biotecnología Ambiental, Departamento de Química & Centro de Biotecnología Daniel Alkalay Lowitt, Universidad Técnica Federico Santa MaríaValparaíso, Chile
| | - Myriam González
- Laboratorio de Microbiología Molecular y Biotecnología Ambiental, Departamento de Química & Centro de Biotecnología Daniel Alkalay Lowitt, Universidad Técnica Federico Santa MaríaValparaíso, Chile
| | - Edward R. B. Moore
- Culture Collection University of Gothenburg (CCUG), Sahlgrenska Academy, University of GothenburgGothenburg, Sweden
- Department of Infectious Diseases, Sahlgrenska Academy, University of GothenburgGothenburg, Sweden
| | - Michael Seeger
- Laboratorio de Microbiología Molecular y Biotecnología Ambiental, Departamento de Química & Centro de Biotecnología Daniel Alkalay Lowitt, Universidad Técnica Federico Santa MaríaValparaíso, Chile
| | - Beatriz Cámara
- Laboratorio de Microbiología Molecular y Biotecnología Ambiental, Departamento de Química & Centro de Biotecnología Daniel Alkalay Lowitt, Universidad Técnica Federico Santa MaríaValparaíso, Chile
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111
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Lee J, Han C, Lee TG, Chin J, Choi H, Lee W, Paik MJ, Won DH, Jeong G, Ko J, Yoon YJ, Nam SJ, Fenical W, Kang H. Marinopyrones A–D, α-pyrones from marine-derived actinomycetes of the family Nocardiopsaceae. Tetrahedron Lett 2016. [DOI: 10.1016/j.tetlet.2016.03.084] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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112
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Next Generation Sequencing of Actinobacteria for the Discovery of Novel Natural Products. Mar Drugs 2016; 14:md14040078. [PMID: 27089350 PMCID: PMC4849082 DOI: 10.3390/md14040078] [Citation(s) in RCA: 85] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2016] [Revised: 04/01/2016] [Accepted: 04/06/2016] [Indexed: 12/17/2022] Open
Abstract
Like many fields of the biosciences, actinomycete natural products research has been revolutionised by next-generation DNA sequencing (NGS). Hundreds of new genome sequences from actinobacteria are made public every year, many of them as a result of projects aimed at identifying new natural products and their biosynthetic pathways through genome mining. Advances in these technologies in the last five years have meant not only a reduction in the cost of whole genome sequencing, but also a substantial increase in the quality of the data, having moved from obtaining a draft genome sequence comprised of several hundred short contigs, sometimes of doubtful reliability, to the possibility of obtaining an almost complete and accurate chromosome sequence in a single contig, allowing a detailed study of gene clusters and the design of strategies for refactoring and full gene cluster synthesis. The impact that these technologies are having in the discovery and study of natural products from actinobacteria, including those from the marine environment, is only starting to be realised. In this review we provide a historical perspective of the field, analyse the strengths and limitations of the most relevant technologies, and share the insights acquired during our genome mining projects.
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113
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Lyddiard D, Jones GL, Greatrex BW. Keeping it simple: lessons from the golden era of antibiotic discovery. FEMS Microbiol Lett 2016; 363:fnw084. [PMID: 27036144 DOI: 10.1093/femsle/fnw084] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/29/2016] [Indexed: 11/14/2022] Open
Abstract
Bacteria are becoming increasingly resistant to currently used antibiotics. At the same time, little progress has been made in discovering new antibacterial drugs to combat resistant organisms. History teaches us that 'high tech' target-based complex methods are not synonymous with success and a return to simple, systematic screening of natural products against bacteria from traditional and novel resources holds our greatest hope of success.
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Affiliation(s)
- Dane Lyddiard
- School of Science and Technology, University of New England, Armidale NSW 2351, Australia
| | - Graham L Jones
- School of Science and Technology, University of New England, Armidale NSW 2351, Australia
| | - Ben W Greatrex
- School of Science and Technology, University of New England, Armidale NSW 2351, Australia
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114
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Mahmoud HM, Kalendar AA. Coral-Associated Actinobacteria: Diversity, Abundance, and Biotechnological Potentials. Front Microbiol 2016; 7:204. [PMID: 26973601 PMCID: PMC4770044 DOI: 10.3389/fmicb.2016.00204] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2015] [Accepted: 02/08/2016] [Indexed: 11/29/2022] Open
Abstract
Marine Actinobacteria, particularly coral-associated Actinobacteria, have attracted attention recently. In this study, the abundance and diversity of Actinobacteria associated with three types of coral thriving in a thermally stressed coral reef system north of the Arabian Gulf were investigated. Coscinaraea columna, Platygyra daedalea and Porites harrisoni have been found to harbor equivalent numbers of culturable Actinobacteria in their tissues but not in their mucus. However, different culturable actinobacterial communities have been found to be associated with different coral hosts. Differences in the abundance and diversity of Actinobacteria were detected between the mucus and tissue of the same coral host. In addition, temporal and spatial variations in the abundance and diversity of the cultivable actinobacterial communities were detected. In total, 19 different actinobacterial genera, namely Micrococcus, Brachybacterium, Brevibacterium, Streptomyces, Micromonospora, Renibacterium, Nocardia, Microbacterium, Dietzia, Cellulomonas, Ornithinimicrobium, Rhodococcus, Agrococcus, Kineococcus, Dermacoccus, Devriesea, Kocuria, Marmoricola, and Arthrobacter, were isolated from the coral tissue and mucus samples. Furthermore, 82 isolates related to Micromonospora, Brachybacterium, Nocardia, Micrococcus, Arthrobacter, Rhodococcus, and Streptomyces showed antimicrobial activities against representative Gram-positive and/or Gram-negative bacteria. Even though Brevibacterium and Kocuria were the most dominant actinobacterial isolates, they failed to show any antimicrobial activity, whereas less dominant genera, such as Streptomyces, did show antimicrobial activity. Focusing on the diversity of coral-associated Actinobacteria may help to understand how corals thrive under harsh environmental conditions and may lead to the discovery of novel antimicrobial metabolites with potential biotechnological applications.
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Affiliation(s)
- Huda M Mahmoud
- Faculty of Science, Department of Biological Sciences, Kuwait University Safat, Kuwait
| | - Aisha A Kalendar
- Faculty of Science, Department of Biological Sciences, Kuwait University Safat, Kuwait
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115
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Using Molecular Networking for Microbial Secondary Metabolite Bioprospecting. Metabolites 2016; 6:metabo6010002. [PMID: 26761036 PMCID: PMC4812331 DOI: 10.3390/metabo6010002] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2015] [Revised: 12/23/2015] [Accepted: 12/30/2015] [Indexed: 01/02/2023] Open
Abstract
The oceans represent an understudied resource for the isolation of bacteria with the potential to produce novel secondary metabolites. In particular, actinomyces are well known to produce chemically diverse metabolites with a wide range of biological activities. This study characterised spore-forming bacteria from both Scottish and Antarctic sediments to assess the influence of isolation location on secondary metabolite production. Due to the selective isolation method used, all 85 isolates belonged to the phyla Firmicutes and Actinobacteria, with the majority of isolates belonging to the genera Bacillus and Streptomyces. Based on morphology, thirty-eight isolates were chosen for chemical investigation. Molecular networking based on chemical profiles (HR-MS/MS) of fermentation extracts was used to compare complex metabolite extracts. The results revealed 40% and 42% of parent ions were produced by Antarctic and Scottish isolated bacteria, respectively, and only 8% of networked metabolites were shared between these locations, implying a high degree of biogeographic influence upon secondary metabolite production. The resulting molecular network contained over 3500 parent ions with a mass range of m/z 149–2558 illustrating the wealth of metabolites produced. Furthermore, seven fermentation extracts showed bioactivity against epithelial colon adenocarcinoma cells, demonstrating the potential for the discovery of novel bioactive compounds from these understudied locations.
