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61 results for “outer membrane”
Text-fig. 47. Synchrotron radiation X-ray tomographic microscopy (SRXTM) images of "One-seeded fruit sp. 1"; Catefica locality, Portugal. a, b) Lateral view of fruits showing slightly sinuous ventral margin and the curved stalk; c, d) Longitudinal sections perpendicular to each other through the median part of fruit and its single seed (c, orthoslice yz0652, d, xz0739) showing the bitegmic seed closely adhering to the fruit wall (fw); the several cell layer thick outer integument (oi) and the membranous inner integument (ii); note the vascular bundle (vb) branching into a dorsal and lateral bundle near the base of the fruit; e) Transverse section (orthoslice xy0600) showing fruit wall (fw) and outer (oi) and inner (ii) integuments of the seed; f) Longitudinal section (orthoslice yz0871) through the micropylar region showing micropyle (mi) formed from membranous inner integument (ii). Specimens, Catefica 49-S174927 (a), Catefica 49-S174923 (b, f), Catefica 49-S174769 (c–e). Scale bars = 300 Μm (a–d), 100 Μm (e, f). in The Early Cretaceous Mesofossil Flora Of Catefica, Portugal: Angiosperms
Text-fig. 47. Synchrotron radiation X-ray tomographic microscopy (SRXTM) images of "One-seeded fruit sp. 1"; Catefica locality, Portugal. a, b) Lateral view of fruits showing slightly sinuous ventral margin and the curved stalk; c, d) Longitudinal sections perpendicular to each other through the median part of fruit and its single seed (c, orthoslice yz0652, d, xz0739) showing the bitegmic seed closely adhering to the fruit wall (fw); the several cell layer thick outer integument (oi) and the membranous inner integument (ii); note the vascular bundle (vb) branching into a dorsal and lateral bundle near the base of the fruit; e) Transverse section (orthoslice xy0600) showing fruit wall (fw) and outer (oi) and inner (ii) integuments of the seed; f) Longitudinal section (orthoslice yz0871) through the micropylar region showing micropyle (mi) formed from membranous inner integument (ii). Specimens, Catefica 49-S174927 (a), Catefica 49-S174923 (b, f), Catefica 49-S174769 (c–e). Scale bars = 300 Μm (a–d), 100 Μm (e, f).
An ancestral dual function of OmpM as outer membrane tether and nutrient uptake channel in diderm Firmicutes
<p>Trajectories, run input files, and custom analysis script for simulations described in the article:<strong> An ancestral dual function of OmpM as outer membrane tether and nutrient uptake channel in diderm Firmicutes</strong> (Silale <em>et al, </em>2023). </p> <p>Preprint: https://doi.org/10.1101/2023.08.14.552755 </p>
Role of internal loop dynamics in antibiotic permeability of outer membrane porins
<p>Representative structures for Markov State models for wild type and mutants of OmpF "Coupling of internal loop dynamics and antibiotic permeation in outer membrane porins"</p>
Simulation Input Data for "Molecular simulation of lignin-related aromatic compound permeation through Gram-negative bacterial outer membranes"
<p>This is the reduced data behind an upcoming manuscript investigating permeability across the outer membranes of Gram-negative bacteria. The data is taken directly from the directory structure that contains both the simulation and analysis, with excluded trajectory files and intermediate products to fit within the zenodo upload limit. The tar command used to generate this tarball was:</p> <pre><code class="language-bash">tar --exclude="*BAK" --exclude="*dcd" --exclude="*xsc" --exclude="*vel" --exclude="*coor" --exclude="*csv" --exclude="*old" --exclude="*log" --exclude="*state" --exclude="*watpos/*npz" --exclude="*new*png" --exclude="*frame*png" --exclude="*ppm" --exclude="*mp4" --exclude="*bayesdata*npy" --exclude="*run.npy" -zcvf OM.tgz OuterMembrane</code></pre> <p>Within the OuterMembrane directory, there are 3 primary subdirectories.</p> <ul> <li><strong>Build </strong>contains the scripts and files to build the simulation systems, including the CHARMM-GUI output</li> <li><strong>Equilibrium</strong> contains the equilibrium simulation inputs and the analysis scripts (subdirectory <strong>Analysis</strong>)</li> <li><strong>REUS2</strong>, which has the replica exchange inputs and essential output. It also contains an <strong>Analysis</strong> subdirectory that carries out the analysis within the text.</li> </ul>
SN2N's 3D dataset of outer mitochondrial membrane network of live COS-7 cells labeled with Tom20-mCherry on SD-SIM sysytem.
