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González-Nava JB, Manzanares-Leal GL, Zapi-Colín LÁ, Dávila-Ramos S, Sandoval-Trujillo H, Ramírez-Durán N. Antibacterial activity of Nocardia spp. and Streptomyces sp. on multidrug-resistant pathogens causing neonatal sepsis. Rev Inst Med Trop Sao Paulo 2024; 66:e42. [PMID: 39082481 PMCID: PMC11295289 DOI: 10.1590/s1678-9946202466042] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2024] [Accepted: 05/20/2024] [Indexed: 08/04/2024] Open
Abstract
Neonatal sepsis leads to severe morbidity and occasionally death among neonates within the first week following birth, particularly in low- and middle-income countries. Empirical therapy includes antibiotics recommended by WHO. However, these have been ineffective against antimicrobial multidrug-resistant bacterial strains such as Klebsiella spp, Escherichia coli, and Staphylococcus aureus species. To counter this problem, new molecules and alternative sources of compounds with antibacterial activity are sought as options. Actinobacteria, particularly pathogenic strains, have revealed a biotechnological potential still underexplored. This study aimed to determine the presence of biosynthetic gene clusters and the antimicrobial activity of actinobacterial strains isolated from clinical cases against multidrug-resistant bacteria implicated in neonatal sepsis. In total, 15 strains isolated from clinical cases of actinomycetoma were used. PCR screening for the PKS-I, PKS-II, NRPS-I, and NRPS-II biosynthetic systems determined their secondary metabolite-producing potential. The strains were subsequently assayed for antimicrobial activity by the perpendicular cross streak method against Escherichia fergusonii Sec 23, Klebsiella pneumoniae subsp. pneumoniae H1064, Klebsiella variicola H776, Klebsiella oxytoca H793, and Klebsiella pneumoniae subsp. ozaenae H7595, previously classified as multidrug-resistant. Finally, the strains were identified by 16S rRNA gene sequence analysis. It was found that 100% of the actinobacteria had biosynthetic systems. The most frequent biosynthetic system was NRPS-I (100%), and the most frequent combination was NRPS-I and PKS-II (27%). All 15 strains showed antimicrobial activity. The strain with the highest antimicrobial activity was Streptomyces albus 94.1572, as it inhibited the growth of the five multidrug-resistant bacteria evaluated.
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Affiliation(s)
- Janette Berenice González-Nava
- Universidad Autónoma del Estado de México, Facultad de Medicina, Laboratorio de Investigación en Microbiología Médica y Ambiental, Toluca, Mexico
| | - Gauddy Lizeth Manzanares-Leal
- Universidad Autónoma del Estado de México, Facultad de Medicina, Laboratorio de Investigación en Microbiología Médica y Ambiental, Toluca, Mexico
| | - Luis Ángel Zapi-Colín
- Universidad Autónoma del Estado de México, Facultad de Medicina, Laboratorio de Neuroquímica, Toluca, Mexico
| | - Sonia Dávila-Ramos
- Universidad Autónoma del Estado de Morelos, Instituto de Investigaciones en Ciencias Básicas y Aplicadas, Centro de Investigación en Dinámica Celular, Morelos, Mexico
| | - Horacio Sandoval-Trujillo
- Universidad Autónoma Metropolitana, Departamento de Sistemas Biológicos, Laboratorio de Producción de Biológicos, Ciudad de México, Mexico
| | - Ninfa Ramírez-Durán
- Universidad Autónoma del Estado de México, Facultad de Medicina, Laboratorio de Investigación en Microbiología Médica y Ambiental, Toluca, Mexico
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2
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Sekurova ON, Zehl M, Predl M, Hunyadi P, Rattei T, Zotchev SB. Deletions of conserved extracytoplasmic function sigma factors-encoding genes in Streptomyces have a major impact on secondary metabolism. Microb Cell Fact 2024; 23:201. [PMID: 39026318 PMCID: PMC11256431 DOI: 10.1186/s12934-024-02479-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2024] [Accepted: 07/08/2024] [Indexed: 07/20/2024] Open
Abstract
BACKGROUND Ethanol shock significantly affects expression of over 1200 genes in Streptomyces venezuelae NRRL B-65,442, including those involved in secondary metabolite biosynthesis and a cryptic gene pepX, which encodes a 19-amino acid peptide with an unknown function. RESULTS To establish a possible correlation between the PepX peptide and secondary metabolism in S. venezuelae, its gene was deleted, followed by analyses of the transcriptome and secondary metabolome of the mutant. Although the secondary metabolome of the pepX mutant was not strongly affected, pepX deletion, similar to ethanol shock, mostly resulted in downregulated expression of secondary metabolite biosynthesis gene clusters (BGCs). At the same time, there was a reverse correlation between the expression of certain extracytoplasmic function sigma factors (ECFs) and several BGCs. Individual deletions of three selected ECF-coding genes conserved in Streptomyces that were upregulated upon both pepX deletion and ethanol shock, had a profound positive effect on the expression of BGCs, which also correlated with the overproduction of specific secondary metabolites. Deletion of one such ECF-coding gene in a marine sponge-derived Streptomyces sp. also significantly altered the secondary metabolite profile, suggesting an important role of this ECF in the regulation of secondary metabolism. CONCLUSIONS These findings pave the way for the activation or upregulation of BGCs in Streptomyces bacteria harboring genes for ECFs homologous to those identified in this study, hereby assisting in the discovery of novel bioactive secondary metabolites.
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Affiliation(s)
- Olga N Sekurova
- Department of Pharmaceutical Sciences, Division of Pharmacognosy, University of Vienna, Vienna, 1090, Austria
| | - Martin Zehl
- Department of Analytical Chemistry, Faculty of Chemistry, University of Vienna, Vienna, 1090, Austria
| | - Michael Predl
- Centre for Microbiology and Environmental Systems Science, University of Vienna, Vienna, 1030, Austria
- Doctoral School in Microbiology and Environmental Science, University of Vienna, Vienna, 1030, Austria
| | - Peter Hunyadi
- Centre for Microbiology and Environmental Systems Science, University of Vienna, Vienna, 1030, Austria
| | - Thomas Rattei
- Centre for Microbiology and Environmental Systems Science, University of Vienna, Vienna, 1030, Austria
- Doctoral School in Microbiology and Environmental Science, University of Vienna, Vienna, 1030, Austria
| | - Sergey B Zotchev
- Department of Pharmaceutical Sciences, Division of Pharmacognosy, University of Vienna, Vienna, 1090, Austria.
