Publications associées à Peptidoglycane

Resolving bacterial cell biology: from replisome dynamics to cell wall synthesis

Bacteria are ubiquitous single cellular organisms. Compared to eukaryotic cells, bacteria have two unique characteristics: the membrane-less nucleoid and the cell wall built of peptidoglycan (PG). In most bacteria, a single circular chromosome is compacted ...

EPFL2024

Fluorescent D-Amino Acids for Super-resolution Microscopy of the Bacterial Cell Wall

Suliana Manley, Luc Reymond, Ophélie Rutschmann, Willi Leopold Stepp, Juliette Griffie, Chen Zhang, Jiangtao Qiao, Faustine Ambroisine Charline Ryckebusch

Fluorescent D-amino acids (FDAAs) have previ-ously been developed to enable in situ highlighting of locations of bacterial cell wall growth. Most bacterial cells lie at the edge of the diffraction limit of visible light; thus, resolving the precise details ...

2022

Loss of Bacterial Cell Pole Stabilization in Caulobacter crescentus Sensitizes to Outer Membrane Stress and Peptidoglycan-Directed Antibiotics

Gerardo Turcatti, Marc Chambon, Julien Bortoli Chapalay

Rod-shaped bacteria frequently localize proteins to one or both cellpoles in order to regulate processes such as chromosome replication or polar organ-elle development. However, the roles of polar factors in responses to extracellularstimuli have been gene ...

2020

Structure and Function of the T4 Spackle Protein Gp61.3

Petr Leiman, Alec Fraser

The bacteriophage T4 genome contains two genes that code for proteins with lysozyme activity-e and 5. Gene e encodes the well-known T4 lysozyme (commonly called T4L) that functions to break the peptidoglycan layer late in the infection cycle, which is requ ...

2020

Parietal Structures of Escherichia coli Can Impact the D-Cateslytin Antibacterial Activity

Georg Fantner, Oliver Peric

Bacterial resistance to conventional antibiotics is of major concern. Antimicrobial peptides (AMPs) are considered excellent alternatives. Among them, D-cateslytin (D-Ctl, derivative of a host defense peptide) has shown high efficiency against a broad spec ...

2020

Outer membrane lipoprotein NlpI scaffolds peptidoglycan hydrolases within multi-enzyme complexes in Escherichia coli

Ann-Kristin Hov

The peptidoglycan (PG) sacculus provides bacteria with the mechanical strength to maintain cell shape and resist osmotic stress. Enlargement of the mesh-like sacculus requires the combined activity of peptidoglycan synthases and hydrolases. In Escherichia ...

WILEY2020

Weevil pgrp-lb prevents endosymbiont TCT dissemination and chronic host systemic immune activation

Florent François Masson, João Pedro Alves Da Silva

Long-term intracellular symbiosis (or endosymbiosis) is widely distributed across invertebrates and is recognized as a major driving force in evolution. However, the maintenance of immune homeostasis in organisms chronically infected with mutualistic bacte ...

National Academy of Sciences2019

Maturing Mycobacterium smegmatis peptidoglycan requires non-canonical crosslinks to maintain shape

Georg Fantner, John McKinney, Haig Alexander Eskandarian

In most well-studied rod-shaped bacteria, peptidoglycan is primarily crosslinked by penicillin-binding proteins (PBPs). However, in mycobacteria, crosslinks formed by L,D-transpeptidases (LDTs) are highly abundant. To elucidate the role of these unusual cr ...

ELIFE SCIENCES PUBLICATIONS LTD2018

Microbiota-Derived Lactate Activates Production of Reactive Oxygen Species by the Intestinal NADPH Oxidase Nox and Shortens Drosophila Lifespan

Bruno Lemaitre, Jean Philippe Boquete, Igor Iatsenko

Commensal microbes colonize the gut epithelia of virtually all animals and provide several benefits to their hosts. Changes in commensal populations can lead to dysbiosis, which is associated with numerous pathologies and decreased lifespan. Peptidoglycan ...

2018

Cell-Specific Imd-NF-κB Responses Enable Simultaneous Antibacterial Immunity and Intestinal Epithelial Cell Shedding upon Bacterial Infection

Bruno Lemaitre, Zongzhao Zhai, Jean Philippe Boquete

Intestinal infection triggers potent immune responses to combat pathogens and concomitantly drives epithelial renewal to maintain barrier integrity. Current models propose that epithelial renewal is primarily driven by damage caused by reactive oxygen spec ...

