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Zhou J, Huang D, Liu C, Hu Z, Li H, Lou S. Research Progress in Heterologous Crocin Production. Mar Drugs 2023; 22:22. [PMID: 38248646 PMCID: PMC10820313 DOI: 10.3390/md22010022] [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: 11/24/2023] [Revised: 12/23/2023] [Accepted: 12/25/2023] [Indexed: 01/23/2024] Open
Abstract
Crocin is one of the most valuable components of the Chinese medicinal plant Crocus sativus and is widely used in the food, cosmetics, and pharmaceutical industries. Traditional planting of C. sativus is unable to fulfill the increasing demand for crocin in the global market, however, such that researchers have turned their attention to the heterologous production of crocin in a variety of hosts. At present, there are reports of successful heterologous production of crocin in Escherichia coli, Saccharomyces cerevisiae, microalgae, and plants that do not naturally produce crocin. Of these, the microalga Dunaliella salina, which produces high levels of β-carotene, the substrate for crocin biosynthesis, is worthy of attention. This article describes the biosynthesis of crocin, compares the features of each heterologous host, and clarifies the requirements for efficient production of crocin in microalgae.
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Affiliation(s)
- Junjie Zhou
- College of Life Sciences and Oceanography, Shenzhen University, Shenzhen 518060, China; (J.Z.); (D.H.); (C.L.); (Z.H.); (H.L.)
| | - Danqiong Huang
- College of Life Sciences and Oceanography, Shenzhen University, Shenzhen 518060, China; (J.Z.); (D.H.); (C.L.); (Z.H.); (H.L.)
| | - Chenglong Liu
- College of Life Sciences and Oceanography, Shenzhen University, Shenzhen 518060, China; (J.Z.); (D.H.); (C.L.); (Z.H.); (H.L.)
| | - Zhangli Hu
- College of Life Sciences and Oceanography, Shenzhen University, Shenzhen 518060, China; (J.Z.); (D.H.); (C.L.); (Z.H.); (H.L.)
- Shenzhen Engineering Laboratory for Marine Algal Biotechnology, Longhua Innovation Institute for Biotechnology, Shenzhen University, Shenzhen 518060, China
| | - Hui Li
- College of Life Sciences and Oceanography, Shenzhen University, Shenzhen 518060, China; (J.Z.); (D.H.); (C.L.); (Z.H.); (H.L.)
- Shenzhen Engineering Laboratory for Marine Algal Biotechnology, Longhua Innovation Institute for Biotechnology, Shenzhen University, Shenzhen 518060, China
| | - Sulin Lou
- College of Life Sciences and Oceanography, Shenzhen University, Shenzhen 518060, China; (J.Z.); (D.H.); (C.L.); (Z.H.); (H.L.)
- Shenzhen Engineering Laboratory for Marine Algal Biotechnology, Longhua Innovation Institute for Biotechnology, Shenzhen University, Shenzhen 518060, China
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When Carotenoid Biosynthesis Genes Met Escherichia coli : The Early Days and These Days. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2021. [PMID: 33783740 DOI: 10.1007/978-981-15-7360-6_15] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register]
Abstract
Nowadays, carotenoid biosynthetic pathways are sufficiently elucidated at gene levels in bacteria, fungi, and higher plants. Also, in pathway engineering for isoprenoid (terpene) production, carotenoids have been one of the most studied targets. However, in 1988 when the author started carotenoid research, almost no carotenoid biosynthesis genes were identified. It was because carotenogenic enzymes are easily inactivated when extracted from their organism sources, indicating that their purification and the subsequent cloning of the corresponding genes were infeasible or difficult. On the other hand, natural product chemistry of carotenoids had advanced a great deal. Thus, those days, carotenoid biosynthetic pathways had been proposed based mainly on the chemical structures of carotenoids without findings on relevant enzymes and genes. This chapter shows what happened on carotenoid research, when carotenoid biosynthesis genes met non-carotenogenic Escherichia coli around 1990, followed by subsequent developments.
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Carotenoid Production in Escherichia coli: Case of Acyclic Carotenoids. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2021. [PMID: 33783742 DOI: 10.1007/978-981-15-7360-6_17] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/15/2023]
Abstract
Among isoprenoids, carotenoids were the first group of compounds which were synthesized from foreign genes in non-carotenogenic Escherichia coli as a heterologous host. A great variety of carotenoids have been shown to be produced in E. coli due to the introduction of combinations of carotenoid biosynthesis genes, which were isolated from carotenogenic organisms. Carotenoids that have been produced in E. coli are mostly cyclic carotenoids that retain carbon 40 (C40) basic structure, except for acyclic carotene lycopene. On the other hand, acyclic carotenoids, which can also be produced in E. coli, comprise a group of carotenoids with diverse chain lengths, i.e., with C20, C30, C40, or C50 basic skeleton. As for acyclic C30, C40, and C50 carotenoids, carotenogenic genes of bacterial origin were needed, while a cleavage dioxygenase gene of higher-plant origin was utilized for the synthesis of acyclic C20 carotenoids. The present chapter is a review on the biosynthesis of such diverse acyclic carotenoids at the gene level.
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Zhao X, Gao L, Huang H, Zhao Y, Hanif A, Wu H, Gu Q, Wu L, Gao X. Exploring the pathogenic function of Pantoea ananatis endogenous plasmid by an efficient and simple plasmid elimination strategy. Microbiol Res 2021; 246:126710. [PMID: 33556709 DOI: 10.1016/j.micres.2021.126710] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2020] [Revised: 12/23/2020] [Accepted: 01/22/2021] [Indexed: 10/22/2022]
Abstract
The bacterium Pantoea ananatis is associated with devastating plant diseases that cause serious economic losses. Strain DZ-12 was previously isolated from maize brown rot leaves in Hebei Province, China and its genome sequencing revealed that it belongs to P. ananatis. It contains a large, endogenous plasmid, pDZ-12. Different studies have shown that virulence determinants are frequently carried on plasmids. To determine whether pDZ-12 from P. ananatis has any effect on pathogenicity, the plasmid was eliminated by substituting its native replication genes with temperature-sensitive replication genes. The resulting temperature-sensitive plasmid could be cured by growing cells at high temperature (37℃). Loss of pDZ-12 from P. ananatis DZ-12 led to a decreased disease severity in maize plants suggesting that the endogenous plasmid is important for pathogenesis. Loss of pDZ-12 also affected the ability of the bacterium to form biofilms. The study provides the first evidence that the endogenous plasmid of P. ananatis DZ-12 is important for pathogenesis in maize plants and carries genes involved in biofilm formation. This study also presents the first report on curing a plasmid from P. ananatis.
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Affiliation(s)
- Xiaozhen Zhao
- College of Plant Protection, Nanjing Agricultural University, Key Laboratory of Monitoring and Management of Crop Disease and Pest Insects, Ministry of Education, Nanjing 210095, China
| | - Lu Gao
- College of Plant Protection, Nanjing Agricultural University, Key Laboratory of Monitoring and Management of Crop Disease and Pest Insects, Ministry of Education, Nanjing 210095, China
| | - Hai Huang
- College of Plant Protection, Nanjing Agricultural University, Key Laboratory of Monitoring and Management of Crop Disease and Pest Insects, Ministry of Education, Nanjing 210095, China
| | - Yi Zhao
- College of Plant Protection, Nanjing Agricultural University, Key Laboratory of Monitoring and Management of Crop Disease and Pest Insects, Ministry of Education, Nanjing 210095, China
| | - Alvina Hanif
- College of Plant Protection, Nanjing Agricultural University, Key Laboratory of Monitoring and Management of Crop Disease and Pest Insects, Ministry of Education, Nanjing 210095, China
| | - Huijun Wu
- College of Plant Protection, Nanjing Agricultural University, Key Laboratory of Monitoring and Management of Crop Disease and Pest Insects, Ministry of Education, Nanjing 210095, China
| | - Qin Gu
- College of Plant Protection, Nanjing Agricultural University, Key Laboratory of Monitoring and Management of Crop Disease and Pest Insects, Ministry of Education, Nanjing 210095, China
| | - Liming Wu
- College of Plant Protection, Nanjing Agricultural University, Key Laboratory of Monitoring and Management of Crop Disease and Pest Insects, Ministry of Education, Nanjing 210095, China
| | - Xuewen Gao
- College of Plant Protection, Nanjing Agricultural University, Key Laboratory of Monitoring and Management of Crop Disease and Pest Insects, Ministry of Education, Nanjing 210095, China.
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Li T, Zhuo Y, Jin CZ, Wu X, Ko SR, Jin FJ, Ahn CY, Oh HM, Lee HG, Jin L. Genomic insights into a novel species Rhodoferax aquaticus sp. nov., isolated from freshwater. Int J Syst Evol Microbiol 2020; 70:4653-4660. [PMID: 32672530 DOI: 10.1099/ijsem.0.004325] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
A novel non-phototrophic member of the genus Rhodoferax was obtained from freshwater. The purpose of this study was to analyse the genome of a nonphototrophic strain and propose a new species based on its phylogenetic, genomic, physiological and chemotaxonomic characteristics. The results of phylogenetic analysis based on 16S rRNA gene sequences supports that the strain, designated Gr-4T, has a close relationship to the genus Rhodoferax. The observed average nucleotide identity (ANI) and digital DNA-DNA hybridization (dDDH) values between strain Gr-4T and its closest related strains were 72.3-74.6 % and 21.9-22.8 %, respectively. These values were much lower than the species separation thresholds for ANI or dDDH of 95-96 and 70 %, respectively, and in fact fall in the intergeneric range. Strain Gr-4T does not contain RuBisCO-related genes, but does contain GS/GOGAT pathway-related genes enabling nitrate ammonification. A polyphasic study and a genomic-level investigation were done to establish the taxonomic status of strain Gr-4T. Based on the phylogenetic, genomic and physiological differences, it is proposed that the isolate be classified to the genus Rhodoferax as Rhodoferax aquaticus sp. nov. with isolate Gr-4T (=KCTC 32394T=JCM 19166T) as the type strain.