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Zhu Y, Lu T, Zhang H, Liu M, Pang X. SVEN_5003 is a Major Developmental Regulator in Streptomyces venezuelae. Curr Microbiol 2024; 81:166. [PMID: 38724665 DOI: 10.1007/s00284-024-03688-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2024] [Accepted: 04/03/2024] [Indexed: 05/15/2024]
Abstract
Many regulatory genes that affect cellular development in Streptomyces, such as the canonical bld genes, have already been identified. However, in this study, we identified sven_5003 in Streptomyces venezuelae as a major new developmental regulatory gene, the deletion of which leads to a bald phenotype, typical of bld mutants, under multiple growth conditions. Our data indicated that disruption of sven_5003 also has a differential impact on the production of the two antibiotics jadomycin and chloramphenicol. Enhanced production of jadomycin but reduced production of chloramphenicol were detected in our sven_5003 mutant strain (S. venezuelae D5003). RNA-Seq analysis indicated that SVEN_5003 impacts expression of hundreds of genes, including genes involved in development, primary and secondary metabolism, and genes of unknown function, a finding confirmed by real-time PCR analysis. Transcriptional analysis indicated that sven_5003 is an auto-regulatory gene, repressing its own expression. Despite the evidence indicating that SVEN_5003 is a regulatory factor, a putative DNA-binding domain was not predicted from its primary amino acid sequence, implying an unknown regulatory mechanism by SVEN_5003. Our findings revealed that SVEN_5003 is a pleiotropic regulator with a critical role in morphological development in S. venezuelae.
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Affiliation(s)
- Yanping Zhu
- The State Key Laboratory of Microbial Technology, Shandong University, Qingdao, 266237, China
| | - Ting Lu
- The State Key Laboratory of Microbial Technology, Shandong University, Qingdao, 266237, China
| | - Hanlei Zhang
- The State Key Laboratory of Microbial Technology, Shandong University, Qingdao, 266237, China
| | - Meng Liu
- School of Municipal and Environmental Engineering, Shandong Jianzhu University, Jinan, 250101, China
| | - Xiuhua Pang
- The State Key Laboratory of Microbial Technology, Shandong University, Qingdao, 266237, China.
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4
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Tian J, Li Y, Zhang C, Su J, Lu W. Characterization of a pleiotropic regulator MtrA in Streptomyces avermitilis controlling avermectin production and morphological differentiation. Microb Cell Fact 2024; 23:103. [PMID: 38584273 PMCID: PMC11000389 DOI: 10.1186/s12934-024-02331-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2024] [Accepted: 02/11/2024] [Indexed: 04/09/2024] Open
Abstract
BACKGROUND The macrolide antibiotic avermectin, a natural product derived from Streptomyces avermitilis, finds extensive applications in agriculture, animal husbandry and medicine. The mtrA (sav_5063) gene functions as a transcriptional regulator belonging to the OmpR family. As a pleiotropic regulator, mtrA not only influences the growth, development, and morphological differentiation of strains but also modulates genes associated with primary metabolism. However, the regulatory role of MtrA in avermectin biosynthesis remains to be elucidated. RESULTS In this study, we demonstrated that MtrA, a novel OmpR-family transcriptional regulator in S. avermitilis, exerts global regulator effects by negatively regulating avermectin biosynthesis and cell growth while positively controlling morphological differentiation. The deletion of the mtrA gene resulted in an increase in avermectin production, accompanied by a reduction in biomass and a delay in the formation of aerial hyphae and spores. The Electrophoretic Mobility Shift Assay (EMSA) revealed that MtrA exhibited binding affinity towards the upstream region of aveR, the intergenic region between aveA1 and aveA2 genes, as well as the upstream region of aveBVIII in vitro. These findings suggest that MtrA exerts a negative regulatory effect on avermectin biosynthesis by modulating the expression of avermectin biosynthesis cluster genes. Transcriptome sequencing and fluorescence quantitative PCR analysis showed that mtrA deletion increased the transcript levels of the cluster genes aveR, aveA1, aveA2, aveC, aveE, aveA4 and orf-1, which explains the observed increase in avermectin production in the knockout strain. Furthermore, our findings demonstrate that MtrA positively regulates the cell division and differentiation genes bldM and ssgC, while exerting a negative regulatory effect on bldD, thereby modulating the primary metabolic processes associated with cell division, differentiation and growth in S. avermitilis, consequently impacting avermectin biosynthesis. CONCLUSIONS In this study, we investigated the negative regulatory effect of the global regulator MtrA on avermectin biosynthesis and its effects on morphological differentiation and cell growth, and elucidated its transcriptional regulatory mechanism. Our findings indicate that MtrA plays crucial roles not only in the biosynthesis of avermectin but also in coordinating intricate physiological processes in S. avermitilis. These findings provide insights into the synthesis of avermectin and shed light on the primary and secondary metabolism of S. avermitilis mediated by OmpR-family regulators.
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Affiliation(s)
- Jinpin Tian
- School of Chemical Engineering and Technology, Tianjin University, Tianjin, People's Republic of China
| | - Yue Li
- School of Chemical Engineering and Technology, Tianjin University, Tianjin, People's Republic of China
| | - Chuanbo Zhang
- School of Chemical Engineering and Technology, Tianjin University, Tianjin, People's Republic of China
- Frontiers Science Center for Synthetic Biology, Tianjin University, Tianjin, People's Republic of China
- Key Laboratory of System Bioengineering (Tianjin University), Ministry of Education, Tianjin, People's Republic of China
| | - Jianyu Su
- Key Laboratory of the Ministry of Education for Conservation and Utilization of Special Biological Resources in the Western, Yinchuan, 750021, China.
- College of Life Science, Ningxia University, Yinchuan, 750021, Ningxia, China.
| | - Wenyu Lu
- School of Chemical Engineering and Technology, Tianjin University, Tianjin, People's Republic of China.
- Frontiers Science Center for Synthetic Biology, Tianjin University, Tianjin, People's Republic of China.
- Key Laboratory of System Bioengineering (Tianjin University), Ministry of Education, Tianjin, People's Republic of China.