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116
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Actinobacteria and Myxobacteria—Two of the Most Important Bacterial Resources for Novel Antibiotics. Curr Top Microbiol Immunol 2016; 398:273-302. [DOI: 10.1007/82_2016_503] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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117
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Karuppiah V, Sun W, Li Z. Natural Products of Actinobacteria Derived from Marine Organisms. STUDIES IN NATURAL PRODUCTS CHEMISTRY 2016. [DOI: 10.1016/b978-0-444-63602-7.00013-8] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
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118
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Occurrence of Priming in the Degradation of Lignocellulose in Marine Sediments. PLoS One 2015; 10:e0143917. [PMID: 26633175 PMCID: PMC4669084 DOI: 10.1371/journal.pone.0143917] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2015] [Accepted: 11/11/2015] [Indexed: 11/23/2022] Open
Abstract
More than 50% of terrestrially-derived organic carbon (terrOC) flux from the continents to the ocean is remineralised in the coastal zone despite its perceived high refractivity. The efficient degradation of terrOC in the marine environment could be fuelled by labile marine-derived material, a phenomenon known as “priming effect”, but experimental data to confirm this mechanism are lacking. We tested this hypothesis by treating coastal sediments with 13C-lignocellulose, as a proxy for terrOC, with and without addition of unlabelled diatom detritus that served as the priming inducer. The occurrence of priming was assessed by the difference in lignocellulose mineralisation between diatom-amended treatments and controls in aerobic sediment slurries. Priming of lignocellulose degradation was observed only at the initial stages of the experiment (day 7) and coincided with overall high microbial activity as exemplified by total CO2 production. Lignocellulose mineralisation did not differ consistently between diatom treatments and control for the remaining experimental time (days 14–28). Based on this pattern, we hypothesize that the faster initiation of lignocellulose mineralisation in diatom-amended treatments is attributed to the decomposition of accessible polysaccharide components within the lignocellulose complex by activated diatom degraders. The fact that diatom-degraders contributed to lignocellulose degradation was also supported by the different patterns in 13C-enrichment of phospholipid fatty acids between treatments. Although we did not observe differences between treatments in the total quantity of respired lignocellulose at the end of the experiment, differences in timing could be important in natural ecosystems where the amount of time that a certain compound is subject to aerobic degradation before burial to deeper anoxic sediments may be limited.
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Juboi H, Basik AA, Shamsul SSG, Arnold P, Schmitt EK, Sanglier JJ, Yeo TC. Luteipulveratus halotolerans sp. nov., an actinobacterium (Dermacoccaceae) from forest soil. Int J Syst Evol Microbiol 2015; 65:4113-4120. [DOI: 10.1099/ijsem.0.000548] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The taxonomic position of an actinobacterium strain, C296001T, isolated from a soil sample collected in Sarawak, Malaysia, was established using a polyphasic approach. Phylogenetically, strain C296001T was closely associated with the genus Luteipulveratus and formed a distinct monophyletic clade with the only described species, Luteipulveratus mongoliensis NBRC 105296T. The 16S rRNA gene sequence similarity between strain C296001T and L. mongoliensis was 98.7 %. DNA–DNA hybridization results showed that the relatedness of strain C296001T to L. mongoliensis was only 21.5 %. The DNA G+C content of strain C296001T was 71.7 mol%. Using a PacBio RS II system, whole genome sequences for strains C296001T and NBRC 105296T were obtained. The genome sizes of 4.5 Mbp and 5.4 Mbp determined were similar to those of other members of the family Dermacoccaceae. The cell-wall peptidoglycan contained lysine, alanine, aspartic acid, glutamic acid and serine, representing the peptidoglycan type A4α l-Lys-l-Ser-d-Asp. The major menaquinones were MK-8(H4), MK-8 and MK-8(H2). Phosphatidylglycerol, phosphatidylinositol, diphosphatidylglycerol and phosphoglycolipid were the polar lipids, while the whole-cell sugars were glucose, fucose and lesser amounts of ribose and galactose. The major fatty acids were iso-C16 : 0, anteiso-C17 : 0, iso-C16 : 1 H, anteiso-C17 : 1ω9c, iso-C18 : 0 and 10-methyl C17 : 0. Chemotaxonomic analyses showed that C296001T had typical characteristics of members of the genus Luteipulveratus, with the main differences occurring in phenotypic characteristics. On the basis of the phenotypic and chemotaxonomic evidence, it is proposed that strain C296001T be classified as a representative of a novel species in the genus Luteipulveratus, for which the name Luteipulveratus halotolerans sp. nov. is recommended. The type strain is C296001T ( = ATCC TSD-4T = JCM 30660T).
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Affiliation(s)
- Holed Juboi
- Sarawak Biodiversity Centre, Km. 20 Jalan Borneo Heights, Semengoh, 93250 Kuching, Sarawak, Malaysia
| | - Ann Anni Basik
- Sarawak Biodiversity Centre, Km. 20 Jalan Borneo Heights, Semengoh, 93250 Kuching, Sarawak, Malaysia
| | - Sunita Sara Gill Shamsul
- Sarawak Biodiversity Centre, Km. 20 Jalan Borneo Heights, Semengoh, 93250 Kuching, Sarawak, Malaysia
| | - Phil Arnold
- Novartis Institutes for BioMedical Research, Novartis Campus, CH-4058 Basel, Switzerland
| | - Esther K. Schmitt
- Novartis Institutes for BioMedical Research, Novartis Campus, CH-4058 Basel, Switzerland
| | - Jean-Jacques Sanglier
- Sarawak Biodiversity Centre, Km. 20 Jalan Borneo Heights, Semengoh, 93250 Kuching, Sarawak, Malaysia
| | - Tiong Chia Yeo
- Sarawak Biodiversity Centre, Km. 20 Jalan Borneo Heights, Semengoh, 93250 Kuching, Sarawak, Malaysia
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120
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Cheng KCC, Cao S, Raveh A, MacArthur R, Dranchak P, Chlipala G, Okoneski MT, Guha R, Eastman RT, Yuan J, Schultz PJ, Su XZ, Tamayo-Castillo G, Matainaho T, Clardy J, Sherman DH, Inglese J. Actinoramide A Identified as a Potent Antimalarial from Titration-Based Screening of Marine Natural Product Extracts. JOURNAL OF NATURAL PRODUCTS 2015; 78:2411-2422. [PMID: 26465675 PMCID: PMC4633019 DOI: 10.1021/acs.jnatprod.5b00489] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Methods to identify the bioactive diversity within natural product extracts (NPEs) continue to evolve. NPEs constitute complex mixtures of chemical substances varying in structure, composition, and abundance. NPEs can therefore be challenging to evaluate efficiently with high-throughput screening approaches designed to test pure substances. Here we facilitate the rapid identification and prioritization of antimalarial NPEs using a pharmacologically driven, quantitative high-throughput-screening (qHTS) paradigm. In qHTS each NPE is tested across a concentration range from which sigmoidal response, efficacy, and apparent EC50s can be used to rank order NPEs for subsequent organism reculture, extraction, and fractionation. Using an NPE library derived from diverse marine microorganisms we observed potent antimalarial activity from two Streptomyces sp. extracts identified from thousands tested using qHTS. Seven compounds were isolated from two phylogenetically related Streptomyces species: Streptomyces ballenaensis collected from Costa Rica and Streptomyces bangulaensis collected from Papua New Guinea. Among them we identified actinoramides A and B, belonging to the unusually elaborated nonproteinogenic amino-acid-containing tetrapeptide series of natural products. In addition, we characterized a series of new compounds, including an artifact, 25-epi-actinoramide A, and actinoramides D, E, and F, which are closely related biosynthetic congeners of the previously reported metabolites.
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Affiliation(s)
- Ken Chih-Chien Cheng
- National Center of Advancing Translational Sciences, National Institutes of Health, Rockville, MD 20850
| | - Shugeng Cao
- Department of Pharmaceutical Sciences, Daniel K. Inouye College of Pharmacy, University of Hawai'i at Hilo, Hilo, HI 96720, USA
- Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, 240 Longwood Avenue, C-643, Boston, Massachusetts 021151, USA
| | - Avi Raveh
- Life Sciences Institute, University of Michigan, Ann Arbor, MI 48109-2216, USA
| | - Ryan MacArthur
- National Center of Advancing Translational Sciences, National Institutes of Health, Rockville, MD 20850
| | - Patricia Dranchak
- National Center of Advancing Translational Sciences, National Institutes of Health, Rockville, MD 20850
| | - George Chlipala
- Life Sciences Institute, University of Michigan, Ann Arbor, MI 48109-2216, USA
| | - Matthew T. Okoneski
- Life Sciences Institute, University of Michigan, Ann Arbor, MI 48109-2216, USA
- Departments of Medicinal Chemistry, Chemistry, Microbiology & Immunology, University of Michigan, Ann Arbor, MI 48109-2216, USA
| | - Rajarshi Guha
- National Center of Advancing Translational Sciences, National Institutes of Health, Rockville, MD 20850
| | - Richard T. Eastman
- Laboratory of Malaria and Vector Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland 20852, USA
| | - Jing Yuan
- Laboratory of Malaria and Vector Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland 20852, USA
| | - Pamela J. Schultz
- Life Sciences Institute, University of Michigan, Ann Arbor, MI 48109-2216, USA
| | - Xin-zhuan Su
- Laboratory of Malaria and Vector Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland 20852, USA
| | - Giselle Tamayo-Castillo
- Unidad Estrategica de Bioprospección, Instituto Nacional de Biodiversidad (INBio), Santo Domingo de Heredia, Costa Rica & CIPRONA-Escuela de Química, Universidad de Costa Rica, 2060 San Pedro, Costa Rica
| | - Teatulohi Matainaho
- School of Medicine and Health Sciences, University of Papua New Guinea, Boroko, Papua New Guinea
| | - Jon Clardy
- Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, 240 Longwood Avenue, C-643, Boston, Massachusetts 021151, USA
| | - David H. Sherman
- Life Sciences Institute, University of Michigan, Ann Arbor, MI 48109-2216, USA
- Departments of Medicinal Chemistry, Chemistry, Microbiology & Immunology, University of Michigan, Ann Arbor, MI 48109-2216, USA
| | - James Inglese
- National Center of Advancing Translational Sciences, National Institutes of Health, Rockville, MD 20850
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Sun W, Zhang F, He L, Karthik L, Li Z. Actinomycetes from the South China Sea sponges: isolation, diversity, and potential for aromatic polyketides discovery. Front Microbiol 2015; 6:1048. [PMID: 26483773 PMCID: PMC4589764 DOI: 10.3389/fmicb.2015.01048] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2015] [Accepted: 09/14/2015] [Indexed: 12/21/2022] Open
Abstract
Marine sponges often harbor dense and diverse microbial communities including actinobacteria. To date no comprehensive investigation has been performed on the culturable diversity of the actinomycetes associated with South China Sea sponges. Structurally novel aromatic polyketides were recently discovered from marine sponge-derived Streptomyces and Saccharopolyspora strains, suggesting that sponge-associated actinomycetes can serve as a new source of aromatic polyketides. In this study, a total of 77 actinomycete strains were isolated from 15 South China Sea sponge species. Phylogenetic characterization of the isolates based on 16S rRNA gene sequencing supported their assignment to 12 families and 20 genera, among which three rare genera (Marihabitans, Polymorphospora, and Streptomonospora) were isolated from marine sponges for the first time. Subsequently, β-ketoacyl synthase (KSα) gene was used as marker for evaluating the potential of the actinomycete strains to produce aromatic polyketides. As a result, KSα gene was detected in 35 isolates related to seven genera (Kocuria, Micromonospora, Nocardia, Nocardiopsis, Saccharopolyspora, Salinispora, and Streptomyces). Finally, 10 strains were selected for small-scale fermentation, and one angucycline compound was detected from the culture extract of Streptomyces anulatus strain S71. This study advanced our knowledge of the sponge-associated actinomycetes regarding their diversity and potential in producing aromatic polyketides.