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Data from: Antibiotic uptake across gram-negative outer membranes: better predictions towards better antibiotics
<p>Crossing the gram-negative bacterial membrane poses a major barrier to antibiotic development, as many small molecules that can biochemically inhibit key bacterial processes are rendered microbiologically ineffective by their poor cellular uptake. The outer membrane is the major permeability barrier for many drug-like molecules, and the chemical properties that enable efficient uptake into mammalian cells fail to predict bacterial uptake. We have developed a computational method for accurate prospective prediction of outer-membrane uptake of drug-like molecules, which we combine with a new medium-throughput experimental assay of outer membrane vesicle swelling. Parallel molecular dynamics simulations of compound uptake through E. coli OmpF are used to successfully and quantitatively predict experimental permeabilities measured via either outer membrane swelling or via prior liposome swelling measurements. These simulations are analyzed using an inhomogeneous solubility-diffusion model to yield predictions of permeability. For most polar molecules we test, outer membrane permeability also correlates well with whole-cell uptake. The ability to accurately predict and measure outer-membrane uptake of a wide variety of small molecules will enable simpler determination of which molecular scaffolds and which derivatives are most promising prior to extensive chemical synthesis. It will also assist in formulating a more systematic understanding of the chemical determinants of outer-membrane permeability.</p>
PqiC assembles an octameric toroid that stabilises the outer membrane interaction of a putative inter-membrane transport system.
<p>Neutron reflectometry data and custom models used to analyze this data for the article:</p> <p>"PqiC assembles an octameric toroid that stabilises the outer membrane interaction of a putative inter-membrane transport system."</p> <p>The NR data files and the custom models used to fit these using the RasCAL software are provided. </p>
Data from: Antibiotic uptake across gram-negative outer membranes: better predictions towards better antibiotics
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Data from: Kin discrimination and outer membrane exchange in Myxococcus xanthus: a comparative analysis among natural isolates
Genetically similar cells of the soil bacterium Myxococcus xanthus cooperate at multiple social behaviours, including motility and multicellular development. Another social interaction in this species is outer-membrane exchange (OME), a behaviour of unknown primary benefit in which cells displaying closely related variants of the outer-membrane protein TraA transiently fuse and exchange membrane contents. Functionally incompatible TraA variants do not mediate OME, which led to the proposal that TraA incompatibilities determine patterns of intercellular cooperation in nature, but how this might occur remains unclear. Using natural isolates from a centimetre-scale patch of soil, we analyse patterns of TraA diversity and ask whether relatedness at TraA is causally related to patterns of kin discrimination in the form of both colony-merger incompatibilities (CMIs) and inter-strain antagonisms. A large proportion of predicted TraA functional diversity documented among global isolates is contained within the cm-scale population. We find evidence of balancing selection on the PA14-portion of TraA and extensive transfer of traA alleles across genomic backgrounds. CMIs are shown to be common among strains identical at TraA, suggesting that CMI kin discrimination is not generally caused by TraA dissimilarity. Finally, it has been proposed that inter-strain antagonisms might be caused by OME-mediated toxin transfer. However, we find that most strain pairs exhibiting strong antagonisms are predicted to be incapable of OME due to TraA dissimilarity. Overall, our results suggest that documented patterns of kin discrimination in a defined natural population of M. xanthus are not causally related to the degree of TraA relatedness among interactants.
Data for "Coordination of bacterial cell wall and outer membrane biosynthesis"
<p>Raw data used in the paper "Coordination of bacterial cell wall and outer membrane biosynthesis" by Katherine R. Hummels, Samuel P. Berry, Zhaoqi Li, Atsushi Taguchi, Joseph K. Min, Suzanne Walker, Debora S. Marks, and Thomas G. Bernhardt. These data were collected with the aim of understanding how the lipopolysaccharide biosynthetic enzyme LpxC is regulated in diverse gram-negative bacteria, particularly Pseudomonas aeruginosa. The dataset contains the following tarred directories:</p> <p><em><strong>Experimental data</strong></em></p> <ul> <li>Microscopy (microscopy.tar.gz)</li> <li>LC-MS/MS (lc-ms_ms.tar.gz)</li> </ul> <p><strong><em>Covariation analysis</em></strong></p> <ul> <li>Multiple sequence alignments (alignments.tar.gz)</li> <li>AlphaFold structures (alphafold.tar.gz)</li> <li>EVcomplex models and couplings (evcomplex.tar.gz)</li> <li>Phylogenetic trees (trees.tar.gz)</li> </ul> <p>For more detailed methods and file descriptions, please see README.md. Associated code for analysis can be found at https://github.com/samberry19/evcomplex-interaction-scoring.</p>
A novel mechanism that maintains outer membrane lipid asymmetry in Pseudomonas aeruginosa
<p>Newick file the PA2800 phylogenetic tree in "A novel mechanism that maintains outer membrane lipid asymmetry in Pseudomonas aeruginosa"</p>
Detoxified J5 Core Glycolipid/ Group B Meningococcal Outer Membrane Protein Vaccine for Gram-negative Bacterial Sepsis Administered With and Without Synthetic CPG Oligodeoxynucleotide 7909 Adjuvant
ClinicalTrials.gov study NCT01164514. IPD Sharing: Not stated. Countries: 1. Publications: 1.
