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Related Concept Videos

Peptidoglycan Synthesis01:28

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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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Protein Folding Quality Check in the RER01:29

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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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Proteoglycans01:05

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Glycans, a class of complex heterogeneous molecules, can be covalently attached to proteins to form glycosylated proteins that regulate various physiological and pathological processes. Glycosylated proteins or glycoproteins comprise N-linked and O-linked oligosaccharides. O-glycosylation is the most common type of protein glycosylation. Here, glycans attach to the oxygen atom of the hydroxyl groups of Serine or Threonine residues. O-linked glycosylation occurs later in protein processing,...
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Recycling Endosomes and Transcytosis00:58

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The recycling endosome, also known as the endosomal recycling compartment (ERC), is a part of the slow-recycling process of the endocytic pathway. Molecules internalized through receptor-mediated endocytosis are either degraded in the lysosomes or are recycled to the plasma membrane through the fast- or slow-recycling route.
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Oligosaccharide Assembly01:24

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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.
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Export of Misfolded Proteins out of the ER01:32

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After folding, the ER assesses the quality of secretory and membrane proteins. The correctly folded proteins are cleared by the calnexin cycle for transport to their final destination, while misfolded proteins are held back in the ER lumen. The ER chaperones attempt to unfold and refold the misfolded proteins but sometimes fail to achieve the correct native conformation. Such terminally misfolded proteins are then exported to the cytosol by ER-associated degradation or ERAD pathway for...
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Updated: Apr 1, 2026

Semi-Quantitative Analysis of Peptidoglycan by Liquid Chromatography Mass Spectrometry and Bioinformatics
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Peptidoglycan Recycling.

Tsuyoshi Uehara, James T Park

    Ecosal Plus
    |October 8, 2015
    PubMed
    Summary
    This summary is machine-generated.

    Escherichia coli recycles peptidoglycan (PG) sacculus components for reuse, with AmpG facilitating uptake of breakdown products. This recycling process, crucial for cell wall synthesis, also has implications for mammalian innate immunity.

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    Area of Science:

    • Microbiology
    • Cell Biology
    • Biochemistry

    Background:

    • Peptidoglycan (PG) recycling is essential for Escherichia coli to reuse sacculus components during cell elongation.
    • Initial studies in 1985 demonstrated significant PG recycling, with cells reusing approximately 45% of their wall diaminopimelic acid (DAP).

    Purpose of the Study:

    • To investigate the mechanisms and significance of peptidoglycan recycling in Escherichia coli.
    • To identify genes and enzymes involved in the recovery of PG degradation products.
    • To explore potential roles of PG recycling components in other organisms, including mammals.

    Main Methods:

    • Labeling of E. coli cells with 3H-diaminopimelic acid (DAP) and subsequent chase experiments.
    • Identification of uptake pathways, primarily the AmpG permease, for PG fragments.
    • Gene identification and ortholog searches across different species.

    Main Results:

    • E. coli efficiently recycles PG, reusing DAP and converting breakdown products like anh-MurNAc for precursor synthesis.
    • The AmpG permease is crucial for uptake of GlcNAc-anhMurNAc with attached peptides.
    • Eleven genes are identified for PG degradation product recovery; their significant investment is noted despite PG being a small fraction of cell mass.
    • Absence of AmpD leads to anh-MurNAc-tripeptide accumulation and beta-lactamase induction.
    • Orthologs of PG recycling machinery, including AmpG, are found in Gram-negative bacteria and mammals.

    Conclusions:

    • Peptidoglycan recycling is a vital process in E. coli, ensuring efficient reuse of cell wall material.
    • The identified genes and enzymes highlight a sophisticated system for salvaging PG fragments.
    • The discovery of mammalian AmpG orthologs suggests a potential role in innate immunity.