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Affiliation(s)
- Wei Sun
- Marine Biotechnology Laboratory, State Key Laboratory of Microbial Metabolism, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University Shanghai, China
| | - Fengli Zhang
- Marine Biotechnology Laboratory, State Key Laboratory of Microbial Metabolism, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University Shanghai, China
| | - Liming He
- Marine Biotechnology Laboratory, State Key Laboratory of Microbial Metabolism, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University Shanghai, China
| | - Loganathan Karthik
- Marine Biotechnology Laboratory, State Key Laboratory of Microbial Metabolism, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University Shanghai, China
| | - Zhiyong Li
- Marine Biotechnology Laboratory, State Key Laboratory of Microbial Metabolism, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University Shanghai, China
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Duran R, Bielen A, Paradžik T, Gassie C, Pustijanac E, Cagnon C, Hamer B, Vujaklija D. Exploring Actinobacteria assemblages in coastal marine sediments under contrasted Human influences in the West Istria Sea, Croatia. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2015; 22:15215-29. [PMID: 25712885 DOI: 10.1007/s11356-015-4240-1] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/29/2014] [Accepted: 02/13/2015] [Indexed: 05/27/2023]
Abstract
The exploration of marine Actinobacteria has as major challenge to answer basic questions of microbial ecology that, in turn, will provide useful information to exploit Actinobacteria metabolisms in biotechnological processes. The ecological functions performed by Actinobacteria in marine sediments are still unclear and belongs to the most burning basic questions. The comparison of Actinobacteria communities inhabiting marine sediments that are under the influence of different contamination types will provide valuable information in the adaptation capacities of Actinobacteria to colonize specific ecological niche. In the present study, the characterization of different Actinobacteria assemblages according to contamination type revealed the ecological importance of Actinobacteria for maintaining both general biogeochemical functions through a "core" Actinobacteria community and specific roles associated with the presence of contaminants. Indeed, the results allowed to distinguish Actinobacteria genera and species operational taxonomic units (OTUs) able to cope with the presence of either (i) As, (ii) metals Ni, Fe, V, Cr, and Mn, or (iii) polycyclic aromatic hydrocarbons (PAHs) and toxic metals (Hg, Cd, Cu, Pb, and Zn). Such observations highlighted the metabolic capacities of Actinobacteria and their potential that should be taken into consideration and advantage during the implementation of bioremediation processes in marine ecosystems.
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Affiliation(s)
- Robert Duran
- Equipe Environnement et Microbiologie, MELODY group, Université de Pau et des Pays de l'Adour, IPREM UMR CNRS 5254, BP 1155, 64013, Pau Cedex, France.
- Université de Pau et des Pays de l'Adour, Bâtiment IBEAS, BP1155, 64013, Pau Cedex, France.
| | - Ana Bielen
- Division of Molecular Biology, Institute Ruđer Bošković, Bijenička 54, 10000, Zagreb, Croatia
| | - Tina Paradžik
- Division of Molecular Biology, Institute Ruđer Bošković, Bijenička 54, 10000, Zagreb, Croatia
| | - Claire Gassie
- Equipe Environnement et Microbiologie, MELODY group, Université de Pau et des Pays de l'Adour, IPREM UMR CNRS 5254, BP 1155, 64013, Pau Cedex, France
| | - Emina Pustijanac
- Juraj Dobrila University of Pula, Zagrebačka 30, 52100, Pula, Croatia
| | - Christine Cagnon
- Equipe Environnement et Microbiologie, MELODY group, Université de Pau et des Pays de l'Adour, IPREM UMR CNRS 5254, BP 1155, 64013, Pau Cedex, France
| | - Bojan Hamer
- Center for Marine Research, Ruđer Bošković Institute, Giordano Paliaga 5, 52210, Rovinj, Croatia
| | - Dušica Vujaklija
- Division of Molecular Biology, Institute Ruđer Bošković, Bijenička 54, 10000, Zagreb, Croatia
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123
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Patin NV, Duncan KR, Dorrestein PC, Jensen PR. Competitive strategies differentiate closely related species of marine actinobacteria. ISME JOURNAL 2015; 10:478-90. [PMID: 26241505 DOI: 10.1038/ismej.2015.128] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/13/2015] [Revised: 05/26/2015] [Accepted: 06/18/2015] [Indexed: 01/12/2023]
Abstract
Although competition, niche partitioning, and spatial isolation have been used to describe the ecology and evolution of macro-organisms, it is less clear to what extent these principles account for the extraordinary levels of bacterial diversity observed in nature. Ecological interactions among bacteria are particularly challenging to address due to methodological limitations and uncertainties over how to recognize fundamental units of diversity and link them to the functional traits and evolutionary processes that led to their divergence. Here we show that two closely related marine actinomycete species can be differentiated based on competitive strategies. Using a direct challenge assay to investigate inhibitory interactions with members of the bacterial community, we observed a temporal difference in the onset of inhibition. The majority of inhibitory activity exhibited by Salinispora arenicola occurred early in its growth cycle and was linked to antibiotic production. In contrast, most inhibition by Salinispora tropica occurred later in the growth cycle and was more commonly linked to nutrient depletion or other sources. Comparative genomics support these differences, with S. arenicola containing nearly twice the number of secondary metabolite biosynthetic gene clusters as S. tropica, indicating a greater potential for secondary metabolite production. In contrast, S. tropica is enriched in gene clusters associated with the acquisition of growth-limiting nutrients such as iron. Coupled with differences in growth rates, the results reveal that S. arenicola uses interference competition at the expense of growth, whereas S. tropica preferentially employs a strategy of exploitation competition. The results support the ecological divergence of two co-occurring and closely related species of marine bacteria by providing evidence they have evolved fundamentally different strategies to compete in marine sediments.
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Affiliation(s)
- Nastassia V Patin
- Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA, USA
| | - Katherine R Duncan
- Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA, USA
| | - Pieter C Dorrestein
- Skaggs School of Pharmacy and Pharmaceutical Sciences, Departments of Pharmacology, Chemistry and Biochemistry, University of California San Diego, La Jolla, CA, USA
| | - Paul R Jensen
- Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA, USA
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124
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Claverías FP, Undabarrena A, González M, Seeger M, Cámara B. Culturable diversity and antimicrobial activity of Actinobacteria from marine sediments in Valparaíso bay, Chile. Front Microbiol 2015; 6:737. [PMID: 26284034 PMCID: PMC4516979 DOI: 10.3389/fmicb.2015.00737] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2015] [Accepted: 07/06/2015] [Indexed: 12/21/2022] Open
Abstract
Marine-derived Actinobacteria are a source of a broad variety of secondary metabolites with diverse biological activities, such as antibiotics and antitumorals; many of which have been developed for clinical use. Rare Actinobacteria represent an untapped source of new bioactive compounds that have been scarcely recognized. In this study, rare Actinobacteria from marine sediments were isolated from the Valparaíso bay, Chile, and their potential to produce antibacterial compounds was evaluated. Different culture conditions and selective media that select the growth of Actinobacteria were used leading to the isolation of 68 bacterial strains. Comparative analysis of the 16S rRNA gene sequences led to identifying isolates that belong to the phylum Actinobacteria with genetic affiliations to 17 genera: Aeromicrobium, Agrococcus, Arthrobacter, Brachybacterium, Corynebacterium, Dietzia, Flaviflexus, Gordonia, Isoptericola, Janibacter, Microbacterium, Mycobacterium, Ornithinimicrobium, Pseudonocardia, Rhodococcus, Streptomyces, and Tessaracoccus. Also, one isolate could not be consistently classified and formed a novel phylogenetic branch related to the Nocardiopsaceae family. The antimicrobial activity of these isolates was evaluated, demonstrating the capability of specific novel isolates to inhibit the growth of Gram-positive and Gram-negative bacteria. In conclusion, this study shows a rich biodiversity of culturable Actinobacteria, associated to marine sediments from Valparaíso bay, highlighting novel rare Actinobacteria, and their potential for the production of biologically active compounds.
