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- Cao, LY, et al.
(författare)
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Deciphering Molecular Mechanism Underlying Self-Flocculation of Zymomonas mobilis for Robust Production
- 2022
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Ingår i: Applied and environmental microbiology. - : American Society for Microbiology. - 1098-5336 .- 0099-2240. ; 88:9, s. e0239821-
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Tidskriftsartikel (refereegranskat)abstract
- Stress tolerance is a prerequisite for microbial cell factories to be robust in production, particularly for biorefinery of lignocellulosic biomass to produce biofuels, bioenergy, and bio-based chemicals for sustainable socioeconomic development, since various inhibitors are released during the pretreatment to destroy the recalcitrant lignin-carbohydrate complex for sugar production through enzymatic hydrolysis of the cellulose component, and their detoxification is too costly for producing bulk commodities. Although tolerance to individual stress has been intensively studied, the progress seems less significant since microbial cells are inevitably suffering from multiple stresses simultaneously under production conditions.
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| 19. |
- Choudhary, MI, et al.
(författare)
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Innovative Strategies to Overcome Antimicrobial Resistance and Tolerance
- 2023
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Ingår i: Microorganisms. - : MDPI AG. - 2076-2607. ; 11:1
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Tidskriftsartikel (refereegranskat)abstract
- Antimicrobial resistance and tolerance are natural phenomena that arose due to evolutionary adaptation of microorganisms against various xenobiotic agents. These adaptation mechanisms make the current treatment options challenging as it is increasingly difficult to treat a broad range of infections, associated biofilm formation, intracellular and host adapted microbes, as well as persister cells and microbes in protected niches. Therefore, novel strategies are needed to identify the most promising drug targets to overcome the existing hurdles in the treatment of infectious diseases. Furthermore, discovery of novel drug candidates is also much needed, as few novel antimicrobial drugs have been introduced in the last two decades. In this review, we focus on the strategies that may help in the development of innovative small molecules which can interfere with microbial resistance mechanisms. We also highlight the recent advances in optimization of growth media which mimic host conditions and genome scale molecular analyses of microbial response against antimicrobial agents. Furthermore, we discuss the identification of antibiofilm molecules and their mechanisms of action in the light of the distinct physiology and metabolism of biofilm cells. This review thus provides the most recent advances in host mimicking growth media for effective drug discovery and development of antimicrobial and antibiofilm agents.
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- Dinesh, SD, et al.
(författare)
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European-wide distribution of Pseudomonas aeruginosa clone C
- 2003
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Ingår i: Clinical microbiology and infection : the official publication of the European Society of Clinical Microbiology and Infectious Diseases. - : Elsevier BV. - 1198-743X. ; 9:12, s. 1228-1233
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Tidskriftsartikel (refereegranskat)
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- Gaviria-Cantin, T, et al.
(författare)
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Gre Factors Are Required for Biofilm Formation in Salmonella enterica Serovar Typhimurium by Targeting Transcription of the csgD Gene
- 2022
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Ingår i: Microorganisms. - : MDPI AG. - 2076-2607. ; 10:10
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Tidskriftsartikel (refereegranskat)abstract
- Rdar biofilm formation of Salmonella typhimurium and Escherichia coli is a common ancient multicellular behavior relevant in cell–cell and inter-organism interactions equally, as in interaction with biotic and abiotic surfaces. With the expression of the characteristic extracellular matrix components amyloid curli fimbriae and the exopolysaccharide cellulose, the central hub for the delicate regulation of rdar morphotype expression is the orphan transcriptional regulator CsgD. Gre factors are ubiquitously interacting with RNA polymerase to selectively overcome transcriptional pausing. In this work, we found that GreA/GreB are required for expression of the csgD operon and consequently the rdar morphotype. The ability of the Gre factors to suppress transcriptional pausing and the 147 bp 5′-UTR of csgD are required for the stimulatory effect of the Gre factors on csgD expression. These novel mechanism(s) of regulation for the csgD operon might be relevant under specific stress conditions.
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- Jonas, K, et al.
