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Hen egg white lysozyme is thermally stable, with a melting point reaching up to 72 °C at pH 5.0. [5] However, lysozyme in human milk loses activity very quickly at that temperature. [6] Hen egg white lysozyme maintains its activity in a large range of pH (6–9). [7] Its isoelectric point is 11.35. [8]
A raw U.S. large egg contains around 33 grams of egg white with 3.6 grams of protein, 0.24 grams of carbohydrate and 55 milligrams of sodium. It contains no cholesterol and the energy content is about 17 calories. [3] Egg white is an alkaline solution and contains around 149 proteins.
Lysozyme type C and alpha-lactalbumin are similar both in terms of primary sequence and structure, and probably evolved from a common ancestral protein. [12] Around 35 to 40% of the residues are conserved in both proteins as well as the positions of the four disulphide bonds. There is, however, no similarity in function.
The mechanism is illustrated below for hen egg white lysozyme. [ 15 ] An alternative mechanism for hydrolysis with retention of stereochemistry can occur that proceeds through a nucleophilic residue that is bound to the substrate, rather than being attached to the enzyme.
The immunoglobulin superfamily (IgSF) is a large protein superfamily of cell surface and soluble proteins that are involved in the recognition, binding, or adhesion processes of cells.
Many species of bacteria are subject to lysis by the enzyme lysozyme, found in animal saliva, egg white, and other secretions. [1] Phage lytic enzymes produced during bacteriophage infection are responsible for the ability of these viruses to lyse bacterial cells. [2]
Heart disease is the No. 1 cause of death in the U.S. Yet, according to the American Heart Association, half of Americans are unaware of this sobering statistic. The good news is that a diet ...
An "ensemble" of 44 crystal structures of hen egg white lysozyme from the Protein Data Bank, showing that different crystallization conditions lead to different conformations for various surface-exposed loops and termini (red arrows).