Lysozyme
An enyme that was first identified and named Fleming, who recognized its bacteriolytic pr been designated muramidase, since it is know to facilitate the hydrolysis of a  b-1-4-g1ycosidic bond between N-acetylglucosamine and N-acetylmuramic acid in bacterial cell walls; it also hydrolyzes similar glycosidic bonds in fragments of chitin. In recognition of this enzyme function, the international Enzyme Commission assigned chemical name of N-acetylmurainide glycanohydrolyase, coded as 3.2.1.17.

The most detailed studies have been performed on hen egg-white lysozyme, because this product is readily available.

Amino acid sequence
The complete amino acid sequence of hen egg determined independently by P. Jolles and by R.E. Canfield with their respective coworkers. The molecule consists of a single polypeptide chain containing 129 amino acid residues.
The complete structure is illustrated in Fig.1. This was determined by a technique which involved splitting the reduced alkylated lysozyme molecule into small peptide fragments with the proteolytic enzymes trypsin, chymotrypsin, and pepsin. The precise sequence of amino acid in each of the isolated fragments was then determined by the Edman degradation technique.

Inouye and A. Tsugita reported the amion acid sequence of a lysozyme synthesized by T4 bacteriophage that  facilitates the peneterial of phage deoxyribonucleic acid (DNA)  through the bacterial cell wall. The protein is a single polypeptide chain containing 160 amino acid residues and no cysteine bridges.

Lytic
A phase of the virus life cycle during which the virus replicates within the host cell, releasing a new generation of viruses when the infected cell lyses.

Lytic cycle
The steps in viral production that usually lead to cell lysis.