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L3790 Sigma

Lysozyme from chicken egg white

10 mg/mL

Synonym: Mucopeptide N-acetylmuramoylhydrolase, Muramidase



Related Categories 3.2.x.x Glycosidases, 3.x.x.x Hydrolases, Biochemicals and Reagents, Enzyme Class Index, Enzymes, Inhibitors, and Substrates,
form   (Ready to use solution:10 mg/mL lysozyme in 25 mM sodium acetate pH 4.5 with 50% glycerol.)
shelf life   2 yr at -20 °C
mol wt   single-chain mol wt 14.3 kDa
concentration   10 mg/mL
shipped in   wet ice
storage temp.   −20°C
Gene Information   chicken ... LYZ(396218)



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

Suitable for the purification of both DNA and protein from bacteria.

Physical form

Solution in 50% glycerol, 25 mM Sodium Acetate

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).

General description

Lysosyme is an enzyme found in egg white that breaks down the cell walls in bacteria enhancing the efficiency of DNA and protein extraction.


Tested for suitability with CelLytic B in protein extraction from bacteria.

Legal Information

CelLytic is a trademark of Sigma-Aldrich Co. LLC

Price and Availability

Biomedical Applications
Safety & Documentation

Safety Information

NONH for all modes of transport
WGK Germany 


Certificate of Analysis

Certificate of Origin

Protocols & Articles


Lysozyme Solution Product Information

EC Number: CAS #: 12650-88-3 Synonyms: Muramidase, Peptidoglycan N-acetylmuramoylhydrolase E1%281.5 nm: 26.4 in 0.1 M KCl1 EmM (280 nm): 362 Isoelectric Point (pI): 11.353 Optimum pH: 9.22
Keywords: Cell disruption, Purification


Enzymatic Assay of Lysozyme (EC

This procedure may be used for Lysozyme products. The enzymatic rate determination (A450, Light path = 1 cm) is based on the following reaction:

Selecting Correctly Expressing Recombinants

Blue / White colony screening is a strategy to quickly and easily distinguish between recombinant and non-recombinant colonies. It requires a special vector and a special strain of E. coli. It is par...
Keywords: AGE, Amplification, Antibiotics, Cell disruption, Centrifugation, Cloning, Degradations, Detergents, Diagnostic, Digestions, Electrophoresis, Gel electrophoresis, Molecular biology, Peptide synthesis, Phase transitions, Polymerase chain reaction, Precipitation, Purification, Sequencing, Transfection, transformation

Related Content

Enzymes & Proteins

Application Index | Enzyme Index | Substrate Index | Inhibitor Index | Cofactor Index | Lectin Index
Keywords: Cell signaling, Diagnostic, Drug discovery, Molecular biology

Peer-Reviewed Papers


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