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Related Concept Videos

Peptidoglycan Synthesis01:28

Peptidoglycan Synthesis

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Structure of PeptidoglycanPeptidoglycan is a vital structural component of the bacterial cell wall, providing mechanical strength and shape to the cell. It consists of repeating units of two sugars—N-acetylglucosamine (NAG) and N-acetylmuramic acid (NAM)—linked by β-1,4 glycosidic bonds. These sugar chains are cross-linked by short peptide chains, forming a mesh-like polymer that surrounds the bacterial plasma membrane.Cytoplasmic Phase – Precursor SynthesisPeptidoglycan...
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Bacterial Protein Maturation01:26

Bacterial Protein Maturation

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Bacterial protein maturation is a tightly regulated process that ensures newly synthesized polypeptides achieve correct functional conformations. This maturation involves a series of modifications, folding events, and quality control steps, often assisted by specialized chaperone proteins.N-Terminal ModificationsThe maturation of bacterial polypeptides begins cotranslationally as the polypeptide exits the ribosome. The first amino acid, N-formylmethionine (fMet), is typically modified at the...
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Formation of Lipopolysaccharides01:19

Formation of Lipopolysaccharides

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Lipopolysaccharides (LPS) are crucial components of the outer membrane of Gram-negative bacteria, serving both structural and functional roles. It contributes to membrane stability and protects bacteria from host immune responses. LPS is composed of three major regions—lipid A, a core oligosaccharide, and an O antigen. The biosynthesis and assembly of LPS involve a highly coordinated set of enzymatic reactions and transport mechanisms. Additionally, LPS is recognized as an endotoxin,...
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Oligosaccharide Assembly01:24

Oligosaccharide Assembly

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Protein glycosylation starts in the ER lumen and continues in the Golgi apparatus. Glycosyltransferases catalyze the addition of sugar molecules or glycosylation of proteins. Usually, these enzymes add sugars to the hydroxyl groups of selected serine or threonine residues to form O-linked glycans or the amino groups of asparagine residues to form N-linked glycans. Different positions on the same polypeptide chain can contain differently linked glycans.
Multiple sugar molecules that may or may...
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Protein Folding Quality Check in the RER01:29

Protein Folding Quality Check in the RER

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ER is the primary site for the maturation and folding of soluble and transmembrane secretory proteins. The calnexin cycle is a specific chaperone system that folds and assesses the confirmation of N-glycosylated proteins before they can exit the ER lumen. The primary players of this quality check pipeline are the lectins, ER-resident chaperones, and a glucosyl transferase enzyme. In case the calnexin system in the lumen fails to salvage a misfolded protein, it is transported to the cytoplasm...
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Protein Transport to the Outer Chloroplast Membrane01:11

Protein Transport to the Outer Chloroplast Membrane

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Chloroplast outer membrane proteins encoded by the nucleus are synthesized in the cytosol. Soon after synthesis, they bind cytosolic factors such as 14-3-3 protein and the Hsp70 chaperones that keep these precursors in an unfolded state until their translocation.
Two models describe the mechanism of precursor recognition and entry across the outer membrane through the TOC complex. Model 1 suggests the newly synthesized precursor binds to the TOC receptor 159 and forms a complex.
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Related Experiment Video

Updated: Sep 8, 2025

Directed Protein Packaging within Outer Membrane Vesicles from Escherichia coli: Design, Production and Purification
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Directed Protein Packaging within Outer Membrane Vesicles from Escherichia coli: Design, Production and Purification

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Peptidoglycan maturation controls outer membrane protein assembly.

Gideon Mamou1, Federico Corona2,3, Ruth Cohen-Khait1

  • 1Department of Biochemistry, South Parks Road, University of Oxford, Oxford, UK.

Nature
|June 15, 2022
PubMed
Summary
This summary is machine-generated.

Peptidoglycan structure in Gram-negative bacteria guides outer membrane protein (OMP) insertion. Mature peptidoglycan limits OMP insertion, ensuring OMPs are preferentially inserted at division sites during cell growth.

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Separation of the Cell Envelope for Gram-negative Bacteria into Inner and Outer Membrane Fractions with Technical Adjustments for Acinetobacter baumannii
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Separation of the Cell Envelope for Gram-negative Bacteria into Inner and Outer Membrane Fractions with Technical Adjustments for Acinetobacter baumannii
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Area of Science:

  • Microbiology
  • Cell Biology
  • Biochemistry

Background:

  • Outer membrane proteins (OMPs) are essential for Gram-negative bacterial outer membrane function and integrity.
  • The β-barrel assembly machine (BAM) complex is responsible for inserting OMPs into the outer membrane.
  • The mechanism behind the observed polar segregation of OMPs in growing Escherichia coli remains unclear.

Purpose of the Study:

  • To investigate the role of peptidoglycan in the spatiotemporal organization of outer membrane proteins (OMPs) in Gram-negative bacteria.
  • To elucidate how peptidoglycan maturation influences OMP biogenesis and insertion.
  • To understand the basis of OMP binary partitioning during cell division.

Main Methods:

  • Investigated the interaction between peptidoglycan and BAM components using biochemical assays.
  • Assessed the effect of different peptidoglycan maturation states on OMP foldase activity.
  • Utilized microscopy and genetic approaches to track OMP localization and insertion during cell division.

Main Results:

  • Mature peptidoglycan binds to BAM components and inhibits OMP foldase activity.
  • Nascent peptidoglycan, found at septa, interacts weakly with BAM and exhibits minimal inhibitory effect.
  • This differential interaction leads to the preferential insertion of new OMPs at cell division sites, explaining binary partitioning.

Conclusions:

  • Peptidoglycan maturation is a key regulator of outer membrane protein biogenesis and localization in Gram-negative bacteria.
  • The coordination between cell wall synthesis and OMP insertion ensures proper cell envelope assembly and integrity.
  • This regulatory mechanism represents a potential target for novel antibiotic development.