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Affiliation(s)
| | | | | | | | - Beatriz Cámara
- Laboratorio de Microbiología Molecular y Biotecnología Ambiental, Departamento de Química and Centro de Biotecnología Daniel Alkalay Lowitt, Universidad Técnica Federico Santa MaríaValparaíso, Chile
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125
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Cytosine-type nucleosides from marine-derived Streptomyces rochei 06CM016. J Antibiot (Tokyo) 2015; 69:51-6. [DOI: 10.1038/ja.2015.72] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2015] [Revised: 04/27/2015] [Accepted: 05/07/2015] [Indexed: 02/07/2023]
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126
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Golinska P, Wypij M, Agarkar G, Rathod D, Dahm H, Rai M. Endophytic actinobacteria of medicinal plants: diversity and bioactivity. Antonie van Leeuwenhoek 2015; 108:267-89. [PMID: 26093915 PMCID: PMC4491368 DOI: 10.1007/s10482-015-0502-7] [Citation(s) in RCA: 180] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 04/17/2015] [Accepted: 06/04/2015] [Indexed: 02/07/2023]
Abstract
Endophytes are the microorganisms that exist inside the plant tissues without having any negative impact on the host plant. Medicinal plants constitute the huge diversity of endophytic actinobacteria of economical importance. These microbes have huge potential to synthesis of numerous novel compounds that can be exploited in pharmaceutical, agricultural and other industries. It is of prime importance to focus the present research on practical utilization of this microbial group in order to find out the solutions to the problems related to health, environment and agriculture. An extensive characterization of diverse population of endophytic actinobacteria associated with medicinal plants can provide a greater insight into the plant-endophyte interactions and evolution of mutualism. In the present review, we have discussed the diversity of endophytic actinobacteria of from medicinal plants their multiple bioactivities.
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Affiliation(s)
- Patrycja Golinska
- Department of Microbiology, Nicolaus Copernicus University, 87100, Torun, Poland,
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Jensen PR, Moore BS, Fenical W. The marine actinomycete genus Salinispora: a model organism for secondary metabolite discovery. Nat Prod Rep 2015; 32:738-51. [PMID: 25730728 PMCID: PMC4414829 DOI: 10.1039/c4np00167b] [Citation(s) in RCA: 126] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
This review covers the initial discovery of the marine actinomycete genus Salinispora through its development as a model for natural product research. A focus is placed on the novel chemical structures reported with reference to their biological activities and the synthetic and biosynthetic studies they have inspired. The time line of discoveries progresses from more traditional bioassay-guided approaches through the application of genome mining and genetic engineering techniques that target the products of specific biosynthetic gene clusters. This overview exemplifies the extraordinary biosynthetic diversity that can emanate from a narrowly defined genus and supports future efforts to explore marine taxa in the search for novel natural products.
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Affiliation(s)
- Paul R Jensen
- Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California, San Diego, USA.
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Valan AM, Asha KRT, Duraipandiyan V, Ignacimuthu S, Agastian P. Characterization and phylogenetic analysis of novel polyene type antimicrobial metabolite producing actinomycetes from marine sediments: Bay of Bengal, India. Asian Pac J Trop Biomed 2015; 2:803-10. [PMID: 23569851 DOI: 10.1016/s2221-1691(12)60233-0] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2011] [Revised: 04/27/2011] [Accepted: 06/28/2011] [Indexed: 11/30/2022] Open
Abstract
OBJECTIVE To isolate and indentify the promising antimicrobial metabolite producing Streptomyces strains from marine sediment samples from Andrapradesh coast of India. METHODS Antagonistic actinomycetes were isolated by starch casein agar medium and modified nutrient agar medium with 1% glucose used as a base for primary screening. Significant antimicrobial metabolite producing strains were selected and identified by using biochemical and 16S rDNA level. Minimum inhibitory concentrations of the organic extracts were done by using broth micro dilution method. RESULTS Among the 210 actinomycetes, 64.3% exhibited activity against Gram positive bacteria, 48.5 % showed activity towards Gram negative bacteria, 38.8% exhibited both Gram positive and negative bacteria and 80.85 % isolates revealed significant antifungal activity. However, five isolates AP-5, AP-18, AP-41 and AP-70 showed significant antimicrobial activity. The analysis of cell wall hydrolysates showed the presence of LL-diaminopimelic acid and glycine in all the isolates. Sequencing analysis indicated that the isolates shared 98.5%-99.8% sequence identity to the 16S rDNA gene sequences of the Streptomyces taxons. The antimicrobial substances were extracted using hexane and ethyl acetate from spent medium in which strains were cultivated at 30°Cfor five days. The antimicrobial activity was assessed using broth micro dilution technique. Each of the culture extracts from these five strains showed a typical polyene-like property. The lowest minimum inhibitory concentrations of ethyl acetate extracts against Escherichia coli and Curvularia lunata were 67.5 and 125.0 µg/mL, respectively. CONCLUSIONS It can be concluded that hexane and ethyl acetate soluble extracellular products of novel isolates are effective against pathogenic bacteria and fungi.
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Affiliation(s)
- Arasu M Valan
- Division of Microbiology, Entomology Research Institute, Loyola College, Chennai, India
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Functional gene-based discovery of phenazines from the actinobacteria associated with marine sponges in the South China Sea. Appl Microbiol Biotechnol 2015; 99:5939-50. [PMID: 25820602 DOI: 10.1007/s00253-015-6547-8] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2014] [Revised: 03/05/2015] [Accepted: 03/15/2015] [Indexed: 10/23/2022]
Abstract
Phenazines represent a large group of nitrogen-containing heterocyclic compounds produced by the diverse group of bacteria including actinobacteria. In this study, a total of 197 actinobacterial strains were isolated from seven different marine sponge species in the South China Sea using five different culture media. Eighty-seven morphologically different actinobacterial strains were selected and grouped into 13 genera, including Actinoalloteichus, Kocuria, Micrococcus, Micromonospora, Mycobacterium, Nocardiopsis, Prauserella, Rhodococcus, Saccharopolyspora, Salinispora, Serinicoccus, and Streptomyces by the phylogenetic analysis of 16S rRNA gene. Based on the screening of phzE genes, ten strains, including five Streptomyces, two Nocardiopsis, one Salinispora, one Micrococcus, and one Serinicoccus were found to be potential for phenazine production. The level of phzE gene expression was highly expressed in Nocardiopsis sp. 13-33-15, 13-12-13, and Serinicoccus sp. 13-12-4 on the fifth day of fermentation. Finally, 1,6-dihydroxy phenazine (1) from Nocardiopsis sp. 13-33-15 and 13-12-13, and 1,6-dimethoxy phenazine (2) from Nocardiopsis sp. 13-33-15 were isolated and identified successfully based on ESI-MS and NMR analysis. The compounds 1 and 2 showed antibacterial activity against Bacillus mycoides SJ14, Staphylococcus aureus SJ51, Escherichia coli SJ42, and Micrococcus luteus SJ47. This study suggests that the integrated approach of gene screening and chemical analysis is an effective strategy to find the target compounds and lays the basis for the production of phenazine from the sponge-associated actinobacteria.
