1
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Agaras BC, Grossi CEM, Ulloa RM. Unveiling the Secrets of Calcium-Dependent Proteins in Plant Growth-Promoting Rhizobacteria: An Abundance of Discoveries Awaits. PLANTS (BASEL, SWITZERLAND) 2023; 12:3398. [PMID: 37836138 PMCID: PMC10574481 DOI: 10.3390/plants12193398] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2023] [Revised: 09/20/2023] [Accepted: 09/22/2023] [Indexed: 10/15/2023]
Abstract
The role of Calcium ions (Ca2+) is extensively documented and comprehensively understood in eukaryotic organisms. Nevertheless, emerging insights, primarily derived from studies on human pathogenic bacteria, suggest that this ion also plays a pivotal role in prokaryotes. In this review, our primary focus will be on unraveling the intricate Ca2+ toolkit within prokaryotic organisms, with particular emphasis on its implications for plant growth-promoting rhizobacteria (PGPR). We undertook an in silico exploration to pinpoint and identify some of the proteins described in the existing literature, including prokaryotic Ca2+ channels, pumps, and exchangers that are responsible for regulating intracellular Calcium concentration ([Ca2+]i), along with the Calcium-binding proteins (CaBPs) that play a pivotal role in sensing and transducing this essential cation. These investigations were conducted in four distinct PGPR strains: Pseudomonas chlororaphis subsp. aurantiaca SMMP3, P. donghuensis SVBP6, Pseudomonas sp. BP01, and Methylobacterium sp. 2A, which have been isolated and characterized within our research laboratories. We also present preliminary experimental data to evaluate the influence of exogenous Ca2+ concentrations ([Ca2+]ex) on the growth dynamics of these strains.
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Affiliation(s)
- Betina Cecilia Agaras
- Laboratory of Physiology and Genetics of Plant Probiotic Bacteria (LFGBBP), Centre of Biochemistry and Microbiology of Soils, National University of Quilmes, Bernal B1876BXD, Argentina
- National Scientific and Technical Research Council (CONICET), Buenos Aires C1425FQB, Argentina;
| | - Cecilia Eugenia María Grossi
- National Scientific and Technical Research Council (CONICET), Buenos Aires C1425FQB, Argentina;
- Laboratory of Plant Signal Transduction, Institute of Genetic Engineering and Molecular Biology (INGEBI), National Scientific and Technical Research Council (CONICET), Buenos Aires C1425FQB, Argentina
| | - Rita María Ulloa
- National Scientific and Technical Research Council (CONICET), Buenos Aires C1425FQB, Argentina;
- Laboratory of Plant Signal Transduction, Institute of Genetic Engineering and Molecular Biology (INGEBI), National Scientific and Technical Research Council (CONICET), Buenos Aires C1425FQB, Argentina
- Biochemistry Department, Faculty of Exact and Natural Sciences, University of Buenos Aires (FCEN-UBA), Buenos Aires C1428EGA, Argentina
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2
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Tang SK, Zhi XY, Zhang Y, Makarova KS, Liu BB, Zheng GS, Zhang ZP, Zheng HJ, Wolf YI, Zhao YR, Jiang SH, Chen XM, Li EY, Zhang T, Chen PR, Feng YZ, Xiang MX, Lin ZQ, Shi JH, Chang C, Zhang X, Li R, Lou K, Wang Y, Chang L, Yin M, Yang LL, Gao HY, Zhang ZK, Tao TS, Guan TW, He FC, Lu YH, Cui HL, Koonin EV, Zhao GP, Xu P. Cellular differentiation into hyphae and spores in halophilic archaea. Nat Commun 2023; 14:1827. [PMID: 37005419 PMCID: PMC10067837 DOI: 10.1038/s41467-023-37389-w] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2022] [Accepted: 03/14/2023] [Indexed: 04/04/2023] Open
Abstract
Several groups of bacteria have complex life cycles involving cellular differentiation and multicellular structures. For example, actinobacteria of the genus Streptomyces form multicellular vegetative hyphae, aerial hyphae, and spores. However, similar life cycles have not yet been described for archaea. Here, we show that several haloarchaea of the family Halobacteriaceae display a life cycle resembling that of Streptomyces bacteria. Strain YIM 93972 (isolated from a salt marsh) undergoes cellular differentiation into mycelia and spores. Other closely related strains are also able to form mycelia, and comparative genomic analyses point to gene signatures (apparent gain or loss of certain genes) that are shared by members of this clade within the Halobacteriaceae. Genomic, transcriptomic and proteomic analyses of non-differentiating mutants suggest that a Cdc48-family ATPase might be involved in cellular differentiation in strain YIM 93972. Additionally, a gene encoding a putative oligopeptide transporter from YIM 93972 can restore the ability to form hyphae in a Streptomyces coelicolor mutant that carries a deletion in a homologous gene cluster (bldKA-bldKE), suggesting functional equivalence. We propose strain YIM 93972 as representative of a new species in a new genus within the family Halobacteriaceae, for which the name Actinoarchaeum halophilum gen. nov., sp. nov. is herewith proposed. Our demonstration of a complex life cycle in a group of haloarchaea adds a new dimension to our understanding of the biological diversity and environmental adaptation of archaea.
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Affiliation(s)
- Shu-Kun Tang
- Yunnan Institute of Microbiology, Key Laboratory for Microbial Resources of the Ministry of Education, School of Life Sciences, Yunnan University, Kunming, 650091, China.