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Affiliation(s)
- Taihua Li
- College of Biology and the Environment, Co-Innovation Centre for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing 210-037, PR China
| | - Ye Zhuo
- College of Biology and the Environment, Co-Innovation Centre for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing 210-037, PR China
| | - Chun-Zhi Jin
- Industrial Biomaterial Research Centre, Korea Research Institute of Bioscience & Biotechnology (KRIBB), Daejeon 34141, Republic of Korea.,Department of Bio-Molecular Science, KRIBB School of Bioscience, Korea University of Science and Technology (UST), 217 Gajeong-ro, Yuseong-gu, Daejeon, Republic of Korea
| | - Xuewen Wu
- College of Biology and the Environment, Co-Innovation Centre for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing 210-037, PR China
| | - So-Ra Ko
- Cell Factory Research Centre, Korea Research Institute of Bioscience & Biotechnology (KRIBB), Daejeon 34141, Republic of Korea
| | - Feng-Jie Jin
- College of Biology and the Environment, Co-Innovation Centre for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing 210-037, PR China
| | - Chi-Yong Ahn
- Cell Factory Research Centre, Korea Research Institute of Bioscience & Biotechnology (KRIBB), Daejeon 34141, Republic of Korea
| | - Hee-Mock Oh
- Cell Factory Research Centre, Korea Research Institute of Bioscience & Biotechnology (KRIBB), Daejeon 34141, Republic of Korea
| | - Hyung-Gwan Lee
- Cell Factory Research Centre, Korea Research Institute of Bioscience & Biotechnology (KRIBB), Daejeon 34141, Republic of Korea
| | - Long Jin
- College of Biology and the Environment, Co-Innovation Centre for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing 210-037, PR China
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He YW, Cao XQ, Poplawsky AR. Chemical Structure, Biological Roles, Biosynthesis and Regulation of the Yellow Xanthomonadin Pigments in the Phytopathogenic Genus Xanthomonas. MOLECULAR PLANT-MICROBE INTERACTIONS : MPMI 2020; 33:705-714. [PMID: 32027580 DOI: 10.1094/mpmi-11-19-0326-cr] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Xanthomonadins are membrane-bound yellow pigments that are typically produced by phytopathogenic bacterial Xanthomonas spp., Xylella fastidiosa, and Pseudoxanthomonas spp. They are also produced by a diversity of environmental bacterial species. Considerable research has revealed that they are a unique group of halogenated, aryl-polyene, water-insoluble pigments. Xanthomonadins have been shown to play important roles in epiphytic survival and host-pathogen interactions in the phytopathogen Xanthomonas campestris pv. campestris, which is the causal agent of black rot in crucifers. Here, we review recent advances in the understanding of xanthomonadin chemical structures, physiological roles, biosynthetic pathways, regulatory mechanisms, and crosstalk with other signaling pathways. The aim of the present review is to provide clues for further in-depth research on xanthomonadins from Xanthomonas and other related bacterial species.
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Affiliation(s)
- Ya-Wen He
- State Key Laboratory of Microbial Metabolism, Joint International Research Laboratory of Metabolic & Developmental Sciences, School of Life Sciences & Biotechnology, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Xue-Qiang Cao
- State Key Laboratory of Microbial Metabolism, Joint International Research Laboratory of Metabolic & Developmental Sciences, School of Life Sciences & Biotechnology, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Alan R Poplawsky
- Department of Entomology, Plant Pathology and Nematology, University of Idaho, Moscow, ID 83844, U.S.A
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Genome-scale metabolic models of Microbacterium species isolated from a high altitude desert environment. Sci Rep 2020; 10:5560. [PMID: 32221328 PMCID: PMC7101325 DOI: 10.1038/s41598-020-62130-8] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2019] [Accepted: 02/28/2020] [Indexed: 01/09/2023] Open
Abstract
The Atacama Desert is the most arid desert on Earth, focus of important research activities related to microbial biodiversity studies. In this context, metabolic characterization of arid soil bacteria is crucial to understand their survival strategies under extreme environmental stress. We investigated whether strain-specific features of two Microbacterium species were involved in the metabolic ability to tolerate/adapt to local variations within an extreme desert environment. Using an integrative systems biology approach we have carried out construction and comparison of genome-scale metabolic models (GEMs) of two Microbacterium sp., CGR1 and CGR2, previously isolated from physicochemically contrasting soil sites in the Atacama Desert. Despite CGR1 and CGR2 belong to different phylogenetic clades, metabolic pathways and attributes are highly conserved in both strains. However, comparison of the GEMs showed significant differences in the connectivity of specific metabolites related to pH tolerance and CO2 production. The latter is most likely required to handle acidic stress through decarboxylation reactions. We observed greater GEM connectivity within Microbacterium sp. CGR1 compared to CGR2, which is correlated with the capacity of CGR1 to tolerate a wider pH tolerance range. Both metabolic models predict the synthesis of pigment metabolites (β-carotene), observation validated by HPLC experiments. Our study provides a valuable resource to further investigate global metabolic adaptations of bacterial species to grow in soils with different abiotic factors within an extreme environment.
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Genomic and Metabolic Insights into Denitrification, Sulfur Oxidation, and Multidrug Efflux Pump Mechanisms in the Bacterium Rhodoferax sediminis sp. nov. Microorganisms 2020; 8:microorganisms8020262. [PMID: 32075304 PMCID: PMC7074706 DOI: 10.3390/microorganisms8020262] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2019] [Revised: 02/05/2020] [Accepted: 02/13/2020] [Indexed: 12/31/2022] Open
Abstract
This genus contains both phototrophs and nonphototrophic members. Here, we present a high-quality complete genome of the strain CHu59-6-5T, isolated from a freshwater sediment. The circular chromosome (4.39 Mbp) of the strain CHu59-6-5T has 64.4% G+C content and contains 4240 genes, of which a total of 3918 genes (92.4%) were functionally assigned to the COG (clusters of orthologous groups) database. Functional genes for denitrification (narGHJI, nirK and qnor) were identified on the genomes of the strain CHu59-6-5T, except for N2O reductase (nos) genes for the final step of denitrification. Genes (soxBXAZY) for encoding sulfur oxidation proteins were identified, and the FSD and soxF genes encoding the monomeric flavoproteins which have sulfide dehydrogenase activities were also detected. Lastly, genes for the assembly of two different RND (resistance-nodulation division) type efflux systems and one ABC (ATP-binding cassette) type efflux system were identified in the Rhodoferax sediminis CHu59-6-5T. Phylogenetic analysis based on 16S rRNA sequences and Average Nucleotide Identities (ANI) support the idea that the strain CHu59-6-5T has a close relationship to the genus Rhodoferax. A polyphasic study was done to establish the taxonomic status of the strain CHu59-6-5T. Based on these data, we proposed that the isolate be classified to the genus Rhodoferax as Rhodoferax sediminis sp. nov. with isolate CHu59-6-5T.
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Fidan O, Zhan J. Discovery and engineering of an endophytic Pseudomonas strain from Taxus chinensis for efficient production of zeaxanthin diglucoside. J Biol Eng 2019; 13:66. [PMID: 31388354 PMCID: PMC6676639 DOI: 10.1186/s13036-019-0196-x] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2019] [Accepted: 07/24/2019] [Indexed: 11/16/2022] Open
Abstract
BACKGROUND Endophytic microorganisms are a rich source of bioactive natural products. They are considered as promising biofertilizers and biocontrol agents due to their growth-promoting interactions with the host plants and their bioactive secondary metabolites that can help manage plant pathogens. Identification of new endophytes may lead to the discovery of novel molecules or provide new strains for production of valuable compounds. RESULTS In this study, we isolated an endophytic bacterium from the leaves of Taxus chinensis, which was identified as Pseudomonas sp. 102515 based on the 16S rRNA gene sequence and physiological characteristics. Analysis of its secondary metabolites revealed that this endophytic strain produces a major product zeaxanthin diglucoside, a promising antioxidant natural product that belongs to the family of carotenoids. A carotenoid (Pscrt) biosynthetic gene cluster was amplified from this strain, and the functions of PsCrtI and PsCrtY in the biosynthesis of zeaxanthin diglucoside were characterized in Escherichia coli BL21(DE3). The entire Pscrt biosynthetic gene cluster was successfully reconstituted in E. coli BL21(DE3) and Pseudomonas putida KT2440. The production of zeaxanthin diglucoside in Pseudomonas sp. 102515 was improved through the optimization of fermentation conditions such as medium, cultivation temperature and culture time. The highest yield under the optimized conditions reached 206 mg/L. The engineered strain of P. putida KT2440 produced zeaxanthin diglucoside at 121 mg/L in SOC medium supplemented with 0.5% glycerol at 18 °C, while the yield of zeaxanthin diglucoside in E. coli BL21(DE3) was only 2 mg/L. To further enhance the production, we introduced an expression plasmid harboring the Pscrt biosynthetic gene cluster into Pseudomonas sp. 102515. The yield in this engineered strain reached 380 mg/L, 85% higher than the wild type. Through PCR, we also discovered the presence of a turnerbactin biosynthetic gene cluster in Pseudomonas sp. 102515. Because turnerbactin is involved in nitrogen fixation, this endophytic strain might have a role in promoting growth of the host plant. CONCLUSIONS We isolated and identified an endophytic strain of Pseudomonas from T. chinensis. A zeaxanthin diglucoside biosynthetic gene cluster was discovered and characterized in this bacterium. Through fermentation and genetic engineering, the engineered strain produced zeaxanthin diglucoside at 380 ± 12 mg/L, representing a promising strain for the production of this antioxidant natural product. Additionally, Pseudomonas sp. 102515 might also be utilized as a plant-promoting strain for agricultural applications.
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Affiliation(s)
- Ozkan Fidan
- Department of Biological Engineering, Utah State University, 4105 Old Main Hill, Logan, UT 84322-4105 USA
| | - Jixun Zhan
- Department of Biological Engineering, Utah State University, 4105 Old Main Hill, Logan, UT 84322-4105 USA
- TCM and Ethnomedicine Innovation & Development Laboratory, School of Pharmacy, Hunan University of Chinese Medicine, Changsha, 410208 Hunan China
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Sandmann G. Antioxidant Protection from UV- and Light-Stress Related to Carotenoid Structures. Antioxidants (Basel) 2019; 8:antiox8070219. [PMID: 31336715 PMCID: PMC6680902 DOI: 10.3390/antiox8070219] [Citation(s) in RCA: 57] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2019] [Revised: 07/08/2019] [Accepted: 07/09/2019] [Indexed: 12/29/2022] Open
Abstract
This review summarizes studies of protection against singlet oxygen and radical damage by carotenoids. The main focus is on how substitutions of the carotenoid molecules determine high antioxidant activities such as singlet oxygen quenching and radical scavenging. Applied assays were carried out either in vitro in solvents or with liposomes, and in a few cases with living organisms. In the latter, protection by carotenoids especially of photosynthesis against light- and UV-stress is of major importance, but also heterotrophic organisms suffer from high light and UV exposure which can be alleviated by carotenoids. Carotenoids to be compared include C30, C40 and C50 molecules either acyclic, monocyclic or bicyclic with different substitutions including sugar and fatty acid moieties. Although some studies are difficult to compare, there is a tendency towards mono and bicyclic carotenoids with keto groups at C-4/C-4’ and the longest possible polyene structure functions to act best in singlet oxygen quenching and radical scavenging. Size of the carotenoid and lipophilic substituents such as fatty acids seem to be of minor importance for their activity but hydroxyl groups at an acyclic end and especially glycosylation of these hydroxyl groups enhance carotenoid activity.