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130
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Moore BS, Gerwick WH. Special issue in honor of William Fenical, a pioneer in marine natural products discovery and drug development. JOURNAL OF NATURAL PRODUCTS 2015; 78:347-348. [PMID: 25814030 DOI: 10.1021/acs.jnatprod.5b00146] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
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Khandan Dezfully N, Gottravalli Ramanayaka J. Isolation, Identification and Evaluation of Antimicrobial Activity of Streptomyces flavogriseus, strain ACTK2 from Soil Sample of Kodagu, Karnataka State (India). Jundishapur J Microbiol 2015; 8:e15107. [PMID: 25825640 PMCID: PMC4376976 DOI: 10.5812/jjm.15107] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2013] [Revised: 01/30/2014] [Accepted: 02/02/2014] [Indexed: 11/16/2022] Open
Abstract
Background: The search for novel antibiotics continues to be of immense importance in research programs around the world for pharmaceutical, industrial and agricultural applications. Filamentous soil bacteria, belonging to the Streptomyces genus, are widely used as an important biological tool for their ability to produce a wide range of novel secondary metabolites, such as “antibiotics”. Objectives: The aim of the present study was to isolate and identify a strain of Streptomyces with high antibiotic production capability. Materials and Methods: The soil sample was collected randomly from the agricultural land of Kushalnagar Taluk of Kodagu district, Karnataka, India. The ACTK2 strain was isolated by serial dilution method and identified based on cultural, morphological, microscopic, biochemical and sequence analysis of 16S rRNA gene parameters. The isolated ACTK2 was analyzed for antimicrobial activities by perpendicular streak and disc diffusion methods, against the Gram-positive bacteria Staphylococcus aureus (MTCC 96), Bacillus subtilis (MTCC 121), Gram-negative Escherichia. coli (MTCC 729), Enterococcus aerogenes (MTCC 2829) and filamentous fungi (Trichoderma harizianum (MTCC6046), Fusarium proliferatum (MTCC 9375). Further, an antimicrobial metabolite from the ACTK2 strain was extracted by solvent extraction method, using n-butanol. The production of the antimicrobial compound by the ACTK2 strain was optimized by using different nutritional media and cultural conditions. Results: The strain Streptomycesflavogriseus designated as ACTK2 (Accession number KC990785) isolated from the soil sample of Kushalnagar Taluk, Kodagu, Karnataka, India, exhibited a broad spectrum of antimicrobial activity against test microorganisms. The optimum growth and antimicrobial compound production by strain ACTK2 was found to be a maximal pH 8, in the shaker incubator at 28ºC, for a period of 10 days. Conclusions: The crude n-butanol extract of the ACTK2 strain of S. flavogriseus showed a broad spectrum of antimicrobial activities against the test organisms and this opened further research investigations on purification and structural characterization of the active compounds from the crude extract.
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Affiliation(s)
| | - Janardhana Gottravalli Ramanayaka
- Mycology and Phytopathology Laboratory, Department of Studies in Botany, University of Mysore, Manasagangotri, Karnataka, India
- Corresponding author: Janardhana G.R., Mycology and Phytopathology Laboratory, Department of Studies in Botany, University of Mysore, Manasagangotri, Mysore-570006, Karnataka, India. Tel: +91-9845636998, Fax: +91-8212419759, E-mail:
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132
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LC-MS-based metabolomics study of marine bacterial secondary metabolite and antibiotic production in Salinispora arenicola. Mar Drugs 2015; 13:249-66. [PMID: 25574739 PMCID: PMC4306935 DOI: 10.3390/md13010249] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2014] [Accepted: 12/29/2014] [Indexed: 01/06/2023] Open
Abstract
An LC-MS-based metabolomics approach was used to characterise the variation in secondary metabolite production due to changes in the salt content of the growth media as well as across different growth periods (incubation times). We used metabolomics as a tool to investigate the production of rifamycins (antibiotics) and other secondary metabolites in the obligate marine actinobacterial species Salinispora arenicola, isolated from Great Barrier Reef (GBR) sponges, at two defined salt concentrations and over three different incubation periods. The results indicated that a 14 day incubation period is optimal for the maximum production of rifamycin B, whereas rifamycin S and W achieve their maximum concentration at 29 days. A "chemical profile" link between the days of incubation and the salt concentration of the growth medium was shown to exist and reliably represents a critical point for selection of growth medium and harvest time.
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133
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Bu YY, Yamazaki H, Ukai K, Namikoshi M. Anti-mycobacterial nucleoside antibiotics from a marine-derived Streptomyces sp. TPU1236A. Mar Drugs 2014; 12:6102-12. [PMID: 25522318 PMCID: PMC4278220 DOI: 10.3390/md12126102] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2014] [Revised: 12/09/2014] [Accepted: 12/10/2014] [Indexed: 12/04/2022] Open
Abstract
Five new nucleoside antibiotics, named streptcytosines A–E (1–5), and six known compounds, de-amosaminyl-cytosamine (6), plicacetin (7), bamicetin (8), amicetin (9), collismycin B (10), and SF2738 C (11), were isolated from a culture broth of Streptomyces sp. TPU1236A collected in Okinawa, Japan. The structures of new compounds were elucidated on the basis of their spectroscopic data (HRFABMS, IR, UV, and 2D NMR experiments including 1H-1H COSY, HMQC, HMBC, and NOESY spectra). Streptcytosine A (1) belonged to the amicetin group antibiotics, and streptcytosines B–E (2–5) were derivatives of de-amosaminyl-cytosamine (6), 2,3,6-trideoxyglucopyranosyl cytosine. Compound 1 inhibited the growth of Mycobacterium smegmatis (MIC = 32 µg/mL), while compounds 2–5 were not active at 50 µg/disc. Bamicetin (8) and amicetin (9) showed the MICs of 16 and 8 µg/mL, respectively.
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Affiliation(s)
- Ying-Yue Bu
- Faculty of Pharmaceutical Sciences, Tohoku Pharmaceutical University, Aoba-ku, Sendai 981-8558, Japan.
| | - Hiroyuki Yamazaki
- Faculty of Pharmaceutical Sciences, Tohoku Pharmaceutical University, Aoba-ku, Sendai 981-8558, Japan.
| | - Kazuyo Ukai
- Faculty of Pharmaceutical Sciences, Tohoku Pharmaceutical University, Aoba-ku, Sendai 981-8558, Japan.
| | - Michio Namikoshi
- Faculty of Pharmaceutical Sciences, Tohoku Pharmaceutical University, Aoba-ku, Sendai 981-8558, Japan.
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134
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Duncan KR, Haltli B, Gill KA, Correa H, Berrué F, Kerr RG. Exploring the diversity and metabolic potential of actinomycetes from temperate marine sediments from Newfoundland, Canada. J Ind Microbiol Biotechnol 2014; 42:57-72. [PMID: 25371290 DOI: 10.1007/s10295-014-1529-x] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2014] [Accepted: 10/17/2014] [Indexed: 10/24/2022]
Abstract
Marine sediments from Newfoundland, Canada were explored for biotechnologically promising Actinobacteria using culture-independent and culture-dependent approaches. Culture-independent pyrosequencing analyses uncovered significant actinobacterial diversity (H'-2.45 to 3.76), although the taxonomic diversity of biotechnologically important actinomycetes could not be fully elucidated due to limited sampling depth. Assessment of culturable actinomycete diversity resulted in the isolation of 360 actinomycetes representing 59 operational taxonomic units, the majority of which (94 %) were Streptomyces. The biotechnological potential of actinomycetes from NL sediments was assessed by bioactivity and metabolomics-based screening of 32 representative isolates. Bioactivity was exhibited by 41 % of isolates, while 11 % exhibited unique chemical signatures in metabolomics screening. Chemical analysis of two isolates resulted in the isolation of the cytotoxic metabolite 1-isopentadecanoyl-3β-D-glucopyranosyl-X-glycerol from Actinoalloteichus sp. 2L868 and sungsanpin from Streptomyces sp. 8LB7. These results demonstrate the potential for the discovery of novel bioactive metabolites from actinomycetes isolated from Atlantic Canadian marine sediments.
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Affiliation(s)
- K R Duncan
- Department of Biomedical Sciences, University of Prince Edward Island, 550 University Avenue, Charlottetown, PE, C1A 4P3, Canada
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135
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Harikrishnan H, Shanmugaiah V, Balasubramanian N, Sharma MP, Kotchoni SO. Antagonistic potential of native strain Streptomyces aurantiogriseus VSMGT1014 against sheath blight of rice disease. World J Microbiol Biotechnol 2014; 30:3149-61. [PMID: 25304022 DOI: 10.1007/s11274-014-1742-9] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2014] [Accepted: 09/15/2014] [Indexed: 11/28/2022]
Abstract
A total of 132 actinomycetes was isolated from different rice rhizosphere soils of Tamil Nadu, India, among which 57 showed antagonistic activity towards Rhizoctonia solani, which is sheath blight (ShB) pathogen of rice and other fungal pathogens such as Macrophomina phaseolina, Fusarium oxysporum, Fusarium udum and Alternaria alternata with a variable zone of inhibition. Potential actinomycete strain VSMGT1014 was identified as Streptomyces aurantiogriseus VSMGT1014 based on the morphological, physiological, biochemical and 16S rRNA sequence analysis. The strain VSMGT1014 produced lytic enzymes, secondary metabolites, siderophore, volatile substance and indole acetic acid. Crude metabolites of VSMGT1014 showed activity against R. solani at 5 µg ml(-1); however, the prominent inhibition zone was observed from 40 to 100 µg ml(-1). Reduced lesion heights observed in culture, cells-free filtrate, crude metabolites and carbendazim on challenge with pathogen in the detached leaf assay. The high content screening test clearly indicated denucleation of R. solani at 5 µg ml(-1) treatment of crude metabolite and carbendazim respectively. The results conclude that strain VSMGT1014 was found to be a potential candidate for the control of ShB of rice as a bio fungicide.