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Xie H, Ruan JY, Bu QT, Li YP, Su YT, Zhao QW, Du YL, Li YQ. Transcriptional regulation of the fidaxomicin gene cluster and cellular development in Actinoplanes deccanensis YP-1 by the pleiotropic regulator MtrA. Microbiol Spectr 2023; 11:e0270223. [PMID: 37966201 PMCID: PMC10714768 DOI: 10.1128/spectrum.02702-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2023] [Accepted: 10/06/2023] [Indexed: 11/16/2023] Open
Abstract
IMPORTANCE Cascade regulation networks are almost present in various kinds of microorganisms, but locating and systematically elucidating specific pleiotropic regulators related to a certain gene cluster can be a tricky problem. Here, based on the promoter of the fidaxomicin pathway-specific regulator FadR1, we utilized a "DNA to Proteins" affinity purification method and captured a global regulator MtrA, which positively regulates fidaxomicin biosynthesis. In the mtrA overexpressed strain, the production of fidaxomicin was improved by 37% compared to the native strain. Then, we combined the "Protein to DNAs" affinity purification method (DAP-seq) with the results of RNA-seq and systematically elucidated the primary and secondary metabolic processes in which MtrA directly or indirectly participates. Thus, our work brought up a new way to improve fidaxomicin production from the perspective of global regulation and analyzed the regulatory mechanism of MtrA. Meanwhile, we provided a novel methodology for the research of cascade regulation networks and vital secondary metabolites.
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Affiliation(s)
- Huang Xie
- First Affiliated Hospital and Institute of Pharmaceutical Biotechnology, Zhejiang University School of Medicine, Hangzhou, China
- Zhejiang Provincial Key Laboratory for Microbial Biochemistry and Metabolic Engineering, Institute of Pharmaceutical Biotechnology, Hangzhou, China
| | - Jing-Yi Ruan
- First Affiliated Hospital and Institute of Pharmaceutical Biotechnology, Zhejiang University School of Medicine, Hangzhou, China
- Zhejiang Provincial Key Laboratory for Microbial Biochemistry and Metabolic Engineering, Institute of Pharmaceutical Biotechnology, Hangzhou, China
| | - Qing-Ting Bu
- First Affiliated Hospital and Institute of Pharmaceutical Biotechnology, Zhejiang University School of Medicine, Hangzhou, China
- Zhejiang Provincial Key Laboratory for Microbial Biochemistry and Metabolic Engineering, Institute of Pharmaceutical Biotechnology, Hangzhou, China
| | - Yue-Ping Li
- First Affiliated Hospital and Institute of Pharmaceutical Biotechnology, Zhejiang University School of Medicine, Hangzhou, China
- Zhejiang Provincial Key Laboratory for Microbial Biochemistry and Metabolic Engineering, Institute of Pharmaceutical Biotechnology, Hangzhou, China
| | - Yi-Ting Su
- First Affiliated Hospital and Institute of Pharmaceutical Biotechnology, Zhejiang University School of Medicine, Hangzhou, China
- Zhejiang Provincial Key Laboratory for Microbial Biochemistry and Metabolic Engineering, Institute of Pharmaceutical Biotechnology, Hangzhou, China
| | - Qing-Wei Zhao
- First Affiliated Hospital and Institute of Pharmaceutical Biotechnology, Zhejiang University School of Medicine, Hangzhou, China
| | - Yi-Ling Du
- First Affiliated Hospital and Institute of Pharmaceutical Biotechnology, Zhejiang University School of Medicine, Hangzhou, China
- Zhejiang Provincial Key Laboratory for Microbial Biochemistry and Metabolic Engineering, Institute of Pharmaceutical Biotechnology, Hangzhou, China
| | - Yong-Quan Li
- First Affiliated Hospital and Institute of Pharmaceutical Biotechnology, Zhejiang University School of Medicine, Hangzhou, China
- Zhejiang Provincial Key Laboratory for Microbial Biochemistry and Metabolic Engineering, Institute of Pharmaceutical Biotechnology, Hangzhou, China
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6
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Liu X, Ahmad S, Ma J, Wang D, Tang J. Comparative study on the toxic effects of secondary nanoplastics from biodegradable and conventional plastics on Streptomyces coelicolor M145. JOURNAL OF HAZARDOUS MATERIALS 2023; 460:132343. [PMID: 37639795 DOI: 10.1016/j.jhazmat.2023.132343] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/02/2023] [Revised: 08/16/2023] [Accepted: 08/16/2023] [Indexed: 08/31/2023]
Abstract
Because of the excellent properties, plastics have been widely used in the past decades and caused serious environmental issues. As an excellent substitute for conventional plastics, the biodegradable plastics have attracted increasing attention. However, biodegradable plastics may produce more micro/nanoplastics in the short time compared with conventional plastics, and cause more serious ecological risks. In this study, the short-term toxicity of nanoplastics released from biodegradable and conventional plastics on Streptomyces coelicolor M145 was investigated. After 30 days of degradation, the biodegradable microplastics, polylactic acid (PLA) and polyhydroxyalkanoates (PHA) released more secondary nanoplastics than conventional microplastics, polystyrene (PS). After exposure, PLA and PHA nanoplastics showed significant toxicity to M145. The survival rate of M145 cells was 16.1% after treatment with PLA nanoplastics for 7 days (PLA-7). The toxicity of PHA was lower than that of PLA. This might have been due to the agglomeration of PHA nanoplastics in the solution. Compared with the controls, the PS secondary nanoplastics showed no significant toxicity to M145. After the treatment, the production of antibiotics, actinorhodin (ACT) and undecylprodigiosin (RED), significantly increased. The yields of ACT and RED reached their maximum values after treatment with PLA-7, which were 4.2-fold and 2.1-fold higher than those of the controls, respectively. The addition of biodegradable nanoplastics significantly increased the expression of these key pathway-specific regulatory genes, leading to increased antibiotic production. This study provides toxicological insights into the impacts of conventional and biodegradable microplastics on S. coelicolor.
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Affiliation(s)
- Xiaomei Liu
- College of Life Sciences, Qufu Normal University, Qufu, Shandong 273165, China; MOE Key Laboratory of Pollution Processes and Environmental Criteria/Tianjin Engineering Center of Environmental Diagnosis and Contamination Remediation, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China
| | - Shakeel Ahmad
- MOE Key Laboratory of Pollution Processes and Environmental Criteria/Tianjin Engineering Center of Environmental Diagnosis and Contamination Remediation, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China
| | - Jingkang Ma
- MOE Key Laboratory of Pollution Processes and Environmental Criteria/Tianjin Engineering Center of Environmental Diagnosis and Contamination Remediation, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China
| | - Dan Wang
- MOE Key Laboratory of Pollution Processes and Environmental Criteria/Tianjin Engineering Center of Environmental Diagnosis and Contamination Remediation, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China
| | - Jingchun Tang
- MOE Key Laboratory of Pollution Processes and Environmental Criteria/Tianjin Engineering Center of Environmental Diagnosis and Contamination Remediation, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China.