| | - Xiao-Yang Zhi
- Yunnan Institute of Microbiology, Key Laboratory for Microbial Resources of the Ministry of Education, School of Life Sciences, Yunnan University, Kunming, 650091, China
| | - Yao Zhang
- State Key Laboratory of Proteomics, Beijing Proteome Research Center, National Center for Protein Sciences Beijing, Research Unit of Proteomics & Research and Development of New Drug,Research Unit of Proteomics Driven Cancer Precision Medicine, Chinese Academy of Medical Sciences, Institute of Lifeomics, Beijing, 102206, China
| | - Kira S Makarova
- National Center for Biotechnology Information, National Library of Medicine, National Institutes of Health, 8600 Rockville Pike, Bethesda, MD, 20894, USA
| | - Bing-Bing Liu
- Yunnan Institute of Microbiology, Key Laboratory for Microbial Resources of the Ministry of Education, School of Life Sciences, Yunnan University, Kunming, 650091, China
- Henan Key Laboratory of Industrial Microbial Resources and Fermentation Technology, College of Biological and Chemical Engineering, Nanyang Institute of Technology, Nanyang, 473004, China
| | - Guo-Song Zheng
- College of Life Sciences, Shanghai Normal University, Shanghai, 200234, China
| | - Zhen-Peng Zhang
- State Key Laboratory of Proteomics, Beijing Proteome Research Center, National Center for Protein Sciences Beijing, Research Unit of Proteomics & Research and Development of New Drug,Research Unit of Proteomics Driven Cancer Precision Medicine, Chinese Academy of Medical Sciences, Institute of Lifeomics, Beijing, 102206, China
| | - Hua-Jun Zheng
- Shanghai-MOST Key Laboratory of Health and Disease Genomics, Chinese National Human Genome Center at Shanghai and Shanghai Institute for Biomedical and Pharmaceutical Technologies, Shanghai, 201203, China
| | - Yuri I Wolf
- National Center for Biotechnology Information, National Library of Medicine, National Institutes of Health, 8600 Rockville Pike, Bethesda, MD, 20894, USA
| | - Yu-Rong Zhao
- Yunnan Institute of Microbiology, Key Laboratory for Microbial Resources of the Ministry of Education, School of Life Sciences, Yunnan University, Kunming, 650091, China
| | - Song-Hao Jiang
- State Key Laboratory of Proteomics, Beijing Proteome Research Center, National Center for Protein Sciences Beijing, Research Unit of Proteomics & Research and Development of New Drug,Research Unit of Proteomics Driven Cancer Precision Medicine, Chinese Academy of Medical Sciences, Institute of Lifeomics, Beijing, 102206, China
- Hebei Province Key Lab of Research and Application on Microbial Diversity, College of Life Sciences, Hebei University, Hebei, 071002, China
| | - Xi-Ming Chen
- Key Laboratory of Desert and Desertification, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, 730000, China
| | - En-Yuan Li
- Yunnan Institute of Microbiology, Key Laboratory for Microbial Resources of the Ministry of Education, School of Life Sciences, Yunnan University, Kunming, 650091, China
| | - Tao Zhang
- State Key Laboratory of Proteomics, Beijing Proteome Research Center, National Center for Protein Sciences Beijing, Research Unit of Proteomics & Research and Development of New Drug,Research Unit of Proteomics Driven Cancer Precision Medicine, Chinese Academy of Medical Sciences, Institute of Lifeomics, Beijing, 102206, China
| | - Pei-Ru Chen
- State Key Laboratory of Proteomics, Beijing Proteome Research Center, National Center for Protein Sciences Beijing, Research Unit of Proteomics & Research and Development of New Drug,Research Unit of Proteomics Driven Cancer Precision Medicine, Chinese Academy of Medical Sciences, Institute of Lifeomics, Beijing, 102206, China
- Hebei Province Key Lab of Research and Application on Microbial Diversity, College of Life Sciences, Hebei University, Hebei, 071002, China
| | - Yu-Zhou Feng
- Yunnan Institute of Microbiology, Key Laboratory for Microbial Resources of the Ministry of Education, School of Life Sciences, Yunnan University, Kunming, 650091, China
| | - Ming-Xian Xiang
- Yunnan Institute of Microbiology, Key Laboratory for Microbial Resources of the Ministry of Education, School of Life Sciences, Yunnan University, Kunming, 650091, China
| | - Zhi-Qian Lin
- Yunnan Institute of Microbiology, Key Laboratory for Microbial Resources of the Ministry of Education, School of Life Sciences, Yunnan University, Kunming, 650091, China
| | - Jia-Hui Shi
- State Key Laboratory of Proteomics, Beijing Proteome Research Center, National Center for Protein Sciences Beijing, Research Unit of Proteomics & Research and Development of New Drug,Research Unit of Proteomics Driven Cancer Precision Medicine, Chinese Academy of Medical Sciences, Institute of Lifeomics, Beijing, 102206, China
- Hebei Province Key Lab of Research and Application on Microbial Diversity, College of Life Sciences, Hebei University, Hebei, 071002, China
| | - Cheng Chang
- State Key Laboratory of Proteomics, Beijing Proteome Research Center, National Center for Protein Sciences Beijing, Research Unit of Proteomics & Research and Development of New Drug,Research Unit of Proteomics Driven Cancer Precision Medicine, Chinese Academy of Medical Sciences, Institute of Lifeomics, Beijing, 102206, China
| | - Xue Zhang
- Henan Key Laboratory of Industrial Microbial Resources and Fermentation Technology, College of Biological and Chemical Engineering, Nanyang Institute of Technology, Nanyang, 473004, China
| | - Rui Li
- Yunnan Institute of Microbiology, Key Laboratory for Microbial Resources of the Ministry of Education, School of Life Sciences, Yunnan University, Kunming, 650091, China
| | - Kai Lou
- Xinjiang Institute of Microbiology, Xinjiang Academy of Agricultural Science, Urumqi, 830091, China
| | - Yun Wang
- Xinjiang Institute of Microbiology, Xinjiang Academy of Agricultural Science, Urumqi, 830091, China
| | - Lei Chang
- State Key Laboratory of Proteomics, Beijing Proteome Research Center, National Center for Protein Sciences Beijing, Research Unit of Proteomics & Research and Development of New Drug,Research Unit of Proteomics Driven Cancer Precision Medicine, Chinese Academy of Medical Sciences, Institute of Lifeomics, Beijing, 102206, China
| | - Min Yin
- Yunnan Institute of Microbiology, Key Laboratory for Microbial Resources of the Ministry of Education, School of Life Sciences, Yunnan University, Kunming, 650091, China
| | - Ling-Ling Yang
- Yunnan Institute of Microbiology, Key Laboratory for Microbial Resources of the Ministry of Education, School of Life Sciences, Yunnan University, Kunming, 650091, China
| | - Hui-Ying Gao
- State Key Laboratory of Proteomics, Beijing Proteome Research Center, National Center for Protein Sciences Beijing, Research Unit of Proteomics & Research and Development of New Drug,Research Unit of Proteomics Driven Cancer Precision Medicine, Chinese Academy of Medical Sciences, Institute of Lifeomics, Beijing, 102206, China
| | - Zhong-Kai Zhang
- Biotechnology and Genetic Germplasm Resources Research Institute, Yunnan Academy of Agricultural Sciences, Kunming, 650205, China
| | - Tian-Shen Tao
- Department of Microbiology, Key Laboratory of Combinatorial Biosynthesis and Drug Discovery of Ministry of Education, School of Pharmaceutical Sciences, Wuhan University, Wuhan, 430072, China
| | - Tong-Wei Guan
- College of Food and Biological Engineering, Xihua University, Chengdu, 610039, China
| | - Fu-Chu He
- State Key Laboratory of Proteomics, Beijing Proteome Research Center, National Center for Protein Sciences Beijing, Research Unit of Proteomics & Research and Development of New Drug,Research Unit of Proteomics Driven Cancer Precision Medicine, Chinese Academy of Medical Sciences, Institute of Lifeomics, Beijing, 102206, China
| | - Yin-Hua Lu
- College of Life Sciences, Shanghai Normal University, Shanghai, 200234, China
| | - Heng-Lin Cui
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang, 212013, China
| | - Eugene V Koonin
- National Center for Biotechnology Information, National Library of Medicine, National Institutes of Health, 8600 Rockville Pike, Bethesda, MD, 20894, USA.
