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Díaz T, Fillet S, Campoy S, Vázquez R, Viña J, Murillo J, Adrio JL. Combining evolutionary and metabolic engineering in Rhodosporidium toruloides for lipid production with non-detoxified wheat straw hydrolysates. Appl Microbiol Biotechnol 2018; 102:3287-3300. [DOI: 10.1007/s00253-018-8810-2] [Citation(s) in RCA: 41] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2017] [Revised: 01/17/2018] [Accepted: 01/22/2018] [Indexed: 12/28/2022]
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Fillet S, Ronchel C, Callejo C, Fajardo MJ, Moralejo H, Adrio JL. Engineering Rhodosporidium toruloides for the production of very long-chain monounsaturated fatty acid-rich oils. Appl Microbiol Biotechnol 2017; 101:7271-7280. [DOI: 10.1007/s00253-017-8461-8] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2017] [Revised: 07/03/2017] [Accepted: 07/30/2017] [Indexed: 12/26/2022]
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Fillet S, Gibert J, Suárez B, Lara A, Ronchel C, Adrio JL. Fatty alcohols production by oleaginous yeast. J Ind Microbiol Biotechnol 2015; 42:1463-72. [PMID: 26318028 PMCID: PMC4607723 DOI: 10.1007/s10295-015-1674-x] [Citation(s) in RCA: 72] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2015] [Accepted: 08/10/2015] [Indexed: 01/28/2023]
Abstract
We have engineered Rhodosporidium toruloides to produce fatty alcohols by expressing a fatty acyl-CoA reductase from Marinobacter aquaeolei VT8. Production of fatty alcohols in flasks was achieved in different fermentation media at titers ranging from 0.2 to 2 g/L. In many of the conditions tested, more than 80 % of fatty alcohols were secreted into the cultivation broth. Through fed-batch fermentation in 7 L bioreactors, over 8 g/L of C16–C18 fatty alcohols were produced using sucrose as the substrate. This is the highest titer ever reported on microbial production of fatty alcohols to date.
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Affiliation(s)
- Sandy Fillet
- Neol Biosolutions SA, Avda. Innovación, 1, Edificio BIC-213, Parque Tecnológico de La Salud, 18016, Granada, Spain
| | - Jordi Gibert
- Neol Biosolutions SA, Avda. Innovación, 1, Edificio BIC-213, Parque Tecnológico de La Salud, 18016, Granada, Spain
| | - Beatriz Suárez
- Neol Biosolutions SA, Avda. Innovación, 1, Edificio BIC-213, Parque Tecnológico de La Salud, 18016, Granada, Spain
| | - Armando Lara
- Neol Biosolutions SA, Avda. Innovación, 1, Edificio BIC-213, Parque Tecnológico de La Salud, 18016, Granada, Spain
| | - Carmen Ronchel
- Neol Biosolutions SA, Avda. Innovación, 1, Edificio BIC-213, Parque Tecnológico de La Salud, 18016, Granada, Spain
| | - José L Adrio
- Neol Biosolutions SA, Avda. Innovación, 1, Edificio BIC-213, Parque Tecnológico de La Salud, 18016, Granada, Spain.
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Molina-Santiago C, Daddaoua A, Fillet S, Duque E, Ramos JL. Interspecies signalling: Pseudomonas putida efflux pump TtgGHI is activated by indole to increase antibiotic resistance. Environ Microbiol 2014; 16:1267-81. [PMID: 24373097 DOI: 10.1111/1462-2920.12368] [Citation(s) in RCA: 65] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2013] [Accepted: 12/14/2013] [Indexed: 12/13/2022]
Abstract
In Gram-negative bacteria, multidrug efflux pumps are responsible for the extrusion of chemicals that are deleterious for growth. Some of these efflux pumps are induced by endogenously produced effectors, while abiotic or biotic signals induce the expression of other efflux pumps. In Pseudomonas putida, the TtgABC efflux pump is the main antibiotic extrusion system that respond to exogenous antibiotics through the modulation of the expression of this operon mediated by TtgR. The plasmid-encoded TtgGHI efflux pump in P. putida plays a minor role in antibiotic resistance in the parental strain; however, its role is critical in isogenic backgrounds deficient in TtgABC. Expression of ttgGHI is repressed by the TtgV regulator that recognizes indole as an effector, although P. putida does not produce indole itself. Because indole is not produced by Pseudomonas, the indole-dependent antibiotic resistance seems to be part of an antibiotic resistance programme at the community level. Pseudomonas putida recognizes indole added to the medium or produced by Escherichia coli in mixed microbial communities. Transcriptomic analyses revealed that the indole-specific response involves activation of 43 genes and repression of 23 genes. Indole enhances not only the expression of the TtgGHI pump but also a set of genes involved in iron homeostasis, as well as genes for amino acid catabolism. In a ttgABC-deficient P. putida, background ampicillin and other bactericidal compounds lead to cell death. Co-culture of E. coli and P. putida ΔttgABC allowed growth of the P. putida mutant in the presence of ampicillin because of induction of the indole-dependent efflux pump.
