Soil bacteria producing antimicrobial compounds
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ABSTRACT:
PROVIDER: PRJNA554317 | ENA |
REPOSITORIES: ENA
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Project description:Cationic antimicrobial peptides (CAPs) are promising novel alternatives to conventional antibacterial agents, but the overlap in resistance mechanisms between small-molecule antibiotics and CAPs is unknown. Does evolution of antibiotic resistance decrease (cross-resistance) or increase (collateral sensitivity) susceptibility to CAPs? We systematically addressed this issue by studying the susceptibilities of a comprehensive set of antibiotic resistant Escherichia coli strains towards 24 antimicrobial peptides. Strikingly, antibiotic resistant bacteria frequently showed collateral sensitivity to CAPs, while cross-resistance was relatively rare. We identified clinically relevant multidrug resistance mutations that simultaneously elevate susceptibility to certain CAPs. Transcriptome and chemogenomic analysis revealed that such mutations frequently alter the lipopolysaccharide composition of the outer cell membrane and thereby increase the killing efficiency of membrane-interacting antimicrobial peptides. Furthermore, we identified CAP-antibiotic combinations that rescue the activity of existing antibiotics and slow down the evolution of resistance to antibiotics. Our work provides a proof of principle for the development of peptide based antibiotic adjuvants that enhance antibiotic action and block evolution of resistance.
2018-03-29 | GSE96706 | GEO
Project description:Biogenic amine-producing bacteria are responsible for the production of basic nitrogenous compounds, such as histamine, cadaverine, tyramine and putrescine, after foods spoil due to microorganisms. In the present work, we applied a shotgun proteomics approach to quickly and easily characterize 15 different foodborne strains of biogenic amine-producing bacteria. A total of 10673 peptide spectrum matches (PSMs) belonging to 4081 nonredundant peptides and corresponding to 1811 annotated proteins were identified. With the results, relevant functional pathways were determined and the strains were differentiated into different Euclidean hierarchical clusters. Moreover, a predicted protein‒protein interaction network of biogenic amine foodborne strains was created. The whole confidence network contains 260 nodes and 1973 interactions. Most of the identified proteins were related to pathways and networks of energy, putrescine metabolism and host‒virus interaction. In addition, a total of 556 nonredundant peptides were identified as virulence factors, and most of these peptides corresponded to functions such as toxins, antimicrobial compound production, antimicrobial resistance, additional resistances and tolerances, host colonization and immune evasion, ABC transporters, phage proteins, and alternative virulence factors and proteins involved in horizontal transfer. Potential species-specific peptide biomarkers were screened. Thus, 77 species-specific peptide biomarkers belonging to 64 different proteins were proposed to identify 10 species (Enterobacter aerogenes, Enterobacter cloacae, Hafnia alvei, Klebsiella oxytoca, Morganella morganii, Proteus mirabilis, Proteus penneri, Proteus vulgaris, Raoutella planticola, Stenotrophomonas maltophilia). All of these results constitute the first major dataset of peptides and proteins of seafood biogenic amine-producing strains. This repository may be useful for further studies, for the development of new therapeutic treatments for food intoxication and for tracking microbial sources in foodstuffs.
2023-07-20 | PXD039320 | Pride
Project description:We report the application of a high-throughput technique, RNA-seq, to study the transcriptomic response of P. putida DOT-T1E in the presence of antibiotics with different mechanisms of action with the aim to study in more detail the defense mechanisms that bacteria use to resist against toxic compounds. We find that P. putida DOT-T1E responde in a different way against each antimicrobial compound, what clearly shows that bacteria defense in different ways depending on the targets that compounds uses to attack. Our work is the first global transcriptomic analysis done in P. putida DOT-T1E in the presence of a considerable range of antibiotics.
2015-01-20 | GSE56749 | GEO
Project description:We report the application of a high-throughput technique, RNA-seq, to study the transcriptomic response of P. putida DOT-T1E in the presence of antibiotics with different mechanisms of action with the aim to study in more detail the defense mechanisms that bacteria use to resist against toxic compounds. We find that P. putida DOT-T1E responde in a different way against each antimicrobial compound, what clearly shows that bacteria defense in different ways depending on the targets that compounds uses to attack. Our work is the first global transcriptomic analysis done in P. putida DOT-T1E in the presence of a considerable range of antibiotics. P. putida DOT-T1E mRNA profiles in the presence of control condition (LB) and 8 different antibiotics (ampicillin, chloramphenicol, kanamycin, ciprofloxacin, tetracycline, spectinomycin, gentamicin and rifampicin)
2015-01-20 | E-GEOD-56749 | biostudies-arrayexpress
Project description:The balance between tolerogenic and inflammatory responses determines immune homeostasis in the gut. Dysbiosis and a defective host defense against invading intestinal bacteria can shift this balance via bacterial-derived metabolites and trigger chronic inflammation. We show that the short chain fatty acid butyrate modulates monocyte to macrophage differentiation by promoting antimicrobial effector functions. The presence of butyrate modulates antimicrobial activity via a shift in macrophage metabolism and reduction in mTOR activity. This mechanism is furthermore dependent on the inhibitory function of butyrate on histone deacetylase 3 (HDAC3) driving transcription of a set of antimicrobial peptides including calprotectin. The increased antimicrobial activity against several bacterial species is not associated with increased production of conventional cytokines. Butyrate imprints antimicrobial activity of intestinal macrophages in vivo. Our data suggest that commensal bacteria derived butyrate stabilize gut homeostasis by promoting antimicrobial host defense pathways in monocytes that differentiate into intestinal macrophages.