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7
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Sheng Q, Liu A, Yang P, Chen Z, Wang P, Sun H, Li C, McMinn A, Chen Y, Zhang Y, Su H, Chen X, Zhang Y. The FilZ Protein Contains a Single PilZ Domain and Facilitates the Swarming Motility of Pseudoalteromonas sp. SM9913. Microorganisms 2023; 11:1566. [PMID: 37375068 DOI: 10.3390/microorganisms11061566] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2023] [Revised: 06/03/2023] [Accepted: 06/06/2023] [Indexed: 06/29/2023] Open
Abstract
Swarming regulation is complicated in flagellated bacteria, especially those possessing dual flagellar systems. It remains unclear whether and how the movement of the constitutive polar flagellum is regulated during swarming motility of these bacteria. Here, we report the downregulation of polar flagellar motility by the c-di-GMP effector FilZ in the marine sedimentary bacterium Pseudoalteromonas sp. SM9913. Strain SM9913 possesses two flagellar systems, and filZ is located in the lateral flagellar gene cluster. The function of FilZ is negatively controlled by intracellular c-di-GMP. Swarming in strain SM9913 consists of three periods. Deletion and overexpression of filZ revealed that, during the period when strain SM9913 expands quickly, FilZ facilitates swarming. In vitro pull-down and bacterial two-hybrid assays suggested that, in the absence of c-di-GMP, FilZ interacts with the CheW homolog A2230, which may be involved in the chemotactic signal transduction pathway to the polar flagellar motor protein FliMp, to interfere with polar flagellar motility. When bound to c-di-GMP, FilZ loses its ability to interact with A2230. Bioinformatic investigation indicated that filZ-like genes are present in many bacteria with dual flagellar systems. Our findings demonstrate a novel mode of regulation of bacterial swarming motility.
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Affiliation(s)
- Qi Sheng
- State Key Laboratory of Microbial Technology, Shandong University, Qingdao 266237, China
| | - Ang Liu
- State Key Laboratory of Microbial Technology, Shandong University, Qingdao 266237, China
| | - Peiling Yang
- State Key Laboratory of Microbial Technology, Shandong University, Qingdao 266237, China
| | - Zhuowei Chen
- State Key Laboratory of Microbial Technology, Shandong University, Qingdao 266237, China
| | - Peng Wang
- Frontiers Science Center for Deep Ocean Multispheres and Earth System, College of Marine Life Sciences, Ocean University of China, Qingdao 266100, China
- Laboratory for Marine Biology and Biotechnology, Pilot National Laboratory for Marine Science and Technology, Qingdao 266237, China
| | - Haining Sun
- State Key Laboratory of Microbial Technology, Shandong University, Qingdao 266237, China
| | - Chunyang Li
- Frontiers Science Center for Deep Ocean Multispheres and Earth System, College of Marine Life Sciences, Ocean University of China, Qingdao 266100, China
- Laboratory for Marine Biology and Biotechnology, Pilot National Laboratory for Marine Science and Technology, Qingdao 266237, China
| | - Andrew McMinn
- Frontiers Science Center for Deep Ocean Multispheres and Earth System, College of Marine Life Sciences, Ocean University of China, Qingdao 266100, China
- Institute for Marine and Antarctic Studies, University of Tasmania, Hobart, TAS 7005, Australia
| | - Yin Chen
- Frontiers Science Center for Deep Ocean Multispheres and Earth System, College of Marine Life Sciences, Ocean University of China, Qingdao 266100, China
- School of Life Sciences, University of Warwick, Coventry CV4 7AL, UK
| | - Yuzhong Zhang
- State Key Laboratory of Microbial Technology, Shandong University, Qingdao 266237, China
- Frontiers Science Center for Deep Ocean Multispheres and Earth System, College of Marine Life Sciences, Ocean University of China, Qingdao 266100, China
- Laboratory for Marine Biology and Biotechnology, Pilot National Laboratory for Marine Science and Technology, Qingdao 266237, China
| | - Hainan Su
- State Key Laboratory of Microbial Technology, Shandong University, Qingdao 266237, China
| | - Xiulan Chen
- State Key Laboratory of Microbial Technology, Shandong University, Qingdao 266237, China
- Laboratory for Marine Biology and Biotechnology, Pilot National Laboratory for Marine Science and Technology, Qingdao 266237, China
| | - Yuqiang Zhang
- State Key Laboratory of Microbial Technology, Shandong University, Qingdao 266237, China
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8
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Jin S, Hui M, Lu Y, Zhao Y. An overview on the two-component systems of Streptomyces coelicolor. World J Microbiol Biotechnol 2023; 39:78. [PMID: 36645528 DOI: 10.1007/s11274-023-03522-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2022] [Accepted: 01/10/2023] [Indexed: 01/17/2023]
Abstract
The two-component system (TCS) found in various organisms is a regulatory system, which is involved in the response by the organism to stimuli, thereby regulating the internal behavior of the cell. It is commonly found in prokaryotes and is an important signaling system in bacteria. TCSs are involved in the regulation of physiological and morphological differentiation of the industrially important microbes from the genus Streptomyces, which produce a vast array of bioactive secondary metabolites (SMs). Genetic engineering of TCSs can substantially increase the yield of target SMs, which is valuable for industrial-scale production. Research on TCS has mainly been completed in the model strain Streptomyces coelicolor. In this review, we summarize the recent advances in the functional identification and elucidation of the regulatory mechanisms of various TCSs in S. coelicolor, with a focus on their roles in the biosynthesis of important SMs.
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Affiliation(s)
- Shangping Jin
- College of Bioengineering, Henan University of Technology, 100 Lianhua Street, 450001, Zhengzhou, China
| | - Ming Hui
- College of Bioengineering, Henan University of Technology, 100 Lianhua Street, 450001, Zhengzhou, China
| | - Yinhua Lu
- College of Life Sciences, Shanghai Normal University, 100 Guilin Road, 200234, Shanghai, China.
| | - Yawei Zhao
- College of Bioengineering, Henan University of Technology, 100 Lianhua Street, 450001, Zhengzhou, China.