| | - Guo-Ping Zhao
- Key Laboratory of Medical Molecular Virology (MOE/NHC/CAMS), School of Basic Medical Sciences and Department of Microbiology and Microbial Engineering, School of Life Sciences, Fudan University, Shanghai, 200032, China.
| | - Ping Xu
- State Key Laboratory of Proteomics, Beijing Proteome Research Center, National Center for Protein Sciences Beijing, Research Unit of Proteomics & Research and Development of New Drug,Research Unit of Proteomics Driven Cancer Precision Medicine, Chinese Academy of Medical Sciences, Institute of Lifeomics, Beijing, 102206, China.
- Hebei Province Key Lab of Research and Application on Microbial Diversity, College of Life Sciences, Hebei University, Hebei, 071002, China.
- Department of Microbiology, Key Laboratory of Combinatorial Biosynthesis and Drug Discovery of Ministry of Education, School of Pharmaceutical Sciences, Wuhan University, Wuhan, 430072, China.
- Guizhou University, School of Medicine, Guiyang, 550025, China.
- State Key Laboratory of Dampness Syndrome of Chinese Medicine, The Second Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou, 510120, China.
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3
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Beskrovnaya P, Sexton DL, Golmohammadzadeh M, Hashimi A, Tocheva EI. Structural, Metabolic and Evolutionary Comparison of Bacterial Endospore and Exospore Formation. Front Microbiol 2021; 12:630573. [PMID: 33767680 PMCID: PMC7985256 DOI: 10.3389/fmicb.2021.630573] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2020] [Accepted: 02/15/2021] [Indexed: 12/20/2022] Open
Abstract
Sporulation is a specialized developmental program employed by a diverse set of bacteria which culminates in the formation of dormant cells displaying increased resilience to stressors. This represents a major survival strategy for bacteria facing harsh environmental conditions, including nutrient limitation, heat, desiccation, and exposure to antimicrobial compounds. Through dispersal to new environments via biotic or abiotic factors, sporulation provides a means for disseminating genetic material and promotes encounters with preferable environments thus promoting environmental selection. Several types of bacterial sporulation have been characterized, each involving numerous morphological changes regulated and performed by non-homologous pathways. Despite their likely independent evolutionary origins, all known modes of sporulation are typically triggered by limited nutrients and require extensive membrane and peptidoglycan remodeling. While distinct modes of sporulation have been observed in diverse species, two major types are at the forefront of understanding the role of sporulation in human health, and microbial population dynamics and survival. Here, we outline endospore and exospore formation by members of the phyla Firmicutes and Actinobacteria, respectively. Using recent advances in molecular and structural biology, we point to the regulatory, genetic, and morphological differences unique to endo- and exospore formation, discuss shared characteristics that contribute to the enhanced environmental survival of spores and, finally, cover the evolutionary aspects of sporulation that contribute to bacterial species diversification.
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Affiliation(s)
| | | | | | | | - Elitza I. Tocheva
- Department of Microbiology and Immunology, Life Sciences Institute, Health Sciences Mall, The University of British Columbia, Vancouver, BC, Canada
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4
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Sexton DL, Tocheva EI. Ultrastructure of Exospore Formation in Streptomyces Revealed by Cryo-Electron Tomography. Front Microbiol 2020; 11:581135. [PMID: 33072052 PMCID: PMC7541840 DOI: 10.3389/fmicb.2020.581135] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2020] [Accepted: 09/04/2020] [Indexed: 02/02/2023] Open
Abstract
Many bacteria form spores in response to adverse environmental conditions. Several sporulation pathways have evolved independently and occur through distinctive mechanisms. Here, using cryo-electron tomography (cryo-ET), we examine all stages of growth and exospore formation in the model organism Streptomyces albus. Our data reveal the native ultrastructure of vegetative hyphae, including the likely structures of the polarisome and cytoskeletal filaments. In addition, we observed septal junctions in vegetative septa, predicted to be involved in protein and DNA translocation between neighboring cells. During sporulation, the cell envelope undergoes dramatic remodeling, including the formation of a spore wall and two protective proteinaceous layers. Mature spores reveal the presence of a continuous spore coat and an irregular rodlet sheet. Together, these results provide an unprecedented examination of the ultrastructure in Streptomyces and further our understanding of the structural complexity of exospore formation.