2018

An Amidase_3 domain-containing N-acetylmuramyl-L-alanine amidase is required for mycobacterial cell division

Neeraj Dhar, Ashima Bhaskar, Dong Li

Mycobacteria possess a multi-layered cell wall that requires extensive remodelling during cell division. We investigated the role of an amidase_3 domain-containing N-acetylmuramyl-L-alanine amidase, a peptidoglycan remodelling enzyme implicated in cell div ...

Nature Research2017

Structural studies of Mycobacterium tuberculosis DprE1 interacting with its inhabitors

Stewart Cole, Jérémie Piton, Shi-Yan Caroline Foo

The flavoenzyme DprEl catalyses a crucial step in arabinan production for cell wall biosynthesis in Mycobacterium tuberculosis and is a highly vulnerable drug target. It was first discovered using benzothiazinones (BTZ): exquisitely potent bactericidal age ...

Elsevier Sci Ltd2017

The gram-negative sensing receptor PGRP-LC contributes to grooming induction in Drosophila

Bruno Lemaitre

Behavioral resistance protects insects from microbial infection. However, signals inducing insect hygiene behavior are still relatively unexplored. Our previous study demonstrated that olfactory signals from microbes enhance insect hygiene behavior, and gu ...

Public Library of Science2017

PGRP-SD, an Extracellular Pattern-Recognition Receptor, Enhances Peptidoglycan-Mediated Activation of the Drosophila Imd Pathway

Bruno Lemaitre, Igor Iatsenko

Activation of the innate immune response in Metazoans is initiated through the recognition of microbes by host pattern-recognition receptors. In Drosophila, diaminopimelic acid ( DAP)-containing peptidoglycan from Gram-negative bacteria is detected by the ...

Elsevier2016

The DNA-Uptake Process of Naturally Competent Vibrio cholerae

Melanie Blokesch, Noémie Matthey

The sophisticated DNA-uptake machinery used during natural transformation is still poorly characterized, especially in Gram-negative bacteria where the transforming DNA has to cross two membranes as well as the peptidoglycan layer before entering into the ...

Elsevier2016

A scaffold protein connects type IV pili with the Chp chemosensory system to mediate activation of virulence signaling in Pseudomonas aeruginosa

Alexandre Louis André Persat, Joanne Netter Engel

Type IV pili (TFP) function as mechanosensors to trigger acute virulence programs in Pseudomonas aeruginosa. On surface contact, TFP retraction activates the Chp chemosensory system phosphorelay to upregulate 3', 5'-cyclic monophosphate (cAMP) production a ...

Wiley-Blackwell2016

Quantitative Single-Cell Analysis of Host-Pathogen Interactions

Matthieu Jean-Hubert Delincé

During infection, microbial pathogens encounter phagocytic cells of the host innate immune system, such as macrophages and neutrophils. These encounters typically lead to uptake and killing of the bacteria by the host cell or, conversely, parasitization of ...

EPFL2016

In Vivo Activity of the Benzothiazinones PBTZ169 and BTZ043 against Nocardia brasiliensis

Stewart Cole

Background Mycetoma is a neglected, chronic, and deforming infectious disease caused by fungi and actinomycetes. In Mexico, N. brasiliensis is the predominant etiologic agent. Therapeutic alternatives are necessary because the current drug regimens have se ...

Public Library of Science2015

Rapid Cytolysis of Mycobacterium tuberculosis by Faropenem, an Orally Bioavailable beta-Lactam Antibiotic

John McKinney, Neeraj Dhar, François Signorino-Gelo

Recent clinical studies indicate that meropenem, a beta-lactam antibiotic, is a promising candidate for therapy of drug-resistant tuberculosis. However, meropenem is chemically unstable, requires frequent intravenous injection, and must be combined with a ...

American Society for Microbiology2015

Genetic analysis of the decaprenyl-phospho-D-arabinofuranose pathway in Mycobacterium tuberculosis

Gaëlle Séraphine Kolly

The tuberculosis (TB) epidemic still represents a major global health problem as it kills more than one million people every year. Africa and Asia are arguably the most affected regions due to the dramatic increase of TB cases in HIV-positive patients and ...

EPFL2014