Evaluation of the Cone Outer Segment Tips Line After Epiretinal Membrane Surgery
ClinicalTrials.gov study NCT01549249. IPD Sharing: Not stated. Countries: 1. Publications: 1.
Data from: Kin discrimination and outer membrane exchange in Myxococcus xanthus: a comparative analysis among natural isolates
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Data from: Phylogenomic analysis supports the ancestral presence of LPS-outer membranes in the Firmicutes
One of the major unanswered questions in evolutionary biology is when and how the transition between diderm (two membranes) and monoderm (one membrane) cell envelopes occurred in Bacteria. The Negativicutes and the Halanaerobiales belong to the classically monoderm Firmicutes, but possess outer membranes with lipopolysaccharide (LPS-OM). Here, we show that they form two phylogenetically distinct lineages, each close to different monoderm relatives. In contrast, their core LPS biosynthesis enzymes were inherited vertically, as in the majority of bacterial phyla. Finally, annotation of key OM systems in the Halanaerobiales and the Negativicutes shows a puzzling combination of monoderm and diderm features. Together, these results support the hypothesis that the LPS-OMs of Negativicutes and Halanaerobiales are remnants of an ancient diderm cell envelope that was present in the ancestor of the Firmicutes, and that the monoderm phenotype in this phylum is a derived character that arose multiple times independently through OM loss.
Data from: Evidence for amino acid snorkeling from a high-resolution, in vivo analysis of Fis1 tail anchor insertion at the mitochondrial outer membrane
Proteins localized to mitochondria by a carboxyl-terminal tail anchor (TA) play roles in apoptosis, mitochondrial dynamics, and mitochondrial protein import. To reveal characteristics of TAs that may be important for mitochondrial targeting, we focused our attention upon the TA of the Saccharomyces cerevisiae Fis1 protein. Specifically, we generated a library of Fis1p TA variants fused to the Gal4 transcription factor, then, using next-generation sequencing, revealed which Fis1p TA mutations inhibited membrane insertion and allowed Gal4p activity in the nucleus. Prompted by our global analysis, we subsequently analyzed the ability of individual Fis1p TA mutants to localize to mitochondria. Our findings suggest that the membrane-associated domain of the Fis1p TA may be bipartite in nature, and we encountered evidence that the positively charged patch at the carboxyl-terminus of Fis1p is required for both membrane insertion and organelle specificity. Furthermore, lengthening or shortening of the Fis1p TA by up to three amino acids did not inhibit mitochondrial targeting, arguing against a model in which TA length directs insertion of TAs to distinct organelles. Most importantly, positively charged residues were more acceptable at several positions within the membrane-associated domain of the Fis1p TA than negatively charged residues. These findings, emerging from the first high-resolution analysis of an organelle targeting sequence by deep mutational scanning, provide strong, in vivo evidence that lysine and arginine can "snorkel," or become stably incorporated within a lipid bilayer by placing terminal charges of their side chains at the membrane interface.
ArsR transcriptional regulator mediated attenuated mechanism by regulating self and outer membrane protein in Brucella
<p><span>The ArsR family transcriptional regulators are widely distributed in microorganisms, including in the important intracellular pathogen <i>Brucella</i>. ArsR proteins are implicated in numerous biological processes. However, the specific roles of ArsR family members in <i>Brucella</i> remain obscure. Here we show that ArsR3 (BSS2_RS07325) is required for <i>Brucella</i> survival both under stress <i>in vitro</i> conditions and in a murine infection model<i> in vivo</i>. ArsR3 autoregulate its own expression to maintain metal ion homeostasis to benefit bacterial survival. Moreover, ArsR3 also regulates the production of virulence factor outer membrane protein 25D (Omp25D) which is key for the survival of <i>Brucella</i> under stress conditions. Significantly, ArsR3 deletion strain attenuated in a murine infection model<i> in vivo</i>. Altogether, our findings reveal a unique mechanism in which the ArsR family member ArsR3 autoregulates its expression and also modulates Omp25D expression to maintain metal ion homeostasis and virulence in <i>Brucella</i>.</span></p>
Immunogenicity and Reactogenicity of a Meningococcal B Outer Membrane Vesicle Vaccine Given in a 0,6,12 Month Schedule to Health UK Adults
ClinicalTrials.gov study NCT00197795. IPD Sharing: Not stated. Countries: 0. Publications: 1.
Data from: Phylogenomic analysis supports the ancestral presence of LPS-outer membranes in the Firmicutes
Open the record for dataset details and reuse information.
Data from: Evidence for amino acid snorkeling from a high-resolution, in vivo analysis of Fis1 tail anchor insertion at the mitochondrial outer membrane
Open the record for dataset details and reuse information.
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