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Affiliation(s)
- Danielle L Sexton
- Department of Microbiology & Immunology, Life Sciences Institute, The University of British Columbia, Vancouver, BC, Canada
| | - Elitza I Tocheva
- Department of Microbiology & Immunology, Life Sciences Institute, The University of British Columbia, Vancouver, BC, Canada
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5
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Sexton DL, Herlihey FA, Brott AS, Crisante DA, Shepherdson E, Clarke AJ, Elliot MA. Roles of LysM and LytM domains in resuscitation-promoting factor (Rpf) activity and Rpf-mediated peptidoglycan cleavage and dormant spore reactivation. J Biol Chem 2020; 295:9171-9182. [PMID: 32434927 PMCID: PMC7335776 DOI: 10.1074/jbc.ra120.013994] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2020] [Revised: 05/15/2020] [Indexed: 11/06/2022] Open
Abstract
Bacterial dormancy can take many forms, including formation of Bacillus endospores, Streptomyces exospores, and metabolically latent Mycobacterium cells. In the actinobacteria, including the streptomycetes and mycobacteria, the rapid resuscitation from a dormant state requires the activities of a family of cell-wall lytic enzymes called resuscitation-promoting factors (Rpfs). Whether Rpf activity promotes resuscitation by generating peptidoglycan fragments (muropeptides) that function as signaling molecules for spore germination or by simply remodeling the dormant cell wall has been the subject of much debate. Here, to address this question, we used mutagenesis and peptidoglycan binding and cleavage assays to first gain broader insight into the biochemical function of diverse Rpf enzymes. We show that their LysM and LytM domains enhance Rpf enzyme activity; their LytM domain and, in some cases their LysM domain, also promoted peptidoglycan binding. We further demonstrate that the Rpfs function as endo-acting lytic transglycosylases, cleaving within the peptidoglycan backbone. We also found that unlike in other systems, Rpf activity in the streptomycetes is not correlated with peptidoglycan-responsive Ser/Thr kinases for cell signaling, and the germination of rpf mutant strains could not be stimulated by the addition of known germinants. Collectively, these results suggest that in Streptomyces, Rpfs have a structural rather than signaling function during spore germination, and that in the actinobacteria, any signaling function associated with spore resuscitation requires the activity of additional yet to be identified enzymes.
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Affiliation(s)
- Danielle L Sexton
- Michael G. DeGroote Institute for Infectious Disease Research and Department of Biology, McMaster University, Hamilton, Canada
| | - Francesca A Herlihey
- Department of Molecular and Cellular Biology, University of Guelph, Guelph, Canada
| | - Ashley S Brott
- Department of Molecular and Cellular Biology, University of Guelph, Guelph, Canada
| | - David A Crisante
- Michael G. DeGroote Institute for Infectious Disease Research and Department of Biology, McMaster University, Hamilton, Canada
| | - Evan Shepherdson
- Michael G. DeGroote Institute for Infectious Disease Research and Department of Biology, McMaster University, Hamilton, Canada
| | - Anthony J Clarke
- Department of Molecular and Cellular Biology, University of Guelph, Guelph, Canada
| | - Marie A Elliot
- Michael G. DeGroote Institute for Infectious Disease Research and Department of Biology, McMaster University, Hamilton, Canada.
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6
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Stroe MC, Netzker T, Scherlach K, Krüger T, Hertweck C, Valiante V, Brakhage AA. Targeted induction of a silent fungal gene cluster encoding the bacteria-specific germination inhibitor fumigermin. eLife 2020; 9:52541. [PMID: 32083553 PMCID: PMC7034978 DOI: 10.7554/elife.52541] [Citation(s) in RCA: 43] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2019] [Accepted: 02/09/2020] [Indexed: 12/29/2022] Open
Abstract
Microorganisms produce numerous secondary metabolites (SMs) with various biological activities. Many of their encoding gene clusters are silent under standard laboratory conditions because for their activation they need the ecological context, such as the presence of other microorganisms. The true ecological function of most SMs remains obscure, but understanding of both the activation of silent gene clusters and the ecological function of the produced compounds is of importance to reveal functional interactions in microbiomes. Here, we report the identification of an as-yet uncharacterized silent gene cluster of the fungus Aspergillus fumigatus, which is activated by the bacterium Streptomyces rapamycinicus during the bacterial-fungal interaction. The resulting natural product is the novel fungal metabolite fumigermin, the biosynthesis of which requires the polyketide synthase FgnA. Fumigermin inhibits germination of spores of the inducing S. rapamycinicus, and thus helps the fungus to defend resources in the shared habitat against a bacterial competitor.
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Affiliation(s)
- Maria Cristina Stroe
- Department of Molecular and Applied Microbiology, Leibniz Institute for Natural Product Research and Infection Biology (HKI), Jena, Germany.,Institute of Microbiology, Friedrich Schiller University Jena, Jena, Germany
| | - Tina Netzker
- Department of Molecular and Applied Microbiology, Leibniz Institute for Natural Product Research and Infection Biology (HKI), Jena, Germany
| | | | - Thomas Krüger
- Department of Molecular and Applied Microbiology, Leibniz Institute for Natural Product Research and Infection Biology (HKI), Jena, Germany
| | - Christian Hertweck
- Institute of Microbiology, Friedrich Schiller University Jena, Jena, Germany.,Department of Biomolecular Chemistry, HKI, Jena, Germany
| | - Vito Valiante
- Leibniz Research Group - Biobricks of Microbial Natural Product Syntheses, HKI, Jena, Germany
| | - Axel A Brakhage
- Department of Molecular and Applied Microbiology, Leibniz Institute for Natural Product Research and Infection Biology (HKI), Jena, Germany.,Institute of Microbiology, Friedrich Schiller University Jena, Jena, Germany
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7
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Čihák M, Kameník Z, Šmídová K, Bergman N, Benada O, Kofroňová O, Petříčková K, Bobek J. Secondary Metabolites Produced during the Germination of Streptomyces coelicolor. Front Microbiol 2017; 8:2495. [PMID: 29326665 PMCID: PMC5733532 DOI: 10.3389/fmicb.2017.02495] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2017] [Accepted: 11/30/2017] [Indexed: 11/16/2022] Open
Abstract
Spore awakening is a series of actions that starts with purely physical processes and continues via the launching of gene expression and metabolic activities, eventually achieving a vegetative phase of growth. In spore-forming microorganisms, the germination process is controlled by intra- and inter-species communication. However, in the Streptomyces clade, which is capable of developing a plethora of valuable compounds, the chemical signals produced during germination have not been systematically studied before. Our previously published data revealed that several secondary metabolite biosynthetic genes are expressed during germination. Therefore, we focus here on the secondary metabolite production during this developmental stage. Using high-performance liquid chromatography-mass spectrometry, we found that the sesquiterpenoid antibiotic albaflavenone, the polyketide germicidin A, and chalcone are produced during germination of the model streptomycete, S. coelicolor. Interestingly, the last two compounds revealed an inhibitory effect on the germination process. The secondary metabolites originating from the early stage of microbial growth may coordinate the development of the producer (quorum sensing) and/or play a role in competitive microflora repression (quorum quenching) in their nature environments.
