Lysozyme
Lysozyme - Related Videos
08:56
Synthesis of 1,2-Azaborines and the Preparation of Their Protein Complexes with T4 Lysozyme Mutants
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2017
A protocol for the synthesis of 1,2-azaborines and the preparation of their protein complexes with T4 lysozyme mutants is presented.
13:59
Methods to Identify the NMR Resonances of the 13C-Dimethyl N-terminal Amine on Reductively Methylated Proteins
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Cited by 4 •
2013
Two methods for assigning the α- and ε-dimethylamine nuclear magnetic resonance signals of a reductively 13C-methylated N-terminal lysine are described. One method utilizes the pH-induced selectivity of the reductive methylation reaction, and the other uses aminopeptidase to selectively remove the N-terminal lysine.
03:13
Generating Protoplasts from the Gram-Positive Bacterium Bacillus megaterium
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2025
Source: Figueroa, D. M., et al. Production and Visualization of Bacterial Spheroplasts and Protoplasts to Characterize Antimicrobial Peptide Localization. J. Vis. Exp. (2018)This video demonstrates a step-by-step procedure for generating protoplasts from the Gram-positive bacterium Bacillus megaterium.
04:11
Isolation of Endospores from an Environmental Sample by Targeted Lysis of Vegetative Cells
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2025
Source: Wunderlin, T., et al. Physical Isolation of Endospores from Environmental Samples by Targeted Lysis of Vegetative Cells. J. Vis. Exp. (2016)This video demonstrates a method to isolate endospores from an environmental sample containing both vegetative cells and various bacteria. The procedure involves filtration, mechanical disruption, and selective chemical treatment to weaken and lyse vegetative cells while preserving endospores. The final step isolates the resilient endospores through...
07:39
Protein Crystallization
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2023
Protein crystallization, obtaining a solid lattice of biomolecules, elucidates protein structure and enables the study of protein function. Crystallization involves drying purified protein under a combination of many factors, including pH, temperature, ionic strength, and protein concentration. Once crystals are obtained, the protein structure can be elucidated by x-ray diffraction and computation of an electron density model. This video introduces protein crystallization and shows a general...
FAQs
The enzyme’s specificity comes from its ability to hydrolyze the β(1→4) linkages joining N-acetylmuramic acid to N-acetylglucosamine. These sugars are components of bacterial peptidoglycan, so cleavage directly disrupts a structural polymer rather than broadly damaging every cellular molecule. That molecular selectivity explains why lysozyme is relevant to bacterial cell-wall integrity and antimicrobial defense.
Peptidoglycan helps bacterial cells withstand osmotic pressure. When lysozyme breaks the connections within this wall material, the cell becomes structurally weakened and less able to maintain its boundary. Osmotic pressure can then drive lysis, meaning the compromised bacterium ruptures. The outcome depends on bacterial susceptibility, linking wall composition to the effectiveness of this antimicrobial mechanism.
These secretions place lysozyme at interfaces where organisms encounter their surroundings and potential microbes. Its presence contributes to innate immunity, the immediate protective system that does not require prior exposure to a particular microorganism. This distribution shows that lysozyme functions as part of localized biological defense rather than acting only within specialized immune cells.
Egg white contains abundant lysozyme, where it supports antimicrobial defense. This example extends the biological context beyond secretions such as tears and saliva and shows that lysozyme can protect a nutrient-rich biological environment. Its abundance also makes egg white an important source for considering how antimicrobial molecules help limit bacterial threats in organisms.
In laboratory protein extraction, lysozyme is used to disrupt bacterial cells by attacking their peptidoglycan. This releases cellular contents that would otherwise remain enclosed by the bacterial wall, supporting subsequent study of proteins. The method is therefore useful when researchers need access to intracellular material while investigating bacterial components or cellular structure.
Lysozyme assists DNA preparation by weakening the bacterial cell wall before the cell’s contents are analyzed or recovered. Because its target is peptidoglycan, the enzyme addresses a structural barrier that can limit access to intracellular DNA. This application connects lysozyme’s antimicrobial mechanism with a practical laboratory need: opening bacterial cells for molecular studies.
Lysozyme provides a direct link between bacterial cell-wall structure and biological defense. Researchers can examine how a host-associated antimicrobial factor affects susceptible bacteria, while laboratory cell-disruption applications provide access to bacterial proteins or DNA for further analysis. Together, these uses support studies of innate immunity, bacterial structure, and the interaction between microbial surfaces and host defenses.