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Affiliation(s)
- Carlos Molina-Santiago
- Consejo Superior de Investigaciones Científicas, Estación Experimental del Zaidín, 18008, Granada, Spain
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Daddaoua A, Fillet S, Fernández M, Udaondo Z, Krell T, Ramos JL. Genes for carbon metabolism and the ToxA virulence factor in Pseudomonas aeruginosa are regulated through molecular interactions of PtxR and PtxS. PLoS One 2012; 7:e39390. [PMID: 22844393 PMCID: PMC3402500 DOI: 10.1371/journal.pone.0039390] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2012] [Accepted: 05/21/2012] [Indexed: 11/19/2022] Open
Abstract
Homologs of the transcriptional regulator PtxS are omnipresent in Pseudomonas, whereas PtxR homologues are exclusively found in human pathogenic Pseudomonas species. In all Pseudomonas sp., PtxS with 2-ketogluconate is the regulator of the gluconate degradation pathway and controls expression from its own promoter and also from the P(gad) and P(kgu) for the catabolic operons. There is evidence that PtxS and PtxR play a central role in the regulation of exotoxin A expression, a relevant primary virulence factor of Pseudomonas aeruginosa. We show using DNaseI-footprint analysis that in P. aeruginosa PtxR binds to the -35 region of the P(toxA) promoter in front of the exotoxin A gene, whereas PtxS does not bind to this promoter. Bioinformatic and DNaseI-footprint analysis identified a PtxR binding site in the P(kgu) and P(gad) promoters that overlaps the -35 region, while the PtxS operator site is located 50 bp downstream from the PtxR site. In vitro, PtxS recognises PtxR with nanomolar affinity, but this interaction does not occur in the presence of 2-ketogluconate, the specific effector of PtxS. DNAaseI footprint assays of P(kgu) and P(gad) promoters with PtxS and PtxR showed a strong region of hyper-reactivity between both regulator binding sites, indicative of DNA distortion when both proteins are bound; however in the presence of 2-ketogluconate no protection was observed. We conclude that PtxS modulates PtxR activity in response to 2-ketogluconate by complex formation in solution in the case of the P(toxA) promoter, or via the formation of a DNA loop as in the regulation of gluconate catabolic genes. Data suggest two different mechanisms of control exerted by the same regulator.
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Affiliation(s)
| | - Sandy Fillet
- Department of Environmental Protection, CSIC-EEZ, Granada, Spain
| | | | - Zulema Udaondo
- Department of Environmental Protection, CSIC-EEZ, Granada, Spain
| | - Tino Krell
- Department of Environmental Protection, CSIC-EEZ, Granada, Spain
| | - Juan L. Ramos
- Department of Environmental Protection, CSIC-EEZ, Granada, Spain
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Krell T, Lacal J, Guazzaroni ME, Busch A, Silva-Jiménez H, Fillet S, Reyes-Darías JA, Muñoz-Martínez F, Rico-Jiménez M, García-Fontana C, Duque E, Segura A, Ramos JL. Responses of Pseudomonas putida to toxic aromatic carbon sources. J Biotechnol 2012; 160:25-32. [DOI: 10.1016/j.jbiotec.2012.01.026] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2011] [Revised: 01/16/2012] [Accepted: 01/24/2012] [Indexed: 10/14/2022]
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Segura A, Molina L, Fillet S, Krell T, Bernal P, Muñoz-Rojas J, Ramos JL. Solvent tolerance in Gram-negative bacteria. Curr Opin Biotechnol 2012; 23:415-21. [DOI: 10.1016/j.copbio.2011.11.015] [Citation(s) in RCA: 113] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2011] [Revised: 10/29/2011] [Accepted: 11/11/2011] [Indexed: 10/14/2022]
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Fillet S, Daniels C, Pini C, Krell T, Duque E, Bernal P, Segura A, Lu D, Zhang X, Ramos JL. Transcriptional control of the main aromatic hydrocarbon efflux pump in Pseudomonas. Environ Microbiol Rep 2012; 4:158-167. [PMID: 23757269 DOI: 10.1111/j.1758-2229.2011.00255.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Bacteria of the species Pseudomonas putida are ubiquitous soil inhabitants, and a few strains are able to thrive in the presence of extremely high concentrations of toxic solvents such as toluene and related aromatic hydrocarbons. Toluene tolerance is multifactorial in the sense that bacteria use a wide range of physiological and genetic changes to overcome solvent damage. This includes enhanced membrane impermeabilization through cis to trans isomerization of unsaturated fatty acids, activation of a stress response programme, and induction of efflux pumps that expulse toxic hydrocarbons to the outer medium. The most relevant element in this toluene tolerance arsenal is the TtgGHI efflux pump controlled by the TtgV regulator. We discuss here how TtgV controls expression of this efflux pump in response to solvents.