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Affiliation(s)
- Gerhard Sandmann
- Institute of Molecular Biosciences, Goethe-University Frankfurt/M, Max von Laue Str. 9, D-60438 Frankfurt, Germany.
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Barretto DA, Vootla SK. In Vitro Anticancer Activity of Staphyloxanthin Pigment Extracted from Staphylococcus gallinarum KX912244, a Gut Microbe of Bombyx mori. Indian J Microbiol 2018; 58:146-158. [PMID: 29651173 DOI: 10.1007/s12088-018-0718-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2017] [Accepted: 03/08/2018] [Indexed: 01/27/2023] Open
Abstract
The present study reports the in vitro biological nature of the pigment produced by Staphylococcus gallinarum KX912244, isolated as the gut microflora bacterium of the insect Bombyx mori. The purified pigment was characterized as Staphyloxanthin based on bio-physical characterization techniques like Fourier transform infrared spectroscopy, high performance liquid chromatography, Proton nuclear magnetic resonance spectroscopy (1H NMR), Liquid chromatography-Mass spectroscopy and Gas chromatography-Mass spectroscopy. The Staphyloxanthin pigment presented considerable biological properties including in vitro antimicrobial activity against pathogens Staphylococcus aureus, Escherichia coli and Candida albicans; in vitro antioxidant activity by % DPPH free radical scavenging activity showing IC50 value of 54.22 µg/mL; DNA damage protection activity against reactive oxygen species and anticancer activity evaluated by cytotoxicity assay against 4 different cancer cell lines like the Dalton's lymphoma ascites with IC50 value 6.20 ± 0.02 µg/mL, Ehrlich ascites carcinoma having IC50 value 6.48 ± 0.15 µg/mL, Adenocarcinomic human alveolar basal epithelial cells (A549 Lung carcinoma) bearing IC50 value 7.23 ± 0.11 µg/mL and Mus mucus skin melanoma (B16F10) showing IC50 value 6.58 ± 0.38 µg/mL and less cytotoxicity towards non-cancerous human fibroblast cell lines (NIH3T3) with IC50 value of 52.24 µg/mL. The present study results suggest that Staphyloxanthin acts as a potential therapeutic agent especially due to its anticancer property.
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Affiliation(s)
- Delicia Avilla Barretto
- Department of Biotechnology and Microbiology, Karnatak University, Dharwad, 580003 Karnataka India
| | - Shyam Kumar Vootla
- Department of Biotechnology and Microbiology, Karnatak University, Dharwad, 580003 Karnataka India
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Genome Sequence of Rhodoferax antarcticus ANT.BR T; A Psychrophilic Purple Nonsulfur Bacterium from an Antarctic Microbial Mat. Microorganisms 2017; 5:microorganisms5010008. [PMID: 28230808 PMCID: PMC5374385 DOI: 10.3390/microorganisms5010008] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2017] [Revised: 02/16/2017] [Accepted: 02/18/2017] [Indexed: 12/23/2022] Open
Abstract
Rhodoferax antarcticus is an Antarctic purple nonsulfur bacterium and the only characterized anoxygenic phototroph that grows best below 20 °C. We present here a high-quality draft genome of Rfx. antarcticus strain ANT.BRT, isolated from an Antarctic microbial mat. The circular chromosome (3.8 Mbp) of Rfx. antarcticus has a 59.1% guanine + cytosine (GC) content and contains 4036 open reading frames. In addition, the bacterium contains a sizable plasmid (198.6 kbp, 48.4% GC with 226 open reading frames) that comprises about 5% of the total genetic content. Surprisingly, genes encoding light-harvesting complexes 1 and 3 (LH1 and LH3), but not light-harvesting complex 2 (LH2), were identified in the photosynthesis gene cluster of the Rfx. antarcticus genome, a feature that is unique among purple phototrophs. Consistent with physiological studies that showed a strong capacity for nitrogen fixation in Rfx. antarcticus, a nitrogen fixation gene cluster encoding a molybdenum-type nitrogenase was present, but no alternative nitrogenases were identified despite the cold-active phenotype of this phototroph. Genes encoding two forms of ribulose 1,5-bisphosphate carboxylase/oxygenase were present in the Rfx. antarcticus genome, a feature that likely provides autotrophic flexibility under varying environmental conditions. Lastly, genes for assembly of both type IV pili and flagella are present, with the latter showing an unusual degree of clustering. This report represents the first genomic analysis of a psychrophilic anoxygenic phototroph and provides a glimpse of the genetic basis for maintaining a phototrophic lifestyle in a permanently cold, yet highly variable, environment.
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Farci D, Slavov C, Tramontano E, Piano D. The S-layer Protein DR_2577 Binds Deinoxanthin and under Desiccation Conditions Protects against UV-Radiation in Deinococcus radiodurans. Front Microbiol 2016; 7:155. [PMID: 26909071 PMCID: PMC4754619 DOI: 10.3389/fmicb.2016.00155] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2015] [Accepted: 01/29/2016] [Indexed: 11/13/2022] Open
Abstract
Deinococcus radiodurans has the puzzling ability to withstand over a broad range of extreme conditions including high doses of ultraviolet radiation and deep desiccation. This bacterium is surrounded by a surface layer (S-layer) built of a regular repetition of several proteins, assembled to form a paracrystalline structure. Here we report that the deletion of a main constituent of this S-layer, the gene DR_2577, causes a decrease in the UVC resistance, especially in desiccated cells. Moreover, we show that the DR_2577 protein binds the carotenoid deinoxanthin, a strong protective antioxidant specific of this bacterium. A further spectroscopical characterization of the deinoxanthin-DR_2577 complex revealed features which could suggest a protective role of DR_2577. We propose that, especially under desiccation, the S-layer shields the bacterium from incident ultraviolet light and could behave as a first lane of defense against UV radiation.
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Affiliation(s)
- Domenica Farci
- Laboratory of Plant Physiology and Photobiology, Department of Life and Environmental Sciences, University of Cagliari Cagliari, Italy
| | - Chavdar Slavov
- Department of Physical Chemistry, Institute of Physical and Theoretical Chemistry Frankfurt am Main, Germany
| | - Enzo Tramontano
- Laboratory of Molecular Virology, Department of Life and Environmental Sciences, University of Cagliari Cagliari, Italy
| | - Dario Piano
- Laboratory of Plant Physiology and Photobiology, Department of Life and Environmental Sciences, University of CagliariCagliari, Italy; International Institute of Molecular and Cell BiologyWarsaw, Poland
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Crystal structure of 1'-OH-carotenoid 3,4-desaturase from Nonlabens dokdonensis DSW-6. Enzyme Microb Technol 2015; 77:29-37. [PMID: 26138397 DOI: 10.1016/j.enzmictec.2015.05.005] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2015] [Revised: 05/18/2015] [Accepted: 05/20/2015] [Indexed: 11/22/2022]
Abstract
The γ-carotenoids, such as myxol and saproxanthin, have a high potential to be utilized in nutraceutical and pharmaceutical industries for their neuro-protective and antioxidant effects. CrtD is involved in the production of γ-carotenoids by desaturating the C3'-C4' position of 1'-OH-γ-carotenoid. We determined the crystal structure of CrtD from Nonlabens dokdonensis DSW-6 (NdCrtD), the first structure of CrtD family enzymes. The NdCrtD structure was composed of two distinct domains, an FAD-binding domain and a substrate-binding domain, and the substrate-binding domain can be divided into two subdomains, a Rossmann fold-like subdomain and a lid subdomain. Although the FAD-binding domain showed a structure similar to canonical FAD-containing enzymes, the substrate-binding domain exhibited a novel structure to constitute a long and hydrophobic tunnel with a length of ∼40 Å. The molecular docking-simulation reveals that the tunnel provides an appropriate substrate-binding site for the carotenoid such as 1'-OH-γ-carotene with a length of ∼35 Å. We could predict residues related to recognize the 1'-hydroxyl group and to stabilize the hydrophobic end without hydroxyl group. Moreover, we suggest that the flexible entrance loop may undergo an open-closed formational change during the binding of the substrate.
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Using total internal reflection fluorescence microscopy to visualize rhodopsin-containing cells. Appl Environ Microbiol 2015; 81:3442-50. [PMID: 25769822 DOI: 10.1128/aem.00230-15] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2015] [Accepted: 03/04/2015] [Indexed: 01/03/2023] Open
Abstract
Sunlight is captured and converted to chemical energy in illuminated environments. Although (bacterio)chlorophyll-based photosystems have been characterized in detail, retinal-based photosystems, rhodopsins, have only recently been identified as important mediators of light energy capture and conversion. Recent estimates suggest that up to 70% of cells in some environments harbor rhodopsins. However, because rhodopsin autofluorescence is low-comparable to that of carotenoids and significantly less than that of (bacterio)chlorophylls-these estimates are based on metagenomic sequence data, not direct observation. We report here the use of ultrasensitive total internal reflection fluorescence (TIRF) microscopy to distinguish between unpigmented, carotenoid-producing, and rhodopsin-expressing bacteria. Escherichia coli cells were engineered to produce lycopene, β-carotene, or retinal. A gene encoding an uncharacterized rhodopsin, actinorhodopsin, was cloned into retinal-producing E. coli. The production of correctly folded and membrane-incorporated actinorhodopsin was confirmed via development of pink color in E. coli and SDS-PAGE. Cells expressing carotenoids or actinorhodopsin were imaged by TIRF microscopy. The 561-nm excitation laser specifically illuminated rhodopsin-containing cells, allowing them to be differentiated from unpigmented and carotenoid-containing cells. Furthermore, water samples collected from the Delaware River were shown by PCR to have rhodopsin-containing organisms and were examined by TIRF microscopy. Individual microorganisms that fluoresced under illumination from the 561-nm laser were identified. These results verify the sensitivity of the TIRF microscopy method for visualizing and distinguishing between different molecules with low autofluorescence, making it useful for analyzing natural samples.