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Affiliation(s)
- Hariharan Harikrishnan
- Department of Microbial Technology, School of Biological Sciences, Madurai Kamaraj University, Madurai, 625 021, Tamil Nadu, India
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136
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Overy DP, Bayman P, Kerr RG, Bills GF. An assessment of natural product discovery from marine ( sensu strictu) and marine-derived fungi. Mycology 2014; 5:145-167. [PMID: 25379338 PMCID: PMC4205923 DOI: 10.1080/21501203.2014.931308] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2014] [Accepted: 05/30/2014] [Indexed: 11/21/2022] Open
Abstract
The natural products community has been investigating secondary metabolites from marine fungi for several decades, but when one attempts to search for validated reports of new natural products from marine fungi, one encounters a literature saturated with reports from ‘marine-derived’ fungi. Of the 1000+ metabolites that have been characterized to date, only approximately 80 of these have been isolated from species from exclusively marine lineages. These metabolites are summarized here along with the lifestyle and habitats of their producing organisms. Furthermore, we address some of the reasons for the apparent disconnect between the stated objectives of discovering new chemistry from marine organisms and the apparent neglect of the truly exceptional obligate marine fungi. We also offer suggestions on how to reinvigorate enthusiasm for marine natural products discovery from fungi from exclusive marine lineages and highlight the need for critically assessing the role of apparently terrestrial fungi in the marine environment.
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Affiliation(s)
- David P Overy
- Department of Chemistry, University of Prince Edward Island , 550 University Ave., Charlottetown , Prince Edward Island , Canada C1A 4P3 ; Department of Pathology and Microbiology, Atlantic Veterinary College, University of Prince Edward Island , 550 University Ave., Charlottetown , Prince Edward Island , Canada C1A 4P3 ; Nautilus Biosciences Canada, Duffy Research Center, University of Prince Edward Island , 550 University Ave., Charlottetown , Prince Edward Island , Canada C1A 4P3
| | - Paul Bayman
- Department of Biology, University of Puerto Rico-Río Piedras , P. O. Box 23360, San Juan 00931 , Puerto Rico
| | - Russell G Kerr
- Department of Chemistry, University of Prince Edward Island , 550 University Ave., Charlottetown , Prince Edward Island , Canada C1A 4P3 ; Department of Biomedical Sciences, Atlantic Veterinary College, University of Prince Edward Island , 550 University Ave., Charlottetown , Prince Edward Island , Canada C1A 4P3 ; Nautilus Biosciences Canada, Duffy Research Center, University of Prince Edward Island , 550 University Ave., Charlottetown , Prince Edward Island , Canada C1A 4P3
| | - Gerald F Bills
- Texas Therapeutics Institute, The Brown Foundation Institute of Molecular Medicine, University of Texas Health Science Center , 1881 East Rd., Houston , TX 77054 , USA
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137
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Manivasagan P, Kang KH, Sivakumar K, Li-Chan ECY, Oh HM, Kim SK. Marine actinobacteria: an important source of bioactive natural products. ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY 2014; 38:172-188. [PMID: 24959957 DOI: 10.1016/j.etap.2014.05.014] [Citation(s) in RCA: 89] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/27/2014] [Revised: 05/21/2014] [Accepted: 05/26/2014] [Indexed: 06/03/2023]
Abstract
Marine environment is largely an untapped source for deriving actinobacteria, having potential to produce novel, bioactive natural products. Actinobacteria are the prolific producers of pharmaceutically active secondary metabolites, accounting for about 70% of the naturally derived compounds that are currently in clinical use. Among the various actinobacterial genera, Actinomadura, Actinoplanes, Amycolatopsis, Marinispora, Micromonospora, Nocardiopsis, Saccharopolyspora, Salinispora, Streptomyces and Verrucosispora are the major potential producers of commercially important bioactive natural products. In this respect, Streptomyces ranks first with a large number of bioactive natural products. Marine actinobacteria are unique enhancing quite different biological properties including antimicrobial, anticancer, antiviral, insecticidal and enzyme inhibitory activities. They have attracted global in the last ten years for their ability to produce pharmaceutically active compounds. In this review, we have focused attention on the bioactive natural products isolated from marine actinobacteria, possessing unique chemical structures that may form the basis for synthesis of novel drugs that could be used to combat resistant pathogenic microorganisms.
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Affiliation(s)
- Panchanathan Manivasagan
- Specialized Graduate School Science & Technology Convergence, Department of Marine-Bio. Convergence Science and Marine Bioprocess Research Center, Pukyong National University, Busan 608-739, Republic of Korea
| | - Kyong-Hwa Kang
- Specialized Graduate School Science & Technology Convergence, Department of Marine-Bio. Convergence Science and Marine Bioprocess Research Center, Pukyong National University, Busan 608-739, Republic of Korea
| | - Kannan Sivakumar
- Centre of Advanced Study in Marine Biology, Faculty of Marine Sciences, Annamalai University, Parangipettai 608 502, Tamil Nadu, India
| | - Eunice C Y Li-Chan
- The University of British Columbia, Faculty of Land and Food Systems, Food Nutrition and Health Program, 2205 East Mall, Vancouver, British Columbia, Canada V6T 1Z4
| | - Hyun-Myung Oh
- Specialized Graduate School Science & Technology Convergence, Department of Marine-Bio. Convergence Science and Marine Bioprocess Research Center, Pukyong National University, Busan 608-739, Republic of Korea
| | - Se-Kwon Kim
- Specialized Graduate School Science & Technology Convergence, Department of Marine-Bio. Convergence Science and Marine Bioprocess Research Center, Pukyong National University, Busan 608-739, Republic of Korea.
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138
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Macintyre L, Zhang T, Viegelmann C, Martinez IJ, Cheng C, Dowdells C, Abdelmohsen UR, Gernert C, Hentschel U, Edrada-Ebel R. Metabolomic tools for secondary metabolite discovery from marine microbial symbionts. Mar Drugs 2014; 12:3416-48. [PMID: 24905482 PMCID: PMC4071584 DOI: 10.3390/md12063416] [Citation(s) in RCA: 71] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2014] [Revised: 05/20/2014] [Accepted: 05/20/2014] [Indexed: 11/16/2022] Open
Abstract
Marine invertebrate-associated symbiotic bacteria produce a plethora of novel secondary metabolites which may be structurally unique with interesting pharmacological properties. Selection of strains usually relies on literature searching, genetic screening and bioactivity results, often without considering the chemical novelty and abundance of secondary metabolites being produced by the microorganism until the time-consuming bioassay-guided isolation stages. To fast track the selection process, metabolomic tools were used to aid strain selection by investigating differences in the chemical profiles of 77 bacterial extracts isolated from cold water marine invertebrates from Orkney, Scotland using liquid chromatography-high resolution mass spectrometry (LC-HRMS) and nuclear magnetic resonance (NMR) spectroscopy. Following mass spectrometric analysis and dereplication using an Excel macro developed in-house, principal component analysis (PCA) was employed to differentiate the bacterial strains based on their chemical profiles. NMR 1H and correlation spectroscopy (COSY) were also employed to obtain a chemical fingerprint of each bacterial strain and to confirm the presence of functional groups and spin systems. These results were then combined with taxonomic identification and bioassay screening data to identify three bacterial strains, namely Bacillus sp. 4117, Rhodococcus sp. ZS402 and Vibrio splendidus strain LGP32, to prioritize for scale-up based on their chemically interesting secondary metabolomes, established through dereplication and interesting bioactivities, determined from bioassay screening.
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Affiliation(s)
- Lynsey Macintyre
- Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, 161 Cathedral Street, Glasgow G4 0RE, UK.
| | - Tong Zhang
- Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, 161 Cathedral Street, Glasgow G4 0RE, UK.
| | - Christina Viegelmann
- Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, 161 Cathedral Street, Glasgow G4 0RE, UK.
| | - Ignacio Juarez Martinez
- Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, 161 Cathedral Street, Glasgow G4 0RE, UK.
| | - Cheng Cheng
- Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, 161 Cathedral Street, Glasgow G4 0RE, UK.
| | - Catherine Dowdells
- Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, 161 Cathedral Street, Glasgow G4 0RE, UK.
| | - Usama Ramadam Abdelmohsen
- Department of Botany II, Julius-von-Sachs Institute for Biological Sciences, University of Würzburg, Julius-von-Sachs-Platz 3, D-97082 Würzburg, Germany.
| | - Christine Gernert
- Department of Botany II, Julius-von-Sachs Institute for Biological Sciences, University of Würzburg, Julius-von-Sachs-Platz 3, D-97082 Würzburg, Germany.
| | - Ute Hentschel
- Department of Botany II, Julius-von-Sachs Institute for Biological Sciences, University of Würzburg, Julius-von-Sachs-Platz 3, D-97082 Würzburg, Germany.
| | - RuAngelie Edrada-Ebel
- Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, 161 Cathedral Street, Glasgow G4 0RE, UK.
