Browse
Submit Data
Databases
API
Help

Dataset Information

0 Views

0 Connections

0 Citations

0 Reanalyses

0 Downloads

Omics score: 0

Acinetobacter baumannii Ci79 WT and TrxA mutant outer membrane vesicle proteins

ABSTRACT: To investigate whether OMVs can be modulated by TrxA, we isolated OMVs from wild type (WT) and TrxA-deficient (ΔtrxA) A. baumannii clinical isolate Ci79, and carried out a functional and proteomic comparison.

INSTRUMENT(S): LTQ Orbitrap Elite

ORGANISM(S): Acinetobacter Baumannii Ci79

TISSUE(S): Vesicle Budding From Membrane

DISEASE(S): Disease Free

SUBMITTER: Jieh-Juen Yu

LAB HEAD: Bernard Arulanandam

PROVIDER: PXD027181 | Pride | 2022-08-12

REPOSITORIES: Pride

ACCESS DATA

Json Xml

Dataset's files

Source:

			Action	DRS
	MUT1.raw	Raw
	MUT2.raw	Raw
	MUT3.raw	Raw
	WT1.raw	Raw
	WT2.raw	Raw

Items per page:

1 - 5 of 43

Publications

Thioredoxin-mediated alteration of protein content and cytotoxicity of Acinetobacter baumannii outer membrane vesicles.

Shrihari Swathi S May Holly C HC Yu Jieh-Juen JJ Papp Sara B SB Chambers James P JP Guentzel M Neal MN Arulanandam Bernard P BP

Experimental biology and medicine (Maywood, N.J.) 20211029 3

Acinetobacter baumannii is a Gram-negative bacterium responsible for many hospital-acquired infections including ventilator-associated pneumonia and sepsis. We have previously identified A. baumannii thioredoxin A protein (TrxA) as a virulence factor with a multitude of functions including reduction of protein disulfides. TrxA plays an important role in resistance to oxidative stress facilitating host immune evasion in part by alteration of type IV pili and cell surface hydrophobic ...[more]

PMID: 34713732

Similar Datasets

short RNA-Seq of Pseudomonas aeruginosa outer membrane vesicles (OMVs) and whole cells

Project description:Characterization of the sRNA content of P. aeruginosa OMVs compared to whole cells. Result: OMVs contain differentially packaged sRNAs. Whole cell PA14 and OMVs from 3 separate preparations.

2016-05-13 | E-GEOD-71598 | biostudies-arrayexpress

Outer membrane vesicle of Pseudomonas aerugionsa

Project description:Objectives: This study aimed to investigate the microbiological characteristics of outer membrane vesicles (OMVs) derived from Pseudomonas aeruginosa (P. aeruginosa) to understand their mechanisms of inhibition of Acinetobacter baumannii (A. baumannii) in vitro. Methods: We assessed the inhibitory effects of P. aeruginosa on A. baumannii using a modified cross-streak assay. Subsequently, OMVs were extracted from P. aeruginosa strains using high-speed centrifugation, tangential flow filtration, ultrafiltration, and ultracentrifugation. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE), transmission electron microscopy (TEM), and nanoparticle tracking assays (NTAs) were performed to confirm the presence of the extracted OMVs. P. aeruginosa-derived OMVs’ inhibitory activity against A. baumannii was tested using a modified time-kill assay. The proteomic analysis of OMVs revealed potential antibacterial protein clusters with diverse functions. Results: P. aeruginosa 022 (PA022) demonstrated inhibition of A. baumannii in the cross-streak assay. The protein levels of OMVs for PA022 and P. aeruginosa ATCC 27853 (PA ATCC 27853) were 1665 and 428.6 μg/mL, respectively. Additionally, PA 022 and PA ATCC 27853 exhibited variable patterns and sizes in the SDS-PAGE, TEM, and NTA. Furthermore, the growth inhibitory effect of PA022 OMVs on A. baumannii was evaluated using a modified time-kill assay. The proteomic analysis of OMVs revealed potential antibacterial protein clusters in PA 022 associated with virulence, motility, and post-translational modifications. Conclusion: Our study contributes to the understanding of P. aeruginosa OMVs characteristics and their inhibitory effect against A. baumannii, providing insights into the development of alternative therapeutic approaches against multi-drug resistance.