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Dong S, Hong PY, Nguyen TH. Persistence of Bacteroides ovatus under simulated sunlight irradiation. BMC Microbiol 2014; 14:178. [PMID: 24993443 PMCID: PMC4099502 DOI: 10.1186/1471-2180-14-178] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2014] [Accepted: 06/26/2014] [Indexed: 01/27/2023] Open
Abstract
Background Bacteroides ovatus, a member of the genus Bacteroides, is considered for use in molecular-based methods as a general fecal indicator. However, knowledge on its fate and persistence after a fecal contamination event remains limited. In this study, the persistence of B. ovatus was evaluated under simulated sunlight exposure and in conditions similar to freshwater and seawater. By combining propidium monoazide (PMA) treatment and quantitative polymerase chain reaction (qPCR) detection, the decay rates of B. ovatus were determined in the presence and absence of exogenous photosensitizers and in salinity up to 39.5 parts per thousand at 27°C. Results UVB was found to be important for B. ovatus decay, averaging a 4 log10 of decay over 6 h of exposure without the presence of extracellular photosensitizers. The addition of NaNO2, an exogenous sensitizer producing hydroxyl radicals, did not significantly change the decay rate of B. ovatus in both low and high salinity water, while the exogenous sensitizer algae organic matter (AOM) slowed down the decay of B. ovatus in low salinity water. At seawater salinity, the decay rate of B. ovatus was slower than that in low salinity water, except when both NaNO2 and AOM were present. Conclusion The results of laboratory experiments suggest that if B. ovatus is released into either freshwater or seawater environment in the evening, 50% of it may be intact by the next morning; if it is released at noon, only 50% may be intact after a mere 5 min of full spectrum irradiation on a clear day. This study provides a mechanistic understanding to some of the important environmental relevant factors that influenced the inactivation kinetics of B. ovatus in the presence of sunlight irradiation, and would facilitate the use of B. ovatus to indicate the occurrence of fecal contamination.
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Affiliation(s)
| | - Pei-Ying Hong
- Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign, 205 N, Mathews, 3230 Newmark Lab, Urbana, IL 61801, USA.
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De Maayer P, Chan WY, Blom J, Venter SN, Duffy B, Smits THM, Coutinho TA. The large universal Pantoea plasmid LPP-1 plays a major role in biological and ecological diversification. BMC Genomics 2012; 13:625. [PMID: 23151240 PMCID: PMC3505739 DOI: 10.1186/1471-2164-13-625] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2012] [Accepted: 11/11/2012] [Indexed: 11/21/2022] Open
Abstract
Background Pantoea spp. are frequently isolated from a wide range of ecological niches and have various biological roles, as plant epi- or endophytes, biocontrol agents, plant-growth promoters or as pathogens of both plant and animal hosts. This suggests that members of this genus have undergone extensive genotypic diversification. One means by which this occurs among bacteria is through the acquisition and maintenance of plasmids. Here, we have analyzed and compared the sequences of a large plasmid common to all sequenced Pantoea spp. Results and discussion The Large PantoeaPlasmids (LPP-1) of twenty strains encompassing seven different Pantoea species, including pathogens and endo-/epiphytes of a wide range of plant hosts as well as insect-associated strains, were compared. The LPP-1 plasmid sequences range in size from ~281 to 794 kb and carry between 238 and 750 protein coding sequences (CDS). A core set of 46 proteins, encompassing 2.2% of the total pan-plasmid (2,095 CDS), conserved among all LPP-1 plasmid sequences, includes those required for thiamine and pigment biosynthesis. Phylogenetic analysis reveals that these plasmids have arisen from an ancestral plasmid, which has undergone extensive diversification. Analysis of the proteins encoded on LPP-1 also showed that these plasmids contribute to a wide range of Pantoea phenotypes, including the transport and catabolism of various substrates, inorganic ion assimilation, resistance to antibiotics and heavy metals, colonization and persistence in the host and environment, pathogenesis and antibiosis. Conclusions LPP-1 is universal to all Pantoea spp. whose genomes have been sequenced to date and is derived from an ancestral plasmid. LPP-1 encodes a large array of proteins that have played a major role in the adaptation of the different Pantoea spp. to their various ecological niches and their specialization as pathogens, biocontrol agents or benign saprophytes found in many diverse environments.
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Affiliation(s)
- Pieter De Maayer
- Forestry and Agricultural Biotechnology Institute, Department of Microbiology and Plant Pathology, University of Pretoria, Pretoria, South Africa.
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Biological role of pigment production for the bacterial phytopathogen Pantoea stewartii subsp. stewartii. Appl Environ Microbiol 2012; 78:6859-65. [PMID: 22820327 DOI: 10.1128/aem.01574-12] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Pantoea stewartii subsp. stewartii, the causal agent of Stewart's wilt of sweet corn, produces a yellow carotenoid pigment. A nonpigmented mutant was selected from a bank of mutants generated by random transposon mutagenesis. The transposon insertion site was mapped to the crtB gene, encoding a putative phytoene synthase, an enzyme involved in the early steps of carotenoid biosynthesis. We demonstrate here that the carotenoid pigment imparts protection against UV radiation and also contributes to the complete antioxidant pathway of P. stewartii. Moreover, production of this pigment is regulated by the EsaI/EsaR quorum-sensing system and significantly contributes to the virulence of the pathogen in planta.
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Udeigwe TK, Eze PN, Teboh JM, Stietiya MH. Application, chemistry, and environmental implications of contaminant-immobilization amendments on agricultural soil and water quality. ENVIRONMENT INTERNATIONAL 2011; 37:258-267. [PMID: 20832118 DOI: 10.1016/j.envint.2010.08.008] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2010] [Revised: 08/11/2010] [Accepted: 08/12/2010] [Indexed: 05/29/2023]
Abstract
Contaminants such as nitrogen (N), phosphorus (P), dissolved organic carbon (DOC), arsenic (As), heavy metals, and infectious pathogens are often associated with agricultural systems. Various soil and water remediation techniques including the use of chemical amendments have been employed to reduce the risks associated with these contaminants. This paper reviews the use of chemical amendments for immobilizing principal agricultural contaminants, the chemistry of contaminant immobilization, and the environmental consequences associated with the use of these chemical products. The commonly used chemical amendments were grouped into aluminum-, calcium-, and iron-containing products. Other products of interest include phosphorus-containing compounds and silicate clays. Mechanisms of contaminant immobilization could include one or a combination of the following: surface precipitation, adsorption to mineral surfaces (ion exchange and formation of stable complexes), precipitation as salts, and co-precipitation. The reaction pH, redox potential, clay minerals, and organic matter are potential factors that could control contaminant-immobilization processes. Reviews of potential environmental implications revealed that undesirable substances such as trace elements, fluoride, sulfate, total dissolved solids, as well as radioactive materials associated with some industrial wastes used as amendment could be leached to ground water or lost through runoff to receiving water bodies. The acidity or alkalinity associated with some of the industrial-waste amendments could also constitute a substantial environmental hazard. Chemical amendments could introduce elements capable of inducing or affecting the activities of certain lithotrophic microbes that could influence vital geochemical processes such as mineral dissolution and formation, weathering, and organic matter mineralization.
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Affiliation(s)
- Theophilus K Udeigwe
- Northeast Research Station, Louisiana State University AgCenter, St. Joseph, LA 71366, USA.
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20
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Wang JJ, Zhang H, Schroder JL, Udeigwe TK, Zhang Z, Dodla SK, Stietiya MH. Reducing Potential Leaching of Phosphorus, Heavy Metals, and Fecal Coliform From Animal Wastes Using Bauxite Residues. WATER, AIR, & SOIL POLLUTION 2011; 214:241-252. [DOI: 10.1007/s11270-010-0420-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/20/2023]
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Alkhedir H, Karlovsky P, Vidal S. Effect of light intensity on colour morph formation and performance of the grain aphid Sitobion avenae F. (Homoptera: Aphididae). JOURNAL OF INSECT PHYSIOLOGY 2010; 56:1999-2005. [PMID: 20826158 DOI: 10.1016/j.jinsphys.2010.08.025] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2009] [Revised: 08/30/2010] [Accepted: 08/31/2010] [Indexed: 05/26/2023]
Abstract
The grain aphid Sitobion avenae F., one of the major pest aphids of cereals in Central Europe, exhibits colour polymorphism, even within the same clones. Although there is evidence that green and brown morphs of S. avenae contain different carotenoids, the mechanisms determining the induction of colour morphs are unknown. The common understanding is that the formation of colour morphs is controlled by light and affected by genetic and environmental factors and by host plant species. So far, there is no unequivocal evidence that light intensity, photoperiod, or a mixture of several variables are involved in the induction of S. avenae colour formation, resulting in the induction of S. avenae colour formation and carotenoid synthesis. Here we determined the effect of light intensity on the colour formation and performance of ten clones of S. avenae with experiments that controlled for the effects of host plant and genetic factors. We found that some clones remained green under all test conditions. In other clones, colour morph formation was controlled by light. The synthesis of carotenoids correlated with changes in colour formation. Host plant did not affect colour formation in the ten clones studied. Although colour of the aphid clones did not affect their performance, high light intensity increased the fecundity and fresh weight of S. avenae clones, while low light intensity stimulated the production of alatae.
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Affiliation(s)
- Hussein Alkhedir
- Agricultural Entomology, Department of Crop Sciences, Georg-August-University Goettingen, Grisebachstrasse 6, 37077 Goettingen, Germany
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Gross J, Bhattacharya D. Uniting sex and eukaryote origins in an emerging oxygenic world. Biol Direct 2010; 5:53. [PMID: 20731852 PMCID: PMC2933680 DOI: 10.1186/1745-6150-5-53] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2010] [Accepted: 08/23/2010] [Indexed: 11/14/2022] Open
Abstract
Background Theories about eukaryote origins (eukaryogenesis) need to provide unified explanations for the emergence of diverse complex features that define this lineage. Models that propose a prokaryote-to-eukaryote transition are gridlocked between the opposing "phagocytosis first" and "mitochondria as seed" paradigms, neither of which fully explain the origins of eukaryote cell complexity. Sex (outcrossing with meiosis) is an example of an elaborate trait not yet satisfactorily addressed in theories about eukaryogenesis. The ancestral nature of meiosis and its dependence on eukaryote cell biology suggest that the emergence of sex and eukaryogenesis were simultaneous and synergic and may be explained by a common selective pressure. Presentation of the hypothesis We propose that a local rise in oxygen levels, due to cyanobacterial photosynthesis in ancient Archean microenvironments, was highly toxic to the surrounding biota. This selective pressure drove the transformation of an archaeal (archaebacterial) lineage into the first eukaryotes. Key is that oxygen might have acted in synergy with environmental stresses such as ultraviolet (UV) radiation and/or desiccation that resulted in the accumulation of reactive oxygen species (ROS). The emergence of eukaryote features such as the endomembrane system and acquisition of the mitochondrion are posited as strategies to cope with a metabolic crisis in the cell plasma membrane and the accumulation of ROS, respectively. Selective pressure for efficient repair of ROS/UV-damaged DNA drove the evolution of sex, which required cell-cell fusions, cytoskeleton-mediated chromosome movement, and emergence of the nuclear envelope. Our model implies that evolution of sex and eukaryogenesis were inseparable processes. Testing the hypothesis Several types of data can be used to test our hypothesis. These include paleontological predictions, simulation of ancient oxygenic microenvironments, and cell biological experiments with Archaea exposed to ROS and UV stresses. Studies of archaeal conjugation, prokaryotic DNA recombination, and the universality of nuclear-mediated meiotic activities might corroborate the hypothesis that sex and the nucleus evolved to support DNA repair. Implications of the hypothesis Oxygen tolerance emerges as an important principle to investigate eukaryogenesis. The evolution of eukaryotic complexity might be best understood as a synergic process between key evolutionary innovations, of which meiosis (sex) played a central role. Reviewers This manuscript was reviewed by Eugene V. Koonin, Anthony M. Poole, and Gáspár Jékely.