(författare)
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Regulation of c-di-GMP metabolism in biofilms
- 2009
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Ingår i: Future microbiology. - : Future Medicine Ltd. - 1746-0921 .- 1746-0913. ; 4:3, s. 341-358
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Tidskriftsartikel (refereegranskat)abstract
- Cyclic (5´ to 3´)-diguanosine monophosphate (c-di-GMP) is a small molecule that regulates the transition between the sessile and motile lifestyle, an integrative part of biofilm formation and other multicellular behavior, in many bacteria. The recognition of c-di-GMP as a novel secondary messenger soon raised the question about the specificity of the signaling system, as individual bacterial genomes frequently encode numerous c-di-GMP metabolizing proteins. Recent work has demonstrated that several global regulators concertedly modify the expression of selected panels of c-di-GMP metabolizing proteins, which act on targets with physiological functions. Within complex feed-forward arrangements, the global regulators commonly combine the control of c-di-GMP metabolism with the direct regulation of proteins with functions in motility or biofilm formation, leading to precise and fine-tuned output responses that determine bacterial behavior. c-di-GMP metabolizing proteins are also controlled at the post-translational level by mechanisms including phosphorylation, localization, protein–protein interactions or protein stability. A detailed understanding of such complex regulatory mechanisms will not only help to explain the specificity in c-di-GMP signaling systems, but will also be necessary to understand the high phenotypic diversity within bacterial biofilms at the single cell level.
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- Kamal, SM, et al.
(författare)
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Horizontal Transmission of Stress Resistance Genes Shape the Ecology of Beta- and Gamma-Proteobacteria
- 2021
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Ingår i: Frontiers in microbiology. - : Frontiers Media SA. - 1664-302X. ; 12, s. 696522-
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Tidskriftsartikel (refereegranskat)abstract
- The transmissible locus of stress tolerance (tLST) is found mainly in beta- and gamma-Proteobacteria and confers tolerance to elevated temperature, pressure, and chlorine. This genomic island, previously referred to as transmissible locus of protein quality control or locus of heat resistance likely originates from an environmental bacterium thriving in extreme habitats, but has been widely transmitted by lateral gene transfer. Although highly conserved, the gene content on the island is subject to evolution and gene products such as small heat shock proteins are present in several functionally distinct sequence variants. A number of these genes are xenologs of core genome genes with the gene products to widen the substrate spectrum and to be highly (complementary) expressed thus their functionality to become dominant over core genome genes. In this review, we will present current knowledge of the function of core tLST genes and discuss current knowledge on selection and counter-selection processes that favor maintenance of the tLST island, with frequent acquisition of gene products involved in cyclic di-GMP signaling, in different habitats from the environment to animals and plants, processed animal and plant products, man-made environments, and subsequently humans.
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- Katikaridis, P, et al.
(författare)
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ClpG Provides Increased Heat Resistance by Acting as Superior Disaggregase
- 2019
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Ingår i: Biomolecules. - : MDPI AG. - 2218-273X. ; 9:12
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Tidskriftsartikel (refereegranskat)abstract
- Elevation of temperature within and above the physiological limit causes the unfolding and aggregation of cellular proteins, which can ultimately lead to cell death. Bacteria are therefore equipped with Hsp100 disaggregation machines that revert the aggregation process and reactivate proteins otherwise lost by aggregation. In Gram-negative bacteria, two disaggregation systems have been described: the widespread ClpB disaggregase, which requires cooperation with an Hsp70 chaperone, and the standalone ClpG disaggregase. ClpG co-exists with ClpB in selected bacteria and provides superior heat resistance. Here, we compared the activities of both disaggregases towards diverse model substrates aggregated in vitro and in vivo at different temperatures. We show that ClpG exhibits robust activity towards all disordered aggregates, whereas ClpB acts poorly on the protein aggregates formed at very high temperatures. Extreme temperatures are expected not only to cause extended protein unfolding, but also to result in an accelerated formation of protein aggregates with potentially altered chemical and physical parameters, including increased stability. We show that ClpG exerts higher threading forces as compared to ClpB, likely enabling ClpG to process “tight” aggregates formed during severe heat stress. This defines ClpG as a more powerful disaggregase and mechanistically explains how ClpG provides increased heat resistance.
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