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Lysozyme (EC 3.2.1.17, muramidase, N-acetylmuramide glycanhydrolase; systematic name peptidoglycan N-acetylmuramoylhydrolase) is an antimicrobial enzyme produced by animals that forms part of the innate immune system. It is a glycoside hydrolase that catalyzes the following process:
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).
Peptidoglycan-N-acetylglucosamine deacetylase (EC 3.5.1.104, HP310, PgdA, SpPgdA, BC1960, peptidoglycan deacetylase, N-acetylglucosamine deacetylase, peptidoglycan GlcNAc deacetylase, peptidoglycan N-acetylglucosamine deacetylase, PG N-deacetylase) is an enzyme with systematic name peptidoglycan-N-acetylglucosamine amidohydrolase.
The first PGRP was discovered in 1996 by Masaaki Ashida and coworkers, who purified a 19 kDa protein present in the hemolymph and cuticle of a silkworm (Bombyx mori), and named it Peptidoglycan Recognition Protein, because it specifically bound peptidoglycan and activated the prophenoloxidase cascade. [5]
Scientists have used a food coloring dye used in Doritos and other products to create mice with see-through skin, a low-cost way to assess the body's internal operations.
Location of human PGLYRP3 gene on chromosome 1 and schematic gene, cDNA, and protein structures with exons, introns, and protein domains indicated.. Peptidoglycan recognition protein 3 (PGLYRP3, formerly PGRP-Iα) is an antibacterial and anti-inflammatory innate immunity protein that in humans is encoded by the PGLYRP3 gene.
Gram-positive cells have a thick layer of peptidoglycan in the cell wall that retains the primary stain, crystal violet. Gram-negative cells have a thinner peptidoglycan layer that allows the crystal violet to wash out on addition of ethanol. They are stained pink or red by the counterstain, [3] commonly safranin or fuchsine.
Peptidoglycan binding domains have a general peptidoglycan binding function and a common core structure consisting of a closed, three-helical bundle with a left-handed twist. It is found at the N or C terminus of a variety of enzymes involved in bacterial cell wall degradation.
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