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Affiliation(s)
- Matouš Čihák
- First Faculty of Medicine, Institute of Immunology and Microbiology, Charles University, Prague, Czechia
| | - Zdeněk Kameník
- Institute of Microbiology, The Czech Academy of Sciences, Prague, Czechia
| | - Klára Šmídová
- First Faculty of Medicine, Institute of Immunology and Microbiology, Charles University, Prague, Czechia.,Institute of Microbiology, The Czech Academy of Sciences, Prague, Czechia
| | - Natalie Bergman
- Chemistry Department, Faculty of Science, J. E. Purkinje University, Ústí nad Labem, Czechia
| | - Oldřich Benada
- Institute of Microbiology, The Czech Academy of Sciences, Prague, Czechia.,Chemistry Department, Faculty of Science, J. E. Purkinje University, Ústí nad Labem, Czechia
| | - Olga Kofroňová
- Institute of Microbiology, The Czech Academy of Sciences, Prague, Czechia
| | - Kateřina Petříčková
- First Faculty of Medicine, Institute of Immunology and Microbiology, Charles University, Prague, Czechia
| | - Jan Bobek
- First Faculty of Medicine, Institute of Immunology and Microbiology, Charles University, Prague, Czechia.,Institute of Microbiology, The Czech Academy of Sciences, Prague, Czechia.,Chemistry Department, Faculty of Science, J. E. Purkinje University, Ústí nad Labem, Czechia
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8
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Bobek J, Šmídová K, Čihák M. A Waking Review: Old and Novel Insights into the Spore Germination in Streptomyces. Front Microbiol 2017; 8:2205. [PMID: 29180988 PMCID: PMC5693915 DOI: 10.3389/fmicb.2017.02205] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2017] [Accepted: 10/26/2017] [Indexed: 01/02/2023] Open
Abstract
The complex development undergone by Streptomyces encompasses transitions from vegetative mycelial forms to reproductive aerial hyphae that differentiate into chains of single-celled spores. Whereas their mycelial life – connected with spore formation and antibiotic production – is deeply investigated, spore germination as the counterpoint in their life cycle has received much less attention. Still, germination represents a system of transformation from metabolic zero point to a new living lap. There are several aspects of germination that may attract our attention: (1) Dormant spores are strikingly well-prepared for the future metabolic restart; they possess stable transcriptome, hydrolytic enzymes, chaperones, and other required macromolecules stabilized in a trehalose milieu; (2) Germination itself is a specific sequence of events leading to a complete morphological remodeling that include spore swelling, cell wall reconstruction, and eventually germ tube emergences; (3) Still not fully unveiled are the strategies that enable the process, including a single cell’s signal transduction and gene expression control, as well as intercellular communication and the probability of germination across the whole population. This review summarizes our current knowledge about the germination process in Streptomyces, while focusing on the aforementioned points.
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Affiliation(s)
- Jan Bobek
- Institute of Immunology and Microbiology, First Faculty of Medicine, Charles University, Prague, Czechia.,Chemistry Department, Faculty of Science, Jan Evangelista Purkyně University in Ústí nad Labem, Ústí nad Labem, Czechia.,Institute of Microbiology of the Czech Academy of Sciences, Prague, Czechia
| | - Klára Šmídová
- Institute of Immunology and Microbiology, First Faculty of Medicine, Charles University, Prague, Czechia.,Institute of Microbiology of the Czech Academy of Sciences, Prague, Czechia
| | - Matouš Čihák
- Institute of Immunology and Microbiology, First Faculty of Medicine, Charles University, Prague, Czechia
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9
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Yagüe P, López-García MT, Rioseras B, Sánchez J, Manteca A. Pre-sporulation stages of Streptomyces differentiation: state-of-the-art and future perspectives. FEMS Microbiol Lett 2013; 342:79-88. [PMID: 23496097 DOI: 10.1111/1574-6968.12128] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2013] [Accepted: 03/12/2013] [Indexed: 11/30/2022] Open
Abstract
Streptomycetes comprise very important industrial bacteria, producing two-thirds of all clinically relevant secondary metabolites. They are mycelial microorganisms with complex developmental cycles that include programmed cell death (PCD) and sporulation. Industrial fermentations are usually performed in liquid cultures (large bioreactors), conditions in which Streptomyces strains generally do not sporulate, and it was traditionally assumed that there was no differentiation. In this work, we review the current knowledge on Streptomyces pre-sporulation stages of Streptomyces differentiation.
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Affiliation(s)
- Paula Yagüe
- Área de Microbiología, Departamento de Biología Funcional, and IUBA, Facultad de Medicina, Universidad de Oviedo, Oviedo, Spain
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10
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Lamp J, Weber M, Cingöz G, Ortiz de Orué Lucana D, Schrempf H. A Streptomyces-specific member of the metallophosphatase superfamily contributes to spore dormancy and interaction with Aspergillus proliferans. FEMS Microbiol Lett 2013; 342:89-97. [PMID: 23480800 DOI: 10.1111/1574-6968.12121] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2013] [Revised: 03/01/2013] [Accepted: 03/04/2013] [Indexed: 11/27/2022] Open
Abstract
We have identified, cloned and characterized a formerly unknown protein from Streptomyces lividans spores. The deduced protein belongs to a novel member of the metallophosphatase superfamily and contains a phosphatase domain and predicted binding sites for divalent ions. Very close relatives are encoded in the genomic DNA of many different Streptomyces species. As the deduced related homologues diverge from other known phosphatase types, we named the protein MptS (metallophosphatase type from Streptomyces). Comparative physiological and biochemical investigations and analyses by fluorescence microscopy of the progenitor strain, designed mutants carrying either a disruption of the mptS gene or the reintroduced gene as fusion with histidine codons or the egfp gene led to the following results: (i) the mptS gene is transcribed in the course of aerial mycelia formation. (ii) The MptS protein is produced during the late stages of growth, (iii) accumulates within spores, (iv) functions as an active enzyme that releases inorganic phosphate from an artificial model substrate, (v) is required for spore dormancy and (vi) MptS supports the interaction amongst Streptomyces lividans spores with conidia of the fungus Aspergillus proliferans. We discuss the possible role(s) of MptS-dependent enzymatic activity and the implications for spore biology.