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9
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Sánchez de la Nieta R, Santamaría RI, Díaz M. Two-Component Systems of Streptomyces coelicolor: An Intricate Network to Be Unraveled. Int J Mol Sci 2022; 23:ijms232315085. [PMID: 36499414 PMCID: PMC9739842 DOI: 10.3390/ijms232315085] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2022] [Revised: 11/24/2022] [Accepted: 11/28/2022] [Indexed: 12/04/2022] Open
Abstract
Bacteria of the Streptomyces genus constitute an authentic biotech gold mine thanks to their ability to produce a myriad of compounds and enzymes of great interest at various clinical, agricultural, and industrial levels. Understanding the physiology of these organisms and revealing their regulatory mechanisms is essential for their manipulation and application. Two-component systems (TCSs) constitute the predominant signal transduction mechanism in prokaryotes, and can detect a multitude of external and internal stimuli and trigger the appropriate cellular responses for adapting to diverse environmental conditions. These global regulatory systems usually coordinate various biological processes for the maintenance of homeostasis and proper cell function. Here, we review the multiple TCSs described and characterized in Streptomyces coelicolor, one of the most studied and important model species within this bacterial group. TCSs are involved in all cellular processes; hence, unravelling the complex regulatory network they form is essential for their potential biotechnological application.
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10
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Ye L, Zhang Y, Li S, He H, Ai G, Wang X, Xiang W. Transcriptome-guided identification of a four-component system, SbrH1-R, that modulates milbemycin biosynthesis by influencing gene cluster expression, precursor supply, and antibiotic efflux. Synth Syst Biotechnol 2022; 7:705-717. [PMID: 35261928 PMCID: PMC8866680 DOI: 10.1016/j.synbio.2022.02.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2021] [Revised: 01/10/2022] [Accepted: 02/07/2022] [Indexed: 11/24/2022] Open
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11
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Sulfane Sulfur Posttranslationally Modifies the Global Regulator AdpA to Influence Actinorhodin Production and Morphological Differentiation of Streptomyces coelicolor. mBio 2022; 13:e0386221. [PMID: 35467418 PMCID: PMC9239190 DOI: 10.1128/mbio.03862-21] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The transcription factor AdpA is a key regulator controlling both secondary metabolism and morphological differentiation in Streptomyces. Due to its critical functions, its expression undergoes multilevel regulations at transcriptional, posttranscriptional, and translational levels, yet no posttranslational regulation has been reported. Sulfane sulfur, such as hydro polysulfide (HSnH, n ≥ 2) and organic polysulfide (RSnH, n ≥ 2), is common inside microorganisms, but its physiological functions are largely unclear. Here, we discovered that sulfane sulfur posttranslationally modifies AdpA in Streptomyces coelicolor via specifically reacting with Cys62 of AdpA to form a persulfide (Cys62-SSH). This modification decreases the affinity of AdpA to its self-promoter PadpA, allowing increased expression of adpA, further promoting the expression of its target genes actII-4 and wblA. ActII-4 activates actinorhodin biosynthesis, and WblA regulates morphological development. Bioinformatics analyses indicated that AdpA-Cys62 is highly conserved in Streptomyces, suggesting the prevalence of such modification in this genus. Thus, our study unveils a new type of regulation on the AdpA activity and sheds a light on how sulfane sulfur stimulates the production of antibiotics in Streptomyces.
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Zhu Y, Wang X, Zhang J, Ni X, Zhang X, Tao M, Pang X. The regulatory gene wblA is a target of the orphan response regulator OrrA in Streptomyces coelicolor. Environ Microbiol 2022; 24:3081-3096. [PMID: 35384219 DOI: 10.1111/1462-2920.15992] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2022] [Revised: 03/28/2022] [Accepted: 03/30/2022] [Indexed: 11/30/2022]
Abstract
Our previous study using transposon mutagenesis indicated that disruption of the putative response regulator gene orrA impacted antibiotic production in Streptomyces coelicolor. In this study, the role of OrrA was further characterized by comparing the phenotypes and transcriptomic profiles of the wild-type S. coelicolor strain M145 and ΔorrA, a strain with an inactivated orrA gene. Chromatin immunoprecipitation using a strain expressing OrrA fused with FLAG showed that OrrA binds the promoter of wblA, whose expression was downregulated in ΔorrA. The interaction of OrrA with the wblA promoter was further validated by a pull-down assay. Similar to ΔorrA, the deletion mutant of wblA (ΔwblA) was defective in development, and developmental genes were expressed at similar levels in ΔorrA and ΔwblA. Although both OrrA and WblA downregulated actinorhodin and undecylprodigiosin, their roles in regulation of the calcium-dependent antibiotic and yellow-pigmented type I polyketide differed. sco1375, a gene of unknown function, was identified as another OrrA target, and overexpression of either sco1375 or wblA in ΔorrA partially restored the wild-type phenotype, indicating that these genes mediate some of the effects of OrrA. This study revealed targets of OrrA and provided more insights into the role of the orphan response regulator OrrA in Streptomyces. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Yanping Zhu
- The State Key Laboratory of Microbial Technology, Shandong University, Qingdao, 266237, China.,Colleage of Life Sciences, Qingdao University, Qingdao, 266071, China
| | - Xinyuan Wang
- The State Key Laboratory of Microbial Technology, Shandong University, Qingdao, 266237, China
| | - Jing Zhang
- The State Key Laboratory of Microbial Technology, Shandong University, Qingdao, 266237, China
| | - Xue Ni
- The State Key Laboratory of Microbial Technology, Shandong University, Qingdao, 266237, China
| | - Xia Zhang
- Qingdao Vland Biotech Group Inc, Qingdao, 266000, China
| | - Meifeng Tao
- The State Key Laboratory of Microbial Metabolism, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Xiuhua Pang
- The State Key Laboratory of Microbial Technology, Shandong University, Qingdao, 266237, China
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Mutation of MtrA at the Predicted Phosphorylation Site Abrogates Its Role as a Global Regulator in Streptomyces venezuelae. Microbiol Spectr 2022; 10:e0213121. [PMID: 35293797 PMCID: PMC9045223 DOI: 10.1128/spectrum.02131-21] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The global regulator MtrA controls development and primary and secondary metabolism in Streptomyces species. However, residues critical for its function have not yet been characterized. In this study, we identified residue D53 as the potential phosphorylation site of MtrA from Streptomyces venezuelae, a model Streptomyces strain. MtrA variants with amino acid substitutions at the D53 site were generated, and the effects of these substitutions were evaluated in vitro and in vivo. We showed that, although substitutions at D53 did not alter MtrA's secondary structure, the MtrA D53 protein variants lost the ability to bind known MtrA recognition sequences (MtrA sites) in electrophoretic mobility shift assays. Complementation of the ΔmtrA strain with MtrA D53 protein variants did not affect overall strain growth. However, in comparison to the wild-type strain, chloramphenicol and jadomycin production were aberrant in the D53 variant strains, with levels similar to the levels in the ΔmtrA strain. Transcriptional analysis showed that the expression patterns of genes were also similar in the ΔmtrA strain and the D53 variant strains. Although the D53 protein variants and wild-type MtrA were produced at similar levels in S. venezuelae, chromatin immunoprecipitation-quantitative PCR results indicated that replacing the D53 residue rendered the altered proteins unable to bind MtrA sites in vivo, including MtrA sites that regulate genes involved in nitrogen metabolism and in chloramphenicol and jadomycin biosynthesis. In conclusion, our study demonstrates that the predicted phosphorylation site D53 is critical for the role of MtrA in regulation and suggests that MtrA functions in a phosphorylated form in the genus Streptomyces. IMPORTANCE Although phosphorylation has been shown to be essential for the activation of many response regulator proteins of two-component systems, the role of the phosphorylation site in the function of the global regulator MtrA in the genus Streptomyces has not been reported. In this study, we generated Streptomyces mutants that had amino acid substitutions at the predicted phosphorylation site of MtrA, and the effects of the substitutions were investigated by comparing the phenotypes of the resulting strains and their gene expression patterns with those of the wild-type strain and an MtrA deletion mutant. The ability of the altered proteins to bind known promoter targets in vitro was also evaluated. Our analyses showed that the predicted phosphorylation site D53 is critical for MtrA binding in vitro and for the normal functioning of MtrA in vivo. These studies further demonstrate the importance of MtrA as a global regulator in the genus Streptomyces.