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Affiliation(s)
- Jeferson Gross
- Department of Ecology, Evolution and Natural Resources, Institute of Marine and Coastal Sciences, Rutgers, The State University of New Jersey, New Brunswick, 08901, USA
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Chu MK, Lin LF, Twu CS, Lin RH, Lin YC, Hsu ST, Tzeng KC, Huang HC. Unique features of Erwinia chrysanthemi (Dickeya dadantii) RA3B genes involved in the blue indigoidine production. Microbiol Res 2010; 165:483-95. [DOI: 10.1016/j.micres.2009.09.004] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2009] [Revised: 09/09/2009] [Accepted: 09/16/2009] [Indexed: 11/28/2022]
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Curtis TP, Mara DD, Silva SA. Influence of pH, Oxygen, and Humic Substances on Ability of Sunlight To Damage Fecal Coliforms in Waste Stabilization Pond Water. Appl Environ Microbiol 2010; 58:1335-43. [PMID: 16348698 PMCID: PMC195595 DOI: 10.1128/aem.58.4.1335-1343.1992] [Citation(s) in RCA: 183] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Simple beaker experiments established that light damages fecal coliforms in waste stabilization ponds by an oxygen-mediated exogenous photosensitization. Wavelengths of up to 700 nm were able to damage bacteria. The ability of wavelengths of >425 nm to damage fecal coliforms was dependent on the presence of dissolved sensitizers. The sensitizers were ubiquitous in raw sewage, unaffected by sewage treatment, not derivatives of bacteriochlorophyll or chlorophyll, absorbed well in UV light, and had a slight yellowish color; they are therefore believed to be humic substances. The ability of light to damage fecal coliforms was highly sensitive to, and completely dependent on, oxygen. Scavengers of H(2)O(2) and singlet oxygen could protect the bacteria from the effects of sunlight, but scavengers of hydroxyl radicals and superoxides could not. Light-mediated damage of fecal coliforms was highly sensitive to elevated pH values, which also enabled light with wavelengths of >425 nm (in the presence of the sensitizer) to damage the bacteria. We conclude that humic substances, pH, and dissolved oxygen are important variables in the process by which light damages microorganisms in this and other environments and that these variables should be considered in future research on, and models of, the effects of light.
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Affiliation(s)
- T P Curtis
- Department of Civil Engineering, University of Leeds, Leeds, LS2 9JT, United Kingdom, and Estacao Experimental de Tratamentos Biologicos de Esgotos Sanitarios, Universidade Federal da Paraiba, Campina Grande, Paraiba 58100, Brazil
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Andrews JS, Rolfe SA, Huang WE, Scholes JD, Banwart SA. Biofilm formation in environmental bacteria is influenced by different macromolecules depending on genus and species. Environ Microbiol 2010; 12:2496-507. [PMID: 20406292 DOI: 10.1111/j.1462-2920.2010.02223.x] [Citation(s) in RCA: 69] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The formation of biofilms by diverse bacteria isolated from contaminated soil and groundwater on model substrata with different surface properties was assessed in a multifactorial screen. Diverse attachment phenotypes were observed as measured by crystal violet dye retention and confocal laser scanning microscopy (CLSM). Bulk measurements of cell hydrophobicity had little predictive ability in determining whether biofilms would develop on hydrophobic or hydrophilic substrata. Therefore selected pairs of bacteria from the genera Rhodococcus, Pseudomonas and Sphingomonas that exhibited different attachment phenotypes were examined in more detail using CLSM and the lipophilic dye, Nile Red. The association of Rhodococcus sp. cell membranes with lipids was shown to influence the attachment properties of these cells, but this approach was not informative for Pseudomonas and Sphingomonas sp. Confocal Raman Microspectroscopy of Rhodococcus biofilms confirmed the importance of lipids in their formation and indicated that in Pseudomonas and Sphingomonas biofilms, nucleic acids and proteins, respectively, were important in identifying the differences in attachment phenotypes of the selected strains. Treatment of biofilms with DNase I confirmed a determining role for nucleic acids as predicted for Pseudomonas. This work demonstrates that the attachment phenotypes of microbes from environmental samples to different substrata varies markedly, a diverse range of macromolecules may be involved and that these differ significantly between genera. A combination of CLSM and Raman spectroscopy distinguished between phenotypes and could be used to identify the key macromolecules involved in cell attachment to surfaces for the specific cases studied.
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Affiliation(s)
- Johanna S Andrews
- The Cell-Mineral Research Centre, Kroto Research Institute, University of Sheffield, Broad Lane, Sheffield S3 7HQ, UK
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Genes involved in yellow pigmentation of Cronobacter sakazakii ES5 and influence of pigmentation on persistence and growth under environmental stress. Appl Environ Microbiol 2009; 76:1053-61. [PMID: 20038705 DOI: 10.1128/aem.01420-09] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Cronobacter spp. are opportunistic food-borne pathogens that are responsible for rare but highly fatal cases of meningitis and necrotizing enterocolitis in neonates. While the operon responsible for yellow pigmentation in Cronobacter sakazakii strain ES5 was described recently, the involvement of additional genes in pigment expression and the influence of pigmentation on the fitness of Cronobacter spp. have not been investigated. Thus, the aim of this study was to identify further genes involved in pigment expression in Cronobacter sakazakii ES5 and to assess the influence of pigmentation on growth and persistence under conditions of environmental stress. A knockout library was created using random transposon mutagenesis. The screening of 9,500 mutants for decreased pigment production identified 30 colorless mutants. The mapping of transposon insertion sites revealed insertions in not only the carotenoid operon but also in various other genes involved in signal transduction, inorganic ions, and energy metabolism. To determine the effect of pigmentation on fitness, colorless mutants (DeltacrtE, DeltacrtX, and DeltacrtY) were compared to the yellow wild type using growth and inactivation experiments, a macrophage assay, and a phenotype array. Among other findings, the colorless mutants grew at significantly increased rates under osmotic stress compared to that of the yellow wild type while showing increased susceptibility to desiccation. Moreover, DeltacrtE and DeltacrtY exhibited increased sensitivity to UVB irradiation.
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Maresca JA, Braff JC, Delong EF. Characterization of canthaxanthin biosynthesis genes from an uncultured marine bacterium. ENVIRONMENTAL MICROBIOLOGY REPORTS 2009; 1:524-534. [PMID: 23765931 DOI: 10.1111/j.1758-2229.2009.00075.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Carotenoids are isoprenoid pigments synthesized in plants, fungi, bacteria and archaea, with roles in light harvesting, protection from stress, and membrane and protein structures. To characterize carotenoid biosynthesis genes from oceanic microbes, a fosmid library derived from microbial samples collected in surface water of the Pacific Ocean was screened in Escherichia coli for pigment-expressing recombinant strains. One DNA fragment enabled production of a bright orange pigment, and was analysed further by sequence analysis and phenotypic characterization. The cloned DNA encoded a five-gene cluster predicted to be involved in the synthesis of canthaxanthin, a ketolated carotenoid. Each of these genes was inactivated by insertion of a transposon, and the biochemical function of each gene product was confirmed. Sequencing of related fosmids generated a 67 kb genomic contig, and comparative analyses suggested that the DNA may originate from a deltaproteobacterium. The carotenoid biosynthesis genes described here are related to well-characterized families of carotenoid biosynthesis genes, but also indicate that the organism harbouring them is only distantly related to any previously characterized bacterial types.
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Affiliation(s)
- Julia A Maresca
- Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
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Coohill TP, Sagripanti JL. Bacterial inactivation by solar ultraviolet radiation compared with sensitivity to 254 nm radiation. Photochem Photobiol 2009; 85:1043-52. [PMID: 19659922 DOI: 10.1111/j.1751-1097.2009.00586.x] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Our goal was to derive a quantitative factor that would allow us to predict the solar sensitivity of vegetative bacterial cells to natural solar radiation from the wealth of data collected for cells exposed to UVC (254 nm) radiation. We constructed a solar effectiveness spectrum for inactivation of vegetative bacterial cells by combining the available action spectra for vegetative cell killing in the solar range with the natural sunlight spectrum that reaches the ground. We then analyzed previous studies reporting the effects of solar radiation on vegetative bacterial cells and on bacterial spores. Although UVC-sensitive cells were also more sensitive to solar radiation, we found no absolute numerical correlation between the relative solar sensitivity of vegetative cells and their sensitivity to 254 nm radiation. The sensitivity of bacterial spores to solar exposure during both summer and winter correlated closely to their UVC sensitivity. The estimates presented here should make it possible to reasonably predict the time it would take for natural solar UV to kill bacterial spores or with a lesser degree of accuracy, vegetative bacterial cells after dispersion from an infected host or after an accidental or intentional release.
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Dussault D, Caillet S, Le Tien C, Lacroix M. Carotenoids' influence on radiotolerance of Pantoea agglomerans, a plant pathogen. Lett Appl Microbiol 2009; 47:208-13. [PMID: 19552787 DOI: 10.1111/j.1472-765x.2008.02410.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
AIM The aim of this study was to evaluate the effect of gamma radiation on the carotenoid content of two strains of the Enterobacteriaceae: Pantoea agglomerans. METHODS AND RESULTS Pantoea agglomerans strains ATCC 49174 and RL1 were used for this study. Successive radiation treatments were performed to study the radiotolerance. Total carotenoids were obtained by multiple extraction using chloroform/methanol (2 : 1), quantified by measuring the optical density at 453 nm and their antioxidant activity measured by a colorimetric method. The D(10) studies were conducted using a UC-15A irradiator loaded with 60Co. Bacterial counts from various dilutions were carried out after irradiation. Strain ATCC 49174 irradiated at 1 kGy produced 4.3 times more carotenoids than the control, whereas carotenoid synthesis increased by 2.9-fold in the strain RL1. However, there was no significant difference in the D(10) values. CONCLUSION Carotenoid increased production is influenced by gamma radiation but does not modify the tolerance to radiations. SIGNIFICANCE AND IMPACT OF THE STUDY To our knowledge, this is the first study to demonstrate the effects of gamma radiation on carotenoid production levels.
