L4919

Lysozyme from chicken egg white

BioUltra, lyophilized powder, ≥98% (SDS-PAGE), ≥40,000 units/mg protein

• Synonym(s): Mucopeptide N-acetylmuramoylhydrolase, Muramidase
• CAS Number: 12650-88-3
• Enzyme Commission number: 3.2.1.17 (BRENDA, IUBMB)
• EC Number: 235-747-3
• MDL number: MFCD00131557
• UNSPSC Code: 12352204
• NACRES: NA.54

Properties

• biological source: chicken egg white
• grade: for molecular biology
• product line: BioUltra
• assay: ≥98% (SDS-PAGE)
• form: lyophilized powder
• specific activity: ≥40,000 units/mg protein
• mol wt: single-chain 14.3 kDa
• composition: Protein, ≥90%
• technique(s): cell based assay: suitable
• suitability: suitable for cell lysis
• application(s): cell analysis
• storage temp.: −20°C

Description

General description

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.

Application

Lysozyme from chicken egg white has been used:

• in dielectric spectroscopy studies of dynamics of protein
• as a control to measure the human lysozyme activity
• as a supplement in soaking solution to treat lenses

Enzyme breaks down the cell walls of bacteria; used to prepare spheroplasts.

Biochem/physiol Actions

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.

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).

Lysozymes participate in the defense mechanism. It has the ability to stimulate catalysis by bringing steric stress in the substrates.

Features and Benefits

• Highly purified by repeated crystallization and dialysis
• Each lot is use-tested for isolation of plasmid DNA from E. coli

Unit Definition

One unit will lyse 0.6 μg of Micrococcus lysodeikticus per minute by turbidimetric detection at 600 nm when suspended in buffer at pH 6.2 at 25 °C.

Preparation Note

3× crystallized

Safety Information

• pictograms: GHS08
• signalword: Danger
• hcodes: H334
• pcodes: P261 - P284 - P501
• Hazard Classifications: Resp. Sens. 1
• Storage Class: 11 - Combustible Solids
• wgk_germany: WGK 3
• flash_point_f: Not applicable
• flash_point_c: Not applicable
• ppe: Eyeshields, Gloves, type N95 (US)