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Zhu Y, Wang J, Su W, Lu T, Li A, Pang X. Effects of dual deletion of glnR and mtrA on expression of nitrogen metabolism genes in Streptomyces venezuelae. Microb Biotechnol 2022; 15:1795-1810. [PMID: 35148463 PMCID: PMC9151340 DOI: 10.1111/1751-7915.14016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2021] [Revised: 01/28/2022] [Accepted: 01/30/2022] [Indexed: 11/30/2022] Open
Abstract
GlnR activates nitrogen metabolism genes under nitrogen‐limited conditions, whereas MtrA represses these genes under nutrient‐rich conditions in Streptomyces. In this study, we compared the transcription patterns of nitrogen metabolism genes in a double deletion mutant (ΔmtrA‐glnR) lacking both mtrA and glnR and in mutants lacking either mtrA (ΔmtrA) or glnR (ΔglnR). The nitrogen metabolism genes were expressed similarly in ΔmtrA‐glnR and ΔglnR under both nitrogen‐limited and nutrient‐rich conditions, with patterns distinctly different from that of ΔmtrA, suggesting a decisive role for GlnR in the control of nitrogen metabolism genes and further suggesting that regulation of these genes by MtrA is GlnR‐dependent. MtrA and GlnR utilize the same binding sites upstream of nitrogen metabolism genes, and we showed stronger in vivo binding of MtrA to these sites under nutrient‐rich conditions and of GlnR under nitrogen‐limited conditions, consistent with the higher levels of MtrA or GlnR under those respective conditions. In addition, we showed that both mtrA and glnR are self‐regulated. Our study provides new insights into the regulation of nitrogen metabolism genes in Streptomyces.
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Affiliation(s)
- Yanping Zhu
- The State Key Laboratory of Microbial Technology, Shandong University, Qingdao, 266237, China
| | - Jiao Wang
- The State Key Laboratory of Microbial Technology, Shandong University, Qingdao, 266237, China
| | - Wenya Su
- The State Key Laboratory of Microbial Technology, Shandong University, Qingdao, 266237, China
| | - Ting Lu
- The State Key Laboratory of Microbial Technology, Shandong University, Qingdao, 266237, China
| | - Aiying Li
- The State Key Laboratory of Microbial Technology, Shandong University, Qingdao, 266237, China
| | - Xiuhua Pang
- The State Key Laboratory of Microbial Technology, Shandong University, Qingdao, 266237, China
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He H, Tang J, Chen J, Hu J, Zhu Z, Liu Y, Shuai L, Cao L, Liu Z, Xia Z, Ding X, Hu S, Zhang Y, Rang J, Xia L. Flaviolin-Like Gene Cluster Deletion Optimized the Butenyl-Spinosyn Biosynthesis Route in Saccharopolyspora pogona. ACS Synth Biol 2021; 10:2740-2752. [PMID: 34601869 DOI: 10.1021/acssynbio.1c00344] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Reduction and optimization of the microbial genome is an important strategy for constructing synthetic biological chassis cells and overcoming obstacles in natural product discovery and production. However, it is of great challenge to discover target genes that can be deleted and optimized due to the complicated genome of actinomycetes. Saccharopolyspora pogona can produce butenyl-spinosyn during aerobic fermentation, and its genome contains 32 different gene clusters. This suggests that there is a large amount of potential competitive metabolism in S. pogona, which affects the biosynthesis of butenyl-spinosyn. By analyzing the genome of S. pogona, six polyketide gene clusters were identified. From those, the complete deletion of clu13, a flaviolin-like gene cluster, generated a high butenyl-spinosyn-producing strain. Production of this strain was 4.06-fold higher than that of the wildtype strain. Transcriptome profiling revealed that butenyl-spinosyn biosynthesis was not primarily induced by the polyketide synthase RppA-like but was related to hypothetical protein Sp1764. However, the repression of sp1764 was not enough to explain the enormous enhancement of butenyl-spinosyn yields in S. pogona-Δclu13. After the comparative proteomic analysis of S. pogona-Δclu13 and S. pogona, two proteins, biotin carboxyl carrier protein (BccA) and response regulator (Reg), were investigated, whose overexpression led to great advantages of butenyl-spinosyn biosynthesis. In this way, we successfully discovered three key genes that obviously optimize the biosynthesis of butenyl-spinosyn. Gene cluster simplification performed in conjunction with multiomics analysis is of great practical significance for screening dominant chassis strains and optimizing secondary metabolism. This work provided an idea about screening key factors and efficient construction of production strains.