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Affiliation(s)
- D Dussault
- Canadian Irradiation Centre and Research Laboratories in Sciences Applied to Food, INRS-Institut Armand-Frappier, Laval, Quebec, Canada
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Chawengkijwanich C, Hayata Y. Development of TiO2 powder-coated food packaging film and its ability to inactivate Escherichia coli in vitro and in actual tests. Int J Food Microbiol 2008; 123:288-92. [PMID: 18262298 DOI: 10.1016/j.ijfoodmicro.2007.12.017] [Citation(s) in RCA: 320] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2007] [Revised: 12/11/2007] [Accepted: 12/18/2007] [Indexed: 11/28/2022]
Abstract
Titanium dioxide (TiO2) has attracted a great deal of attention as a photocatalytic disinfecting material in the food and environmental industry. TiO2 has been used to inactivate a wide variety of microorganisms in many applications. In the present study, we aimed to develop a TiO2 powder-coated packaging film and clarify its ability to inactivate Escherichia coli both in vitro and in actual tests, using two different particle sizes and two types of illumination at different intensities. No inhibition effect of the testing method itself on the growth of E. coli was observed. The cells of E. coli were found to have decreased 3 log CFU/ml after 180 min of illumination by two 20 W black-light bulbs (wavelength of 300-400 nm) on TiO2-coated oriented-polypropylene (OPP) film, while E. coli decreased 1 log CFU/m with black-light illumination of uncoated OPP film. The results showed that both ultraviolet A (UVA; wavelength of 315-400 nm) alone and TiO2-coated OPP film combined with UVA reduced the number of E. coli cell in vitro, but that the reduction of E. coli cell numbers was greater by TiO2-coated OPP film combined with UVA. The antimicrobial effect of TiO2-coated film is dependent on the UVA light intensity (0, <0.05 and 1 mW/cm2) and the kind of artificial light (black-light and daylight fluorescent bulbs), but it is independent of the particle size of TiO2 coating on the surface of OPP film. The surviving cell numbers of E. coli on TiO2-coated film decreased 3 log and 0.35 log CFU/ml after 180 min of illumination by two 20 W black bulbs and two 20 W daylight fluorescent bulbs, respectively. Despite the lesser efficacy of the photocatalytic method with fluorescent lights, the survival of E. coli cells using this method was 50% of that using fluorescent lights alone. In the actual test, the number of E. coli cells from cut lettuce stored in a TiO2-coated film bag irradiated with UVA light decreased from 6.4 on Day 0 to 4.9 log CFU/g on Day 1, while that of an uncoated film bag irradiated with UVA light decreased from 6.4 to 6.1 log CFU/g after 1 day of storage. The result shows that the TiO2-coated film could reduce the microbial contamination on the surface of solid food products and thus reduce the risks of microbial growth on fresh-cut produce.
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Affiliation(s)
- Chamorn Chawengkijwanich
- National Nanotechnology Center, National Science and Technology Development Agency, Thailand Science Park, Klong luang, Pathumthani 12120, Thailand.
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Cunningham FX, Gantt E. A portfolio of plasmids for identification and analysis of carotenoid pathway enzymes: Adonis aestivalis as a case study. PHOTOSYNTHESIS RESEARCH 2007; 92:245-59. [PMID: 17634749 DOI: 10.1007/s11120-007-9210-0] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/14/2007] [Accepted: 05/25/2007] [Indexed: 05/16/2023]
Abstract
Carotenoids are indispensable pigments of the photosynthetic apparatus in plants, algae, and cyanobacteria and are produced, as well, by many bacteria and fungi. Elucidation of biochemical pathways leading to the carotenoids that function in the photosynthetic membranes of land plants has been greatly aided by the use of carotenoid-accumulating strains of Escherichia coli as heterologous hosts for functional assays, in vivo, of the otherwise difficult to study membrane-associated pathway enzymes. This same experimental approach is uniquely well-suited to the discovery and characterization of yet-to-be identified enzymes that lead to carotenoids of the photosynthetic membranes in algal cells, to the multitude of carotenoids found in nongreen plant tissues, and to the myriad flavor and aroma compounds that are derived from carotenoids in plant tissues. A portfolio of plasmids suitable for the production in E. coli of a variety of carotenoids is presented herein. The use of these carotenoid-producing E. coli for the identification of cDNAs encoding enzymes of carotenoid and isoprenoid biosynthesis, for characterization of the enzymes these cDNAs encode, and for the production of specific carotenoids for use as enzyme substrates and reference standards, is described using the flowering plant Adonis aestivalis to provide examples. cDNAs encoding nine different A. aestivalis enzymes of carotenoid and isoprenoid synthesis were identified and the enzymatic activity of their products verified. Those cDNAs newly described include ones that encode phytoene synthase, beta-carotene hydroxylase, deoxyxylulose-5-phosphate synthase, isopentenyl diphosphate isomerase, and geranylgeranyl diphosphate synthase.
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Affiliation(s)
- Francis X Cunningham
- Department of Cell Biology and Molecular Genetics, University of Maryland, College Park, MD 20742, USA.
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Tardivo JP, Del Giglio A, de Oliveira CS, Gabrielli DS, Junqueira HC, Tada DB, Severino D, de Fátima Turchiello R, Baptista MS. Methylene blue in photodynamic therapy: From basic mechanisms to clinical applications. Photodiagnosis Photodyn Ther 2005; 2:175-91. [PMID: 25048768 DOI: 10.1016/s1572-1000(05)00097-9] [Citation(s) in RCA: 505] [Impact Index Per Article: 26.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2005] [Revised: 09/09/2005] [Accepted: 09/12/2005] [Indexed: 02/01/2023]
Abstract
Methylene blue (MB) is a molecule that has been playing important roles in microbiology and pharmacology for some time. It has been widely used to stain living organisms, to treat methemoglobinemia, and lately it has been considered as a drug for photodynamic therapy (PDT). In this review, we start from the fundamental photophysical, photochemical and photobiological characteristics of this molecule and evolved to show in vitro and in vivo applications related to PDT. The clinical cases shown include treatments of basal cell carcinoma, Kaposi's Sarcoma, melanoma, virus and fungal infections. We concluded that used together with a recently developed continuous light source (RL50(®)), MB has the potential to treat a variety of cancerous and non-cancerous diseases, with low toxicity and no side effects.
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Affiliation(s)
- João Paulo Tardivo
- Faculdade de Medicina ABC, Av. Príncipe de Gales, 821, C.P. 106, CEP 09060-650, Brazil
| | - Auro Del Giglio
- Faculdade de Medicina ABC, Av. Príncipe de Gales, 821, C.P. 106, CEP 09060-650, Brazil
| | | | | | | | - Dayane Batista Tada
- Departamento de Bioquímica, IQ-USP, C.P. 26077, 05513-970 São Paulo, SP, Brazil
| | - Divinomar Severino
- Departamento de Bioquímica, IQ-USP, C.P. 26077, 05513-970 São Paulo, SP, Brazil
| | | | - Mauricio S Baptista
- Departamento de Bioquímica, IQ-USP, C.P. 26077, 05513-970 São Paulo, SP, Brazil
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Tao L, Jackson RE, Rouvière PE, Cheng Q. Isolation of chromosomal mutations that affect carotenoid production in Escherichia coli: mutations alter copy number of ColE1-type plasmids. FEMS Microbiol Lett 2005; 243:227-33. [PMID: 15668023 DOI: 10.1016/j.femsle.2004.12.015] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2004] [Revised: 11/04/2004] [Accepted: 12/09/2004] [Indexed: 11/24/2022] Open
Abstract
Chromosomal mutants were isolated in Escherichia coli that altered carotenoid production from transformed carotenoid biosynthesis genes on a pACYC-derived plasmid (pPCB15). The mutations were mapped by sequencing. One group of mutations appeared to affect the cell metabolism without changing the copy number of the carotenoid synthesis plasmid. The other group of mutations either increased or decreased the copy number of the pPCB15 plasmid as determined by real-time PCR. The copy number change in most mutants was likely specific for ColE1-type plasmids for which copy number is controlled by a small antisense RNA. This collection of host strains would be useful for fine tuning expression of proteins and adjusting production of desired molecules without recloning to different vectors.
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Affiliation(s)
- Luan Tao
- Biological and Chemical Sciences and Engineering, Central Research and Development, E.I. DuPont de Nemours Inc., Wilmington, DE 19880-0328, USA
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Umeno D, Tobias AV, Arnold FH. Diversifying carotenoid biosynthetic pathways by directed evolution. Microbiol Mol Biol Rev 2005; 69:51-78. [PMID: 15755953 PMCID: PMC1082795 DOI: 10.1128/mmbr.69.1.51-78.2005] [Citation(s) in RCA: 163] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Microorganisms and plants synthesize a diverse array of natural products, many of which have proven indispensable to human health and well-being. Although many thousands of these have been characterized, the space of possible natural products--those that could be made biosynthetically--remains largely unexplored. For decades, this space has largely been the domain of chemists, who have synthesized scores of natural product analogs and have found many with improved or novel functions. New natural products have also been made in recombinant organisms, via engineered biosynthetic pathways. Recently, methods inspired by natural evolution have begun to be applied to the search for new natural products. These methods force pathways to evolve in convenient laboratory organisms, where the products of new pathways can be identified and characterized in high-throughput screening programs. Carotenoid biosynthetic pathways have served as a convenient experimental system with which to demonstrate these ideas. Researchers have mixed, matched, and mutated carotenoid biosynthetic enzymes and screened libraries of these "evolved" pathways for the emergence of new carotenoid products. This has led to dozens of new pathway products not previously known to be made by the assembled enzymes. These new products include whole families of carotenoids built from backbones not found in nature. This review details the strategies and specific methods that have been employed to generate new carotenoid biosynthetic pathways in the laboratory. The potential application of laboratory evolution to other biosynthetic pathways is also discussed.
