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02
Feb
Lysozyme: Structure, Antimicrobial Mechanisms and Applications
Exploring the vital role of "Nature's Antibiotic" in the innate immune system and its versatile industrial uses.
Lysozyme is a naturally occurring antimicrobial enzyme widely distributed in living organisms. As a critical component of the innate immune system, it exerts bacteriolytic activity primarily through the hydrolysis of peptidoglycan, leading to osmotic lysis and cell death.
I. Core Mechanisms of Action
Cell Wall Hydrolysis
Lysozyme cleaves the Îē-1,4-glycosidic bond between NAM and NAG. This causes an osmotic imbalance, particularly effective against Gram-positive pathogens like Staphylococcus.
Immunomodulation
It interacts with viral proteins for inactivation and enhances macrophage phagocytic activity, amplifying both innate and adaptive immune responses.
II. Sources and Biological Distribution
- ð§ Human: Tears, Saliva, Breast Milk
- ðĨ Animal: Chicken Egg White (Primary Source)
- ðą Plants: Specific microbial and plant tissues
Molecular Profile: 129 amino acids (~14.4 kDa). It boasts extreme thermal stability, retaining activity at 100°C within a pH range of 4â7.
III. Major Application Areas
| Sector | Primary Uses |
|---|---|
| Medical | Treatment of oral ulcers, rhinitis, and gastrointestinal inflammation. Synergistic with antibiotics. |
| Food Industry | Natural preservative for dairy and meat; promotes beneficial gut bacteria (Bifidobacterium) in infants. |
| Personal Care | Bio-preservative in toothpastes and mouthwash to prevent gingivitis. |
IV. Safety Profile and Advantages
As a naturally derived protein, lysozyme offers a high safety profile with low toxicity and minimal irritation. It represents a superior alternative to synthetic chemicals, providing a broad antimicrobial spectrum with a low propensity for bacterial resistance.
Biofargo team
