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Description_x000D_
General description_x000D_
Lysozyme is abundantly found in animal and plant kingdoms. It is a natural food preservative and also found to be present in specific bacterial cell walls. Lysozyme is usually present in tears, milk, urine and saliva._x000D_
Application_x000D_
Lysozyme from chicken egg white has been used:_x000D_
• in dielectric spectroscopy studies of dynamics of protein_x000D_
• as a control to measure the human lysozyme activity_x000D_
• as a supplement in soaking solution to treat lenses_x000D_
Enzyme breaks down the cell walls of bacteria; used to prepare spheroplasts._x000D_
Packaging_x000D_
1, 5 g in poly bottle_x000D_
500 mg in poly bottle_x000D_
Biochem/physiol Actions_x000D_
Lysozyme hydrolyzes β(1→4) linkages between N-acetylmuramic acid and N-acetyl-D-glucosamine residues in peptidoglycan and between N-acetyl-D-glucosamine residues in chitodextrin. Gram-positive cells are quite susceptible to this hydrolysis as their cell walls have a high proportion of peptidoglycan. Gram-negative bacteria are less susceptible due to the presence of an outer membrane and a lower proportion of peptidoglycan. However, these cells may be hydrolyzed in the presence of EDTA that chelates metal ions in the outer bacterial membrane._x000D_
The enzyme is active over a broad pH range (6.0 to 9.0). At pH 6.2, maximal activity is observed over a wider range of ionic strengths (0.02 to 0.100 M) than at pH 9.2 (0.01 to 0.06 M)._x000D_
Lysozymes participate in the defense mechanism. It has the ability to stimulate catalysis by bringing steric stress in the substrates._x000D_
Features and Benefits_x000D_
• Highly purified by repeated crystallization and dialysis_x000D_
• Each lot is use-tested for isolation of plasmid DNA from E. coli_x000D_
Unit Definition_x000D_
One unit will produce a ΔA450 of 0.001 per min at pH 6.24 at 25°C, using a suspension of Micrococcus lysodeikticus as substrate, in a 2.6 mL reaction mixture (1 cm light path)._x000D_
Preparation Note_x000D_
3× crystallized
- Related Categories 3.2.x.x Glycosidases, 3.x.x.x Hydrolases, Biochemicals and Reagents, Enzyme Class Index, Enzymes, Inhibitors, and SubstratesMore... Quality Level