2023-09-18 | PXD045094 | Pride

Characterizing Acinetobacter baumannii desiccation tolerance.

Project description:Desiccation tolerance has been implicated as an important characteristic that potentiates the spread of the bacterial pathogen Acinetobacter baumannii through hospitals on dry surfaces. Despite the potential importance of this stress response, scarce information is available describing the underlying mechanisms of A. baumannii desiccation tolerance. Here we characterize the factors influencing desiccation survival of A. baumannii. At the macroscale level, we find that desiccation tolerance is influenced by cell density, growth phase, and desiccation medium. Our transcriptome analysis indicates that desiccation represents a unique state for A. baumannii compared to commonly studied growth conditions and strongly influences pathways responsible for proteostasis. Remarkably, we find that an increase in total cellular protein aggregates, which is often considered deleterious, correlates positively with the ability of A. baumannii to survive desiccation. We show that artificially inducing protein aggregate formation increases desiccation survival, and more importantly, that proteins incorporated into cellular aggregates can retain activity. Our results suggest that protein aggregates may promote desiccation tolerance in A. baumannii through preserving and protecting proteins from damage during desiccation until rehydration occurs.

2018-10-27 | GSE111383 | GEO

Outer membrane vesicle proteome of Aggregatibacter actinomycetemcomitans serotype e strain 173

Project description:Aggregatibacter actinomycetemcomitans is an oral and systemic pathogen associated with aggressive forms of periodontitis, and with endocarditis. Outer membrane vesicles (OMVs) released by this species have been demonstrated to deliver effector proteins such as cytolethal distending toxin (CDT) and leukotoxin (LtxA) into human host cells, and to act as triggers of innate immunity upon carriage of NOD1- and NOD2-active pathogen-associated molecular patterns (PAMPs). To improve our understanding of the pathogenicity-associated functions that A. actinomycetemcomitans exports via OMVs, we have used liquid chromatography-tandem mass spectrometry (LC-MS/MS) to characterize the OMV-associated proteome of a rough-colony type clinical isolate, strain 173 (serotype e). This yielded identification of 151 proteins overlapping in three out of four independent experiments, using density gradient-purified OMVs. Further to confirming the vesicle-associated release of LtxA, and of several proteins earlier demonstrated to act as immunoreactive antigens in the human host, we identified numerous additional putative virulence-related proteins in the A. actinomycetemcomitans OMV proteome, including proteins involved in immune evasion, drug targeting, and iron/nutrient acquisition. In summary our findings are consistent with an OMV-associated proteome that exhibits several offensive and defensive functions, and they provide a comprehensive basis to further disclose roles of A. actinomycetemcomitans OMVs in periodontal and systemic disease.

2015-09-21 | PXD002509 | Pride

Proteomic analysis of outer membrane vesicle isolation methods with an Escherichia coli tolA mutant using LC MSMS

Project description:Outer membrane vesicles (OMVs) produced by Gram-negative bacteria are mediators of cell survival and pathogenesis by facilitating nutrient transport, virulence factor dissemination, and resistance to antimicrobials. Studies of OMV properties often focus on hypervesiculating Escherichia coli mutants that have increased OMV production when compared to their corresponding wild-type (WT) strains. Currently, two conventional techniques, ultracentrifugation (UC) and ultradiafiltration (UF), are used interchangeably to isolate OMVs, however, there is concern that each technique may inadvertently alter the properties of isolated OMVs during study. To address this concern, we compared two OMV isolation methods, UC and UF, with respect to final OMV quantities, size distributions, and morphologies using a hypervesiculating Escherichia coli K-12 ∆tolA mutant. Cryo-transmission electron microscopy (cryo-TEM) visualization of isolated OMVs revealed distinct morphological differences between wild-type and ∆tolA OMVs, where ∆tolA OMVs isolated by either UC or UF method possessed a greater proportion of OMVs with two or more membranes (39.6-42.4%). Proteomic OMV analysis of WT and ∆tolA OMVs confirmed that ∆tolA enhances inner plasma membrane carryover in multi-lamellar OMVs. This study demonstrates that UC and UF are useful techniques for OMV isolation, where UF may be preferable due to faster isolation, higher OMV yields and enrichment of smaller sized vesicles.