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Affiliation(s)
- Jessica Lamp
- FB Biologie/Chemie, Universität Osnabrück, Osnabrück 49069, Germany
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11
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de Jong W, Manteca A, Sanchez J, Bucca G, Smith CP, Dijkhuizen L, Claessen D, Wösten HAB. NepA is a structural cell wall protein involved in maintenance of spore dormancy inStreptomyces coelicolor. Mol Microbiol 2009; 71:1591-603. [DOI: 10.1111/j.1365-2958.2009.06633.x] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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12
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CabC, an EF-hand calcium-binding protein, is involved in Ca2+-mediated regulation of spore germination and aerial hypha formation in Streptomyces coelicolor. J Bacteriol 2008; 190:4061-8. [PMID: 18375559 DOI: 10.1128/jb.01954-07] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
Ca(2+) was reported to regulate spore germination and aerial hypha formation in streptomycetes; the underlying mechanism of this regulation is not known. cabC, a gene encoding an EF-hand calcium-binding protein, was disrupted or overexpressed in Streptomyces coelicolor M145. On R5- agar, the disruption of cabC resulted in denser aerial hyphae with more short branches, swollen hyphal tips, and early-germinating spores on the spore chain, while cabC overexpression significantly delayed development. Manipulation of the Ca(2+) concentration in R5- agar could reverse the phenotypes of cabC disruption or overexpression mutants and mimic mutant phenotypes with M145, suggesting that the mutant phenotypes were due to changes in the intracellular Ca(2+) concentration. CabC expression was strongly activated in aerial hyphae, as determined by Western blotting against CabC and confocal laser scanning microscopy detection of CabC::enhanced green fluorescent protein (EGFP). CabC::EGFP fusion proteins were evenly distributed in substrate mycelia, aerial mycelia, and spores. Taken together, these results demonstrate that CabC is involved in Ca(2+)-mediated regulation of spore germination and aerial hypha formation in S. coelicolor. CabC most likely acts as a Ca(2+) buffer and exerts its regulatory effects by controlling the intracellular Ca(2+) concentration.
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13
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Piette A, Derouaux A, Gerkens P, Noens EEE, Mazzucchelli G, Vion S, Koerten HK, Titgemeyer F, De Pauw E, Leprince P, van Wezel GP, Galleni M, Rigali S. From dormant to germinating spores of Streptomyces coelicolor A3(2): new perspectives from the crp null mutant. J Proteome Res 2006; 4:1699-708. [PMID: 16212423 DOI: 10.1021/pr050155b] [Citation(s) in RCA: 64] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The complete understanding of the morphological differentiation of streptomycetes is an ambitious challenge as diverse sensors and pathways sensitive to various environmental stimuli control the process. Germination occupies a particular position in the life cycle as the good achievement of the process depends on events occurring both during the preceding sporulation and during germination per se. The cyclic AMP receptor protein (crp) null mutant of Streptomyces coelicolor, affected in both sporulation and germination, was therefore presented as a privileged candidate to highlight new proteins involved in the shift from dormant to germinating spores. Our multidisciplinary approach-combining in vivo data, the analysis of spores morphological properties, and a proteome study-has shown that Crp is a central regulatory protein of the life cycle in S. coelicolor; and has identified spores proteins with statistically significant increased or decreased expression that should be listed as priority targets for further investigations on proteins that trigger both ends of the life cycle.
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Affiliation(s)
- André Piette
- Centre d'Ingénierie des Protéines, Université de Liège, Institut de Chimie B6a, Sart-Tilman, B-4000 Liège, Belgium
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14
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Derouaux A, Dehareng D, Lecocq E, Halici S, Nothaft H, Giannotta F, Moutzourelis G, Dusart J, Devreese B, Titgemeyer F, Van Beeumen J, Rigali S. Crp of Streptomyces coelicolor is the third transcription factor of the large CRP-FNR superfamily able to bind cAMP. Biochem Biophys Res Commun 2005; 325:983-90. [PMID: 15541386 DOI: 10.1016/j.bbrc.2004.10.143] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2004] [Indexed: 10/26/2022]
Abstract
The chromosomal inactivation of the unique transcription factor of Streptomyces coelicolor that displays a cyclic-nucleotide-binding domain, Crp(Sco), led to a germination-defective phenotype similar to the mutant of the adenylate cyclase gene (cya) unable to produce cAMP. By means of cAMP affinity chromatography we demonstrate the specific cAMP-binding ability of Crp(Sco), which definitely demonstrate that a Cya/cAMP/Crp system is used to trigger germination in S. coelicolor. However, electromobility shift assays with the purified Crp(Sco)-cAMP complex and the CRP-like cis-acting element of its own promoter failed. Moreover, we were unable to complement an Escherichia coli crp mutant in trans with Crp(Sco). The fact that Vfr from Pseudomonas aeruginosa and GlxR from Corynebacterium glutamicum could complement such an E. coli mutant suggests that the way Crp(Sco) interacts with DNA should mechanistically differ from its most similar members. This hypothesis was further supported by homology modelling of Crp(Sco) that confirmed an unusual organisation of the DNA-binding domain compared to the situation observed in Crp(Eco).
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Affiliation(s)
- Adeline Derouaux
- Centre d'Ingénierie des Protéines, Université de Liège, Institut de Chimie B6a, B-4000 Liège, Belgium
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15
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Demain AL, Fang A. The natural functions of secondary metabolites. ADVANCES IN BIOCHEMICAL ENGINEERING/BIOTECHNOLOGY 2001; 69:1-39. [PMID: 11036689 DOI: 10.1007/3-540-44964-7_1] [Citation(s) in RCA: 180] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
Abstract
Secondary metabolites, including antibiotics, are produced in nature and serve survival functions for the organisms producing them. The antibiotics are a heterogeneous group, the functions of some being related to and others being unrelated to their antimicrobial activities. Secondary metabolites serve: (i) as competitive weapons used against other bacteria, fungi, amoebae, plants, insects, and large animals; (ii) as metal transporting agents; (iii) as agents of symbiosis between microbes and plants, nematodes, insects, and higher animals; (iv) as sexual hormones; and (v) as differentiation effectors. Although antibiotics are not obligatory for sporulation, some secondary metabolites (including antibiotics) stimulate spore formation and inhibit or stimulate germination. Formation of secondary metabolites and spores are regulated by similar factors. This similarity could insure secondary metabolite production during sporulation. Thus the secondary metabolite can: (i) slow down germination of spores until a less competitive environment and more favorable conditions for growth exist; (ii) protect the dormant or initiated spore from consumption by amoebae; or (iii) cleanse the immediate environment of competing microorganisms during germination.