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139
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Ng YK, Hodson MP, Hewavitharana AK, Bose U, Shaw PN, Fuerst JA. Effects of salinity on antibiotic production in sponge-derived Salinispora actinobacteria. J Appl Microbiol 2014; 117:109-25. [PMID: 24684523 DOI: 10.1111/jam.12507] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2013] [Revised: 03/02/2014] [Accepted: 03/14/2014] [Indexed: 11/28/2022]
Abstract
AIMS To investigate the effects of growth conditions related to marine habitat on antibiotic production in sponge-derived Salinispora actinobacteria. METHODS AND RESULTS Media with varying salt concentration were used to investigate the effects of salinity in relation to Salinispora growth and rifamycin production. The chemotypic profiles of the model strain Salinispora arenicola M413 was then assessed using metabolomic fingerprints from high-pressure liquid chromatography with diode array detection (HPLC-DAD) and multivariate data analysis, before extending this approach to two other strains of S. arenicola. Fingerprint data were generated from extracts of S. arenicola broth cultures grown in media of varying salt (NaCl) concentrations. These fingerprints were then compared using multivariate analysis methods such as principal components analysis (PCA) and orthogonal projection to latent structures discriminant analysis (OPLS-DA). From the analysis, a low-sodium growth condition (1% NaCl) was found to delay the onset of growth of the model S. arenicola M413 strain when compared to growth in media with either 3% artificial sea salt or 3% NaCl. However, low-sodium growth conditions also increased cell mass yield and contributed to at least a significant twofold increase in rifamycin yield when compared to growth in 3% artificial sea salt and 3% NaCl. CONCLUSIONS The integration of HPLC-DAD and multivariate analysis proved to be an effective method of assessing chemotypic variations in Salinispora grown in different salt conditions, with clear differences between strain-related chemotypes apparent due to varying salt concentrations. SIGNIFICANCE AND IMPACT OF THE STUDY The observed variation in S. arenicola chemotypic profiles further suggests diversity in secondary metabolites in this actinomycete in response to changes in the salinity of its environment.
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Affiliation(s)
- Y K Ng
- School of Chemistry and Molecular Bioscience, University of Queensland, Brisbane, Qld, Australia
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140
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Su P, Wang DX, Ding SX, Zhao J. Isolation and diversity of natural product biosynthetic genes of cultivable bacteria associated with marine sponge Mycale sp. from the coast of Fujian, China. Can J Microbiol 2014; 60:217-25. [DOI: 10.1139/cjm-2013-0785] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The marine sponge Mycale sp., a potential source of natural bioactive products, is widely distributed along the coast of Fujian, China. The cultivable bacterial community associated with Mycale sp., the antibacterial activities, and the PKS (polyketide synthase) and NRPS (nonribosomal peptide synthetase) gene diversity of these bacteria were investigated. Phylogenetic analysis of the 16S rRNA gene showed that the 51 isolates from Mycale sp. belonged to Actinobacteria, Bacteroidetes, Gammaproteobacteria, Alphaproteobacteria, and Firmicutes. Among them, some bacteria were first isolated from marine sponge. The 20 isolates with antimicrobial activities were primarily clustered within the groups Actinobacteria, Gammaproteobacteria, and Bacillus. Strain HNS054, which showed 99% similarity to Streptomyces labedae, exhibited the strongest antimicrobial activity against Gram-positive bacteria (Staphylococcus aureus MTCC 1430, Bacillus subtilis MTCC 441) and Vibrio species. The screening of natural product biosynthetic genes revealed that 8 Actinobacteria species with antimicrobial activities possessed PKS-KS (ketosynthase) or NRPS-A domains, and the Nocardiopsis species contained a hybrid or mixed PKS–NRPS system. The phylogenetic analysis of the amino acid sequences indicated that the identified KS domains clustered with those from diverse bacterial groups, including Actinobacteria, Alphaproteobacteria, Cyanobacteria, and Firmicutes. Most KS domain sequences had high homology (>80%) to type I KSs, but the KS domain of Nocardiopsis sp. strain HNS048 had 77% similarity to the type II KS domain of Burkholderia gladioli. The NRPS-A domains of the 8 isolates were grouped into the Gammaproteobacteria, Actinobacteria, and Firmicutes groups. The NRPS-A gene of strain HNS052, identified as Nocardiopsis cyriacigeorgica, showed only 54% similarity to Rhodococcus opacus. All results suggested that Mycale sp. harboured diverse bacteria that could contribute to the production of novel bioactive substances in the future.
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Affiliation(s)
- Pei Su
- College of Ocean and Earth Science of Xiamen University, Xiangan District, Building Zhou Long Quan, B2-213, Xiamen 361005, People’s Republic of China
| | - De-Xiang Wang
- College of Ocean and Earth Science of Xiamen University, Xiangan District, Building Zhou Long Quan, B2-213, Xiamen 361005, People’s Republic of China
| | - Shao-Xiong Ding
- College of Ocean and Earth Science of Xiamen University, Xiangan District, Building Zhou Long Quan, B2-213, Xiamen 361005, People’s Republic of China
| | - Jing Zhao
- College of Ocean and Earth Science of Xiamen University, Xiangan District, Building Zhou Long Quan, B2-213, Xiamen 361005, People’s Republic of China
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141
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Bose U, Hewavitharana AK, Vidgen ME, Ng YK, Shaw PN, Fuerst JA, Hodson MP. Discovering the recondite secondary metabolome spectrum of Salinispora species: a study of inter-species diversity. PLoS One 2014; 9:e91488. [PMID: 24621594 PMCID: PMC3951395 DOI: 10.1371/journal.pone.0091488] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2013] [Accepted: 02/11/2014] [Indexed: 12/23/2022] Open
Abstract
Patterns of inter-species secondary metabolite production by bacteria can provide valuable information relating to species ecology and evolution. The complex nature of this chemical diversity has previously been probed via directed analyses of a small number of compounds, identified through targeted assays rather than more comprehensive biochemical profiling approaches such as metabolomics. Insights into ecological and evolutionary relationships within bacterial genera can be derived through comparative analysis of broader secondary metabolite patterns, and this can also eventually assist biodiscovery search strategies for new natural products. Here, we investigated the species-level chemical diversity of the two marine actinobacterial species Salinispora arenicola and Salinispora pacifica, isolated from sponges distributed across the Great Barrier Reef (GBR), via their secondary metabolite profiles using LC-MS-based metabolomics. The chemical profiles of these two species were obtained by UHPLC-QToF-MS based metabolic profiling. The resultant data were interrogated using multivariate data analysis methods to compare their (bio)chemical profiles. We found a high level of inter-species diversity in strains from these two bacterial species. We also found rifamycins and saliniketals were produced exclusively by S. arenicola species, as the main secondary metabolites differentiating the two species. Furthermore, the discovery of 57 candidate compounds greatly increases the small number of secondary metabolites previously known to be produced by these species. In addition, we report the production of rifamycin O and W, a key group of ansamycin compounds, in S. arenicola for the first time. Species of the marine actinobacteria harbour a much wider spectrum of secondary metabolites than suspected, and this knowledge may prove a rich field for biodiscovery as well as a database for understanding relationships between speciation, evolution and chemical ecology.
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Affiliation(s)
- Utpal Bose
- School of Pharmacy, The University of Queensland, Brisbane, Queensland, Australia
| | | | - Miranda E. Vidgen
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, Queensland, Australia
| | - Yi Kai Ng
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, Queensland, Australia
| | - P. Nicholas Shaw
- School of Pharmacy, The University of Queensland, Brisbane, Queensland, Australia
| | - John A. Fuerst
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, Queensland, Australia
| | - Mark P. Hodson
- Metabolomics Australia, Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, Queensland, Australia
- * E-mail:
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142
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Isolation and characterization of novel alkali-halophilic actinomycetes from the Chilika brackish water lake, India. ANN MICROBIOL 2014. [DOI: 10.1007/s13213-014-0831-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
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143
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Duncan K, Haltli B, Gill KA, Kerr RG. Bioprospecting from marine sediments of New Brunswick, Canada: exploring the relationship between total bacterial diversity and actinobacteria diversity. Mar Drugs 2014; 12:899-925. [PMID: 24531187 PMCID: PMC3944522 DOI: 10.3390/md12020899] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2013] [Revised: 01/07/2014] [Accepted: 01/21/2014] [Indexed: 12/16/2022] Open
Abstract
Actinomycetes are an important resource for the discovery of natural products with therapeutic properties. Bioprospecting for actinomycetes typically proceeds without a priori knowledge of the bacterial diversity present in sampled habitats. In this study, we endeavored to determine if overall bacterial diversity in marine sediments, as determined by 16S rDNA amplicon pyrosequencing, could be correlated with culturable actinomycete diversity, and thus serve as a powerful tool in guiding future bioprospecting efforts. Overall bacterial diversity was investigated in eight marine sediments from four sites in New Brunswick, Canada, resulting in over 44,000 high quality sequences (x = 5610 per sample). Analysis revealed all sites exhibited significant diversity (H' = 5.4 to 6.7). Furthermore, statistical analysis of species level bacterial communities (D = 0.03) indicated community composition varied according to site and was strongly influenced by sediment physiochemical composition. In contrast, cultured actinomycetes (n = 466, 98.3% Streptomyces) were ubiquitously distributed among all sites and distribution was not influenced by sediment composition, suggesting that the biogeography of culturable actinomycetes does not correlate with overall bacterial diversity in the samples examined. These actinomycetes provide a resource for future secondary metabolite discovery, as exemplified by the antimicrobial activity observed from preliminary investigation.