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Affiliation(s)
- Sandy Fillet
- Consejo Superior de Investigaciones Científicas, EEZ, Department of Environmental Protection, Granada, Spain. University of Toronto, Department of Banting and Best Department of Medical Research, Toronto, Canada. Imperial College of Science and Technology, London, UK
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Lu D, Fillet S, Meng C, Alguel Y, Kloppsteck P, Bergeron J, Krell T, Gallegos MT, Ramos J, Zhang X. Crystal structure of TtgV in complex with its DNA operator reveals a general model for cooperative DNA binding of tetrameric gene regulators. Genes Dev 2010; 24:2556-65. [PMID: 21078819 DOI: 10.1101/gad.603510] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
The majority of bacterial gene regulators bind as symmetric dimers to palindromic DNA operators of 12-20 base pairs (bp). Multimeric forms of proteins, including tetramers, are able to recognize longer operator sequences in a cooperative manner, although how this is achieved is not well understood due to the lack of complete structural information. Models, instead of structures, of complete tetrameric assembly on DNA exist in literature. Here we present the crystal structures of the multidrug-binding protein TtgV, a gene repressor that controls efflux pumps, alone and in complex with a 42-bp DNA operator containing two TtgV recognition sites at 2.9 Å and 3.4 Å resolution. These structures represent the first full-length functional tetrameric protein in complex with its intact DNA operator containing two continuous recognition sites. TtgV binds to its DNA operator as a highly asymmetric tetramer and induces considerable distortions in the DNA, resulting in a 60° bend. Upon binding to its operator, TtgV undergoes large conformational changes at the monomeric, dimeric, and tetrameric levels. The structures here reveal a general model for cooperative DNA binding of tetrameric gene regulators and provide a structural basis for a large body of biochemical data and a reinterpretation of previous models for tetrameric gene regulators derived from partial structural data.
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Affiliation(s)
- Duo Lu
- Division of Molecular Biosciences, Centre for Structural Biology, Imperial College, London, United Kingdom
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Bordi C, Lamy MC, Ventre I, Termine E, Hachani A, Fillet S, Roche B, Bleves S, Méjean V, Lazdunski A, Filloux A. Regulatory RNAs and the HptB/RetS signalling pathways fine-tune Pseudomonas aeruginosa pathogenesis. Mol Microbiol 2010; 76:1427-43. [PMID: 20398205 PMCID: PMC2904497 DOI: 10.1111/j.1365-2958.2010.07146.x] [Citation(s) in RCA: 116] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Bacterial pathogenesis often depends on regulatory networks, two-component systems and small RNAs (sRNAs). In Pseudomonas aeruginosa, the RetS sensor pathway downregulates expression of two sRNAs, rsmY and rsmZ. Consequently, biofilm and the Type Six Secretion System (T6SS) are repressed, whereas the Type III Secretion System (T3SS) is activated. We show that the HptB signalling pathway controls biofilm and T3SS, and fine-tunes P. aeruginosa pathogenesis. We demonstrate that RetS and HptB intersect at the GacA response regulator, which directly controls sRNAs production. Importantly, RetS controls both sRNAs, whereas HptB exclusively regulates rsmY expression. We reveal that HptB signalling is a complex regulatory cascade. This cascade involves a response regulator, with an output domain belonging to the phosphatase 2C family, and likely an anti-anti-σ factor. This reveals that the initial input in the Gac system comes from several signalling pathways, and the final output is adjusted by a differential control on rsmY and rsmZ. This is exemplified by the RetS-dependent but HptB-independent control on T6SS. We also demonstrate a redundant action of the two sRNAs on T3SS gene expression, while the impact on pel gene expression is additive. These features underpin a novel mechanism in the fine-tuned regulation of gene expression.
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Affiliation(s)
- Christophe Bordi
- Laboratoire d'Ingénierie des Systèmes Macromoléculaires, UPR9027, CNRS-IMM, Université de la Méditerranée, 31 Chemin Joseph Aiguier, 13402 Marseille cedex 20, France
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Terán W, Felipe A, Fillet S, Guazzaroni ME, Krell T, Ruiz R, Ramos JL, Gallegos MT. Complexity in efflux pump control: cross-regulation by the paralogues TtgV and TtgT. Mol Microbiol 2007; 66:1416-28. [DOI: 10.1111/j.1365-2958.2007.06004.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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