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Affiliation(s)
- A L Demain
- Department of Biology, Massachusetts Institute of Technology, Cambridge 02139, USA.
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16
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Matthews HA. Early impressions concerning actinomycetal infections that may play a role in the pathogenesis of eosinophilia-myalgia syndrome (EMS) and other 'new illnesses'. Med Hypotheses 1992; 38:25-45. [PMID: 1614356 DOI: 10.1016/0306-9877(92)90155-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Actinomycetal infections by Actinomyces, Nocardia, and Streptomyces appear to be increasing in incidence. Clinical and laboratory data from twelve patients believed to have subclinical actinomycete-streptomycete infections (ASI)* are presented. It is proposed that the recent epidemic of eosinophilia-myalgia syndrome (EMS) may have been caused by pre-existing host ASI that generated toxic agents when individuals ingested supplemental L-tryptophan (LT). LT is the substrate used by streptomycetes to synthesize actinomycins, extremely cytotoxic metabolites that could have accounted for symptoms seen in EMS. Actinomycins inhibit CoA activity and interfere with the synthesis and utilization of amino acids. LT also provides streptomycetes with additional NAD, a substance of great importance to their DNA synthesis and metabolic activity. With increased activity, streptomycin, chloramphenicol, adriamycin or any one of the many secondary metabolites (antibiotics) produced by Streptomyces could be endogenously generated in greater quantities. The clinical result would be increased host toxicity. A contaminant that has been isolated from case associated lots of LT may have simply provided additional tryptophan for an ASI. It is also possible that a nucleotide or similar substance in the case associated LT products caused increased activation of tryptophan-2,3-dioxygenase, the rate-limiting enzyme required for the production of NAD and/or actinomycin. Potential reasons for ASI, atypical forms of actinomycete-streptomycete micro-organisms, and the possibility of involvement in other diseases are discussed.
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Hensel M, Deckers-Hebestreit G, Altendorf K. Purification and characterization of the F1 portion of the ATP synthase (F1Fo) of Streptomyces lividans. EUROPEAN JOURNAL OF BIOCHEMISTRY 1991; 202:1313-9. [PMID: 1837270 DOI: 10.1111/j.1432-1033.1991.tb16505.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The F1 complex of the ATP synthase of Streptomyces lividans was isolated and purified. The procedure involved the solubilization of F1 from membranes with buffer of low ionic strength in the presence of EDTA, ion-exchange chromatography and gel filtration. The purified F1 complex from S. lividans (SLF1) consists of five subunits alpha, beta, gamma, delta and epsilon with molecular masses of 58,000, 50,000, 36,000, 28,000 and 13,000, respectively and exhibits immunological cross-reactivity with the F1 portion purified from Escherichia coli (ECF1). The enzymatic properties of SLF1 were determined by the use of microtiter-plate-based assay and compared with data obtained for ECF1. ATPase activity of SLF1 (specific activity: 20-30 U/mg) was only observed in the presence of high concentrations of Ca2+ (10mM). Stimulation of the ATPase activity by Mg2+ was not detectable; quite to the contrary, Mg2+ inhibited the Ca(2+)-stimulated activity of SLF1. SLF1 was re-bound to F1-stripped membranes of S. lividans, but not to F1-stripped membrane vesicles of E. coli. In contrast, ECF1 could be cross-reconstituted with F1-stripped membranes of S. lividans; however, a structural but not a functional reconstitution of the hybrid F1Fo complex was observed.
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Affiliation(s)
- M Hensel
- Arbeitsgruppe Mikrobiologie, Fachbereich Biologie/Chemie, Universität Osnabrück, Federal Republic of Germany
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18
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Elías M, Murillo FJ. Induction of germination in Myxococcus xanthus fruiting body spores. Microbiology (Reading) 1991. [DOI: 10.1099/00221287-137-2-381] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Summary
Myxococcus xanthus, when starved on a solid surface, undergoes a multicellular cycle of development that consists of fruiting and sporulation. Myxospore germination has been followed in CTT, a complex medium composed mainly of peptides, by monitoring the sequential disappearance of some characteristic spore properties. Loss of heat resistance, shortly after incubation was initiated, was followed by loss of resistance to SDS and finally, refractility and ovoid shape. Germination of a population of myxospores did not occur synchronously. However, in the presence of calcium, germination was activated, being more rapid and synchronous. Other spore activation treatments tested did not have the same stimulatory effect. We searched for specific nutrients or chemicals capable of inducing germination. Amino acids, unlike other potential carbon and energy sources for M. xanthus, or several sugars tested, were most effective in triggering germination. Continuous incubation in CTT and Casamino acids germinant solutions was not required for induction and completion of germination of a large proportion of spores in a population.
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Affiliation(s)
- Montserrat Elías
- Departamento de Genética y Microbiología, Facultad de Biología, Universidad de Murcia, 30071 Murcia, Spain
| | - Francisco J. Murillo
- Departamento de Genética y Microbiología, Facultad de Biología, Universidad de Murcia, 30071 Murcia, Spain
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Abbas AS, Edwards C. Effects of Metals on
Streptomyces coelicolor
Growth and Actinorhodin Production. Appl Environ Microbiol 1990; 56:675-80. [PMID: 16348141 PMCID: PMC183404 DOI: 10.1128/aem.56.3.675-680.1990] [Citation(s) in RCA: 48] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Actinorhodin production by
Streptomyces coelicolor
was used as a model system to study the effects of metals on growth and polyketide synthesis in a streptomycete. Numerous metals were tested in cultures grown in liquid media. Mercury and cadmium were highly toxic, and copper, nickel, and lead were less so, but all tended to inhibit both growth and antibiotic synthesis to a similar extent. Unexpectedly, manganese, cobalt, zinc, and, to a lesser extent, chromium caused complex effects that in general resulted in some enhancement of growth yield but a reduction in antibiotic titers. These complex effects meant that cobalt, manganese, and zinc had lower 50% inhibitory concentrations for antibiotic yields compared with those for biomass. The physiologically active divalent cations calcium and magnesium were also tested. Calcium at high concentrations was particularly effective in reducing antibiotic titers and enhancing growth yields. By adding calcium at different phases of growth, it could be demonstrated that it was most effective in reducing the antibiotic yield when added during the early growth phase. Addition during the antibiotic-producing phase resulted in little reduction of final actinorhodin titers.