2021-09-09 | PXD022786 | Pride

RNA-seq of Acinetobacter baumannii ATCC 17978 Lab-WT: under blue light

Project description:Comparison for gene expression of Acinetobacter baumannii Lab-WT under blue light irradiation

2022-01-31 | GSE195643 | GEO

Generation of synthetic Acinetobacter baumannii specific nanobodies

Project description:The bacterial pathogen, Acinetobacter baumannii, is a leading cause of drug-resistant infections. Here, we investigated the potential of developing nanobodies that specifically recognize A. baumannii over other Gram-negative bacteria. Through generation and panning of a synthetic nanobody library, we identified several potential lead candidates. We demonstrate how incorporation of next generation sequencing analysis can aid in selection of lead candidates for further characterization. Using monoclonal phage display, we validated the binding of several lead nanobodies to A. baumannii. Subsequent purification and biochemical characterization revealed one particularly robust nanobody that broadly and specifically bound A. baumannii compared to other common drug resistant pathogens. These findings support the potentially for nanobodies to selectively target A. baumannii and the identification of lead candidates for possible future diagnostic and therapeutic development.

2023-06-21 | GSE202972 | GEO

Tn-seq of desiccated Acinetobacter baumannii

Project description:A major reservoir for spread of the emerging pathogen Acinetobacter baumannii is hopsital surfaces, where bacteria persist in a desiccated state. To identify gene products influencing desiccation survival, a transposon sequencing (Tn-seq) screen was performed. Using this approach, we identified genes both positively and negatively impacting the desiccation tolerance of A. baumannii.

2022-03-09 | GSE198004 | GEO

Proteomics of Outermembrane Vesicles (OMV) from Acinetobacter baumannii DS002

Project description:Outer membrane vesicles from A. baumannii DS002 were isolated using Diafilteration and Ultracentrifugation. The proteins of OMVs were separated on a 12.5% SDS-PAGE gel. The protein bands were excised and in-gel digetion was carried out using trypsin. The resultant peptides were analysed on LC-ESI-MS/MS. The proteins were identified with the help of Proteome Discoverer software.

2022-03-15 | PXD026751 | Pride

The response to desiccation in Acinetobacter baumannii

Project description:The long-term resistance to desiccation on abiotic surfaces is a key determinant of the adaptive success of Acinetobacter baumannii as a healthcare-associated bacterial pathogen. Here, the cellular and molecular mechanisms enabling A. baumannii to resist desiccation and persist on abiotic surfaces were investigated. Experiments were set up to mimic the A. baumannii response to air-drying that would occur when bacterial cells contaminate fomites in hospitals. Resistance to desiccation and transition to the “viable but nonculturable” (VBNC) state were determined in the laboratory-adapted strain ATCC 19606T and the epidemic strain ACICU. Culturability, membrane integrity, metabolic activity, virulence, and gene expression profile were compared between the two strains at different stages of desiccation. Upon desiccation, ATCC 19606T and ACICU cells lose culturability and membrane integrity, lower their metabolism, and enter the VBNC state. However, desiccated A. baumannii cells fully recover culturability and virulence in an insect infection model following rehydration in physiological buffers or human biological fluids. Transcriptome and chemical analyses of A. baumannii cells during desiccation unveiled the production of protective metabolites (L-cysteine and L-glutamate) and decreased energetic metabolism consequent to activation of the glyoxylate shunt (GS) pathway, as confirmed by reduced resuscitation efficiency of aceA mutants, lacking the key enzyme of the GS pathway. VBNC cell formation and extensive metabolic reprogramming provide a biological basis for the response of A. baumannii to desiccation, with implications on environmental control measures aimed at preventing the transmission of A. baumannii infection in hospitals.

2024-09-23 | GSE249021 | GEO