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Affiliation(s)
- Daisuke Umeno
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California
| | - Alexander V. Tobias
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California
| | - Frances H. Arnold
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California
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Jacobs JL, Carroll TL, Sundin GW. The role of pigmentation, ultraviolet radiation tolerance, and leaf colonization strategies in the epiphytic survival of phyllosphere bacteria. MICROBIAL ECOLOGY 2005; 49:104-13. [PMID: 15883865 DOI: 10.1007/s00248-003-1061-4] [Citation(s) in RCA: 67] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/04/2003] [Accepted: 11/19/2003] [Indexed: 05/02/2023]
Abstract
Phenotypic mechanisms that enhance bacterial UVR survival typically include pigmentation and DNA repair mechanisms which provide protection from UVA and UVB wavelengths, respectively. In this study, we examined the contribution of pigmentation to field survival in Clavibacter michiganensis and evaluated differences in population dynamics and leaf colonization strategies. Two C. michiganensis pigment-deficient mutants were significantly reduced in UVA radiation survival in vitro; one of these mutants also exhibited reduced field populations on peanut when compared to the wild-type strain over the course of replicate 25-day experiments. The UVR-tolerant C. michiganensis strains G7.1 and G11.1 maintained larger epiphytic field populations on peanut compared to the UVR-sensitive C. michiganensis T5.1. Epiphytic field populations of C. michiganensis utilized the strategy of solar UVR avoidance during leaf colonization resulting in increased strain survival on leaves after UVC irradiation. These results further demonstrate the importance of UVR tolerance in the ability of bacterial strains to maintain population size in the phyllosphere. However, an examination of several bacterial species from the peanut phyllosphere and a collection of environmental Pseudomonas spp. revealed that sensitivity to UVA and UVC radiation was correlated in some but not all of these bacteria. These results underscore a need to further understand the biological effects of different solar wavelength groups on microbial ecology.
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Affiliation(s)
- J L Jacobs
- Department of Plant Pathology and Microbiology, Texas A & M University, College Station, TX 77843, USA
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Khosla C, Keasling JD. Metabolic engineering for drug discovery and development. Nat Rev Drug Discov 2004; 2:1019-25. [PMID: 14654799 DOI: 10.1038/nrd1256] [Citation(s) in RCA: 155] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Chaitan Khosla
- Department of Chemical Engineering, Stanford University, Stanford, California 94305, USA.
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Benchokroun S, Imziln B, Hassani L. Solar inactivation of mesophilic Aeromonas by exogenous photooxidation in high-rate algal pond treating waste water. J Appl Microbiol 2003; 94:531-8. [PMID: 12588563 DOI: 10.1046/j.1365-2672.2003.01867.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
AIMS Investigations were carried out to observe the effect of sunlight on the survival of mesophilic Aeromonas (A. caviae, A. hydrophila and A. sobria) in high-rate algal pond. METHODS AND RESULTS Light damage was estimated by loss of bacterial culturability, using simple beaker experiments. Survival of the strains studied under illuminated conditions was highly affected by the physico-chemical conditions within the microcosms. The inactivation of Aeromonas increased strongly as dissolved oxygen was increased, and was dependent on exogenous sensitizers. This process was enhanced by the high pH of water. Die-off of bacteria was prevented by adding catalase and pyruvate (H2O2 scavengers) into the microcosms. CONCLUSIONS The damage of Aeromonas was mainly due to exogenous photooxidation. Hydrogen peroxide at least was involved in light-induced damage of bacteria. Aeromonas sobria appeared to be slightly less sensitive to photooxidation than A. hydrophila and A. caviae. SIGNIFICANCE AND IMPACT OF STUDY The present study could explain the relative resistance of A. sobria to treatment in wastewater stabilization ponds.
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Affiliation(s)
- S Benchokroun
- Université Cadi Ayyad, Faculté des Sciences Semlalia, Département de Biologie, Laboratoire de Microbiologie, Marrakesh, Morocco
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Ashour J, Hondalus MK. Phenotypic mutants of the intracellular actinomycete Rhodococcus equi created by in vivo Himar1 transposon mutagenesis. J Bacteriol 2003; 185:2644-52. [PMID: 12670990 PMCID: PMC152612 DOI: 10.1128/jb.185.8.2644-2652.2003] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Rhodococcus equi is a facultative intracellular opportunistic pathogen of immunocompromised people and a major cause of pneumonia in young horses. An effective live attenuated vaccine would be extremely useful in the prevention of R. equi disease in horses. Toward that end, we have developed an efficient transposon mutagenesis system that makes use of a Himar1 minitransposon delivered by a conditionally replicating plasmid for construction of R. equi mutants. We show that Himar1 transposition in R. equi is random and needs no apparent consensus sequence beyond the required TA dinucleotide. The diversity of the transposon library was demonstrated by the ease with which we were able to screen for auxotrophs and mutants with pigmentation and capsular phenotypes. One of the pigmentation mutants contained an insertion in a gene encoding phytoene desaturase, an enzyme of carotenoid biosynthesis, the pathway necessary for production of the characteristic salmon color of R. equi. We identified an auxotrophic mutant with a transposon insertion in the gene encoding a putative dual-functioning GTP cyclohydrolase II-3,4-dihydroxy-2-butanone-4-phosphate synthase, an enzyme essential for riboflavin biosynthesis. This mutant cannot grow in minimal medium in the absence of riboflavin supplementation. Experimental murine infection studies showed that, in contrast to wild-type R. equi, the riboflavin-requiring mutant is attenuated because it is unable to replicate in vivo. The mutagenesis methodology we have developed will allow the characterization of R. equi virulence mechanisms and the creation of other attenuated strains with vaccine potential.
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Affiliation(s)
- Joseph Ashour
- Department of Immunology and Infectious Diseases, Harvard School of Public Health, Boston, Massachusetts 02115, USA
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Ehling-Schulz M, Schulz S, Wait R, Görg A, Scherer S. The UV-B stimulon of the terrestrial cyanobacterium Nostoc commune comprises early shock proteins and late acclimation proteins. Mol Microbiol 2002; 46:827-43. [PMID: 12410839 DOI: 10.1046/j.1365-2958.2002.03209.x] [Citation(s) in RCA: 60] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The UV-B and desiccation-tolerant terrestrial cyanobacterium Nostoc commune was grown under defined UV irradiation. Proteome changes were monitored in the membrane and the cytosolic and the extracellular fractions. Tools were developed to separate stress-triggered from growth stage-dependent changes. UV-B changed the relative cellular concentration of 493 out of 1,350 protein spots at least by a factor of three, rendering the UV-B stimulon of N. commune the most complex one described so far. It comprises two different parts: an early shock response influencing 214 proteins and a late acclimation response involving 279 proteins. The shock response comprised many membrane or membrane-associated proteins, whereas the acclimation response mainly changed cytosolic proteins. Most of the shock-induced changes were transient and did not overlap with the acclimation response. In the extracellular fraction, UV irradiation induced superoxide dismutase and the water stress protein. In total, 27 intracellular, UV-B-induced proteins were partially sequenced by electrospray ionization tandem mass spectrometry. Three functional classes were identified: proteins involved in lipid metabolism, in carbohydrate metabolism and in regulatory pathways. About 50% of the sequenced proteins were homologous to cyanobacterial database entries with un-known function. Interestingly, all of these proteins belong to the UV-B acclimation response. We conclude that the UV-B shock response and the UV-B acclimation response represent two completely different and remarkably complex strategies of N. commune to protect itself against UV-B radiation in its natural environment.
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Affiliation(s)
- Monika Ehling-Schulz
- Microbial Ecology Group, Department of Biosciences, WZW, Technische Universität München, D-85354 Freising, Germany
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Harada J, Nagashima KV, Takaichi S, Misawa N, Matsuura K, Shimada K. Phytoene desaturase, CrtI, of the purple photosynthetic bacterium, Rubrivivax gelatinosus, produces both neurosporene and lycopene. PLANT & CELL PHYSIOLOGY 2001; 42:1112-8. [PMID: 11673627 DOI: 10.1093/pcp/pce140] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Biosynthetic pathways for carotenoids in the purple photosynthetic bacterium, Rubrivivax gelatinosus, which synthesizes spirilloxanthin in addition to spheroidene and OH-spheroidene, were investigated by means of genetic manipulation. A phytoene desaturase gene (crtI) found in the photosynthesis gene cluster of this bacterium was expressed in an Escherichia coli strain that can produce phytoene. Both neurosporene and lycopene were synthesized in the recombinant, probably by three- and four-step desaturation reactions of CrtI. A mutant of RVI: gelatinosus lacking the crtI gene produced only phytoene, indicating that this organism had no other phytoene desaturases. When the crtI deletion mutant was complemented by the three-step phytoene desaturase of Rhodobacter capsulatus, spirilloxanthin and its precursors were not synthesized, although spheroidene and OH-spheroidene were accumulated. It was concluded that neurosporene and lycopene are produced by a single phytoene desaturase in RVI: gelatinosus resulting in the synthesis of spheroidene and spirilloxanthin, and that there are no pathways for spirilloxanthin synthesis via spheroidene.
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Affiliation(s)
- J Harada
- Department of Biology, Tokyo Metropolitan University, Minami-ohsawa 1-1, Hachioji, Tokyo, 192-0397 Japan.
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Giachino P, Engelmann S, Bischoff M. Sigma(B) activity depends on RsbU in Staphylococcus aureus. J Bacteriol 2001; 183:1843-52. [PMID: 11222581 PMCID: PMC95078 DOI: 10.1128/jb.183.6.1843-1852.2001] [Citation(s) in RCA: 195] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2000] [Accepted: 12/14/2000] [Indexed: 02/03/2023] Open
Abstract
Derivatives of the widely used laboratory strain Staphylococcus aureus NCTC8325, which are natural rsbU mutants, were shown to be unable to produce RsbU, a positive regulator of the alternative sigma factor sigma(B). The lack of RsbU prevented the heat-dependent production of sigma(B)-controlled transcripts and resulted in reduced H2O2 and UV tolerance, enhanced alpha-hemolysin activity, and the inability to produce the alkaline shock protein Asp23. After 48 h of growth, rsbU mutant strains failed to accumulate staphyloxanthin, the major stationary-phase carotenoid. Transcription of Asp23 was found to be exclusively controlled by sigma(B), making it an excellent target for the study of sigma(B) activity in S. aureus. Reporter gene experiments, using the firefly luciferase gene (luc+) fused to the sigma(B)-dependent promoter(s) of asp23, revealed that sigma(B) is almost inactive in 8325 derivatives. cis complementation of the 8325 derivative BB255 with the wild-type rsbU gene from strain COL produced the rsbU(+) derivative GP268, a strain possessing a sigma(B) activity profile comparable to that of the rsbU(+) wild-type strain Newman. In GP268, the heat inducibility of sigma(B)-dependent genes, Asp23 production, alpha-hemolysin activity, pigmentation, and susceptibility to H2O2 were restored to the levels observed in strain Newman, clearly demonstrating that RsbU is needed for activation of sigma(B) in S. aureus.