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Affiliation(s)
- A S Abbas
- Department of Genetics and Microbiology, Life Sciences Building, The University of Liverpool, Crown Street, Liverpool L69 3BX, United Kingdom
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Horinouchi S, Beppu T. Autoregulatory factors of secondary metabolism and morphogenesis in actinomycetes. Crit Rev Biotechnol 1990; 10:191-204. [PMID: 2268871 DOI: 10.3109/07388559009038207] [Citation(s) in RCA: 53] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The Gram-positive bacterial genus Streptomyces possesses interesting biological aspects, such as the ability to produce a wide variety of secondary metabolites and a mycelial form of growth that culminates in sporulation. A close relationship of secondary metabolism and cell differentiation has been well recognized; secondary metabolism might be a physiological expression of cell differentiation. A variety of diffusible low-molecular-weight chemical substances have been found to function in general as regulatory factors, like "hormones" in eukaryotes, for secondary metabolism and cell differentiation. Among these factors, A-factor has been most extensively studied. This review summarizes recent research on the chemical structures, functions, biosyntheses, and mode of action of these regulatory factors.
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21
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Kamel Z, Khalil MS, Shalaby AM. Calcium and the biological activities of twoStreptomyces species isolated from the rhizosphere of soybean plants. J Basic Microbiol 1989. [DOI: 10.1002/jobm.3620290109] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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22
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The calcium requirement for functional vesicle development and nitrogen fixation by Frankia strains EAN1pec and CpI1. Arch Microbiol 1987. [DOI: 10.1007/bf00423131] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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23
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Swan DG, Hale RS, Dhillon N, Leadlay PF. A bacterial calcium-binding protein homologous to calmodulin. Nature 1987; 329:84-5. [PMID: 3627246 DOI: 10.1038/329084a0] [Citation(s) in RCA: 83] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Many of the effects of calcium ions in eukaryotic cells are mediated by calcium-binding regulatory proteins such as calmodulin, in which each calcium-binding site has a distinctive helix-loop-helix conformation termed the EF hand. Protein S from the spore coat of the Gram-negative bacterium Myxococcus xanthus has been shown to resemble calmodulin in its internally-duplicated structure and ability to bind calcium. However, it has a beta-sheet secondary structure rather than the helix-loop-helix arrangement of the eukaryotic proteins. We have determined the complete amino-acid sequence of a calcium-binding protein from the Gram-positive bacterium "Streptomyces erythraeus" by cloning and sequencing the corresponding gene. It contains four EF-hand motifs bearing remarkable sequence similarity to the calcium-binding sites in calmodulin. This implies that the EF-hand super-family may have evolved from ancient proteins present in prokaryotes.
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Abstract
A simple procedure for the isolation of membranes from Streptomyces spores is described which produces about 12 mg of membrane protein per g of dry weight. The membrane fractions were contaminated by low levels of DNA, RNA, and hexosamines. The functional integrity of the membrane is conserved through the isolation procedure, as evaluated by the presence of several activities of the membrane-bound electron transport chain. This isolation procedure allowed the determination of the biosynthesis of proteins and phospholipids of the membrane. Both biosynthetic processes started in the first 5 min of germination and increased progressively during spore germination. A stable mRNA fraction of the dormant spore encoded 44% of the membrane proteins synthesized early in germination, but most of the phospholipid biosynthesis was not dependent on this fraction.
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25
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Salas JA, Quiros LM, Hardisson C. Pathways of glucose catabolism during germination ofStreptomycesspores. FEMS Microbiol Lett 1984. [DOI: 10.1111/j.1574-6968.1984.tb00732.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
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Salas JA, Guijarro JA, Hardisson C. High calcium content in Streptomyces spores and its release as an early event during spore germination. J Bacteriol 1983; 155:1316-23. [PMID: 6411686 PMCID: PMC217830 DOI: 10.1128/jb.155.3.1316-1323.1983] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Abstract
The metal ion content of spores of five Streptomyces species was studied. A general feature of this study was the finding of a very high calcium content (1.1 to 2.1% of the dry weight). Accumulation of calcium occurred preferentially during the sporulation process. Spore calcium was located in the integument fraction, and more than 95% of the calcium was removed from intact spores by ethylene glycol-bis(beta-aminoethyl ether)-N,N-tetraacetic acid. Several divalent cations (Mg2+, Mn2+, Zn2+, and Fe2+) which induced darkening of spores and loss of heat resistance also caused the release of calcium from spores. In addition, darkening of spores was blocked by metabolic inhibitors, whereas calcium excretion was not affected. Two different categories of events in the initiation of germination may be differentiated; first, calcium release from spores which is not energy dependent and is a consequence of triggering of germination by some divalent cations, and second, some other events including loss of heat resistance, loss of spore refractility, and a decrease in absorbance, with at least one energy-dependent step.
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Gräfe U. [Secondary metabolites as endogenous effectors of microbial cytodifferentiation]. ZEITSCHRIFT FUR ALLGEMEINE MIKROBIOLOGIE 1983; 23:319-43. [PMID: 6624144 DOI: 10.1002/jobm.3630230507] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
The present survey covers the regulatory role of microbial secondary metabolites and related compounds as endogenous signals of cell differentiation of the producing organisms. Several antibiotics have been shown to exert autoregulatory effects on differentiation-associated functions. The mechanisms of self-protection of the producing cells against the autotoxicity of secondary metabolites are discussed in terms of an integral part of the modulation of signal strength. As a further topic, the review deals with the hormone-like interference of particular metabolites with differentiating cells. Conclusive discussion concerns the potential use of microbial signal molecules either as tools for directed manipulations of product syntheses or as pharmaceutics.
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