2019-01-30 | GSE111049 | GEO
Project description:we used a label free quantitative proteomics approach, to describe the changes of protein expressions in C. reinhardtii and cobalamin producing bacteria Sinorhizobium meliloti 1021, in their interactions under different temperatures.
2022-05-25 | PXD032709 |
Project description:Herein, we used C. acnes as a model to elucidate the antimicrobial machinery of the TH17 subset. We generated C. acnes-specific antimicrobial TH17 clones (AMTH17) with varying antimicrobial activity against C. acnes, to enable us to study mechanisms by which TH17 cells kill bacteria. We show that C. acnes-induced AMTH17 clones represent a subset of CD4+ TEM and TEMRA cells. RNA-seq analysis of AMTH17 indicate transcripts encoding antimicrobial molecules such as GNLY, GZMB, PRF1 and histone H2B, whose expression correlates with killing activity. Additionally, we validated that AMTH17-mediated killing is a general mechanism that can target C. acnes and other bacterial species. Scanning electron microscopy reveal that AMTH17s can release T cell extracellular traps composed of lysine and arginine-rich histones such as H2B and H4 that entangle C. acnes. This study identifies a functionally distinct subpopulation of TH17 cells with an ability to secrete antimicrobial proteins and form extracellular T cell traps to capture and kill bacteria.
2021-12-01 | GSE144852 | GEO
Project description:Dermal fibroblasts (dFB) resist infection by locally differentiating into adipocytes and producing the antimicrobial peptide cathelicidin in response to S. aureus. We found that neonatal dFB were highly adipogenic whereas this adipogenic function was lost during adulthood. To better understand the molecular nature of the change in antimicrobial and adipogenic function of dFB, we profiled the transcriptomes of primary dFB isolated at different ages by RNA-seq. RNA-seq identified the pro-adipogenic to pro-fibrotic gene signature switch in dFB during aging, and identified TGF-beta as the top up-regulated pathway that was activated in 2M dFB compared to neonatal P1 dFB.
2018-10-18 | GSE121460 | GEO
Project description:To survive during colonization or infection of the human body, microorganisms must defeat antimicrobial peptides, which represent a key component of innate host defense in phagocytes and on epithelia. However, is not known how the clinically important group of Gram-positive bacteria sense antimicrobial peptides to coordinate a directed defensive response. By determining the genome-wide gene regulatory response to human beta defensin 3 in the nosocomial pathogen Staphylococcus epidermidis, we discovered an antimicrobial peptide sensor system that controls major specific resistance mechanisms to antimicrobial peptides and is unrelated to the Gram-negative PhoP/PhoQ system. Keywords: Wild type control vs treated vs mutant
2008-02-26 | GSE7163 | GEO
Project description:RNA interference (RNAi) is a phylogenetically widespread gene silencing process triggered by doublestranded RNA (dsRNA). In plants and C. elegans, two distinct populations of small RNAs have been proposed to participate in RNAi : "Primary siRNAs" (derived from Dicer nuclease-mediated cleavage of the original trigger) and "Secondary siRNAs" (additional small RNAs whose synthesis requires an RNA-directed RNA polymerase [RdRP]). Analyzing small RNAs associated with ongoing RNAi in C. elegans, we found secondary siRNAs to comprise the vast majority. The bulk of secondary siRNAs exhibited structure and sequence indicative of a biosynthetic mode where each molecule derives from an independent de novo initiation by RdRP. Analysis of endogenous small RNAs indicated that a fraction derive from a biosynthetic mechanism that is similar to that of secondary siRNAs formed during RNAi, suggesting that small antisense transcripts derived from cellular mRNAs by RdRP activity may have key roles in cellular regulation. Keywords: C. elegans small RNA sequences from wild type animals fed on sel-1 dsRNA producing bacteria C. elegans small RNA sequences from wild type animals fed on sel-1 dsRNA producing bacteria
2006-11-17 | E-GEOD-6282 | biostudies-arrayexpress