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Peptidoglycan. The peptidoglycan layer within the bacterial cell wall is a crystal lattice structure formed from linear chains of two alternating amino sugars, namely N-acetylglucosamine (GlcNAc or NAG) and N-acetylmuramic acid (MurNAc or NAM).
Human, [18] [58] mouse, [57] and porcine [74] PGLYRP2 are enzymes, N-acetylmuramoyl-L-alanine amidases, that hydrolyze the amide bond between the MurNAc and L-alanine, the first amino acid in the stem peptide in bacterial cell wall peptidoglycan. The minimal peptidoglycan fragment hydrolyzed by PGLYRP2 is MurNAc-tripeptide. [58]
Location of human PGLYRP1 gene on chromosome 19 and schematic gene, cDNA, and protein structures with exons, introns, and protein domains indicated. Peptidoglycan recognition protein 1, PGLYRP1, also known as TAG7, is an antibacterial and pro-inflammatory innate immunity protein that in humans is encoded by the PGLYRP1 gene. [5] [6] [7] [8]
Simplistic schematic representation of endolysins cleaving the peptidoglycan layer of a Gram-positive bacterial cell wall. As endolysins degrade the peptidoglycan layer, the high internal pressure within the cell can no longer be maintained, resulting in cell lysis. Enzybiotics are an experimental antibacterial therapy. [1]
In humans, the C-type lysozyme enzyme is encoded by the LYZ gene. [3] [4] Hen egg white lysozyme is thermally stable, with a melting point reaching up to 72 °C at pH 5.0. [5] However, lysozyme in human milk loses activity very quickly at that temperature. [6] Hen egg white lysozyme maintains its activity in a large range of pH (6–9). [7]
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Glycopeptide antibiotics are a class of drugs of microbial origin that are composed of glycosylated cyclic or polycyclic nonribosomal peptides.Significant glycopeptide antibiotics include the anti-infective antibiotics vancomycin, teicoplanin, telavancin, ramoplanin, avoparcin and decaplanin, corbomycin, complestatin and the antitumor antibiotic bleomycin.
In an animal study, researchers found that mice given a drug to inhibit a protein associated with aging lived nearly 25% longer and were less likely to develop cancer than mice in the control group.
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