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Affiliation(s)
- Haocheng He
- Hunan Provincial Key Laboratory for Microbial Molecular Biology, State Key Laboratory of Developmental Biology of Freshwater Fish, College of Life Science, Hunan Normal University, Changsha 410083, China
| | - Jianli Tang
- Hunan Provincial Key Laboratory for Microbial Molecular Biology, State Key Laboratory of Developmental Biology of Freshwater Fish, College of Life Science, Hunan Normal University, Changsha 410083, China
| | - Jianming Chen
- Hunan Provincial Key Laboratory for Microbial Molecular Biology, State Key Laboratory of Developmental Biology of Freshwater Fish, College of Life Science, Hunan Normal University, Changsha 410083, China
| | - Jinjuan Hu
- Hunan Provincial Key Laboratory for Microbial Molecular Biology, State Key Laboratory of Developmental Biology of Freshwater Fish, College of Life Science, Hunan Normal University, Changsha 410083, China
| | - Zirong Zhu
- Hunan Provincial Key Laboratory for Microbial Molecular Biology, State Key Laboratory of Developmental Biology of Freshwater Fish, College of Life Science, Hunan Normal University, Changsha 410083, China
| | - Yang Liu
- Hunan Provincial Key Laboratory for Microbial Molecular Biology, State Key Laboratory of Developmental Biology of Freshwater Fish, College of Life Science, Hunan Normal University, Changsha 410083, China
| | - Ling Shuai
- Hunan Provincial Key Laboratory for Microbial Molecular Biology, State Key Laboratory of Developmental Biology of Freshwater Fish, College of Life Science, Hunan Normal University, Changsha 410083, China
| | - Li Cao
- Hunan Provincial Key Laboratory for Microbial Molecular Biology, State Key Laboratory of Developmental Biology of Freshwater Fish, College of Life Science, Hunan Normal University, Changsha 410083, China
| | - Zhudong Liu
- Hunan Provincial Key Laboratory for Microbial Molecular Biology, State Key Laboratory of Developmental Biology of Freshwater Fish, College of Life Science, Hunan Normal University, Changsha 410083, China
| | - Ziyuan Xia
- Hunan Provincial Key Laboratory for Microbial Molecular Biology, State Key Laboratory of Developmental Biology of Freshwater Fish, College of Life Science, Hunan Normal University, Changsha 410083, China
| | - Xuezhi Ding
- Hunan Provincial Key Laboratory for Microbial Molecular Biology, State Key Laboratory of Developmental Biology of Freshwater Fish, College of Life Science, Hunan Normal University, Changsha 410083, China
| | - Shengbiao Hu
- Hunan Provincial Key Laboratory for Microbial Molecular Biology, State Key Laboratory of Developmental Biology of Freshwater Fish, College of Life Science, Hunan Normal University, Changsha 410083, China
| | - Youming Zhang
- Hunan Provincial Key Laboratory for Microbial Molecular Biology, State Key Laboratory of Developmental Biology of Freshwater Fish, College of Life Science, Hunan Normal University, Changsha 410083, China
| | - Jie Rang
- Hunan Provincial Key Laboratory for Microbial Molecular Biology, State Key Laboratory of Developmental Biology of Freshwater Fish, College of Life Science, Hunan Normal University, Changsha 410083, China
| | - Liqiu Xia
- Hunan Provincial Key Laboratory for Microbial Molecular Biology, State Key Laboratory of Developmental Biology of Freshwater Fish, College of Life Science, Hunan Normal University, Changsha 410083, China
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Lack of N-Terminal Segment of the Flagellin Protein Results in the Production of a Shortened Polar Flagellum in the Deep-Sea Sedimentary Bacterium Pseudoalteromonas sp. Strain SM9913. Appl Environ Microbiol 2021; 87:e0152721. [PMID: 34406825 DOI: 10.1128/aem.01527-21] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Bacterial polar flagella, comprised of flagellin, are essential for bacterial motility. Pseudoalteromonas sp. strain SM9913 is a bacterium isolated from deep-sea sediments. Unlike other Pseudoalteromonas strains that have a long polar flagellum, strain SM9913 has an abnormally short polar flagellum. Here, we investigated the underlying reason for the short flagellum and found that a single-base mutation was responsible for the altered flagellar assembly. This mutation leads to the fragmentation of the flagellin gene into two genes, PSM_A2281, encoding the core segment and the C-terminal segment, and PSM_A2282, encoding the N-terminal segment, and only gene PSM_A2281 is involved in the production of the short polar flagellum. When a chimeric gene of PSM_A2281 and PSM_A2282 encoding an intact flagellin, A2281::82, was expressed, a long polar flagellum was produced, indicating that the N-terminal segment of flagellin contributes to the production of a polar flagellum of a normal length. Analyses of the simulated structures of A2281 and A2281::82 and that of the flagellar filament assembled with A2281::82 indicate that due to the lack of two α-helices, the core of the flagellar filament assembled with A2281 is incomplete and is likely too weak to support the stability and movement of a long flagellum. This mutation in strain SM9913 had little effect on its growth and only a small effect on its swimming motility, implying that strain SM9913 can live well with this mutation in natural sedimentary environments. This study provides a better understanding of the assembly and production of bacterial flagella. IMPORTANCE Polar flagella, which are essential organelles for bacterial motility, are comprised of multiple flagellin subunits. A flagellin molecule contains an N-terminal segment, a core segment, and a C-terminal segment. The results of this investigation of the deep-sea sedimentary bacterium Pseudoalteromonas sp. strain SM9913 demonstrate that a single-base mutation in the flagellin gene leads to the production of an incomplete flagellin without the N-terminal segment and that the loss of the N-terminal segment of the flagellin protein results in the production of a shortened polar flagellar filament. Our results shed light on the important function of the N-terminal segment of flagellin in the assembly and stability of bacterial flagellar filament.
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Liu M, Xu W, Zhu Y, Cui X, Pang X. The Response Regulator MacR and its Potential in Improvement of Antibiotic Production in Streptomyces coelicolor. Curr Microbiol 2021; 78:3696-3707. [PMID: 34426858 DOI: 10.1007/s00284-021-02633-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2021] [Accepted: 08/11/2021] [Indexed: 11/29/2022]
Abstract
We previously reported that the two-component system MacRS regulates morphogenesis and production of the blue-pigmented antibiotic actinorhodin (ACT) in Streptomyces coelicolor. In this study, the role of MacRS was further extended to include control of the production of the red-pigmented antibiotic undecylprodigiosin (RED) and the calcium-dependent antibiotic (CDA), and control of other important cellular activities. Our data indicated that disruption of the MacRS TCS reduced production not only of ACT but also of RED and CDA. RNA-Seq analysis revealed that genes involved in both secondary metabolism and primary metabolism are differentially expressed in the MacRS deletion mutant ΔmacRS. Moreover, we found that genes of the Zur regulon are also markedly downregulated in ΔmacRS, suggesting a role for macRS in zinc homeostasis. In addition to previously identified MacR sites with strong matches to the MacR consensus recognition sequence, a genome-wide search revealed over one hundred less-stringent matches, including potential sites upstream of absR1, crgA, and smeA. Electrophoretic mobility shift assays demonstrated that MacR binds some of these sites in vitro. Although there is no strong MacR site upstream of the ACT regulatory gene actII-orf4 (sco5085), we showed that an engineered MacR site enhanced ACT production, providing an approach for modulating production of useful compounds. Altogether, our work suggests an important role for MacRS in a range of cellular activities in Streptomyces and its potential application in strain engineering.