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Affiliation(s)
- P Giachino
- Institute of Medical Microbiology, University of Zürich, CH-8028 Zürich, Switzerland
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Poplawsky AR, Urban SC, Chun W. Biological role of xanthomonadin pigments in Xanthomonas campestris pv. campestris. Appl Environ Microbiol 2000; 66:5123-7. [PMID: 11097878 PMCID: PMC92432 DOI: 10.1128/aem.66.12.5123-5127.2000] [Citation(s) in RCA: 78] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Previous studies have indicated that the yellow pigments (xanthomonadins) produced by phytopathogenic Xanthomonas bacteria are unimportant during pathogenesis but may be important for protection against photobiological damage. We used a Xanthomonas campestris pv. campestris parent strain, single-site transposon insertion mutant strains, and chromosomally restored mutant strains to define the biological role of xanthomonadins. Although xanthomonadin mutant strains were comparable to the parent strain for survival when exposed to UV light; after their exposure to the photosensitizer toluidine blue and visible light, survival was greatly reduced. Chromosomally restored mutant strains were completely restored for survival in these conditions. Likewise, epiphytic survival of a xanthomonadin mutant strain was greatly reduced in conditions of high light intensity, whereas a chromosomally restored mutant strain was comparable to the parent strain for epiphytic survival. These results are discussed with respect to previous results, and a model for epiphytic survival of X. campestris pv. campestris is presented.
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Affiliation(s)
- A R Poplawsky
- Plant Pathology, Division, Department of Plant, Soil and Entomological Sciences, University of Idaho, Moscow, Idaho 83844-2339, USA.
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Hannibal L, Lorquin J, D'Ortoli NA, Garcia N, Chaintreuil C, Masson-Boivin C, Dreyfus B, Giraud E. Isolation and characterization of canthaxanthin biosynthesis genes from the photosynthetic bacterium Bradyrhizobium sp. strain ORS278. J Bacteriol 2000; 182:3850-3. [PMID: 10851005 PMCID: PMC94561 DOI: 10.1128/jb.182.13.3850-3853.2000] [Citation(s) in RCA: 59] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
A carotenoid biosynthesis gene cluster involved in canthaxanthin production was isolated from the photosynthetic Bradyrhizobium sp. strain ORS278. This cluster includes five genes identified as crtE, crtY, crtI, crtB, and crtW that are organized in at least two operons. The functional assignment of each open reading frame was confirmed by complementation studies.
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Affiliation(s)
- L Hannibal
- Laboratoire des Symbioses Tropicales et Méditerranéennes, IRD, CIRAD, AGRO-M, INRA, 34398 Montpellier, France
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45
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Poplawsky AR, Chun W. Xanthomonas campestris pv. campestris requires a functional pigB for epiphytic survival and host infection. MOLECULAR PLANT-MICROBE INTERACTIONS : MPMI 1998; 11:466-475. [PMID: 9612945 DOI: 10.1094/mpmi.1998.11.6.466] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
When cauliflower plants (Brassica oleraceae) were misted with bacterial suspensions of Xanthomonas campestris pv. campestris (causal agent of black rot of cruciferous plants), two separate populations of the pathogen were associated with the leaves. Initially, bacteria removable by sonication and sensitive to sodium hypochlorite treatment predominated (easily removable epiphytic bacteria, EREB). However, after 2 weeks, bacteria not removable by sonication and insensitive to sodium hypochlorite treatment were dominant. Although the exact location of this second population of the pathogen was not determined, evidence is presented to support its location in protected sites on the leaf surface, pigB of this pathogen is required for production of extracellular polysaccharide (EPS), xanthomonadin pigments, and the diffusible signal molecule, DF (diffusible factor). DF can extracellularly restore EPS and xanthomonadin production to pigB mutant strains. Parent strain B-24 and pigB mutant strain B24-B2 were identical for in planta growth and symptomatology after artificial infection by injection in leaf mid-veins. Subsequently, X. campestris pv. campestris parent strain B-24, Tn3HoHo1 pigB insertion mutation strain B24-B2, chromosomally restored pigB mutation strain B24-B2R, and strain B24-79 with a Tn3HoHo1 insertion in an unrelated part of the genome were compared for epiphytic survival on, and natural infection of, cauliflower. After application, strains B-24, B24-B2R, and B24-79 all maintained leaf EREB populations of between approximately 3 and 6 (log [1 + CFU per g of fresh weight]) over a 3-week period, whereas B24-B2 populations fell to nearly undetectable levels. Plants sprayed with strains B-24, B24-B2R, and B24-79 averaged between 1.0 and 1.2 lesions, whereas those sprayed with B24-B2 averaged only 0.03 lesions per plant after 3 weeks. Differences in EREB population levels did not explain the observed differences in host infection frequencies, and the results indicated that strain B24-B2 was reduced in its ability to infect the host via the hydathodes, but unaffected in infection via wounds. When strains B-24 and B24-B2 were mixed in equal numbers and sprayed on plants together, B24-B2 epiphytic populations were intermediate between those of B-24 applied alone and B24-B2 applied alone. These results indicate that a functional pigB is required for epiphytic survival and natural host infection under the experimental conditions tested, and suggest that DF, xanthomonadins, and EPS could all be important for survival of this pathogen on the leaf surface, and/or for host infection.
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Affiliation(s)
- A R Poplawsky
- Department of Plant, Soil and Entomological Sciences, University of Idaho, Moscow 83844-2339, USA.
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46
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Sandmann G, Kuhn S, Böger P. Evaluation of structurally different carotenoids in Escherichia coli transformants as protectants against UV-B radiation. Appl Environ Microbiol 1998; 64:1972-4. [PMID: 9572984 PMCID: PMC106263 DOI: 10.1128/aem.64.5.1972-1974.1998] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Escherichia coli cells transformed with several carotenogenic genes to mediate the formation of zeta-carotene, neurosporene, lycopene, beta-carotene, and zeaxanthin were exposed to UV-B radiation. Short-term kinetics revealed that endogenous levels of neurosporene and beta-carotene protected E. coli against irradiation with UV-B. Zeaxanthin protected against only the photosensitized UV-B treatment. All other carotenoids were ineffective.
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Affiliation(s)
- G Sandmann
- Botanisches Institut, Fachbereich Biologie, J. W. Goethe Universität, Frankfurt, Germany.
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Calcutt MJ, Becker-Hapak M, Gaut M, Hoerter J, Eisenstark A. The rpoS gene of Erwinia carotovora: gene organization and functional expression in E. coli. FEMS Microbiol Lett 1998; 159:275-81. [PMID: 9503622 DOI: 10.1111/j.1574-6968.1998.tb12872.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
rpoS homologues were identified in several Erwinia species using Escherichia coli rpoS sequences as probes. The rpoS gene from Erwinia carotovora was cloned and the deduced amino acid sequence had 91% identity to E. coli RpoS. The latter sigma factor regulates the stationary phase inducible HPII catalase activity of E. coli. In an E. coli rpoS mutant, the E. carotovora rpoS gene was also able to regulate synthesis of this catalase. The presence of a similar catalase in E. carotovora suggests that the structural gene for this may be part of the rpoS 'regulon' in Erwinia also. This study also showed that there are several differences in the gene organization of the rpoS region of the E. coli and E. carotovora chromosomes.
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Affiliation(s)
- M J Calcutt
- Cancer Research Center, Columbia, MO 65201, USA
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48
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Abstract
Carotenoids represent one of the most widely distributed and structurally diverse classes of natural pigments, with important functions in photosynthesis, nutrition, and protection against photooxidative damage. In the eubacterial community, yellow, orange, and red carotenoids are produced by anoxygenic photosynthetic bacteria, cyanobacteria, and certain species of nonphotosynthetic bacteria. Many eukaryotes, including all algae and plants, as well as some fungi, also synthesize these pigments. In noncarotenogenic organisms, such as mammals, birds, amphibians, fish, crustaceans, and insects, dietary carotenoids and their metabolites also serve important biological roles. Within the last decade, major advances have been made in the elucidation of the molecular genetics, the biochemistry, and the regulation of eubacterial carotenoid biosynthesis. These developments have important implications for eukaryotes, and they make increasingly attractive the genetic manipulation of carotenoid content for biotechnological purposes.
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Affiliation(s)
- G A Armstrong
- Institute for Plant Sciences, Plant Genetics, Swiss Federal Institute of Technology (ETH), Zürich.
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Rajagopal L, Sundari CS, Balasubramanian D, Sonti RV. The bacterial pigment xanthomonadin offers protection against photodamage. FEBS Lett 1997; 415:125-8. [PMID: 9350981 DOI: 10.1016/s0014-5793(97)01109-5] [Citation(s) in RCA: 81] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Xanthomonas oryzae pv. oryzae is a bacterial pathogen that causes leaf blight, a serious disease of rice. Most members of the genus Xanthomonas produce yellow, membrane bound, brominated aryl polyene pigments called xanthomonadins whose functional role is unclear. We find that pigment-deficient mutants of X. oryzae pv. oryzae exhibit hypersensitivity to photobiological damage. A clone containing the xanthomonadin biosynthetic gene cluster alleviates the hypersensitivity of the pigment-deficient mutant. Extracts containing xanthomonadin provide protection against photodynamic lipid peroxidation in liposomes. These results lead us to suggest a role for the pigment, namely protection against photodamage.
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Affiliation(s)
- L Rajagopal
- Centre for Cellular and Molecular Biology, Hyderabad, India
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50
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An GH. Photosensitization of the yeast Phaffia rhodozyma at a low temperature for screening carotenoid hyperproducing mutants. Appl Biochem Biotechnol 1997; 66:263-8. [PMID: 9276924 DOI: 10.1007/bf02785592] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Phaffia rhodozyma strain Ant-1 produces more carotenoids, known as antioxidants, but it was more sensitive to light plus toluidine blue O (TBO), a superoxide producer, than wild strain 67-385 at 20 degrees C. Carotenoid hyperproducing mutants (CHMs), Ant-1 and 2A2N, exhibited decreased activity of superoxide dismutase (SOD) compared to 67-385, and this is in part responsible for hypersensitivity of the mutants to photosensitization. Light plus TBO at 2 degrees C allowed carotenoid hyperproducing mutants to produce higher colony-forming units than the wild-type. Photosensitization with limited cell metabolism by a low temperature, provides an idea of selective conditions for carotenoid hyperproducers of P. rhodozyma.
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Affiliation(s)
- G H An
- Department of Biology, Massachusetts Institute of Technology, Cambridge 02139, USA
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