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Affiliation(s)
- Katherine Duncan
- Department of Biomedical Sciences, University of Prince Edward Island, 550 University Avenue, Charlottetown, PE C1A 4P3, Canada.
| | - Bradley Haltli
- Department of Chemistry, University of Prince Edward Island, 550 University Avenue, Charlottetown, PE C1A 4P3, Canada.
| | - Krista A Gill
- Department of Chemistry, University of Prince Edward Island, 550 University Avenue, Charlottetown, PE C1A 4P3, Canada.
| | - Russell G Kerr
- Department of Biomedical Sciences, University of Prince Edward Island, 550 University Avenue, Charlottetown, PE C1A 4P3, Canada.
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144
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Öner Ö, Ekiz G, Hameş EE, Demir V, Gübe Ö, Özkaya FC, Yokeş MB, Uzel A, Bedir E. Cultivable Sponge-Associated Actinobacteria from Coastal Area of Eastern Mediterranean Sea. ACTA ACUST UNITED AC 2014. [DOI: 10.4236/aim.2014.46037] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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145
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John S, Ramasamy B. Bioprospecting of marine Streptomycetes sp. for its antagonistic activity on MDR Pseudomonas aeruginosa and Acinetobacter baumannii isolates. ASIAN PACIFIC JOURNAL OF TROPICAL DISEASE 2014. [DOI: 10.1016/s2222-1808(14)60458-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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146
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Acharyabhatta A, Kandula SK, Terli R. Taxonomy and Polyphasic Characterization of Alkaline Amylase Producing Marine Actinomycete Streptomyces rochei BTSS 1001. Int J Microbiol 2013; 2013:276921. [PMID: 24489548 PMCID: PMC3892758 DOI: 10.1155/2013/276921] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2013] [Accepted: 10/07/2013] [Indexed: 12/04/2022] Open
Abstract
Actinomycetes isolated from marine sediments along the southeast coast of Bay of Bengal were investigated for amylolytic activity. Marine actinomycete BTSS 1001 producing an alkaline amylase was identified from marine sediment of Diviseema coast, Bay of Bengal. The isolate produced alkaline amylase with maximum amylolytic activity at pH 9.5 at 50°C. The organism produced white to pale grey substrate mycelium and grayish aerial mycelium with pinkish brown pigmentation. A comprehensive study of morphological, physiological parameters, cultural characteristics, and biochemical studies was performed. The presence of iso-C15 : 0, anteiso-C15 : 0, iso-C16 : 0, and anteiso-C17 : 0 as the major cellular fatty acids, LL-diaminopimelic acid as the characteristic cell wall component, and menaquinones MK-9H(6) and MK-9H(8) as the major isoprenoid quinones is attributed to the strain BTSS 1001 belonging to the genus Streptomyces. Comparison of 16S rRNA gene sequences showed that strain BTSS 1001 exhibited the highest similarities to the type strains of Streptomyces rochei (99%), Streptomyces plicatus (99%), and Streptomyces enissocaesilis (99%). Using the polyphasic taxonomical approach and phenotypic characteristic studies, the isolate BTSS 1001 was characterized as marine actinomycete Streptomyces rochei.
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Affiliation(s)
- Aparna Acharyabhatta
- Department of Biotechnology, Dr. L. Bullayya College, New Resapuvanipalem, Visakhapatnam, Andhra Pradesh 530013, India
| | - Siva Kumar Kandula
- Department of Biotechnology, Andhra University, Visakhapatnam 530003, India
| | - Ramana Terli
- School of Life Sciences, GITAM University, Visakhapatnam 530045, India
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147
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Micromonospora jinlongensis sp. nov., isolated from muddy soil in China and emended description of the genus Micromonospora. Antonie van Leeuwenhoek 2013; 105:307-15. [DOI: 10.1007/s10482-013-0074-3] [Citation(s) in RCA: 147] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/28/2013] [Accepted: 11/08/2013] [Indexed: 11/27/2022]
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148
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Veyisoglu A, Sahin N. Streptomyces hoynatensis sp. nov., isolated from deep marine sediment. Int J Syst Evol Microbiol 2013; 64:819-826. [PMID: 24243968 DOI: 10.1099/ijs.0.055640-0] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
A novel actinobacterium, strain S1412(T), was isolated from a deep sediment sample, collected from the southern Black Sea coast of Turkey, and was examined using a polyphasic approach. The organism had chemical and morphological features typical of the genus Streptomyces. The cell wall of the novel strain contained ll-diaminopimelic acid. Whole-cell hydrolysates contained galactose, glucose and traces of xylose. The polar lipid profile of S1412(T) consisted of the predominant compound diphosphatidylglycerol, moderate amounts of phosphatidylethanolamine and phosphatidylinositol, and minor amounts of phosphatidylglycerol. Strain S1412(T) exhibited an unusual quinone system, with the predominant compounds MK-10(H8), MK-9(H8) and MK-10(H6) and small amounts of MK-9(H6) and MK-10(H4). Major fatty acids were iso-C16 : 0, iso-C16 : 1 H and anteiso-C17:0. The 16S rRNA gene sequence similarities for strain S1412(T) with respect to the most closely related type strains of species of the genus Streptomyces were less than 97.0%. Phenotypic data clearly distinguished the isolate from its closest relatives, Streptomyces specialis GW 41-1564(T), Streptomyces mayteni YIM 60475(T), Streptomyces hainanensis YIM 47672(T), Streptomyces avicenniae MCCC1A01535(T) and Streptomyces sedi YIM 65188(T). Based on chemotaxonomic, phenotypic and genotypic characteristics, strain S1412(T) is considered to represent a novel species of the genus Streptomyces, for which the name Streptomyces hoynatensis sp. nov. is proposed. The type strain is S1412(T) ( = KCTC 29097(T) = DSM 42069(T)).
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Affiliation(s)
- Aysel Veyisoglu
- Department of Biology, Faculty of Art and Science, Ondokuz Mayis University, 55139 Kurupelit-Samsun, Turkey
| | - Nevzat Sahin
- Department of Biology, Faculty of Art and Science, Ondokuz Mayis University, 55139 Kurupelit-Samsun, Turkey
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Djinni I, Defant A, Kecha M, Mancini I. Metabolite profile of marine-derived endophytic Streptomyces sundarbansensis WR1L1S8 by liquid chromatography-mass spectrometry and evaluation of culture conditions on antibacterial activity and mycelial growth. J Appl Microbiol 2013; 116:39-50. [PMID: 24118945 DOI: 10.1111/jam.12360] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2013] [Revised: 09/26/2013] [Accepted: 10/01/2013] [Indexed: 11/30/2022]
Abstract
AIMS This study was designed to investigate whether culture conditions (media, seawater concentration and pH) could lead Streptomyces sundarbansensis strain (isolated from marine brown algae Fucus sp. collected from Algerian coastline) to produce bioactive secondary metabolites. The most favourable condition for the production of anti-MRSA compound 1 [2-hydroxy-5-((6-hydroxy-4-oxo-4H-pyran-2-yl)methyl)-2-propylchroman-4-one] was determined. METHODS AND RESULTS The profile of metabolites present in the crude extracts was carried out by HPLC analysis equipped with a diode array detector evaporative light scattering detection (DAD-ELSD) or online coupled to electrospray ionization-mass spectrometry (ESI-MS). Compound 1 was the most abundant secondary metabolite by culturing the strains on starch casein agar (SCA) medium in freshwater or 50% seawater at pH 7 or 9 using agar-state fermentation method. CONCLUSIONS The study has shown the efficiency of HPLC/ESI-MS technique in the analysis of polyketides produced by the strain under investigation. It was possible to establish the best culture conditions for obtaining the most bioactive compound 1, previously isolated by the same strain. SIGNIFICANCE AND IMPACT OF THE STUDY Marine algae-actinobacteria associations are a particularly promising renewable system for the production of new antibacterial metabolites. Based on the promising bioactivity of the chemically characterized compound 1, the analytical methodology here applied has resulted as an effective approach for establishing its optimized production.
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Affiliation(s)
- I Djinni
- Bioorganic Chemistry Laboratory, Department of Physics, University of Trento, Povo, Italy; Laboratory of Applied Microbiology, Faculty of Nature Science and Life, University of Bejaia, Targa Ouzemmour, Bejaia, Algeria
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Salinispora arenicola from temperate marine sediments: new intra-species variations and atypical distribution of secondary metabolic genes. Antonie van Leeuwenhoek 2013; 105:207-19. [DOI: 10.1007/s10482-013-0067-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/26/2013] [Accepted: 10/24/2013] [Indexed: 11/30/2022]
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