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Affiliation(s)
- Meng Liu
- The State Key Laboratory of Microbial Technology, Shandong University, Qingdao, 266237, China
| | - Wenhao Xu
- The State Key Laboratory of Microbial Technology, Shandong University, Qingdao, 266237, China
| | - Yanping Zhu
- The State Key Laboratory of Microbial Technology, Shandong University, Qingdao, 266237, China
| | - Xiqing Cui
- Deqiang Biology Co. Ltd, Harbin, 150060, China.
| | - Xiuhua Pang
- The State Key Laboratory of Microbial Technology, Shandong University, Qingdao, 266237, China.
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Zhu Y, Zhang P, Lu T, Wang X, Li A, Lu Y, Tao M, Pang X. Impact of MtrA on phosphate metabolism genes and the response to altered phosphate conditions in Streptomyces. Environ Microbiol 2021; 23:6907-6923. [PMID: 34390613 DOI: 10.1111/1462-2920.15719] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2021] [Revised: 06/29/2021] [Accepted: 08/10/2021] [Indexed: 01/21/2023]
Abstract
Phosphate metabolism is known to be regulated by the PhoPR regulatory system in Streptomyces and some other bacteria. In this study, we report that MtrA also regulates phosphate metabolism in Streptomyces. Our data showed that, in Streptomyces coelicolor, MtrA regulates not only phosphate metabolism genes such as phoA but also phoP under different phosphate conditions, including growth on rich complex media without added inorganic phosphate and on defined media with low or high concentrations of inorganic phosphate. Cross-regulation was also observed among mtrA, phoP and glnR under these conditions. We demonstrated both in vitro and in vivo binding of MtrA to the promoter regions of genes associated with phosphate metabolism and to the intergenic region between phoR and phoU, indicating that these phosphate metabolism genes are targets of MtrA. We further showed that MtrA in S. lividans and S. venezuelae has detectable regulatory effects on expression of phosphate metabolism genes. Additionally, the MtrA homologue from Corynebacterium glutamicum bound predicted MtrA sites of multiple phosphate metabolism genes, implying its potential for regulating phosphate metabolism in this species. Overall, our findings support MtrA as a major regulator for phosphate metabolism in Streptomyces and also potentially in other actinobacteria.
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Affiliation(s)
- Yanping Zhu
- The State Key Laboratory of Microbial Technology, Shandong University, Qingdao, China
| | - Peipei Zhang
- College of Biomedical Sciences, Shandong First Medical University, Jinan, China
| | - Ting Lu
- The State Key Laboratory of Microbial Technology, Shandong University, Qingdao, China
| | - Xinyuan Wang
- The State Key Laboratory of Microbial Technology, Shandong University, Qingdao, China
| | - Aiying Li
- The State Key Laboratory of Microbial Technology, Shandong University, Qingdao, China
| | - Yinhua Lu
- College of Life Sciences, Shanghai Normal University, Shanghai, China
| | - Meifeng Tao
- The State Key Laboratory of Microbial Metabolism, Shanghai Jiao Tong University, Shanghai, China
| | - Xiuhua Pang
- The State Key Laboratory of Microbial Technology, Shandong University, Qingdao, China
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Liu X, Ma J, Yang C, Wang L, Tang J. The toxicity effects of nano/microplastics on an antibiotic producing strain - Streptomyces coelicolor M145. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 764:142804. [PMID: 33131862 DOI: 10.1016/j.scitotenv.2020.142804] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2020] [Revised: 09/29/2020] [Accepted: 09/30/2020] [Indexed: 06/11/2023]
Abstract
The toxic effects of nano/microplastics on microorganisms are still unclear. In this study, Streptomyces coelicolor (S. coelicolor) M145 was selected to study the toxicity and mechanism of nano/microplastics (20 nm, 100 nm, 1 μm and 1 mm) at concentration of 0.1, 1 and 10 mg/L on microorganisms. Results showed that the cytotoxicity, reactive oxygen species (ROS) level, permeability, and antibiotic production of M145 cells changed significantly after the addition of nano/microplastics, and the trends were size and concentration dependent. After M145 was exposed to 10 mg/L of 20 nm nanoplastics, its fatality rate was 64.8%, which was the highest among the particle size of 20 nm to 1 mm at a concentration of 0.1-10 mg/L. And the ROS level and cell permeability also reached their highest values, which was about 2.7 folds and 2.2 folds of control, respectively. After this treatment, the maximum yields of actinorhodin and undecylprodigiosin were 6.7 and 5.3 mg/L, respectively. Transcriptome analysis indicated that nanoplastics could inhibit the transport capacity, primary metabolism, and oxidative phosphorylation of M145, and that the inhibition extend was negatively related to the particle size. Moreover, the toxicity of microplastics to M145 was significantly less than that of nanoplastics. This study provides a new perspective for understanding the toxicity of nano/microplastics on microorganisms in nature.
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Affiliation(s)
- Xiaomei Liu
- Key Laboratory of Pollution Processes and Environmental Criteria (Ministry of Education), Tianjin Engineering Research Center of Environmental Diagnosis and Contamination Remediation, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China
| | - Jingkang Ma
- Key Laboratory of Pollution Processes and Environmental Criteria (Ministry of Education), Tianjin Engineering Research Center of Environmental Diagnosis and Contamination Remediation, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China
| | - Chengliang Yang
- BCIG Environmental Remediation Co., Ltd, Tianjin 300042, China
| | - Lan Wang
- Key Laboratory of Pollution Processes and Environmental Criteria (Ministry of Education), Tianjin Engineering Research Center of Environmental Diagnosis and Contamination Remediation, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China
| | - Jingchun Tang
- Key Laboratory of Pollution Processes and Environmental Criteria (Ministry of Education), Tianjin Engineering Research Center of Environmental Diagnosis and Contamination Remediation, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China.
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